Abstract:
:Spatial and temporal heterogeneity in relative fitness of competing species is a key factor affecting the structure of communities. However, it is not intuitive why species that are ecologically similar should differ in their response to environmental changes. Here we show that two sympatric flycatchers differ in reproductive strategy and in sensitivity to harsh environment. The fitness of collared flycatchers (Ficedula albicollis), which are dominant in interference competition, is more sensitive than the fitness of pied flycatchers (Ficedula hypoleuca) to the seasonal decline in environmental conditions. In order to control for the possibility that this pattern arises solely from differences in microhabitat use (i.e. a local niche differentiation), we performed a partial cross-fostering experiment of young between the two species (i.e. resulting in nests containing young of both species). Our results show that the growth of nestling pied flycatchers is less influenced by the seasonal decline in environmental conditions. We suggest that a life-history trade-off between interference competitive ability and robustness to harsh environment promotes a regional coexistence of the two species.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Qvarnström A,Svedin N,Wiley C,Veen T,Gustafsson Ldoi
10.1098/rsbl.2004.0265subject
Has Abstractpub_date
2005-03-22 00:00:00pages
68-71issue
1eissn
1744-9561issn
1744-957Xpii
W1V6U574L08JQ727journal_volume
1pub_type
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