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Ciencias Marinas
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Ciencias Marinas
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Fish diversity associated with gas platforms: Evaluation of two underwater visual census techniques

Authors: CONSOLI P; AZZURRO E; SARA', Gianluca; FERRARO M; ANDALORO F.;

Fish diversity associated with gas platforms: Evaluation of two underwater visual census techniques

Abstract

Se estudiaron las comunidades ícticas asociadas con plataformas extractivas mediante dos técnicas de censos visuales submarinos: transectos y conteos de puntos móviles. Los datos se tomaron a cuatro profundidades en tres diferentes plataformas situadas en el Mar Jónico (Crotone, Italia). Se registraron un total de 25 especies de peces pertenecientes a 12 familias. Se observaron diferencias significativas entre ambos métodos de muestreo y las profundidades en cuanto a la estructura de la comunidad íctica, la riqueza de especies y la abundancia de peces. El promedio de peces registrado con el método de transectos siempre fue mayor que el registrado mediante puntos móviles, mientras que lo contrario sucedió para las abundancias medias. Las especies gregarias como Boops boops, Chromis chromis, Anthias anthias y Oblada melanura fueron las que más contribuyeron a las diferencias en la estructura poblacional. Ambas técnicas permitieron observar especies que no son comúnmente capturadas con artes de pesca. Cuando se utilizan las dos técnicas, éstas proporcionan información complementaria con respecto a las comunidades ícticas estrictamente asociadas con las estructuras de las plataformas. Fish assemblages associated with offshore platforms were surveyed using two underwater visual census techniques: strip transects and mobile point counts. Data were collected from four depth ranges at three platforms off Crotone, Italy (Ionian Sea). A total of 25 fish species belonging to 12 families were recorded for the three platforms. Significant differences between sampling methods and depth were observed in the fish assemblage structure, species richness and fish abundance. The mean number of species recorded with the strip transect method was always greater than that obtained with mobile point counts, whilst the opposite pattern was observed for mean abundances. Gregarious species such as Boops boops, Chromis chromis, Anthias anthias and Oblada melanura were responsible for most of the differences in the assemblage structure. According to our results, both methods allowed us to observe species that are not usually caught by means of fishing gear. When both census techniques are used, they provide complementary information about the fish assemblages strictly associated with the platform structures.

Country
Italy
Keywords

Settore BIO/07 - Ecologia, visual census methods; gas platforms; fish assemblage; diversity, QH301-705.5, Biology (General), visual census methods, fish assemblage, gas platforms, diversity

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
13
Average
Top 10%
Average
Green
gold