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Combining hydrographical particles-tracking models with spatial analyses to evaluate spatial dynamics of cod larvae and 0-group in the Barents Sea

Hidalgo, Manuel; Gusdal, Yvonne; Dingsør, Gjert Endre; Ciannelli, Lorenzo; Hjermann, Dag Ø.; Ottersen, Geir; Stige, Leif Christian; Fossum, Ingerid; Melsom, Arne; Stenseth, Nils Christian
Working paper
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URI
http://hdl.handle.net/11250/102936
Date
2009
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Abstract
Recruitment ecology of cod has been an important focus within the framework of GLOBEC.

A large part of this work focused on understanding the spatiotemporal component of cod

populations. For the early pelagic life stages, studies based on an individual-based platform

have provided highly valuable insights combining oceanographic, behavioural and modelling

approaches. The spatial modelling of observational data often fails to include densitydependent

covariates, which for early pelagic life stages, originate from the combination of

circulation patterns and eggs coming from the spawning aggregations. We performed this task

combining a hydrographical particle-tracking model with spatial statistical analyses to

investigate the relative contribution of hydrographical variables on the spatial distribution of

cod larvae in the Barents Sea under two short-term climatic regimes in the period 1986-1991.

The cod larvae distribution is modelled using eggs drifting from the spawning aggregations in

the Lofoten Islands. We found that inter-annual variability in the spatial aggregations of the

spawners influenced the distribution of larvae drifted. We have also shown how the spatial

distribution of passive-drifting larvae can change over the two regimes (1986-1988 and 1989-

1991), being more upstream in cold periods. Though the currents pattern is the main

hydrographical factor shaping the spatial distribution of larvae, the temperature modifies such

distribution by affecting larvae survival. However, our study highlights the geographic

extension of the temperature effect changed between warm and cold periods, with clear

ecological implications in terms of growth and survival. This approach can be useful for other

fish populations to further understand the underlying processes shaping the seascape of early

life stages.

Keywords: Barents Sea cod, larvae, hydrographical particles-tracking models, spatial

analyses.
Series
ICES CM Documents;2009/C:06

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