Quantifying the influence of geography and environment on the northeast Atlantic mackerel spawning distribution

Thomas Brunel*, Cindy J. G. van Damme, Melvin Samson, Mark Dickey-Collas

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Mackerel (Scomber scombrus) in the northeast Atlantic have shown changes in distribution at certain times of the year, which have impacted their exploitation and management. In this study, mackerel spawning habitat over 21 recent years was characterised using generalised additive modelling, based on spatial egg density data collected every third year during targeted ichthyoplankton surveys. Mackerel spawning distribution was found to depend primarily on geographical variables (coordinates and bottom depth), with preferred spawning locations on the shelf-edge from the north of the Iberian peninsula to the west of Scotland, with a maximum west of Ireland. Environmental drivers had a lesser influence on egg distribution. Dome shaped relationships were found with temperature and mixed layer depth, with respective optimum at 13 degrees C and around -300m. The model was used to reconstruct maps of the potential habitat (areas where conditions were suitable, but not necessarily used, for spawning). Little changes were observed over the years in the potential habitat, suggesting that the expansion of the egg distribution (realised habitat) was not triggered by changes in the environmental variables investigated. Little evidence was found for density-dependent habitat selection. There was a tendency for mackerel to make more use of areas of lesser suitability in years with large stock size (1992 and 2010). This pattern, however, broke down in 2013, when stock size was the highest, as spawning occurred very south and concentrated in the most suitable habitat.
Original languageEnglish
JournalFisheries Oceanography
Volume27
Issue number2
Pages (from-to)159-173
ISSN1365-2419
DOIs
Publication statusPublished - 2018

Keywords

  • FISHERIES
  • OCEANOGRAPHY
  • ANCHOVY ENGRAULIS-ENCRASICOLUS
  • CLIMATE-CHANGE
  • SPATIAL-DISTRIBUTION
  • MULTIMODEL APPROACH
  • MEDITERRANEAN SEA
  • SCOMBER-SCOMBRUS
  • FISH POPULATIONS
  • SHELF EDGE
  • HABITAT
  • BISCAY
  • density-dependence
  • generalised additive model
  • habitat suitability
  • mackerel
  • spatial distribution
  • spawning strategy
  • density‐dependence

Cite this

@article{4c32830159be4b0bb4b3ad3b4e93b9d4,
title = "Quantifying the influence of geography and environment on the northeast Atlantic mackerel spawning distribution",
abstract = "Mackerel (Scomber scombrus) in the northeast Atlantic have shown changes in distribution at certain times of the year, which have impacted their exploitation and management. In this study, mackerel spawning habitat over 21 recent years was characterised using generalised additive modelling, based on spatial egg density data collected every third year during targeted ichthyoplankton surveys. Mackerel spawning distribution was found to depend primarily on geographical variables (coordinates and bottom depth), with preferred spawning locations on the shelf-edge from the north of the Iberian peninsula to the west of Scotland, with a maximum west of Ireland. Environmental drivers had a lesser influence on egg distribution. Dome shaped relationships were found with temperature and mixed layer depth, with respective optimum at 13 degrees C and around -300m. The model was used to reconstruct maps of the potential habitat (areas where conditions were suitable, but not necessarily used, for spawning). Little changes were observed over the years in the potential habitat, suggesting that the expansion of the egg distribution (realised habitat) was not triggered by changes in the environmental variables investigated. Little evidence was found for density-dependent habitat selection. There was a tendency for mackerel to make more use of areas of lesser suitability in years with large stock size (1992 and 2010). This pattern, however, broke down in 2013, when stock size was the highest, as spawning occurred very south and concentrated in the most suitable habitat.",
keywords = "FISHERIES, OCEANOGRAPHY, ANCHOVY ENGRAULIS-ENCRASICOLUS, CLIMATE-CHANGE, SPATIAL-DISTRIBUTION, MULTIMODEL APPROACH, MEDITERRANEAN SEA, SCOMBER-SCOMBRUS, FISH POPULATIONS, SHELF EDGE, HABITAT, BISCAY, density-dependence, generalised additive model, habitat suitability, mackerel, spatial distribution, spawning strategy, density‐dependence",
author = "Thomas Brunel and {van Damme}, {Cindy J. G.} and Melvin Samson and Mark Dickey-Collas",
year = "2018",
doi = "10.1111/fog.12242",
language = "English",
volume = "27",
pages = "159--173",
journal = "Fisheries Oceanography Online",
issn = "1365-2419",
publisher = "Wiley-Blackwell",
number = "2",

}

Quantifying the influence of geography and environment on the northeast Atlantic mackerel spawning distribution. / Brunel, Thomas; van Damme, Cindy J. G.; Samson, Melvin; Dickey-Collas, Mark.

