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
- 30 November 2004
- journal article
- Published by Elsevier BV in Fisheries Research
- Vol. 70 (1), 17-25
- https://doi.org/10.1016/j.fishres.2004.07.002
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 abundances 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.Keywords
This publication has 19 references indexed in Scilit:
- Long‐term changes in copepod abundance and diversity in the north‐east Atlantic in relation to fluctuations in the hydroclimatic environmentFisheries Oceanography, 2003
- Patterns in the spawning of cod (Gadus morhuaL.), sole (Solea soleaL.) and plaice (Pleuronectes platessaL.) in the Irish Sea as determined by generalized additive modellingFisheries Oceanography, 2000
- Habitat selection and clustering of a pelagic fish: effects of topography and bathymetry on species dynamicsCanadian Journal of Fisheries and Aquatic Sciences, 1999
- Long-term fluctuations in cod and pollack along the Norwegian Skagerrak coastMarine Ecology Progress Series, 1998
- Sea surface temperature changes in the North Sea and their causesICES Journal of Marine Science, 1996
- Hydrography of the East Shetland Basin in relation to decadal North Sea variabilityICES Journal of Marine Science, 1996
- Associations between Atlantic cod (Gadus morhua) and hydrographic variables: implications for the management of the 4VsW cod stockICES Journal of Marine Science, 1996
- A Statistical Test for a Difference between the Spatial Distributions of Two PopulationsEcology, 1996
- Ecology of haddock (Melanogrammus aeglefinus L.) in the Norwegian DeepICES Journal of Marine Science, 1994
- The distribution of cod (Gadus morhua) in relation to temperature and oxygen level in the Gulf of St. LawrenceFisheries Oceanography, 1993