Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species
In this paper we present a comparison between Remotely Operated Vehicle (ROV) and Agassiz trawling methods for sampling deep-water fauna in three submarine canyons of the Northwestern Mediterranean Sea and describe the behavioural reactions of fishes and crustacean decapods to ROV approach. 10 ROV dives, where 3583 individuals were observed and identified to species level, and 8 Agassiz trawls were carried out in a depth range of 750 to 1500 meters. As noticed in previous studies, abundances of fishes and decapod crustaceans were much higher in the ROV videos than in Agassiz trawl samples, as the latter are designed for the retrieval of benthic, less motile species in permanent contact with the bottom. In our observations fish abundance was one order of magnitude higher with ROV (4110.22 ind/km2) than with Agassiz trawl (350.88 ind/km2), whereas decapod crustaceans were six times more abundant in ROV videos (6362.40 ind/km2) than in Agassiz samples (1364.52 ind/km2).The behaviour of highly motile fishes was analysed in terms of stationary positioning over the seafloor and avoidance or attraction to ROV approach. The most frequently occurring fish species Coelorinchus mediterraneus, Nezumia aequalis, Bathypterois dubius, Lepidion lepidion, Trachyrincuss scabrus and Polyacanthonotus rissoanus did not react to the presence of the ROV in most cases (>50%). Only B. dubius (11%), L. lepidion (14.8%), P. rissoanus (41%) and T. scabrus (14.3%) reacted to ROV approach. More than 60% of less motile species, such as crustacean decapods, did not respond to ROV presence either. Only 33.3% of Geryon longipes, 36.2% of Munida spp. and 29.79% of Pagurus spp. were observed avoiding or defensively reacting to the ROV. The comparison of results obtained with ROV and trawl sampling is of ecological relevance since ROV can report observations in areas where trawling is technically unfeasible. The lack of reaction by most fish and crustacean decapod specimens further confirms that ROV surveying is an efficient technique to assess abundance and species composition in deep-sea waters for these motile species and questions trawl-based estimations.
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Format: | artículo biblioteca |
Language: | English |
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Elsevier
2016
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Subjects: | ROV observations, Agassiz trawl, Animal behaviour, Submarine canyon, Deep-sea, Northwestern Mediterranean Sea, |
Online Access: | http://hdl.handle.net/10261/133954 |
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dig-icm-es-10261-1339542019-03-26T10:40:52Z Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species Aymà Padrós, Anna Aguzzi, Jacopo Canals, Miquel Lastras, G. Bahamon, Nixon Mechó, Ariadna Company, Joan B. ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea In this paper we present a comparison between Remotely Operated Vehicle (ROV) and Agassiz trawling methods for sampling deep-water fauna in three submarine canyons of the Northwestern Mediterranean Sea and describe the behavioural reactions of fishes and crustacean decapods to ROV approach. 10 ROV dives, where 3583 individuals were observed and identified to species level, and 8 Agassiz trawls were carried out in a depth range of 750 to 1500 meters. As noticed in previous studies, abundances of fishes and decapod crustaceans were much higher in the ROV videos than in Agassiz trawl samples, as the latter are designed for the retrieval of benthic, less motile species in permanent contact with the bottom. In our observations fish abundance was one order of magnitude higher with ROV (4110.22 ind/km2) than with Agassiz trawl (350.88 ind/km2), whereas decapod crustaceans were six times more abundant in ROV videos (6362.40 ind/km2) than in Agassiz samples (1364.52 ind/km2).The behaviour of highly motile fishes was analysed in terms of stationary positioning over the seafloor and avoidance or attraction to ROV approach. The most frequently occurring fish species Coelorinchus mediterraneus, Nezumia aequalis, Bathypterois dubius, Lepidion lepidion, Trachyrincuss scabrus and Polyacanthonotus rissoanus did not react to the presence of the ROV in most cases (>50%). Only B. dubius (11%), L. lepidion (14.8%), P. rissoanus (41%) and T. scabrus (14.3%) reacted to ROV approach. More than 60% of less motile species, such as crustacean decapods, did not respond to ROV presence either. Only 33.3% of Geryon longipes, 36.2% of Munida spp. and 29.79% of Pagurus spp. were observed avoiding or defensively reacting to the ROV. The comparison of results obtained with ROV and trawl sampling is of ecological relevance since ROV can report observations in areas where trawling is technically