In: Fisheries Oceanography, Vol. 27, No. 2, 2018, p. 159-173.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Quantifying the influence of geography and environment on the northeast Atlantic mackerel spawning distribution

AU - Brunel, Thomas

AU - van Damme, Cindy J. G.

AU - Samson, Melvin

AU - Dickey-Collas, Mark

PY - 2018

Y1 - 2018

N2 - Mackerel (Scomber scombrus) in the northeast Atlantic have shown changes in distribution at certain times of the year, which have impacted their exploitation and management. In this study, mackerel spawning habitat over 21 recent years was characterised using generalised additive modelling, based on spatial egg density data collected every third year during targeted ichthyoplankton surveys. Mackerel spawning distribution was found to depend primarily on geographical variables (coordinates and bottom depth), with preferred spawning locations on the shelf-edge from the north of the Iberian peninsula to the west of Scotland, with a maximum west of Ireland. Environmental drivers had a lesser influence on egg distribution. Dome shaped relationships were found with temperature and mixed layer depth, with respective optimum at 13 degrees C and around -300m. The model was used to reconstruct maps of the potential habitat (areas where conditions were suitable, but not necessarily used, for spawning). Little changes were observed over the years in the potential habitat, suggesting that the expansion of the egg distribution (realised habitat) was not triggered by changes in the environmental variables investigated. Little evidence was found for density-dependent habitat selection. There was a tendency for mackerel to make more use of areas of lesser suitability in years with large stock size (1992 and 2010). This pattern, however, broke down in 2013, when stock size was the highest, as spawning occurred very south and concentrated in the most suitable habitat.

AB - Mackerel (Scomber scombrus) in the northeast Atlantic have shown changes in distribution at certain times of the year, which have impacted their exploitation and management. In this study, mackerel spawning habitat over 21 recent years was characterised using generalised additive modelling, based on spatial egg density data collected every third year during targeted ichthyoplankton surveys. Mackerel spawning distribution was found to depend primarily on geographical variables (coordinates and bottom depth), with preferred spawning locations on the shelf-edge from the north of the Iberian peninsula to the west of Scotland, with a maximum west of Ireland. Environmental drivers had a lesser influence on egg distribution. Dome shaped relationships were found with temperature and mixed layer depth, with respective optimum at 13 degrees C and around -300m. The model was used to reconstruct maps of the potential habitat (areas where conditions were suitable, but not necessarily used, for spawning). Little changes were observed over the years in the potential habitat, suggesting that the expansion of the egg distribution (realised habitat) was not triggered by changes in the environmental variables investigated. Little evidence was found for density-dependent habitat selection. There was a tendency for mackerel to make more use of areas of lesser suitability in years with large stock size (1992 and 2010). This pattern, however, broke down in 2013, when stock size was the highest, as spawning occurred very south and concentrated in the most suitable habitat.

KW - FISHERIES

KW - OCEANOGRAPHY

KW - ANCHOVY ENGRAULIS-ENCRASICOLUS

KW - CLIMATE-CHANGE

KW - SPATIAL-DISTRIBUTION

KW - MULTIMODEL APPROACH

KW - MEDITERRANEAN SEA

KW - SCOMBER-SCOMBRUS

KW - FISH POPULATIONS

KW - SHELF EDGE

KW - HABITAT

KW - BISCAY

KW - density-dependence

KW - generalised additive model

KW - habitat suitability

KW - mackerel

KW - spatial distribution

KW - spawning strategy

KW - density‐dependence

U2 - 10.1111/fog.12242

DO - 10.1111/fog.12242

M3 - Journal article

VL - 27

SP - 159

EP - 173

JO - Fisheries Oceanography Online

JF - Fisheries Oceanography Online

SN - 1365-2419

IS - 2

ER -