Time: 2026/10/13 Tuesday at 5:00 pm
Speaker: 홍종원(인하대)
Title: Changes in Taste Neurons Support the Emergence of an Adaptive Behavior in Cockroaches
Ref: https://www.science.org/doi/10.1126/science.1234854
Time: 2026/09/29 Tuesday at 5:00 pm
Speaker: 김정호 (Univ. Rovira i Virgili)
Title: From kill the winner to eliminate the winner in open phage-bacteria systems
Ref: https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1010400
Time: 2026/09/15 Tuesday at 5:00 pm
Speaker: 손강민(고등과학원)
Title: Generalized Lotka-Volterra Model on Sparse Graphs
Ref: https://journals.aps.org/prxlife/abstract/10.1103/8hrf-twxb https://www.scipost.org/SciPostPhys.21.1.008
Time: 2026/06/29 Monday at 3:00 pm
Speaker: 이나현 (세종대)
Title: Conditions for the Establishment of Creole Languages from an Evolutionary Game-Theoretic Perspective
Ref: https://www.sciencedirect.com/science/article/pii/S0022519325000566
Time: 2026/06/22 Monday at 3:00 pm
Speaker: 채선희 (인하대)
Title: Reconciling ecology and evolutionary game theory or “When not to think cooperation”
Ref: https://www.pnas.org/doi/10.1073/pnas.2413847122
Time: 2026/06/08 Monday at 3:00 pm
Speaker: 박종민 (APCTP)
Title: Evolution of noisy learning in games
Ref: https://www.pnas.org/doi/10.1073/pnas.2529959123
Time: 2026/05/18 Monday at 3:00 pm
Speaker: 이해성 (인하대)
Title: Evolution of species’ range and niche in changing environments
Ref: https://www.pnas.org/doi/10.1073/pnas.2604510123
Time: 2026/05/11 Monday at 3:00 pm
Speaker: 박혜진 (인하대)
Title: Cross-feeding enables robust coexistence between four bacterial species
Refs: https://www.biorxiv.org/content/10.64898/2026.04.20.719729v1
Time: 2026/04/27 Monday at 3:00 pm
Speaker: 최지범 (KIAS)
Title: Model selection for elucidating evolution of aposematism
Ref: https://www.science.org/doi/abs/10.1126/science.ade5156
Time: 2026/04/13 Monday at 3:00 pm
Speaker: 허재석 (KAIST)
Title: Timeliness criticality in complex systems
Ref: https://doi.org/10.1038/s41567-024-02525-w
Time: 2026/03/30 Monday at 3:00 pm
Speaker: 권의준 (KIAS)
Title: A theory of ecological invasions and its implications for eco-evolutionary dynamics
Ref: https://www.pnas.org/doi/10.1073/pnas.2505850122
Time: 2026/03/16 Monday at 3:00 pm
Speaker: 이상훈 (경상국립대)
Title: Graphs are maximally expressive for higher-order interactions
Other Refs: https://arxiv.org/abs/2601.05169
Time: 2025/12/12 Friday at 1:00 pm
Speaker: 이나현 (세종대)
Title: The evolution of private reputations in information-abundant landscapes
Ref: https://www.nature.com/articles/s41586-024-07977-x
Time: 2025/12/05 Friday at 1:00 pm
Speaker: 채선희 (인하대)
Title: Migration based on environment comparison promotes cooperation in evolutionary games
Ref: https://www.sciencedirect.com/science/article/pii/S0378437122001224
Time: 2025/11/28 Friday at 1:00 pm
Speaker: 박종민 (APCTP)
Title: Thermodynamic selection: The role of entropy waste elimination in evolution
Title: https://journals.aps.org/pre/abstract/10.1103/vzwb-1fp3
Time: 2025/10/31 Friday at 1:00 pm
Speaker: 이해성 (인하대)
Title: Coevolution of Synchronization and Cooperation in Costly Networked Interactions
Ref: https://doi.org/10.1103/PhysRevLett.118.238301
Time: 2025/09/26 Friday at 1:00 pm
Speaker: 박혜진 (인하대)
Title: Evolution of cooperation on temporal networks
Ref: https://www.nature.com/articles/s41467-020-16088-w
Time: 2025/09/19 Friday at 1:00 pm
Speaker: 최지범 (KIAS)
Title: Handshake-dependent RPS-like game for bacterial toxin transfer
Ref: https://www.nature.com/articles/s41540-025-00541-x
Abstract: Myxobacteria produce a wide array of toxins alongside their cognate immunity proteins. When two myxobacterial cells possess compatible surface receptors, they engage in outer membrane exchange, during which their toxin repertoires are bidirectionally transferred. This process can lead to cellular damage if a recipient lacks immunity to incoming toxins. Thus, receptor compatibility serves as a prerequisite for intercellular interactions. Given that molecular transfer occurs under this compatibility constraint, the composition of each cell's toxin and immunity repertoire gives rise to a rock-paper-scissors (RPS)-like competitive dynamic. To capture the complexity of these interactions, I propose the concept of a handshake-dependent RPS-like game, where the "handshake" represents receptor compatibility, and the RPS-like competition emerges from the bidirectional toxin transfer. This framework provides a mechanistic explanation for the extensive toxin diversity observed in natural myxobacterial populations, thereby offering a resolution to Crozier's paradox.
