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| Titel |
Nematode diversity patterns at different spatial scales in bathyal sediments of the Mediterranean Sea |
| VerfasserIn |
S. Bianchelli, C. Gambi, M. Mea, A. Pusceddu, R. Danovaro |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 8 ; Nr. 10, no. 8 (2013-08-15), S.5465-5479 |
| Datensatznummer |
250085297
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| Publikation (Nr.) |
 copernicus.org/bg-10-5465-2013.pdf |
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| Zusammenfassung |
| Understanding biodiversity patterns and how they are driven at different
spatial scales is a crucial issue in ecological studies. This is particularly
evident for the deep sea, the largest biome of the biosphere, where
information on the scales of spatial variation is very scant. Here, we
investigated deep-sea nematodes species richness, turnover and functional
diversity, and life strategies at different spatial scales (from local to
macro-regional) to identify the factors that shape regional (γ) and
macro-regional (ε) deep-sea diversity. This study was conducted
in several deep-sea habitats (canyons, open slopes, deep-water corals, and
bathyal plains) over > 2000 km across the whole Mediterranean Basin, at a
bathymetric range comprised between ca. 600 and 1300 m. Our results indicate
that the patterns of local (α) diversity across the deep Mediterranean
follow the gradients of the trophic conditions, which decrease from the
western to the eastern basins. For all of the sites and habitats, the
α diversity is generally low. Conversely, the turnover diversity
changes significantly among habitats (β diversity) and between regions
(δ diversity), showing values of dissimilarity (based on species
presence/absence matrixes) between 59 and 90% for
β diversity and between 81 and 89% for δ diversity.
This suggests that patterns and values of γ and
ε diversities in the deep Mediterranean Sea are
related to turnover diversity among habitats and between regions (β
and δ diversities), rather than to the local biodiversity
(α diversity). These results indicate also that the differences in
β and δ diversities are even more important than those in
α diversity for the comprehension of the drivers of biodiversity in
the deep Mediterranean Sea. We conclude that the presence of different
habitats and gradients in environmental conditions, by promoting a high
turnover diversity across the Mediterranean Sea, may play a crucial role in
the levels of γ diversity of deep-sea nematodes. |
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