Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks

Ecological monitoring programmes should provide precise data to inform management, but the data quality is often limited by methodological challenges and the need for cost-effective sampling. Parasite infestations are particularly challenging to monitor due to complex interactions among hosts, paras...

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Autores principales:	IP Helland, I Uglem, PA Jansen, OH Diserud, PA Bjørn, B Finstad
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2015
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/fdeb982ad3ad428db6d5a3d4b6529821
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spelling	oai:doaj.org-article:fdeb982ad3ad428db6d5a3d4b65298212021-11-16T09:44:17ZStatistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks1869-215X1869-753410.3354/aei00155https://doaj.org/article/fdeb982ad3ad428db6d5a3d4b65298212015-12-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v7/n3/p267-280/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Ecological monitoring programmes should provide precise data to inform management, but the data quality is often limited by methodological challenges and the need for cost-effective sampling. Parasite infestations are particularly challenging to monitor due to complex interactions among hosts, parasites and the environment. In Norway, salmon lice infestations on wild salmonid fish have been monitored since 1992 to survey the potential transmission between farmed and wild salmonids. Here, we compared spatiotemporal variation in salmon lice levels with variations in local fjord conditions, including salinity, temperature and infestation pressure from salmon farms (measured as mean abundance of mature female lice × number of farmed fish). We tested 3 different measures of infestation with different statistical properties. Our results confirm that, even after correcting for temperature and salinity effects, infestation pressure from salmon farms significantly increases the probability of lice infestation in wild salmonids. The probability of infestation increases with fish body length, salmon farm infestation pressure and temperature, and decreases with increasing freshwater influence. Furthermore, we found a significant interaction between temperature and infestation pressure from salmon farms. When the infestation pressure from farms is low, temperature has a strong increasing effect on the probability of infestation, but as the infestation pressure from farms increases, temperature gradually becomes less important. The exact results vary somewhat depending on the measure of lice infestations used, but the same trend can be seen in all models. We discuss the statistical and biological complexities that make monitoring of salmon lice in wild populations challenging.IP HellandI UglemPA JansenOH DiserudPA BjørnB FinstadInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 7, Iss 3, Pp 267-280 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 IP Helland I Uglem PA Jansen OH Diserud PA Bjørn B Finstad Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
description	Ecological monitoring programmes should provide precise data to inform management, but the data quality is often limited by methodological challenges and the need for cost-effective sampling. Parasite infestations are particularly challenging to monitor due to complex interactions among hosts, parasites and the environment. In Norway, salmon lice infestations on wild salmonid fish have been monitored since 1992 to survey the potential transmission between farmed and wild salmonids. Here, we compared spatiotemporal variation in salmon lice levels with variations in local fjord conditions, including salinity, temperature and infestation pressure from salmon farms (measured as mean abundance of mature female lice × number of farmed fish). We tested 3 different measures of infestation with different statistical properties. Our results confirm that, even after correcting for temperature and salinity effects, infestation pressure from salmon farms significantly increases the probability of lice infestation in wild salmonids. The probability of infestation increases with fish body length, salmon farm infestation pressure and temperature, and decreases with increasing freshwater influence. Furthermore, we found a significant interaction between temperature and infestation pressure from salmon farms. When the infestation pressure from farms is low, temperature has a strong increasing effect on the probability of infestation, but as the infestation pressure from farms increases, temperature gradually becomes less important. The exact results vary somewhat depending on the measure of lice infestations used, but the same trend can be seen in all models. We discuss the statistical and biological complexities that make monitoring of salmon lice in wild populations challenging.
format	article
author	IP Helland I Uglem PA Jansen OH Diserud PA Bjørn B Finstad
author_facet	IP Helland I Uglem PA Jansen OH Diserud PA Bjørn B Finstad
author_sort	IP Helland
title	Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
title_short	Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
title_full	Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
title_fullStr	Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
title_full_unstemmed	Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
title_sort	statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks
publisher	Inter-Research
publishDate	2015
url	https://doaj.org/article/fdeb982ad3ad428db6d5a3d4b6529821
work_keys_str_mv	AT iphelland statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks AT iuglem statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks AT pajansen statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks AT ohdiserud statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks AT pabjørn statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks AT bfinstad statisticalandecologicalchallengesofmonitoringparasiticsalmonliceinfestationsinwildsalmonidfishstocks
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Statistical and ecological challenges of monitoring parasitic salmon lice infestations in wild salmonid fish stocks

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