Time: 2025/06/30 Monday at 1:00 pm
Speaker: 이나현 (세종대)
Title: Individual- and group-level sex ratios under local mate competition: consequences of infanticide and reproductive dominance
Ref: https://academic.oup.com/evlett/article/7/1/13/7032235?login=true
Time: 2025/06/16 Monday at 10:00 am
Speaker: 권의준 (서울대)
Title: Evolutionary Innovation by Polyploidy
Ref: PRX Life 2, 043021 (2024)
Time: 2025/05/30 Friday at 1:00 pm
Speaker: 박종민 (APCTP)
Title: Critical habitat size of organisms diffusing with stochastic resetting
Ref: https://arxiv.org/abs/2505.03727
Time: 2025/05/23 Friday at 1:00 pm
Speaker: 이상훈 (경상국립대)
Title: Cross-feeding creates tipping points in microbiome diversity
Ref: https://www.pnas.org/doi/full/10.1073/pnas.2425603122
Time: 2025/05/12 Monday at 4:00 pm
Speaker: Kiseok Lee (The University of Chicago)
Title: Functional regimes define the response of the soil microbiome to environmental change
Ref: https://www.biorxiv.org/content/10.1101/2024.03.15.584851v3
Abstract: The metabolic activity of soil microbiomes plays a central role in global nutrient cycles. Understanding how soil metabolic activity responds to climate-driven environmental perturbations is a key challenge. However, the ecological, spatial, and chemical complexity of soils complicates understanding how these communities respond to perturbations. Here, we address this complexity by combining dynamic measurements of respiratory nitrate metabolism with modeling to reveal functional regimes that define soil responses to environmental change. Measurements on >1500 soil microcosms subjected to pH perturbations reveal regimes where a few key mechanisms govern the response of soils to perturbations. A minimal mathematical model with two parameters, the quantity of biomass activity and the available growth-limiting nutrients, predicts nitrate utilization dynamics across soils and pH perturbations. Changes in model parameters under perturbations reveal three functional regimes with distinct proposed mechanisms: an acidic regime causing cell death and reduced metabolism, a nutrient-limited regime where dominant taxa utilize soil matrix-released nutrients, and a resurgent growth regime where rare taxa grow exponentially with excess nutrients. The model-proposed mechanisms governing each regime are validated through amendment experiments, nutrient measurements, sequencing, and experiments with isolates. Experiments and meta-analyses suggest functional regimes are prevalent in soils exposed to pH perturbations.
Time: 2025/05/02 Friday at 1:00 pm
Speaker: 박혜진 (인하대)
Title: How spatiotemporal dynamics can enhance ecosystem resilience
Ref: https://www.pnas.org/doi/abs/10.1073/pnas.2412522122?af=R
Time: 2025/04/11 Friday at 1:00 pm
Speaker: 채선희 (인하대)
Title: Personalised strategy of allocating social goods in structured populations
Ref: https://arxiv.org/abs/2503.05074
Time: 2025/03/28 Friday at 1:00 pm
Speaker: 이해성 (인하대)
Title: Evolution of Reproduction Periods in Seasonal Environments
Ref: https://www.journals.uchicago.edu/doi/10.1086/708274
Time: 2025/02/25 Tuesday at 5:00 pm
Speaker: Yuriy Pichugin (MPI for Evolutionary Biology)
Title: Evolution of informed dispersal in trophic meta-communities
Abstract: Living organisms move and their movement strategies are subjected to evolution. At the same time, these strategies also shape what environment (and selective pressure) is experienced by organisms, thus, forming an eco-evolutionary feedback loop. In the present work, we study the evolution of informed dispersal strategies of a consumer species in a two-species (a consumer and a resource) meta-community. We sample a range of ecological conditions and find the optimal dispersal strategies, the emerging population dynamics, and assess the resulting viability of a species. We contrast our findings with the classical predictions of the marginal value theorem (MVT) and show that evolved strategies can be grouped into four classes, qualitatively different in the shape of the decision function, the character of the population dynamics, and ecological conditions favoring them. Only one of these strategy classes complies with MVT predictions, while the three others deviate from them in different aspects. Our work shows a rich emergent eco-evolutionary dynamics of dispersal and at the same time establishes a connection with classical results about evolution of movement strategies in the context of trophic meta-communities.
