Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/48431
Title: Spatial scale effects on taxonomic and biological trait diversity of aquatic macroinvertebrates in Mediterranean streams
Author: García-Roger, E. M.
Sánchez-Montoya, María del Mar
Cid Puey, Núria
Erba, S.
Karaouzas, I.
Verkaik, Iraima
Rieradevall i Sant, Maria
Gómez, R.
Suárez, M. L.
Vidal-Abarca Gutiérrez, María Rosario
Demartini, D.
Buffagni, A.
Skoulikidis, N.
Bonada i Caparrós, Núria
Prat i Fornells, Narcís
Keywords: Invertebrats d'aigua dolça
Taxonomia (Biologia)
Ecologia d'aigua dolça
Cursos d'aigua
Mediterrània (Regió)
Freshwater invertebrates
Taxonomy (Biology)
Freshwater ecology
Rivers
Mediterranean Region
Issue Date: 19-Aug-2013
Publisher: Schweizerbart
Abstract: We examined the effect of spatial scale on aquatic macroinvertebrate communities in Mediterranean streams from six basins distributed across southern Europe, including Spain, France, Italy, and Greece. We classified the studied streams according to their long-term aquatic regime into the three following types: (i) permanent (P), (ii) intermittent with summer pools (I-P), and (iii) intermittent with summer dry channels (I-D). For each stream type, we analyzed taxonomic and trait diversity, as well as the composition of the macroinvertebrate community, following a spatially nested design at three spatial scales of analysis: microhabitat (substratum patches), mesohabitat (pools vs. riffles), and macrohabitat (streams). In order to assess intrinsic seasonal variability in streams from the Mediterranean region, 20 Surber samples were taken from each stream according to meso- and microhabitat frequency in the wet and the dry season during 2010. Given the need for adaptation to specific hydrological conditions and the fact that microhabitats should encompass the niche requirements of particular taxa, we hypothesized that this spatial scale would have a greater influence on macroinvertebrate taxa composition and biological traits than the other two larger spatial scales in intermittent streams. We observed that patterns in the relative importance of variance components across hierarchical spatial scales changed with time because low flow or droughts altered both mesohabitat preva - lence and microhabitat composition. Our results confirm the importance of the microhabitat scale in I-P streams in the wet season but not in the dry one, when a loss of microhabitat diversity occurred. Stream-to-stream variability was more important in P and I-D streams. Our study also explored the relationships between traits and aquatic regimes. We found that aquatic macroinvertebrates inhabiting permanent streams exhibited traits related to the longer duration of life cycles in these rivers (e.g. large size of adult stages) and adaptations to flowing conditions (e.g. modes of aquatic dispersal), whereas aquatic macroinvertebrates inhabiting intermittent streams with summer pools had traits adapted to depositional conditions and ecological preferences for confined habitats (i.e. disconnected pools without flow). Finally, aquatic macroinvertebrates from intermittent streams with summer dry channels had adaptations conferring ability to survive periods with no water (e.g. modes of aerial dispersal, resistant stages). These results indicate that microhabitat conditions should not be neglected as they can play an important role in certain situations.
Note: Versió postprint del document publicat a: http://www.schweizerbart.de/papers/fal/detail/183/81054/Spatial_scale_effects_on_taxonomic_and_biological_
It is part of: Fundamental and Applied Limnology, 2013, vol. 183, num. 2, p. 89-105
URI: http://hdl.handle.net/2445/48431
ISSN: 1863-9135
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
Publicacions de projectes de recerca finançats per la UE

Files in This Item:
File Description SizeFormat 
629549.pdf918.82 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.