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Quantifying the impact of environmental variables upon catch per unit effort of the blue shark Prionace glauca in the western English Channel

Quantifying the impact of environmental variables upon catch per unit effort of the blue shark Prionace glauca in the western English Channel
Quantifying the impact of environmental variables upon catch per unit effort of the blue shark Prionace glauca in the western English Channel
The effect of environmental variables on blue shark Prionace glauca catch per unit effort (CPUE) in a recreational fishery in the western English Channel, between June and September 1998–2011, was quantified using generalized additive models (GAMs). Sea surface temperature (SST) explained 1·4% of GAM deviance, and highest CPUE occurred at 16·7° C, reflecting the optimal thermal preferences of this species. Surface chlorophyll a concentration (CHL) significantly affected CPUE and caused 27·5% of GAM deviance. Additionally, increasing CHL led to rising CPUE, probably due to higher productivity supporting greater prey biomass. The density of shelf-sea tidal mixing fronts explained 5% of GAM deviance, but was non-significant, with increasing front density negatively affecting CPUE. Time-lagged frontal density significantly affected CPUE, however, causing 12·6% of the deviance in a second GAM and displayed a positive correlation. This outcome suggested a delay between the evolution of frontal features and the subsequent accumulation of productivity and attraction of higher trophic level predators, such as P. glauca.
environmental preferences, fisheries management, generalized additive model, recreational fishery
0022-1112
657-670
Mitchell, J.D.
8ea91da2-26c3-4471-bc24-dc9daf125d88
Collins, K.J.
9c436eb8-add5-460e-9900-5d1d128dc63d
Miller, P.I.
bffe8892-484a-45c9-a278-a484e5095a2b
Suberg, L.A.
9b185258-8bb2-4771-a767-5b446ecb6d56
Mitchell, J.D.
8ea91da2-26c3-4471-bc24-dc9daf125d88
Collins, K.J.
9c436eb8-add5-460e-9900-5d1d128dc63d
Miller, P.I.
bffe8892-484a-45c9-a278-a484e5095a2b
Suberg, L.A.
9b185258-8bb2-4771-a767-5b446ecb6d56

Mitchell, J.D., Collins, K.J., Miller, P.I. and Suberg, L.A. (2014) Quantifying the impact of environmental variables upon catch per unit effort of the blue shark Prionace glauca in the western English Channel. Journal of Fish Biology, 85 (3), 657-670. (doi:10.1111/jfb.12448).

Record type: Article

Abstract

The effect of environmental variables on blue shark Prionace glauca catch per unit effort (CPUE) in a recreational fishery in the western English Channel, between June and September 1998–2011, was quantified using generalized additive models (GAMs). Sea surface temperature (SST) explained 1·4% of GAM deviance, and highest CPUE occurred at 16·7° C, reflecting the optimal thermal preferences of this species. Surface chlorophyll a concentration (CHL) significantly affected CPUE and caused 27·5% of GAM deviance. Additionally, increasing CHL led to rising CPUE, probably due to higher productivity supporting greater prey biomass. The density of shelf-sea tidal mixing fronts explained 5% of GAM deviance, but was non-significant, with increasing front density negatively affecting CPUE. Time-lagged frontal density significantly affected CPUE, however, causing 12·6% of the deviance in a second GAM and displayed a positive correlation. This outcome suggested a delay between the evolution of frontal features and the subsequent accumulation of productivity and attraction of higher trophic level predators, such as P. glauca.

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More information

Published date: September 2014
Keywords: environmental preferences, fisheries management, generalized additive model, recreational fishery
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 368494
URI: http://eprints.soton.ac.uk/id/eprint/368494
ISSN: 0022-1112
PURE UUID: 8cf23336-e794-434c-b684-27d91e3ec334

Catalogue record

Date deposited: 01 Sep 2014 12:28
Last modified: 15 Jul 2019 21:46

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