Time: 2024/12/18 Wednesday at 5:00 pm
Speaker: 박종민 (APCTP)
Title: Generalized Lotka-Volterra Systems with Time Correlated Stochastic Interactions
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.167101
Time: 2024/12/11 Wednesday at 5:00 pm
Speaker: 이현우 (인하대)
Title: Intraspecific predator interference promotes biodiversity in ecosystems
Ref: https://elifesciences.org/articles/93115
Time: 2024/12/04 Wednesday at 5:00 pm
Speaker: 이나현 (세종대)
Title: The Trivers–Willard hypothesis: sex ratio or investment?
Ref: https://royalsocietypublishing.org/doi/full/10.1098/rspb.2016.0126
Time: 2024/11/13 Wednesday at 5:00 pm
Speaker: 권의준 (서울대)
Title: Frequency-Dependent Ecological Interactions Increase the Prevalence, and Shape the Distribution, of Preexisting Drug Resistance
Ref: https://journals.aps.org/prxlife/abstract/10.1103/PRXLife.2.023010
Time: 2024/10/16 Wednesday at 4:00 pm
Speaker: 이상훈 (경상국립대)
Title: The evolution of private reputations in information-abundant landscapes
Ref: https://www.nature.com/articles/s41586-024-07977-x
Time: 2024/10/02 Wednesday at 5:00 pm
Speaker: 박혜진 (인하대)
Title: The Hitchhiker’s Guide to Adaptive Dynamics
Ref: https://www.mdpi.com/2073-4336/4/3/304
Time: 2024/09/11 Wednesday at 5:00 pm
Speaker: 최지범 (경희대)
Title: Stochastic State Transitions Give Rise to Phenotypic Equilibrium in Populations of Cancer Cells
Ref: https://www.cell.com/fulltext/S0092-8674(11)00824-5
Time: 2024/07/15 Monday at 1:30 pm
Speaker: 백승기 (부경대)
Title: Stochastic competitive release and adaptive chemotherapy
Ref: https://doi.org/10.1103/PhysRevE.108.034407
Time: 2024/07/11 Thursday at 1:30 pm
Speaker: 이현우 (인하대)
Title: Enhanced production of heterologous proteins by a synthetic microbial community: Conditions and trade-offs
Ref: https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1007795
Time: 2024/07/09 Tuesday at 4:00 pm (오프라인: 인하대 60주년 기념관 106호)
Speaker: Ulf Dieckmann (OIST)
Title: Adaptive dynamics theory as a versatile tool for understanding the evolutionary consequences of trait-mediated interactions
Time: 2024/06/25 Tuesday at 1:30 pm
Speaker: 채선희 (세종대)
Title: Modelling the population size and dynamics of the British grey seal
Ref: https://onlinelibrary.wiley.com/doi/full/10.1002/aqc.3134
Time: 2024/06/11 Tuesday at 1:30 pm
Speaker: 이나현 (세종대)
Title: The transition between the niche and neutral regimes in ecology
Ref: https://www.pnas.org/doi/abs/10.1073/pnas.1405637111
Time: 2024/05/28 Tuesday at 1:30 pm
Speaker: 권의준 (서울대)
Title: Generalized Lotka-Volterra Equations with Random, Nonreciprocal Interactions: The Typical Number of Equilibria
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.257401
Time: 2024/05/14 Tuesday at 1:30 pm
Speaker: 하미순 (조선대)
Title: Dynamic condensates in aggregation processes with mass injection
Ref: https://arxiv.org/abs/2307.16310
https://arxiv.org/abs/2312.15508
Time: 2024/04/30 Tuesday at 1:30 pm
Speaker: 이상훈 (경상국립대)
Title: Evidence of scale-free clusters of vegetation in tropical rainforests
Ref: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.109.L042402
Time: 2024/04/16 Tuesday at 1:30 pm
Speaker: 박종민 (APCTP)
Title: Migration alters oscillatory dynamics and promotes survival in connected bacterial populations
Ref: https://www.nature.com/articles/s41467-018-07703-y
Time: 2024/04/09 Tuesday at 1:30 pm
Speaker: 박혜진 (인하대)
Title: Emergent simplicity in microbial community assembly
Ref: https://www.science.org/doi/10.1126/science.aat1168
Time: 2024/03/26 Tuesday at 1:30 pm
Speaker: 채선희 (세종대)
Title: Explosive cooperation in social dilemmas on higher-order networks
Ref: https://arxiv.org/abs/2303.11475
Time: 2024/01/04 Thursday at 1:30 pm
Speaker: 이한빈(서울대)
Title: Exposing the randomness of statistical genetic inference
Abstract: Statistical inference in genetics literature involves multiple layers of randomness. Nevertheless, the source of randomness is rarely explicit, leading to confusion in inference targets and parameters. In this work, I construct a formal theory that combines evolutionary changes and statistical sampling processes. The theory is illustrated through examples including linear mixed models, principal component adjusted regression, and within-sibship association studies.
