UNICA IRIS Institutional Research Information System
IRIS è il sistema di gestione integrata dei dati della ricerca (persone, progetti, pubblicazioni, attività) adottato dall'Università degli Studi di Cagliari dal mese di luglio 2015.
EnglishWe investigated the impact of fish farming on the benthic biota of 2 habitats (sea- grass meadows of Posidonia oceanica and non-vegetated soft bottoms), by examining in detail the nematode assemblages, and the effects of organic enrichment on their abundance, diversity (spe- cies richness and trophic diversity), community structure and individual size. All investigated faunal variables differed significantly between impact and control sediments, except for indi- vidual nematode biomass. Nematodes displayed reduced biodiversity beneath the investigated fish farms in both vegetated and non-vegetated habitats. The nematode genera Richtersia, Desmoscolex and Halalaimus were highly sensitive to biodeposition and disappeared almost com- pletely in farm sediments, whereas other genera such as Daptonema and Prochromadorella largely increased their relative abundance. The impact of biodeposition was investigated also in terms of K-dominance curves and functional variables (life strategies as maturity index, and func- tional [i.e. trophic] diversity) which showed that nematodes are very sensitive to this kind of envi- ronmental disturbance. Our results indicate that the analysis of nematode assemblage composi- tion, the life traits of the dominant species and the presence/disappearance of certain nematode species represent a reliable tool for monitoring the quality state of marine sediments exposed to fish-farm organic wastes.
| Titolo: | Nematode assemblage response to fish-farm impact in vegetated (Posidonia oceanica) and non‑vegetated habitats | |
| Autori: | ||
| Data di pubblicazione: | 2014 | |
| Rivista: | ||
| Abstract: | We investigated the impact of fish farming on the benthic biota of 2 habitats (sea- grass meadows of Posidonia oceanica and non-vegetated soft bottoms), by examining in detail the nematode assemblages, and the effects of organic enrichment on their abundance, diversity (spe- cies richness and trophic diversity), community structure and individual size. All investigated faunal variables differed significantly between impact and control sediments, except for indi- vidual nematode biomass. Nematodes displayed reduced biodiversity beneath the investigated fish farms in both vegetated and non-vegetated habitats. The nematode genera Richtersia, Desmoscolex and Halalaimus were highly sensitive to biodeposition and disappeared almost com- pletely in farm sediments, whereas other genera such as Daptonema and Prochromadorella largely increased their relative abundance. The impact of biodeposition was investigated also in terms of K-dominance curves and functional variables (life strategies as maturity index, and func- tional [i.e. trophic] diversity) which showed that nematodes are very sensitive to this kind of envi- ronmental disturbance. Our results indicate that the analysis of nematode assemblage composi- tion, the life traits of the dominant species and the presence/disappearance of certain nematode species represent a reliable tool for monitoring the quality state of marine sediments exposed to fish-farm organic wastes. | |
| Handle: | http://hdl.handle.net/11584/123663 | |
| Tipologia: | 1.1 Articolo in rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 064 Mirto et al Mar Environ Res 2010.pdf | versione editoriale | Open Access Visualizza/Apri |
http://hdl.handle.net/11584/123663
Copyright © 2022