Daphnia spp.

Daphnia spp. is also known as the common water flea.

Fun fact! Daphnia Exhibit jumping like characteristics while swimming!

Synopsis-Scientists wanted to determine if field cages were a reliable method for collecting individual‐level life history data in Daphnia magna.

Kingdom- Animalia

Phylum-Arthropoda

Subphylum-Crustacea

Class-Branchiopoda

Order-Anomopoda

Family-Daphniidae

Genus- Daphnia

Species- spp.

-Eukaryotic-multicellular

-Freshwater Crustaceans

-Bodies are enclosed by uncalcified shell

-Exoskeleton made of chitin and calcium

Daphnia feed on small particles floating around in the water, also planktonic algae

Habitat: Large range-Ponds, lakes, rock pools, and vernal pools.

General Characteristics: Exhibit jumping like characteristics while swimming

Use a large antennae to help move them through the water

Have an open blood circulation

Have osmoregulation problems with not enough solute

Reproduce asexually, females produce eggs.

Experiment-Measuring Daphnia life history in the wild: The efficacy of individual field cages

Authors-Michael O’Connor, Daniel E. Sadler, Franziska S. Brunner, Alan Reynolds, Nicola White, Stephen Price, and Stewart J. Plaistow

Scientists wanted to determine if field cages were a reliable method for collecting individual‐level life history data in Daphnia magna.

All Daphnia used were taken from laboratory lines from Brown Moss Reserve

Kept at 21 degrees Celsius

Used 86 individual cloned D. Magna in caged and uncaged treatments.

Experiment results- Individuals inside cage mature at smaller size, but end up growing faster as an adult.

Conclusion

-Scientists were able to measure and compare phenotypes from inside and outside of the cages.

-Scientists could effectively measure growth rate.

-Conclusion-Field cages are a very effective way to collect individual data for very small individuals that can’t be tracked or marked.

References

Images-

https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Daphnia_magna_infected_with_the_Pasteuria_ramosa.jpg/180px-Daphnia_

magna_infected_with_the_Pasteuria_ramosa.jpg

-https://en.wikipedia.org/wiki/Daphnia_magna

-https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668787/

-https://www.ncbi.nlm.nih.gov/books/NBK2042/

REFERENCES

MY PRIMARY SOURCE IS:

Michael O’Connor, Daniel E. Sadler, Franziska S. Brunner, Alan Reynolds, Nicola White, Stephen Price, and Stewart J. Plaistow. 2021. “Measuring Daphnia life history in the wild: The efficacy of individual field cages.” Ecol-Evol 23. 16927–16935.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8668787/ .

MY MAIN SECONDARY SOURCE IS:

Ebert Dieter. 2005. “Introduction to Daphnia Biology.” Retrieved August 29, 2022 at

https://www.ncbi.nlm.nih.gov/books/NBK2042/ .

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