Time: 2023/12/21 Thursday at 4:00 pm
Speaker: 이현우(인하대)
Title: Delays in Fitness Adjustment Can Lead to Coexistence of Hierarchically Interacting Species
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.268101
Time: 2023/12/08 Friday at 4:00 pm
Speaker: 이나현 (세종대)
Title: Dimensional Reduction in Evolving Spin-Glass Model: Correlation of Phenotypic Responses to Environmental and Mutational Changes
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.218101
Time: 2023/10/20 Friday at 4:00 pm
Speaker: 권의준 (서울대)
Title: Evolutionary dynamics, evolutionary forces, and robustness: A nonequilibrium statistical mechanics perspective
Ref: https://www.pnas.org/doi/10.1073/pnas.2112083119
Time: 2023/10/06 Friday at 4:00 pm
Speaker: STATPHYS 발표영상
Time: 2023/09/08 Friday at 4:00 pm
Speaker: 박혜진 (인하대)
Title: Opening for MEEting RC 2023 fall semester (sharing references and discussion for the RC format)
Time: 2023/06/08 Thursday at 3:00 pm
Speaker: 하미순 (조선대)
Title: Evolutionary dynamics in a varying environment: Continuous versus discrete noise
Ref: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.L022004
Time: 2023/05/25 Thursday at 3:00 pm
Speaker: 양성규 (KIAS)
Title: Enhancing Biodiversity through Self-Regulation
Ref: https://arxiv.org/abs/2305.12341
Time: 2023/05/18 Thursday at 3:00 pm
Speaker: 채선희 (세종대)
Title: From Lotka-Volterra to Arditi-Ginzburg: 90 Years of Evolving Trophic Functions
Ref: https://link.springer.com/article/10.1134/S207908642003007X
Time: 2023/04/13 Thursday at 3:00 pm
Speaker: 이나현 (세종대)
Title: Enforcing Cooperation in the Social Amoebae
Ref: https://www.sciencedirect.com/science/article/pii/S0960982219304208
Time: 2023/03/23 Thursday at 3:00 pm
Speaker: 권의준 (서울대)
Title: Toward a Universal Model for Spatially Structured Populations
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.218102
Date: 2023/03/08-09
Time: 2023/02/09 Thursday at 10:30 am
Speaker: 이상훈 (경상국립대)
Title: Rethinking network community detection in the light of the Laplacian Renormalization Group
Ref: https://arxiv.org/abs/2301.04514 based on https://www.nature.com/articles/s41567-022-01866-8
Time: 2023/01/16 Monday at 4:30 pm
Speaker: 박혜진 (인하대)
Title: Deciphering microbial interactions and detecting keystone species with co-occurrence networks
Ref: https://www.frontiersin.org/articles/10.3389/fmicb.2014.00219/full
Time: 2022/12/12 Monday at 4:30 pm
Speaker: 정형채 (세종대)
Title: Species Clustering in Competitive Lotka-Volterra Models
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.98.258101
Time: 2022/11/21 Monday at 11:00 am
Speaker: Lucas Hedström (IceLab, Umeå Univ.)
Title: Modelling chromosome-wide target search
Abstract: The most common gene regulation mechanism is when a transcription factor protein binds to a regulatory sequence to increase or decrease RNA transcription. However, transcription factors face two main challenges when searching for these sequences. First, they are vanishingly short relative to the genome length. Second, many nearly identical sequences are scattered across the genome, causing proteins to suspend the search. But as pointed out in a computational study of LacI regulation in Escherichia coli, such almost-targets may lower search times if considering DNA looping. In this paper, we explore if this also occurs over chromosome-wide distances. To this end, we developed a cross-scale computational framework that combines established facilitated-diffusion models for basepair-level search and a network model capturing chromosome-wide leaps. To make our model realistic, we used Hi-C data sets as a proxy for 3D proximity between long-ranged DNA segments and binding profiles for more than 100 transcription factors. Using our cross-scale model, we found that median search times to individual targets critically depend on a network metric combining node strength (sum of link weights) and local dissociation rates. Also, by randomizing these rates, we found that some actual 3D target configurations stand out as considerably faster or slower than their random counterparts. This finding hints that chromosomes' 3D structure funnels essential transcription factors to relevant DNA regions.
