Bibliographic Details
| Title: |
Demographic Basis of Spatially Structured Fluctuations in a Threespine Stickleback Metapopulation. |
| Authors: |
Phillips, Joseph S.1,2 (AUTHOR) josephphillips@creighton.edu, Einarsson, Árni3 (AUTHOR), Strickland, Kasha1 (AUTHOR), Ives, Anthony R.2 (AUTHOR), Kristjánsson, Bjarni K.1 (AUTHOR), Räsänen, Katja4 (AUTHOR) |
| Superior Title: |
American Naturalist. Mar2023, Vol. 201 Issue 3, pE41-E55. 15p. |
| Subject Terms: |
*THREESPINE stickleback, *POPULATION biology, *POPULATION viability analysis, *TIME series analysis, *SYNCHRONIC order, *STICKLEBACKS |
| Geographic Terms: |
ICELAND |
| Abstract: |
Uncovering the demographic basis of population fluctuations is a central goal of population biology. This is particularly challenging for spatially structured populations, which require disentangling synchrony in demographic rates from coupling via movement between locations. In this study, we fit a stage-structured metapopulation model to a 29-year time series of threespine stickleback abundance in the heterogeneous and productive Lake Mývatn, Iceland. The lake comprises two basins (North and South) connected by a channel through which the stickleback disperse. The model includes time-varying demographic rates, allowing us to assess the potential contributions of recruitment and survival, spatial coupling via movement, and demographic transience to the population's large fluctuations in abundance. Our analyses indicate that recruitment was only modestly synchronized between the two basins, whereas survival probabilities of adults were more strongly synchronized, contributing to cyclic fluctuations in the lake-wide population size with a period of approximately 6 years. The analyses further show that the two basins were coupled through movement, with the North Basin subsidizing the South Basin and playing a dominant role in driving the lake-wide dynamics. Our results show that cyclic fluctuations of a metapopulation can be explained in terms of the combined effects of synchronized demographic rates and spatial coupling. [ABSTRACT FROM AUTHOR] |
|
Copyright of American Naturalist is the property of University of Chicago and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Academic Search Premier |
