Benthic input rates predict seagrass (Posidonia oceanica) fish farm-induced decline

Show simple item record Díaz-Almela, E. Marbà, N. Álvarez, E. Santiago, R. Holmer, M. Grau, A. Mirto, S. Danovaro, R. Petrou, A. Argyrou, M. Karakassis, I. Duarte, C.M. 2019-07-15T10:16:58Z 2019-07-15T10:16:58Z
dc.description.abstract Fish farms represent a growing source of anthropogenic disturbance to benthic communities, and efficient predictors of such impacts are urgently needed. We explored the effects of fish farm benthic organic and nutrient inputs on the population dynamics of a key seagrass species (Posidonia oceanica) in four Mediterranean deep meadows adjacent to sea bream and sea bass farms. We performed two annual plant censuses on permanent plots at increasing distance from farms and measured benthic sedimentation rates around plots. High shoot mortality rates were recorded near the cages, up to 20 times greater than at control sites. Recruitment rates increased in variability but could not compensate mortality, leading to rapid seagrass decline within the first 100 m from cages. Seagrass mortality increased with total sedimentation rates (K=0.55, p<0.0002), and with organic matter (K=0.50, p=0.001), total nitrogen (K=0.46, p=0.002) and total phosphorus (K=0.56, p<3.10(-5)) inputs. P. oceanica decline accelerated above a phosphorus loading threshold of 50mg m(-2)day(-1). Phosphorus benthic sedimentation rate seems a powerful predictor of seagrass mortality from fish farming. Coupling direct measurements of benthic
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dc.relation.isformatof Versió postprint del document publicat a:
dc.relation.ispartof Marine Pollution Bulletin, 2008, vol. 56, num. 7, p. 1332-1342
dc.subject.classification 574 - Ecologia general i biodiversitat
dc.subject.other 574 - General ecology and biodiversity Biocoenology. Hydrobiology. Biogeography
dc.title Benthic input rates predict seagrass (Posidonia oceanica) fish farm-induced decline
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/acceptedVersion 2019-07-15T10:16:58Z
dc.rights.accessRights info:eu-repo/semantics/openAccess

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