unfeasible. The lack of reaction by most fish and crustacean decapod specimens further confirms that ROV surveying is an efficient technique to assess abundance and species composition in deep-sea waters for these motile species and questions trawl-based estimations. The present study has been carried out within the framework of the PROMARES - OASIS DEL MAR research grant funded to M.C. by Obra Social “la Caixa”, DOS MARES (ref. CTM2010-21810-C03-01), NUREIEV (ref. CTM2013-44598-R) and PERSEUS (grant agreement 287600) research projects funded by the Ministry of Science and Innovation of Spain, the Ministry of Economy and Competitiveness of Spain, and the European Commission, respectively. Peer reviewed 2016-06-23T06:39:28Z 2016-06-23T06:39:28Z 2016 artículo http://purl.org/coar/resource_type/c_6501 Deep-Sea Research Part I : 114: 149-159 (2016) 0967-0637 http://hdl.handle.net/10261/133954 10.1016/j.dsr.2016.05.013 en Postprint http://dx.doi.org/10.1016/j.dsr.2016.05.013 Sí open Elsevier |
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ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea |
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ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea Aymà Padrós, Anna Aguzzi, Jacopo Canals, Miquel Lastras, G. Bahamon, Nixon Mechó, Ariadna Company, Joan B. Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
description |
In this paper we present a comparison between Remotely Operated Vehicle
(ROV) and Agassiz trawling methods for sampling deep-water fauna in three submarine
canyons of the Northwestern Mediterranean Sea and describe the behavioural reactions
of fishes and crustacean decapods to ROV approach. 10 ROV dives, where 3583
individuals were observed and identified to species level, and 8 Agassiz trawls were
carried out in a depth range of 750 to 1500 meters. As noticed in previous
studies, abundances of fishes and decapod crustaceans were much higher in the ROV
videos than in Agassiz trawl samples, as the latter are designed for the retrieval of
benthic, less motile species in permanent contact with the bottom. In our observations
fish abundance was one order of magnitude higher with ROV (4110.22 ind/km2) than
with Agassiz trawl (350.88 ind/km2), whereas decapod crustaceans were six times more
abundant in ROV videos (6362.40 ind/km2) than in Agassiz samples (1364.52 ind/km2).The behaviour of highly motile fishes was analysed in terms of stationary
positioning over the seafloor and avoidance or attraction to ROV approach. The most
frequently occurring fish species Coelorinchus mediterraneus, Nezumia aequalis,
Bathypterois dubius, Lepidion lepidion, Trachyrincuss scabrus and Polyacanthonotus
rissoanus did not react to the presence of the ROV in most cases (>50%). Only B.
dubius (11%), L. lepidion (14.8%), P. rissoanus (41%) and T. scabrus (14.3%) reacted
to ROV approach. More than 60% of less motile species, such as crustacean decapods,
did not respond to ROV presence either. Only 33.3% of Geryon longipes, 36.2% of
Munida spp. and 29.79% of Pagurus spp. were observed avoiding or defensively
reacting to the ROV.
The comparison of results obtained with ROV and trawl sampling is of
ecological relevance since ROV can report observations in areas where trawling is
technically unfeasible. The lack of reaction by most fish and crustacean decapod
specimens further confirms that ROV surveying is an efficient technique to assess
abundance and species composition in deep-sea waters for these motile species and
questions trawl-based estimations. |
format |
artículo |
topic_facet |
ROV observations Agassiz trawl Animal behaviour Submarine canyon Deep-sea Northwestern Mediterranean Sea |
author |
Aymà Padrós, Anna Aguzzi, Jacopo Canals, Miquel Lastras, G. Bahamon, Nixon Mechó, Ariadna Company, Joan B. |
author_facet |
Aymà Padrós, Anna Aguzzi, Jacopo Canals, Miquel Lastras, G. Bahamon, Nixon Mechó, Ariadna Company, Joan B. |
author_sort |
Aymà Padrós, Anna |
title |
Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
title_short |
Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
title_full |
Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
title_fullStr |
Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
title_full_unstemmed |
Comparison between ROV video and Agassiz trawl methods for sampling deep water fauna of submarine canyons in the Northwestern Mediterranean Sea with observations on behavioural reactions of target species |
title_sort |
comparison between rov video and agassiz trawl methods for sampling deep water fauna of submarine canyons in the northwestern mediterranean sea with observations on behavioural reactions of target species |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://hdl.handle.net/10261/133954 |
work_keys_str_mv |
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