Analysis of the spatial distributions of mature cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) abundance in the North Sea (1980-1999) using Generalised Additive Models

R. Hedger, E. Mckenzie, M. Heath, P. Wright, Beth Emily Scott, Juan Gallego-Fernandez, J. Andrews

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Patterns of mature cod and haddock abundance in the North Sea were estimated from International Council for the Exploration of the Seas (ICES) International Bottom Trawl Survey (IBTS) data acquired from 1980 to 1999 in the first quarter of each year. Relationships between abundances and environmental properties (water depth, bottom temperature and bottom salinity) were analysed through the use of generalised additive models (GAMs). Cod were tolerant of a wide range of environments found throughout the North Sea, but predominantly occurred in, either, shallower (depths less than 50 m), colder and less saline waters of the southern North Sea, or, deeper (depths greater than 100 m), warmer and more saline waters of the northern North Sea. In contrast, the bulk of the haddock population was confined to the northern North Sea. Greatest haddock abundances were found between 75 and 125 m, and abundance, were positively related to temperature and salinity. While there was no decadal shift in haddock spatial distribution, the 1990s were associated with a displacement of cod towards deeper waters in the northern North Sea. (C) 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)17-25
Number of pages9
JournalFisheries Research
Volume70
DOIs
Publication statusPublished - 2004

Keywords

  • cod and haddock
  • temperature
  • salinity
  • water column depth
  • generalised additive modelling
  • Atlantic
  • environment
  • fish
  • fluctuations
  • variability
  • patterns
  • ecology

Cite this

@article{4673977577e3473bb7a9d7127c9599fc,
title = "Analysis of the spatial distributions of mature cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) abundance in the North Sea (1980-1999) using Generalised Additive Models",
abstract = "Patterns of mature cod and haddock abundance in the North Sea were estimated from International Council for the Exploration of the Seas (ICES) International Bottom Trawl Survey (IBTS) data acquired from 1980 to 1999 in the first quarter of each year. Relationships between abundances and environmental properties (water depth, bottom temperature and bottom salinity) were analysed through the use of generalised additive models (GAMs). Cod were tolerant of a wide range of environments found throughout the North Sea, but predominantly occurred in, either, shallower (depths less than 50 m), colder and less saline waters of the southern North Sea, or, deeper (depths greater than 100 m), warmer and more saline waters of the northern North Sea. In contrast, the bulk of the haddock population was confined to the northern North Sea. Greatest haddock abundances were found between 75 and 125 m, and abundance, were positively related to temperature and salinity. While there was no decadal shift in haddock spatial distribution, the 1990s were associated with a displacement of cod towards deeper waters in the northern North Sea. (C) 2004 Elsevier B.V. All rights reserved.",
keywords = "cod and haddock, temperature, salinity, water column depth, generalised additive modelling, Atlantic, environment, fish, fluctuations, variability, patterns, ecology",
author = "R. Hedger and E. Mckenzie and M. Heath and P. Wright and Scott, {Beth Emily} and Juan Gallego-Fernandez and J. Andrews",
year = "2004",
doi = "10.1016/j.fishres.2004.07.002",
language = "English",
volume = "70",
pages = "17--25",
journal = "Fisheries Research",
issn = "0165-7836",
publisher = "Elsevier Science B. V.",

}

TY - JOUR

T1 - Analysis of the spatial distributions of mature cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) abundance in the North Sea (1980-1999) using Generalised Additive Models

AU - Hedger, R.

AU - Mckenzie, E.

AU - Heath, M.

AU - Wright, P.

AU - Scott, Beth Emily

AU - Gallego-Fernandez, Juan

AU - Andrews, J.

PY - 2004

Y1 - 2004

N2 - Patterns of mature cod and haddock abundance in the North Sea were estimated from International Council for the Exploration of the Seas (ICES) International Bottom Trawl Survey (IBTS) data acquired from 1980 to 1999 in the first quarter of each year. Relationships between abundances and environmental properties (water depth, bottom temperature and bottom salinity) were analysed through the use of generalised additive models (GAMs). Cod were tolerant of a wide range of environments found throughout the North Sea, but predominantly occurred in, either, shallower (depths less than 50 m), colder and less saline waters of the southern North Sea, or, deeper (depths greater than 100 m), warmer and more saline waters of the northern North Sea. In contrast, the bulk of the haddock population was confined to the northern North Sea. Greatest haddock abundances were found between 75 and 125 m, and abundance, were positively related to temperature and salinity. While there was no decadal shift in haddock spatial distribution, the 1990s were associated with a displacement of cod towards deeper waters in the northern North Sea. (C) 2004 Elsevier B.V. All rights reserved.

AB - Patterns of mature cod and haddock abundance in the North Sea were estimated from International Council for the Exploration of the Seas (ICES) International Bottom Trawl Survey (IBTS) data acquired from 1980 to 1999 in the first quarter of each year. Relationships between abundances and environmental properties (water depth, bottom temperature and bottom salinity) were analysed through the use of generalised additive models (GAMs). Cod were tolerant of a wide range of environments found throughout the North Sea, but predominantly occurred in, either, shallower (depths less than 50 m), colder and less saline waters of the southern North Sea, or, deeper (depths greater than 100 m), warmer and more saline waters of the northern North Sea. In contrast, the bulk of the haddock population was confined to the northern North Sea. Greatest haddock abundances were found between 75 and 125 m, and abundance, were positively related to temperature and salinity. While there was no decadal shift in haddock spatial distribution, the 1990s were associated with a displacement of cod towards deeper waters in the northern North Sea. (C) 2004 Elsevier B.V. All rights reserved.

KW - cod and haddock

KW - temperature

KW - salinity

KW - water column depth

KW - generalised additive modelling

KW - Atlantic

KW - environment

KW - fish

KW - fluctuations

KW - variability

KW - patterns

KW - ecology

U2 - 10.1016/j.fishres.2004.07.002

DO - 10.1016/j.fishres.2004.07.002

M3 - Article

VL - 70

SP - 17

EP - 25

JO - Fisheries Research

JF - Fisheries Research

SN - 0165-7836

ER -