Density- and size-dependent mortality in fish early life stages

The importance of survival and growth variations early in life for population dynamics depends on the degrees of compensatory density dependence and size dependence in survival at later life stages. Quantifying density- and size-dependent mortality at different juvenile stages is therefore important...

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Bibliographic Details
Published in:Fish and Fisheries
Main Authors: Stige, Leif Christian, Rogers, Lauren A., Neuheimer, Anna B., Hunsicker, Mary E., Yaragina, Natalia A., Ottersen, Geir, Ciannelli, Lorenzo, Langangen, Oystein, Durant, Joel M.
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Bayesian state-space analysis
comparative analysis
growth-survival relationships
population regulation
predation
recruitment dynamics
POLLOCK THERAGRA-CHALCOGRAMMA
HADDOCK MELANOGRAMMUS-AEGLEFINUS
CAPELIN MALLOTUS-VILLOSUS
NORTHEAST ARCTIC COD
EASTERN BERING-SEA
LENGTH-AT-AGE
WALLEYE POLLOCK
CLASS STRENGTH
TIME-SERIES
GADUS-MORHUA
growth–survival relationships
Arctic
Bering Sea
Arctic cod
Gadus morhua
Northeast Arctic cod
Theragra chalcogramma
Online Access:https://pure.au.dk/portal/en/publications/992a42b1-bc6c-48a4-8a11-e50592de0f09
https://doi.org/10.1111/faf.12391
https://pure.au.dk/ws/files/194913165/faf.12391.pdf
Description
Summary:The importance of survival and growth variations early in life for population dynamics depends on the degrees of compensatory density dependence and size dependence in survival at later life stages. Quantifying density- and size-dependent mortality at different juvenile stages is therefore important to understand and potentially predict the recruitment to the population. We applied a statistical state-space modelling approach to analyse time series of abundance and mean body size of larval and juvenile fish. The focus was to identify the importance of abundance and body size for growth and survival through successive larval and juvenile age intervals, and to quantify how the dynamics propagate through the early life to influence recruitment. We thus identified both relevant ages and mechanisms (i.e. density dependence and size dependence in survival and growth) linking recruitment variability to early life dynamics. The analysis was conducted on six economically and ecologically important fish populations from cold temperate and sub-arctic marine ecosystems. Our results underscore the importance of size for survival early in life. The comparative analysis suggests that size-dependent mortality and density-dependent growth frequently occur at a transition from pelagic to demersal habitats, which may be linked to competition for suitable habitat. The generality of this hypothesis warrants testing in future research.

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