Potential Impact of Carry-Over Effects in the Dynamics and Management of Seasonal Populations.
| Autor: | Eduardo Liz, Alfonso Ruiz-Herrera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | PLoS ONE, Vol 11, Iss 5, p e0155579 (2016) |
| Druh dokumentu: | article |
| ISSN: | 1932-6203 70474699 |
| DOI: | 10.1371/journal.pone.0155579 |
| Popis: | For many species living in changing environments, processes during one season influence vital rates in a subsequent season in the same annual cycle. The interplay between these carry-over effects between seasons and other density-dependent events can have a strong influence on population size and variability. We carry out a theoretical study of a discrete semelparous population model with an annual cycle divided into a breeding and a non-breeding season; the model assumes carry-over effects coming from the non-breeding period and affecting breeding performance through a density-dependent adjustment of the growth rate parameter. We analyze the influence of carry-over effects on population size, focusing on two important aspects: compensatory mortality and population variability. To understand the potential consequences of carry-over effects for management, we have introduced constant effort harvesting in the model. Our results show that carry-over effects may induce dramatic changes in population stability as harvesting pressure is increased, but these changes strongly depend on whether harvesting occurs prior to reproduction or after it. |
| Databáze: | Directory of Open Access Journals |
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