Population growth across heterogeneous environments: effects of harvesting and age structure

Population growth is affected by several factors such as climate, species interaction and harvesting pressure. However, additional complexity can arise if fishing increases the sensitivity to environmental variability. To predict the effects of fisheries and climate on marine populations, there is a...

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Bibliographic Details
Published in:Marine Ecology Progress Series
Main Authors: Durant, J.M., Hidalgo, Manuel, Rouyer, T.A., Hjermann, D.Ø., Ciannelli, Lorenzo, Eikeset, Anne Maria, Yaragina, Natalia, Stenseth, Nils Christian
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
Centro Oceanográfico de Baleares
Barents Sea
Pesquerías
Mediterranean Sea
Bering Sea
Cod
Gadus morhua
European hake
Merluccius merluccius
Pollock
Theragra chalcogramma
Leslie matrix
Fisheries
Arctic
Arctic Ocean
Gulf of Alaska
Hake
Norwegian Sea
Arctic cod
North Atlantic
Northeast Arctic cod
Alaska
Online Access:http://hdl.handle.net/10508/8586
http://hdl.handle.net/10261/323814
https://doi.org/10.3354/meps10308
Description
Summary:Population growth is affected by several factors such as climate, species interaction and harvesting pressure. However, additional complexity can arise if fishing increases the sensitivity to environmental variability. To predict the effects of fisheries and climate on marine populations, there is a need for improved understanding of how they affect key ecological processes such as population growth. In this study, we used a comparative approach investigating commercially fished species across different ecosystems: the Norwegian Sea−Barents Sea (Northeast Arctic cod), the North Sea (North Sea cod), the Atlantic Ocean (European hake), the Mediterranean Sea (European hake), and the Gulf of Alaska and Bering Sea (walleye pollock). Our objective was to compare the effects of commercial fisheries, age structure and environmental variability on population growth rate. We show that although all stocks experienced a decline in abundance, only 3 of them showed a concomitant decreasing trend in generation time (South Atlantic hake, North Atlantic hake and Northeast Arctic cod), suggesting a fishing-induced erosion in their age structure. Intra-specific analysis shows that changes in generation time triggered an increase in the relative contribution of recruitment to population growth. Furthermore, the contribution from recruitment to population growth changes due to large-scale climate indices or regional-scale environmental covariates, such as sea temperature. This study illustrates how and where the interaction between large-scale ecological patterns and regional/short-scale processes are important for designing management regulations Sí

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