Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters

Abstract Seabirds are known to concentrate on prey patches or at predators aggregations standing for potential feeding opportunities. They may search for prey using olfaction or by detecting visually feeding con-specifics and sub-surface predators, or even boats. Thus, they might form a foraging net...

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Autores principales:	Camille Assali, Nicolas Bez, Yann Tremblay
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/64a93147dd8842f696061d9b9ff9ce7c
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spelling	oai:doaj.org-article:64a93147dd8842f696061d9b9ff9ce7c2021-12-02T12:32:18ZSeabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters10.1038/s41598-017-07480-62045-2322https://doaj.org/article/64a93147dd8842f696061d9b9ff9ce7c2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07480-6https://doaj.org/toc/2045-2322Abstract Seabirds are known to concentrate on prey patches or at predators aggregations standing for potential feeding opportunities. They may search for prey using olfaction or by detecting visually feeding con-specifics and sub-surface predators, or even boats. Thus, they might form a foraging network. We hypothesized that conditionally to the existence of a foraging network, the visual detection ability of seabirds should have a bearing on their medium-scale distribution at sea. Using a fishing-boat radar to catch the instantaneous distribution of seabirds groups within 30 km around the vessel, we conducted a spatial clustering of the seabird-echoes. We found 7,657 clusters (i.e. aggregations of echoes), lasting less than 15 minutes and measuring 9.2 km in maximum length (median). Distances between seabirds groups within clusters showed little variation (median: 2.1 km; CV: 0.5), while area varied largely (median: 21.9 km2; CV: 0.8). Given existing data on seabirds’ reaction distances to boats or other marine predators, we suggest that these structures may represent active foraging sequences of seabirds spreading themselves in space such as to possibly cue on each others. These seabird clusters were not previously described and are size compatible with the existence of a foraging network.Camille AssaliNicolas BezYann TremblayNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Camille Assali Nicolas Bez Yann Tremblay Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
description	Abstract Seabirds are known to concentrate on prey patches or at predators aggregations standing for potential feeding opportunities. They may search for prey using olfaction or by detecting visually feeding con-specifics and sub-surface predators, or even boats. Thus, they might form a foraging network. We hypothesized that conditionally to the existence of a foraging network, the visual detection ability of seabirds should have a bearing on their medium-scale distribution at sea. Using a fishing-boat radar to catch the instantaneous distribution of seabirds groups within 30 km around the vessel, we conducted a spatial clustering of the seabird-echoes. We found 7,657 clusters (i.e. aggregations of echoes), lasting less than 15 minutes and measuring 9.2 km in maximum length (median). Distances between seabirds groups within clusters showed little variation (median: 2.1 km; CV: 0.5), while area varied largely (median: 21.9 km2; CV: 0.8). Given existing data on seabirds’ reaction distances to boats or other marine predators, we suggest that these structures may represent active foraging sequences of seabirds spreading themselves in space such as to possibly cue on each others. These seabird clusters were not previously described and are size compatible with the existence of a foraging network.
format	article
author	Camille Assali Nicolas Bez Yann Tremblay
author_facet	Camille Assali Nicolas Bez Yann Tremblay
author_sort	Camille Assali
title	Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
title_short	Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
title_full	Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
title_fullStr	Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
title_full_unstemmed	Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
title_sort	seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/64a93147dd8842f696061d9b9ff9ce7c
work_keys_str_mv	AT camilleassali seabirddistributionpatternsobservedwithfishingvesselsradarrevealpreviouslyundescribedsubmesoscaleclusters AT nicolasbez seabirddistributionpatternsobservedwithfishingvesselsradarrevealpreviouslyundescribedsubmesoscaleclusters AT yanntremblay seabirddistributionpatternsobservedwithfishingvesselsradarrevealpreviouslyundescribedsubmesoscaleclusters
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Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters

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