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Boundary Bay Tradeoffs

439 Words2 Pages

Tradeoffs are a frequent occurrence in Nature. They describe the compromise between two optimal but frequently incompatible traits for an organism. Andrea Pomeroy and her team applied this concept of tradeoffs to the western sandpipers, Calidris mauri, of British Columbia Canada, with the trade off of their ability to forage for food against the costs of potential predation.
The main idea examined by Pomeroy was to study the spatial usage (The measure of how intensely a site is used for foraging by the sandpipers) at Boundary Bay, to determine how the birds chose their stop over sites during migration based on the tradeoffs between food abundance and predation risks. By doing this they could determine whether food abundance should be the key …show more content…

They determined usage by counting the dropping quantities at individual marked areas along the Bay, therefore determining how many birds stopped over at this site during their north and south migrations and where …show more content…

Their results indicated that there is a trade off with sandpipers between food availability and safety. There were far fewer than expected sandpipers in areas with high food abundance where the danger is high and greater than predicted numbers in areas where the safety increased. This led to the conclusion that the quality of a site for conservation should be determined by not only food abundance but also predation risks as well. Certain sites cannot be protected based on the fact that they have a high availability of food as those areas may also have an increased presence of predators. Pomeroys ' experiment suggests that both an abundant food source and the potential presence of predators can determine the choice of a site as a migratory stopover for sandpipers, and as such should be taken into consideration when determining habitat conservation acts for the

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