Premium
Species assortment or habitat filtering: a case study of spider communities on lake islands
Author(s) -
Ulrich Werner,
Hajdamowicz Izabela,
Zalewski Marcin,
Stańska Marzena,
Ciurzycki Wojciech,
Tykarski Piotr
Publication year - 2010
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/s11284-009-0661-y
Subject(s) - ecological niche , habitat , ecology , ecological release , niche , competition (biology) , spider , niche segregation , biology , niche differentiation , character displacement , co occurrence , genus , artificial intelligence , computer science , sympatry
Competition theory predicts that species of similar ecological niches are less likely to coexist than species with different niches, a process called species assortment. In contrast, the concept of habitat filtering implies that species with similar ecological requirements should co‐occur more often than expected by chance. Here we use environmental and ecological data to assess patterns of co‐occurrence of regional communities of spiders distributed across two assemblies of lake islands in northern Poland. We found aggregated and random co‐occurrences of species of the same genus and a significant tendency of species segregation across genera. We also found that species of the same genus react similarly to important environmental variables. A comparison of ecological traits of species of the local communities with those expected from a random sample from the regional Polish species pool corroborated partly the habitat filtering hypothesis. On the other hand, we did not find evidence for species assortment. Our results also imply that at least some observed species co‐occurrences result from niche differentiation.