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A sink host allows a specialist herbivore to persist in a seasonal source
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Orientador(es)
Resumo(s)
In seasonal environments, sinks that are more persistent than sources may
serve as temporal stepping stones for specialists. However, this possibility
has to our knowledge, not been demonstrated to date, as such environments
are thought to select for generalists, and the role of sinks, both in the field
and in the laboratory, is difficult to document. Here, we used laboratory
experiments to show that herbivorous arthropods associated with seasonally
absent main (source) habitats can endure on a suboptimal (sink) host for
several generations, albeit with a negative growth rate. Additionally, they
dispersed towards this host less often than towards the main host and
accepted it less often than the main host. Finally, repeated experimental evolution
attempts revealed no adaptation to the suboptimal host. Nevertheless,
field observations showed that arthropods are found in suboptimal habitats
when the main habitat is unavailable. Together, these results show that evolutionary
rescue in the suboptimal habitat is not possible. Instead, the sink
habitat functions as a temporal stepping stone, allowing for the persistence
of a specialist when the source habitat is gone.
Descrição
Palavras-chave
environmental variability source–sink system experimental evolution host adaptation stepping stone
Contexto Educativo
Citação
Laska A, Magalhães S, Lewandowski M, Puchalska E, Karpicka- Ignatowska K, Radwańska A, Meagher S, Kuczyński L, Skoracka A. 2021 A sink host allows a specialist herbivore to persist in a seasonal source. Proc. R. Soc. B 288: 20211604. https://doi.org/10.1098/rspb.2021.1604
Editora
The Royal Society