Time: 2022/11/14 Monday at 4:30 pm
Speaker: 이주희 (인하대)
Title: Macroecological laws describe variation and diversity in microbial communities
Ref: https://www.nature.com/articles/s41467-020-18529-y
Time: 2022/10/27-29
Title: Modeling on Ecology and Evolution Workshop (MEEW)
Homepage: https://sites.google.com/view/eco-evo/home
Time: 2022/10/12 Wednesday at 10:00
Speaker: 박종일 (인하대)
Title: Seascape origin of Richards growth
Ref: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.105.014417
Time: 2022/09/19 Monday at 4:30 pm
Speaker: 박영재 (인하대)
Title: Consistent predator-prey biomass scaling in complex food webs
Ref: https://doi.org/10.1038/s41467-022-32578-5
Time: 2022/08/29 Monday at 1 pm
Speaker: Laura Schmid (KAIST)
Title: Evolution of cooperation via (in)direct reciprocity under imperfect information
Abstract: Evolutionary game theory provides various mechanisms for the evolution of cooperation in a population, based on simple game models. Two of the most prominent such mechanisms are direct and indirect reciprocity. Direct reciprocity is based on repeated interactions: individuals use their own experience to decide whether to cooperate with a given opponent. In indirect reciprocity, they also consider others' experiences and cooperate with those opponents that have a cooperative reputation themselves. By helping somebody, people increase their own public standing, which benefits them in future interactions. Direct and indirect reciprocity are intertwined, but they also exhibit striking differences. In this talk, I will first highlight one of the most fundamental ones: indirect reciprocity, as usually studied in isolation, is susceptible to errors, and its most successful strategies are not stable in the presence of imperfect information. This is however not true for direct reciprocity, and contributes to the difficulties of comparing the two mechanisms. In contrast, the second part of my talk will show a single theoretical framework that unites the two modes of reciprocity. Using this framework, we can analyze how to make decisions when different sources of information are available, and find a new simple successful strategy of indirect reciprocity with an immediate analogue in direct reciprocity. Our results help highlight that to sustain cooperation, already the most simple rules of reciprocity can suffice.
Time: 2022/08/18 Thursday at 1 pm
Speaker: 이주희 (인하대)
Title: Model for the interplay between plastic tradeoffs and evolution in changing environments
Ref: https://www.pnas.org/doi/full/10.1073/pnas.1915537117
Time: 2022/08/04 Thursday at 1 pm
Speaker: 이상훈 (경상국립대)
Title: The cost of information acquisition by natural selection
Ref: https://www.biorxiv.org/content/10.1101/2022.07.02.498577v1
Time: 2022/07/21 Thursday at 1 pm
Speaker: 이덕선 (KIAS)
Title: Stochasticity Leads to Coexistence of Generalists and Specialists in Assembling Mutualistic Communities
Ref: https://www.journals.uchicago.edu/doi/10.1086/720421
Time: 2022/07/07 Thursday at 1 pm
Speaker: 박혜진 (인하대)
Title: Extending the Lifespan of Multicellular Organisms via Periodic and Stochastic Intercellular Competition
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.218101
Time: 2022/06/10 Friday at 3 pm
Speaker: 박종일 (인하대)
Title: Phase Transition in a Non-Markovian Animal Exploration Model with Preferential Returns
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.148301
Time: 2022/05/27 Friday at 3 pm
Speaker: 박영재 (인하대)
Title: Nutrient cycling and self-regulation determine food web stability
Ref: https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2435.13961
Time: 2022/04/18 Monday at 2 pm
Speaker: 김진수 (POSTECH)
Title: Estimation of first passage times for stochastically modeled biochemical systems
Abstract: A first passage time in a stochastically modeled biochemical system is a random variable that can represent time when a critical event such as the first extinction or phenotypic transition, happens. While for a system having finitely many states, there is a well-known matrix inversion method to derive an analytic form of the expected first passage time, there is no simple approach for a system with infinitely many states. In this talk, we discuss state space truncation methods that are widely used to approximate the expected first passage times. While most methods of this kind focus on truncating the state space directly, in this talk we propose modifying the underlying chemical reaction network by introducing slack reactants that indirectly truncate the state space. We use the network structure imposed by slack reactants to prove the convergence of first passage times to the original first passage times. We then provide examples comparing our method with the previous truncation-based methods.
