HR: 15:45h
AN: NB14F-02 INVITED [Abstracts]
TI: Comparing Community Trait Patterns of Macroinvertebrates in Mediterranean and Temperate Regions.
AU: * Bonada, N
EM: nuria.bonada@univ-lyon1.fr
AF: Universite Claude Bernard Lyon 1. CNRS-Ecologie des Hydrosystemes Fluviaux., 43 Bd. 11 Novembre 1918,
Villeurbanne Cedex, F-69622 France
AU: Statzner, B
EM: statzner@biomserv.univ-lyon1.fr
AF: Universite Claude Bernard Lyon 1. CNRS-Ecologie des Hydrosystemes Fluviaux., 43 Bd. 11 Novembre 1918,
Villeurbanne Cedex, F-69622 France
AU: Doledec, S
EM: sylvain@biomserv.univ-lyon1.fr
AF: Universite Claude Bernard Lyon 1. CNRS-Ecologie des Hydrosystemes Fluviaux., 43 Bd. 11 Novembre 1918,
Villeurbanne Cedex, F-69622 France
AB:
Streams in mediterranean regions have highly seasonal discharge patterns, with predictable torrential floods and severe
droughts. In contrast, discharge variations are less extreme in temperate regions and intermittent flow conditions are
uncommon. Given that regional or large-scale filters should determine the local trait composition of communities, we
hypothesize that climatic differences between mediterranean and temperate regions cause differences in macroinvertebrate
trait patterns (e.g. in traits that favor drought resistance and drought recovery). Using published and unpublished data, we
assembled the abundance of macroinvertebrate genera of 100 sites in the Mediterranean Basin region and 100 sites in the
European temperate region and linked these abundances to published information on 63 categories of 11 biological traits.
Significant differences were found between regions for almost all traits, with an overall variability in trait composition of 17%. Surprisingly, resistance forms did not discriminate mediterranean and temperate regions. In comparison with temperate
regions, mediterranean regions had smaller size individuals with more than one reproductive cycle per year, reflecting a
higher resilience capability of macroinvertebrates. The higher proportion of swimmers and spiracles breathers can be
explained by the dominance of lentic habitats during drought in mediterranean regions.
DE: 1845 Limnology
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly