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dc.contributor.authorCondal, Fernando
dc.contributor.authorAguzzi, Jacopo
dc.contributor.authorSardà Amills, Francesc
dc.contributor.authorNogueras Cervera, Marc
dc.contributor.authorCadena Muñoz, Francisco Javier
dc.contributor.authorManuel Lázaro, Antonio
dc.contributor.otherUniversitat Politècnica de Catalunya. Centre de Desenvolupament Tecnològic de Sistemes d'Adquisició Remota i Tractament de la Informació
dc.identifier.citationCondal, F. [et al.]. Cabled video-observatory monitoring of seasonal rhythms in a Mediterranean coastal fish community. 2020.
dc.description.abstractThe obtention of time series in the structure and biodiversity of marine populations is of great interest in spite of increasing anthropic perturbations of direct type (e.g. fishing or littering) or of more indirect nature as the climate change. However, the lack of reliable and long-lasting sampling/observational technology deeply constrains our understanding of ecosystem functioning and its response to any perturbation. For the first time, we continuously monitored the seasonal variation in individuals for different fish species within a Western Mediterranean marine protected area by means of the cabled video-observatory OBSEA (20 m depth). During 1 year (from June 2009 to July 2010), frames for fish visual counting were acquired by a digital still camera portraying two different reef and water locations, at each daylight hour within the two central weeks of each month. In images we reported the total of counted fishes, the total of fishes per species, the number of species, the Shannon Diversity and Mean Trophic Level. A comprehensive faunistic list including not only fishes but also diving seabirds was obtained. Significantly higher number of species and their abundances were observed in images including the artificial reef location versus those of the water column. A seasonal variability was observed in Diplodus vulgaris, Chromis chromis, Diplodus sargus, Diplodus annularis, Dentex dentex, Spondyliosoma cantharus, Symphodus melanocercus, having this phenomenon an effect on monthly Shannon Diversity Index estimates. The seasonal variation of these species was not linked to their Trophic Level. Moreover, a weak intra-day (i.e. morning versus afternoon) variation in fish counts was also reported, being not significant. Present results indicate that cabled video-observatories are a reliable and powerful method to monitor seasonal changes in species composition and biodiversity, potentially providing important data for the modelling of marine ecosystem functioning.
dc.description.sponsorshipThis research was funded by ESONET (European Seas Observatory NETwork; Framework Program-FP7 Infrastructures-2005-Global-4, ESONET 036851-2), EMSO (European Multidisciplinary Seafloor Observation; Framework Program-FP7 Infrastructures2007-1, Proposal 211816), RITFIM (CTM2010-16274), and ACI2009-0983 (Operatividad laboratorio Submarino OBSEA). Researchers from the CSIC and UPC are members of the Associated Unit Tecnoterra. J. Aguzzi is a Postdoctoral Fellow of the Ramón y Cajal Program (MICINN).
dc.format.extent12 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal::Processament de la imatge i del senyal vídeo
dc.subjectÀrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida::Biologia
dc.subject.lcshMediterranean-type ecosystems
dc.subject.lcshUnderwater imaging systems
dc.subject.lcshFish populations -- Mediterranean Sea
dc.subject.lcshBiodiversity research
dc.subject.lcshMarine species diversity
dc.subject.otherImage analysis
dc.subject.otherFish community
dc.subject.otherCabled video-observatory
dc.subject.otherSeasonal rhythms
dc.subject.otherArtificial reef
dc.subject.otherIntra-day variation
dc.subject.otherDiplodus vulgaris
dc.subject.otherChromis chromis
dc.subject.otherDiplodus sargus
dc.subject.otherDiplodus annularis
dc.subject.otherDentex dentex
dc.subject.otherSpondyliosoma cantharus
dc.subject.otherSymphodus melanocercus
dc.titleCabled video-observatory monitoring of seasonal rhythms in a Mediterranean coastal fish community
dc.typeExternal research report
dc.subject.lemacComunicacions subacuàtiques
dc.subject.lemacEcosistemes mediterranis
dc.subject.lemacFons marins -- Investigació
dc.contributor.groupUniversitat Politècnica de Catalunya. SARTI-MAR - Sistemes d'Adquisició Remota de dades i Tractament de la Informació en el Medi Marí
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/211816/EU/European Multidisciplinary Seafloor Observation/EMSO
local.citation.authorCondal, F.; Aguzzi, J.; Sardà, F.; Nogueras, M.; Cadena-Muñoz, F.J.; Manuel, A.

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