Time: 2022/04/08 Friday at 3 pm
Speaker: 하미순 (조선대)
Title: Slow expanders invade by forming dented fronts in microbial colonies
Ref: https://www.pnas.org/doi/full/10.1073/pnas.2108653119
Related papers:
Time: 2022/03/25 Friday at 3 pm
Speaker: 이주희 (인하대)
Title: Artificial selection of communities drives the emergence of structured interactions
Ref: https://arxiv.org/abs/2112.06845
Time: 2022/03/11 Friday at 3 pm
Speaker: 이상훈 (경상국립대)
Title: Thermodynamics of evolution and the origin of life
Ref: https://www.pnas.org/doi/10.1073/pnas.2120042119
Accompanying paper: https://www.pnas.org/doi/10.1073/pnas.2120037119
Time: 2022/02/25 Friday at 3 pm
Speaker: 이덕선 (KIAS)
Title: The transition between the niche and neutral regimes in ecology
Ref: https://www.pnas.org/content/111/36/13111
Time: 2022/02/11 Friday at 3 pm
Speaker: 박혜진 (APCTP)
Title: Stirring does not make populations well mixed
Ref: https://www.nature.com/articles/s41598-018-22062-w
Time: 2022/01/21 Friday at 3 pm
Speaker: 박영재 (APCTP)
Title: Degree heterogeneity and stability of ecological networks
Ref: https://royalsocietypublishing.org/doi/10.1098/rsif.2017.0189
Time: 2022/01/07 Friday at 3 pm
Speaker: 김유섭 (이화여대)
Title: Grandmother hypothesis and primate life histories
Ref: https://onlinelibrary.wiley.com/doi/10.1002/1096-8644(200011)113:3%3C435::AID-AJPA11%3E3.0.CO;2-O
Time: 2021/12/17 Friday at 3 pm
Speaker: 이상훈 (경상국립대)
Title: 하천 네트워크 데이터 분석
Time: 2021/12/10 Friday at 3 pm
Speaker: 이주희 (APCTP)
Title: Controlling the speed and trajectory of evolution with counterdiabatic driving
Ref: https://www.nature.com/articles/s41567-020-0989-3
Time: 2021/11/26 Friday at 3 pm
Speaker: 이상훈 (경상국립대학교)
Title: Local and collective transitions in sparsely-interacting ecological communities
Ref: https://arxiv.org/abs/2110.13603
Time: 2021/10/29 Friday at 3 pm
Speaker: 이덕선 (KIAS)
Title: Effect of Resource Dynamics on Species Packing in Diverse Ecosystems
Ref: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.048101
Time: 2021/10/15 Friday at 3 pm
Speaker: 박혜진 (APCTP)
Title: Phenotypic Diversity, Population Growth, and Information in Fluctuating Environments
Ref: https://www.science.org/doi/abs/10.1126/science.1114383
Time: 2021/09/24 Friday at 3 pm
Speaker: 박영재 (APCTP)
Title: Nonlinear delay differential equations and their application to modeling biological network motifs
Ref: https://www.nature.com/articles/s41467-021-21700-8
Time: 2021/09/10 Friday at 3 pm
Speaker: 김유섭 (이화여대)
Title: The Probability of Fixation in Populations of Changing Size
Ref: https://www.genetics.org/content/146/2/723, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1208011/
Time: 2021/06/02
Speaker: Ryosuke Iritani (iTHEMS RIKEN)
Title: Information-theoretic view of community ecology
Abstract: Understanding the dynamics of biodiversity is of pivotal importance to all the fields of ecology and evolution, despite the lack of a useful, or reference, framework, to that aim. In this talk, I will introduce an information-theoretical viewpoint to formalize the dynamics of biodiversity for a simple incidence-based ecological data. To this end, I will first talk about the background motivation. Second I will introduce my current preliminary work on the analytical treatment of the model with the help of statistical mechanics. The current work is very open to collaboration and so any questions are appreciated.
Time: 2021/05/21
Speaker: 이경은 (국립생태원)
Title: Beta-diversity patterns of benthic macroinvertebrate metacommunities
Abstract: Biodiversity maintenance garners a special attention nowadays, considering both species-loss due to environmental disturbances (e.g., climate change) in one hand and importance of keeping natural resources (e.g., ecological and genetic reservoirs) in the other hand. Diversity index is a key measurement in monitoring biodiversity. Aquatic ecosystems, however, are highly heterogenous locally and globally due to various source of natural and anthropogenic variability. Biodiversity has been conventionally measured by point-wise local community data pertaining to sampling sites (α diversity). In this study, we investigate an extended diversity that present how local diversities are spatially differentiated, so-called β diversity. We combine α diversities for benthic macroinvertebrates collected in the River system in southern peninsula of Korea. Spatial clustering was initially conducted on community using an artificial-neural network, Geo-Self-Organizing Map (Geo-SOM). β diversities were subsequently measured in different spatial clusters according to linear and water course distances. Inter-community properties including nestedness and spatial turnover were accordingly revealed in species compositions across different sampling sites. Local and species contributions to β diversity further reflected topographic and anthropogenic effects on clustered communities. Necessity of spatial approach to biodiveristy is further discussed regarding sustainable management of stream communities.
Time: 2021/03/03
Speaker: Guy Bunin (Physics Department, Technion)
Title: Random interactions and high-dimensionality in ecology
Abstract: Natural ecosystems exhibit astounding richness. This suggests that we treat them as many-variable interacting systems, but is there any evidence to support this perspective? I will discuss possible footprints of high-dimensionality, including phase-transitions, and thermodynamic variables which determine the system's large-scale behavior. The latter are found in a wide range of accepted models in the field. Then, I'll present a theory for how interactions organize to allow many species to coexist. Data from plant-competition experiments confirms the theoretical predictions, providing evidence for high-dimensionality in that ecosystem.
