期刊
FRESHWATER BIOLOGY
卷 58, 期 9, 页码 1958-1967出版社
WILEY
DOI: 10.1111/fwb.12183
关键词
agonistic behaviour; alien species; interspecific competition; North American crayfishes; temperature
资金
- Regional Council of Poitou-Charentes (France) within the Programme Regional de Bourses de Chercheur Invite' at the University of Poitiers
1. Climate warming often leads to shifts in the strength and sign of agonistic interactions among species, which in turn may change their distribution ranges. Notwithstanding the ubiquity of this phenomenon, there is scant literature about how interspecific agonistic behaviour changes with altered thermal regime, especially for invasive species such as three widespread North American crayfishes in Europe (Orconectes limosus, Procambarus clarkii and Pacifastacus leniusculus). 2. We conducted a laboratory study to analyse some descriptors of agonistic behaviour in fighting dyads of similarly sized males of the three species' combinations, both at 20 degrees C (the current maximum water temperature in the study area, central France) and 27 degrees C (the maximum expected in the next 80years under the more pessimistic IPCC greenhouse gas emission scenario). 3. The results showed significantly different responses to warming by the three crayfishes. At 27 degrees C, O. limosus spent more time motionless and P.leniusculus was more often the subordinate, independent of the opponent. On the contrary, the agonistic strategy of P.clarkii did not change with temperature: when engaged in fighting, this species outcompeted both O.limosus and P.leniusculus. 4. Caution should be taken when extrapolating laboratory studies to the field, but these results, combined with outputs of previous modelling exercises, suggest that European catchments will become dominated by P.clarkii with climate warming. Ultimately, this might lead to impoverished biodiversity, simplified food webs and altered ecosystem services.
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