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A model of functional response in the blue mussel (Mytilus edulis): From individuals to populations
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Knowing the right functional response is important when modelling populations, assuming a type 1 functional response in place of, e.g., a type 3 will almost certainly result in different structures and dynamics for the food webs modeled. This project investigates functional responses in blue mussels (Mytilus edulis). The aim of this study is to investigate if predicted functional response changes, depending on whether one measure it on an individual, or on a whole population and take the average. I make the hypothesis that there is a change from type 1 to type 3 and that it might be because of individual variation. I construct a model with a type 1 functional response for one individual with individual variation in clearance rate (CR). The parameters used are estimated from literature. The model was run with both single individuals and populations and the resulting functional responses were plotted. This showed that the population functional response has a logistic shape at first, and then a linear shape. To test the model’s accuracy parameters were taken from an article that measured CR at different algae concentrations. The model was run to simulate distributions of CR values and 95% confidence intervals were generated. The model proved to be quite accurate since four of five observed CR values fitted inside the confidence intervals. In conclusion, there is a difference in functional response depending on how the measurement is done, and the duration of the assay is important to get a correct estimate of the CR. 

Place, publisher, year, edition, pages
2015. , 20 p.
Keyword [en]
Mytilus edulis, mussels, functional response, clearance rate, ingestion rate
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-105701OAI: diva2:827672
Educational program
Bachelor of Science in Biology and Earthscience
Available from: 2015-06-29 Created: 2015-06-29 Last updated: 2015-06-29Bibliographically approved

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Department of Ecology and Environmental Sciences
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