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| Titel |
Unravelling the environmental drivers of deep-sea nematode biodiversity and its relation with carbon mineralisation along a longitudinal primary productivity gradient |
| VerfasserIn |
E. Pape, T. N. Bezerra, D. O. B. Jones, A. Vanreusel |
| 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. 5 ; Nr. 10, no. 5 (2013-05-08), S.3127-3143 |
| Datensatznummer |
250018242
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| Publikation (Nr.) |
 copernicus.org/bg-10-3127-2013.pdf |
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| Zusammenfassung |
| Alongside a primary productivity gradient between the Galicia Bank region in
the Northeast Atlantic and the more oligotrophic eastern Mediterranean Basin,
we investigated the bathymetric (1200–3000 m) and longitudinal variation in
several measures for nematode taxon (Shannon–Wiener genus diversity,
expected genus richness and generic evenness) and functional diversity
(trophic diversity, diversity of life history strategies, biomass diversity
and phylogenetic diversity). Our goals were to establish the form of the
relation between diversity and productivity (measured as seafloor particulate
organic carbon or POC flux), and to verify the positive and negative effect
of sediment particle size diversity (SED) and the seasonality in POC flux
(SVI), respectively, on diversity, as observed for other oceanographic
regions and taxa. In addition, we hypothesised that higher taxon diversity is
associated with higher functional diversity, which in turn stimulates
nematode carbon mineralisation rates (determined from biomass-dependent
respiration estimates). Taxon diversity related positively to seafloor POC
flux. Phylogenetic diversity (measured as average taxonomic distinctness) was
affected negatively by the magnitude and variability in POC flux, and
positively by SED. The latter also showed an inverse relation with trophic
diversity. Accounting for differences in total biomass between samples, we
observed a positive linear relation between taxon diversity and carbon
mineralisation in nematode communities. We could, however, not identify the
potential mechanism through which taxon diversity may promote this ecosystem
function since none of the functional diversity indices related to both
diversity and nematode respiration. The present results suggest potential
effects of climate change on deep-sea ecosystem functioning, but further also
emphasise the need for a better understanding of nematode functions and their
response to evolutionary processes. |
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