A carregar...
Publicação
Effects of nonnative species on the stability of riverine fish communities
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 1.49 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Despite the increasing ubiquity of biological invasions worldwide, little is known
about the scale-dependent effects of nonnative species on real-world ecological dynamics.
Here, using an extensive time series dataset of riverine fish communities across different
biogeographic regions of the world, we assessed the effects of nonnative species
on the temporal variability and synchrony in abundance at different organizational levels
(population, metapopulation, community and metacommunity) and spatial scales
(stream reach and river basin). At the reach scale, we found that populations of nonnative
species were more variable over time than native species, and that this effect scaled
up to the community level – significantly destabilizing the dynamics of riverine fish
communities. Nonnative species not only contributed to reduced community stability,
but also increased variability of native populations. By contrast, we found no effect of
nonnative species dominance on local interspecific synchrony among native species. At
the basin scale, nonnative metapopulations were again more variable than the native
ones. However, neither native metapopulations nor metacommunities showed differences
in temporal variability or synchrony as nonnative species dominance increased
basin-wide. This suggests a ‘dilution effect’ where the contribution to regional stability
of local native populations from sites displaying low levels of invasion reduced the
destabilizing effects of nonnative species. Overall, our results indicate that accounting
for the destabilizing effect of nonnative species is critical to understanding native species
persistence and community stability
Descrição
Research
Palavras-chave
abundance fluctuations biological invasions interspecific synchrony metacommunity temporal variability time-series
Contexto Educativo
Citação
Ecography, 43: 1156–1166, 2020
Editora
Nordic Society Oikos