Time: 2021/01/07
Speaker: Dong Soo Hwang (POSTECH)
Title: Foul plays a key role in plastic degradation
Abstract: When plastic wastes are thrown into the environment, a microbial community using them as an organic carbon source, surrounds the surface of the plastic. This phenomenon is called biofouling or biofilm formation. In the biofilm, there are not only microorganisms and enzymes that degrade plastic wastes, but also communication chemicals that help control the composition and population of microbes. Therefore, understanding biofilm on plastic waste is a key step in the biodegradation of plastic waste. In this presentation, I will present the microbe screening process for plastic waste degradation. Specifically, the bacterial consortium isolation process from the gill of marine filter-feeders, such as mussels & tunicate, and the gut of lignin (polyphenol eating) insects, will be presented, and the degradation of the target plastic with the bacterial consortium will be discussed.
Time: 2020/11/06
Speaker: Arne Traulsen (Max Planck Institute for Evolutionary Biology)
Title: Evolutionary dynamics on small networks
Abstract: Evolutionary dynamics can be strongly affected by spatial structure. A popular way to model such spatial structure are networks, where each node represents an individual and offspring can be placed to other sites via the links. How does such a network affect the probability of a new mutation to take over the entire population? And how does it alter the time this process is expected to take? Of particular interest are structures that increase the probability that advantageous mutations take over. Such amplifiers are surprisingly abundant among all networks. Looking at all undirected networks up to a certain size also reveals general properties of such amplifiers and allows to identify particular structures for further analysis. These approaches reveal general properties of networks that are often surprising and counter-intuitive and shed new light on the evolution of populations with complex spatial structure.
Time: 2020/08/07
Speaker: Deok-Sun Lee (Korea Institute for Advanced Study)
Title: Stability of ecological networks
Abstract: It is of great interest how much the state of an ecological system, such as biodiversity or species abundance, is robust against perturbations. In this talk I will try to give a brief overview of mathematical approaches for defining and answering this question - the dynamic stability of ecological systems. Given the increasing availability of large-scale empirical data, the structure of interspecific interactions is being disclosed, and I will discuss how the network structure is related to dynamic stability.
Time: 2020/08/07
Speaker: Seung Ki Baek (Pukyong National University)
Title: Sex-ratio bias induced by mutation
Abstract: A question in evolutionary biology is why the number of males is approximately equal to that of females in many species, and Fisher's theory of equal investment answers that it is the evolutionarily stable state. The Fisherian mechanism can be given a concrete form by a genetic model based on the following assumptions: (1) Males and females mate at random. (2) An allele acts on the father to determine the expected progeny sex ratio. (3) The offspring inherits the allele from either side of the parents with equal probability. The model is known to achieve the 1:1 sex ratio due to the invasion of mutant alleles with different progeny sex ratios. In this study, however, we argue that mutation plays a more subtle role in that fluctuations caused by mutation renormalize the sex ratio and thereby keep it away from 1:1 in general. This finding shows how the sex ratio is affected by mutation in a systematic way, whereby the effective mutation rate can be estimated from an observed sex ratio.
Time: 2020/07/22
Speaker: Changku Kang (Mokpo National University)
Title: The use of comparative methods to test evolutionary hypotheses: case studies on animal coloration
Abstract: Every species differs from each other. This inter-specific variation in traits show the consequences of different evolutionary forces exerted on different species, thus many evolutionary biologists have been interested in unravelling the evolutionary pressures that shaped such trait diversity. When comparing traits among different organisms, a problem occurs since traits of different species are not independent but nested within one other in phylogenies (evolutionary relationships among different organisms); in other words, different organisms may have similar traits simply because they share the same ancestor. Thus, to compare different organisms and analyse inter-specific trait data properly, it is pivotal to account for this shared ancestry. Modern phylogenetic comparative methods allow us to study adaptations by statistically disentangling the effect of shared ancestry. In this seminar, I will introduce several case studies that used phylogenetic comparative methods to tackle evolutionary questions on the evolution of animal coloration.
Time: 2020/07/22
Speaker: Chang Seok Han (Kyung Hee University)
Title: Quantifying social effects using variance partitioning approaches
Abstract: 다툼, 구애, 협동, 양육 등 살아가면서 마주치는 다른 개체와의 상호작용은 자연계에서 매우 흔하게 나타납니다. 그러한 사회적 상호작용이 개체의 형질 발현에 미치는 영향은 '보이지 않는 손'으로 여겨지며, 그 영향을 정량화하려는 연구가 거의 없었습니다. 하지만 최근 행동생태학 연구에서는 양적유전학(quantitative genetics)에서 사용되는 분석법을 이용하여 사회적 영향을 정량화하는 시도가 이어지고 있습니다. 본 발표에서는 양적유전학에서의 분산구분법(variance partitioning approach)을 통해 형질 발현에 미치는 사회적 영향을 어떻게 정량화할 수 있는지를 소개하며, 현재까지의 여러 실험 연구를 말씀드릴 것입니다.
