Detecting population regulation of winter flounder from noisy data.

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Titel: Detecting population regulation of winter flounder from noisy data.
Autoren: Langan, Joseph A., Collie, Jeremy S., Minto, Cóilín
Quelle: Canadian Journal of Fisheries & Aquatic Sciences; 2022, Vol. 79 Issue 7, p1097-1108, 12p
Schlagwörter: FLATFISHES, MARINE fishes, WINTER, SIZE of fishes, DEMOGRAPHIC change, FACTOR analysis, FISH larvae
Geografische Kategorien: NARRAGANSETT Bay (R.I.), RHODE Island
Abstract (English): Year-class size of marine fish is thought to be determined during the first year of life, with density-dependent mortality occuring during the larval or juvenile stages. However, investigations of such dynamics are often limited by data availability. To test this paradigm for winter flounder (Pseudopleuronectes americanus) in Narragansett Bay, Rhode Island, the abundances of 29 year classes moving through seven life stages were analyzed with a novel extension of key-factor analysis. Evidence of density dependence was identified between the egg and July young-of-the-year stages and high process-error variance was detected throughout the life cycle, suggesting year-class size is not fully determined until age-2. However, the first summer appeared to be a critical life stage for winter flounder, during which high temperatures, hypoxia, and predator abundance contributed to increased mortality rates behind a long-term population decline. Due to its general data requirements, the key-factor analysis method developed here may be applied to other aquatic populations to identify the impacts of external stressors at particular life stages and the degree to which they are compensated by density-dependent processes. [ABSTRACT FROM AUTHOR]
Abstract (French): L'effectif des classes d'âge de poissons marins serait déterminé durant la première année de vie, tandis que la mortalité densité-dépendante a lieu durant les stades larvaire et juvénile. Toutefois, les études sur ce type de dynamique sont limitées par la disponibilité de données. Pour vérifier ce paradigme pour la plie rouge (Pseudopleuronectes americanus) dans la baie de Narragansett (Rhode Island, États-Unis), nous avons analysé l'abondance de 29 classes d'âge au fil de sept étapes du cycle biologique à l'aide d'une nouvelle extension d'analyse par facteurs clés. Des indices de densité-dépendance sont relevés entre les stades œuf et jeune de l'année en juillet, et une forte variance de l'erreur de traitement durant tout le cycle biologique est décelée, donnant à penser que l'effectif de la classe d'âge n'est pas entièrement établi avant 2 ans. Toutfois, le premier été semble être une étape critique du cycle biologique pour la plie rouge, durant laquelle des températures élevées, l'hypoxie et l'abondance des prédateurs contribuent à accroître les taux de mortalité à l'origine d'un long déclin démographique. En raison de ses exigences générales en matière de données, la méthode d'analyse par facteurs clés présentée pourrait être appliquée à d'autres populations aquatiques pour cerner les impacts de facteurs de stress externes à des étapes précises du cycle biologique et déterminer dans quelle mesure ces impacts sont compensés par des processus de densité-dépendence. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
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Datenbank: Complementary Index
Beschreibung
Abstract:Year-class size of marine fish is thought to be determined during the first year of life, with density-dependent mortality occuring during the larval or juvenile stages. However, investigations of such dynamics are often limited by data availability. To test this paradigm for winter flounder (Pseudopleuronectes americanus) in Narragansett Bay, Rhode Island, the abundances of 29 year classes moving through seven life stages were analyzed with a novel extension of key-factor analysis. Evidence of density dependence was identified between the egg and July young-of-the-year stages and high process-error variance was detected throughout the life cycle, suggesting year-class size is not fully determined until age-2. However, the first summer appeared to be a critical life stage for winter flounder, during which high temperatures, hypoxia, and predator abundance contributed to increased mortality rates behind a long-term population decline. Due to its general data requirements, the key-factor analysis method developed here may be applied to other aquatic populations to identify the impacts of external stressors at particular life stages and the degree to which they are compensated by density-dependent processes. [ABSTRACT FROM AUTHOR]
ISSN:0706652X
DOI:10.1139/cjfas-2021-0004