Free on the web:
https://doaj.org/ DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. No login required, advanced search option.
http://www.sciencedirect.com/ Search for peer-reviewed journals, articles, book chapters and open access content from Elsevier.. Create a free account to use the “open access” filter. Advanced search tutorial
https://www.ncbi.nlm.nih.gov/pmc/ PubMed Central® (PMC) is a free full-text archive of biomedical and life sciences journal literature at the U.S. National Institutes of Health's National Library of Medicine (NIH/NLM). Can limit 1, 5, 10 yrs, and by funding source.
https://www.biomedcentral.com/ BMC publishes its own open access journals.
https://www.plos.org/ PLOS publishes its own journals. No advanced search option. These are searchable through DOAJ, PMC or PLOS.
https://scholar.google.com/ Try this, too!
https://academic.microsoft.com/ free online articles
https://www.hindawi.com/journals/ open access
https://www.mdpi.com/about/journals open access
https://www.frontiersin.org/about/about-frontiers open access
Limited access:
https://www.aps.org but starting in 2018 high-energy physics articles in three APS journals (Physical Review Letters, Physical Review D, and Physical Review C) will be published open access.
Nonprofit organizations
http://worldwidescience.org General science information of all types
NWF National Wildlife Federation is America's largest conservation organization with habitat and species information.
Ocean Conservancy , Ocean Outreach , The Safina Center (Formerly Blue Ocean Institute) Earth911 Conservation-minded information. Look at Blue Ocean for information on sustainable seafood, Earth911 for information on recycling.
Environmental Defense Fund Partnering with many different groups to find environmental solutions that work
Acoustic Ecology Acoustics and science
IUCN Red List IUCN Redlist of endangered species
http://www.arkive.org/ Endangered species with google earth tie-in.
Colleges and Universities
Woods Hole Oceanic Institute Oceanus Scientific articles about the marine topics
State government
SC DNR Everything the state of South Carolina wants you to know about our natural resources. Find links to Marine Resources Division, saltwater fishing, the Ace Basin, and other state conservation issues. Search for Species Gallery in the top search bar to find information on Birds, Reptiles, Plants, Mammals, Fish, and Invertebrates.
Federal Government
NOAA National Oceanic and Atmospheric Administration. Everything the government wants you to know about the oceans. Search for Marine Fisheriesfor the exact page for your species project.
Marine Life @ NOAA Wildlife at national marine sanctuaries
NMFS Regulations from the National Marine Fisheries Service
EPA: Environmental education (EE) is a multi-disciplinary approach to learning about environmental issues that enhances knowledge, builds critical thinking skills and helps students make informed and responsible decisions.
https://envirodatagov.org/ - EDGI is building online tools, events, and research networks to proactively archive public environmental data and ensure its continued public availability.
http://climatemirror.org/ an open project to mirror public climate change databases