Time: 2020/07/06
Speaker: Seung-Woo Son (Hanyang University)
Title: 게임이론에서 전략들의 네트워크 구조
Abstract: We considered the replicator dynamics to study an iterated prisoners' dilemma game with memory. In this study, we investigate the characteristics of all 32 possible strategies with a single-step memory by observing the results when each strategy encounters another one. Based on these results, we define similarity measures between the 32 strategies and perform a network analysis of the relationship between the strategies by constructing a strategies network.
Time: 2020/07/06
Speaker: Sang Hoon Lee (Gyeongnam National University of Science)
Title: Ecological networks: Nested or not—or does it really matter?
Abstract: The concept of nestedness, in particular for ecological and economical networks, has been introduced as a structural characteristic of real interacting systems. In this talk, starting from basic concepts of network science, I will present a few selective examples of measures and techniques developed in network science, which can be useful to analyze structural properties of ecological systems, in particular, mutualistic interactions between plants and animals. Based on them, I have discovered that the "traditional" notion of nestedness is in fact related to other mesoscale network properties such as the so-called core-periphery structure. With real ecological mutualistic networks and synthetic model networks, I have reported the strong correlation between the nestedness and core-periphery-ness (likeness to the core-periphery structure), by defining the network-level measures for nestedness and core-periphery-ness in the case of weighted and bipartite networks [1]. However, at the same time, via more sophisticated null-model analysis, I have also discovered that the degree (the number of connected neighbors of a node) distribution poses quite severe restrictions on the possible nestedness and core-periphery parameter space. Therefore, there must exist structurally interwoven properties in more fundamental levels of network formation, behind this seemingly obvious relation between nestedness and core-periphery structures. More recently, in collaboration with ecologists, we have (boldly) suggested that the core-periphery structure could be even more relevant to describe the mutualistic interactions than nestedness, from literature survey along with our own analysis [2]. As a final remark, I would like to emphasize the necessity for further studies on the relationship between network structures and the ecological stability, which might be one of the least studied topics in network science, I dare to add.
References
[1] S. H. Lee, Phys. Rev. E 93, 022306 (2016).
Time: 2020/06/24
Speaker: Beom Jun Kim (Sungkyunkwan University)
Title: Genetic algorithm with different environmental conditions
Abstract: We propose an extended genetic algorithm (GA) with different local environmental conditions. Genetic entities, or configurations, are put on nodes in a ring structure, and location-dependent environmental conditions are applied for each entity. Our GA is hinted by the geographic bottleneck effect in natural evolution: Geographic isolation reduces the diversity in a local group, but at the same time, can enhance intergroup diversity. The migration and mating of genetic entities across separate locations can provide a sufficient genetic diversity in the gene pool. Our extended GA is validated for the ground state of the three-dimensional spin-glass system with a spatially-and-temporally oscillating external magnetic field mimicking heterogeneous environments in nature. We numerically confirm that the use of different environmental conditions in GA makes it possible to find the lower-energy spin configurations at relatively shorter computation time. We emphasize that our GA with location-specific heterogeneous environmental condition can be applied for a broad research area in which finding of the optimal state in a shorter computation time is the key problem.
Time: 2020/06/24
Speaker: Yuseob Kim (Ewha Womans University)
Title: Nativa frequency-dependent selection in adaptive biological evolution and the maintenance of genetic variation
Abstract: How natural selection, the driving force of evolution first proposed by Charles Darwin, occurs in real ecosystem is a fundamental question in evolutionary biology. Classical theories in population genetics assume that adaptive evolution occurs when a beneficial mutation arises and then increases in frequency under constant selective pressure until it becomes fixed in the population. However, our empirical and theoretical analyses suggest that selective pressure on a beneficial variant is frequently not constant but negative frequency-dependent. First, when we detected the footprint of natural selection or selective sweep from DNA sequence variation in African populations of fruit flies (Drosophila melanogaster), we found that at many genes the same beneficial mutations arose to intermediate frequencies in multiple geographic regions, which cannot be explained unless the pressures of positive selection diminished as mutations frequencies increased. Mathematical analyses and computer simulations confirmed this result. Second, our mathematical model of seasonally fluctuating selection revealed that a variant conferring advantage in one season but disadvantage in the other season can be maintained in intermediate frequencies when the variant is partially protected from selection. This condition that leads to the emergence of negative frequency-dependent selection is called the storage effect. Computer simulations showed that this effect can maintain the high levels of phenotype-changing genetic variation, the fundamental ingredient of adaptive biological evolution, at many loci in the genome.