The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.

Ecological indicators for monitoring strategies are expected to combine three major characteristics: ecological significance, statistical credibility, and cost-effectiveness. Strategies based on stranding networks rank highly in cost-effectiveness, but their ecological significance and statistical c...

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Autores principales:	Helene Peltier, Hans J Baagøe, Kees C J Camphuysen, Richard Czeck, Willy Dabin, Pierre Daniel, Rob Deaville, Jan Haelters, Thierry Jauniaux, Lasse F Jensen, Paul D Jepson, Guido O Keijl, Ursula Siebert, Olivier Van Canneyt, Vincent Ridoux
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/06ef7f5925a042129dc598983fb1b1f3
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spelling	oai:doaj.org-article:06ef7f5925a042129dc598983fb1b1f32021-11-18T07:48:37ZThe stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.1932-620310.1371/journal.pone.0062180https://doaj.org/article/06ef7f5925a042129dc598983fb1b1f32013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23614031/?tool=EBIhttps://doaj.org/toc/1932-6203Ecological indicators for monitoring strategies are expected to combine three major characteristics: ecological significance, statistical credibility, and cost-effectiveness. Strategies based on stranding networks rank highly in cost-effectiveness, but their ecological significance and statistical credibility are disputed. Our present goal is to improve the value of stranding data as population indicator as part of monitoring strategies by constructing the spatial and temporal null hypothesis for strandings. The null hypothesis is defined as: small cetacean distribution and mortality are uniform in space and constant in time. We used a drift model to map stranding probabilities and predict stranding patterns of cetacean carcasses under H0 across the North Sea, the Channel and the Bay of Biscay, for the period 1990-2009. As the most common cetacean occurring in this area, we chose the harbour porpoise Phocoena phocoena for our modelling. The difference between these strandings expected under H0 and observed strandings is defined as the stranding anomaly. It constituted the stranding data series corrected for drift conditions. Seasonal decomposition of stranding anomaly suggested that drift conditions did not explain observed seasonal variations of porpoise strandings. Long-term stranding anomalies increased first in the southern North Sea, the Channel and Bay of Biscay coasts, and finally the eastern North Sea. The hypothesis of changes in porpoise distribution was consistent with local visual surveys, mostly SCANS surveys (1994 and 2005). This new indicator could be applied to cetacean populations across the world and more widely to marine megafauna.Helene PeltierHans J BaagøeKees C J CamphuysenRichard CzeckWilly DabinPierre DanielRob DeavilleJan HaeltersThierry JauniauxLasse F JensenPaul D JepsonGuido O KeijlUrsula SiebertOlivier Van CanneytVincent RidouxPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 4, p e62180 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Helene Peltier Hans J Baagøe Kees C J Camphuysen Richard Czeck Willy Dabin Pierre Daniel Rob Deaville Jan Haelters Thierry Jauniaux Lasse F Jensen Paul D Jepson Guido O Keijl Ursula Siebert Olivier Van Canneyt Vincent Ridoux The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
description	Ecological indicators for monitoring strategies are expected to combine three major characteristics: ecological significance, statistical credibility, and cost-effectiveness. Strategies based on stranding networks rank highly in cost-effectiveness, but their ecological significance and statistical credibility are disputed. Our present goal is to improve the value of stranding data as population indicator as part of monitoring strategies by constructing the spatial and temporal null hypothesis for strandings. The null hypothesis is defined as: small cetacean distribution and mortality are uniform in space and constant in time. We used a drift model to map stranding probabilities and predict stranding patterns of cetacean carcasses under H0 across the North Sea, the Channel and the Bay of Biscay, for the period 1990-2009. As the most common cetacean occurring in this area, we chose the harbour porpoise Phocoena phocoena for our modelling. The difference between these strandings expected under H0 and observed strandings is defined as the stranding anomaly. It constituted the stranding data series corrected for drift conditions. Seasonal decomposition of stranding anomaly suggested that drift conditions did not explain observed seasonal variations of porpoise strandings. Long-term stranding anomalies increased first in the southern North Sea, the Channel and Bay of Biscay coasts, and finally the eastern North Sea. The hypothesis of changes in porpoise distribution was consistent with local visual surveys, mostly SCANS surveys (1994 and 2005). This new indicator could be applied to cetacean populations across the world and more widely to marine megafauna.
format	article
author	Helene Peltier Hans J Baagøe Kees C J Camphuysen Richard Czeck Willy Dabin Pierre Daniel Rob Deaville Jan Haelters Thierry Jauniaux Lasse F Jensen Paul D Jepson Guido O Keijl Ursula Siebert Olivier Van Canneyt Vincent Ridoux
author_facet	Helene Peltier Hans J Baagøe Kees C J Camphuysen Richard Czeck Willy Dabin Pierre Daniel Rob Deaville Jan Haelters Thierry Jauniaux Lasse F Jensen Paul D Jepson Guido O Keijl Ursula Siebert Olivier Van Canneyt Vincent Ridoux
author_sort	Helene Peltier
title	The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
title_short	The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
title_full	The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
title_fullStr	The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
title_full_unstemmed	The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.
title_sort	stranding anomaly as population indicator: the case of harbour porpoise phocoena phocoena in north-western europe.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/06ef7f5925a042129dc598983fb1b1f3
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The stranding anomaly as population indicator: the case of harbour porpoise Phocoena phocoena in North-Western Europe.

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