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Consumption of discards by Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus off the Belgian coast in the breeding season

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Consumption of discards by Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus off the Belgian coast in the breeding season. / Sotillo, Alejandro; Depestele, Jochen; Courtens, Wouter; Vincx, Magda; Stienen, Eric.

In: Ardea, Vol. 102, 2014, p. 195–205.

Research output: Contribution to journalA1: Web of Science-article

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@article{f6ddc6cffb3b4d97ae7fd4ca7726d60b,
title = "Consumption of discards by Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus off the Belgian coast in the breeding season",
abstract = "Fishery discards in the Belgian part of the North Sea are a source of food forHerring Gulls Larus argentatus and Lesser Black-backed Gulls L. fuscus. Tounderstand the importance of discards for local L. argentatus and L. fuscuspopulations, single-item discard experiments were performed at four offshoredistances from the gullery of the Port of Zeebrugge, at four different stages ofthe breeding season (May to August 2011). We compared flock compositionduring discarding with the distribution of Herring and Lesser Black-backed Gulls,with respect to offshore distance from the colony as reflected by an 11-year(2002–2013) dataset of standardised ship-based surveys. Consumption ofdiscards depended on the type of fish that was discarded, but prey selectivity byadults was reduced during the chick rearing stage. A generalised linear mixedmodel identified the number of scavengers following the vessel, the proportion ofadults and of Herring Gulls in the flock and the frequency of food robbery eventsinteracting with the stage of the breeding season as affecting the variation in flatfishconsumption. Shifts in scavenger flock composition and discard consumptionbetween stages of the breeding season are likely linked to variation in foodrequirements of the gull population along the season and to dispersal patternstowards the end of summer. Nutrient requirements of breeding adults peakduring the chick rearing stage, making this a key period in terms of dependenceof the breeding parents on discarded fish as food source.",
author = "Alejandro Sotillo and Jochen Depestele and Wouter Courtens and Magda Vincx and Eric Stienen",
year = "2014",
doi = "10.5253/arde.v102i2.a9",
language = "English",
volume = "102",
pages = "195–205",
journal = "Ardea",
issn = "0373-2266",
publisher = "Nederlandse Ornithologische Unie",

}

RIS

TY - JOUR

T1 - Consumption of discards by Herring Gulls Larus argentatus and Lesser Black-backed Gulls Larus fuscus off the Belgian coast in the breeding season

AU - Sotillo, Alejandro

AU - Depestele, Jochen

AU - Courtens, Wouter

AU - Vincx, Magda

AU - Stienen, Eric

PY - 2014

Y1 - 2014

N2 - Fishery discards in the Belgian part of the North Sea are a source of food forHerring Gulls Larus argentatus and Lesser Black-backed Gulls L. fuscus. Tounderstand the importance of discards for local L. argentatus and L. fuscuspopulations, single-item discard experiments were performed at four offshoredistances from the gullery of the Port of Zeebrugge, at four different stages ofthe breeding season (May to August 2011). We compared flock compositionduring discarding with the distribution of Herring and Lesser Black-backed Gulls,with respect to offshore distance from the colony as reflected by an 11-year(2002–2013) dataset of standardised ship-based surveys. Consumption ofdiscards depended on the type of fish that was discarded, but prey selectivity byadults was reduced during the chick rearing stage. A generalised linear mixedmodel identified the number of scavengers following the vessel, the proportion ofadults and of Herring Gulls in the flock and the frequency of food robbery eventsinteracting with the stage of the breeding season as affecting the variation in flatfishconsumption. Shifts in scavenger flock composition and discard consumptionbetween stages of the breeding season are likely linked to variation in foodrequirements of the gull population along the season and to dispersal patternstowards the end of summer. Nutrient requirements of breeding adults peakduring the chick rearing stage, making this a key period in terms of dependenceof the breeding parents on discarded fish as food source.

AB - Fishery discards in the Belgian part of the North Sea are a source of food forHerring Gulls Larus argentatus and Lesser Black-backed Gulls L. fuscus. Tounderstand the importance of discards for local L. argentatus and L. fuscuspopulations, single-item discard experiments were performed at four offshoredistances from the gullery of the Port of Zeebrugge, at four different stages ofthe breeding season (May to August 2011). We compared flock compositionduring discarding with the distribution of Herring and Lesser Black-backed Gulls,with respect to offshore distance from the colony as reflected by an 11-year(2002–2013) dataset of standardised ship-based surveys. Consumption ofdiscards depended on the type of fish that was discarded, but prey selectivity byadults was reduced during the chick rearing stage. A generalised linear mixedmodel identified the number of scavengers following the vessel, the proportion ofadults and of Herring Gulls in the flock and the frequency of food robbery eventsinteracting with the stage of the breeding season as affecting the variation in flatfishconsumption. Shifts in scavenger flock composition and discard consumptionbetween stages of the breeding season are likely linked to variation in foodrequirements of the gull population along the season and to dispersal patternstowards the end of summer. Nutrient requirements of breeding adults peakduring the chick rearing stage, making this a key period in terms of dependenceof the breeding parents on discarded fish as food source.

U2 - 10.5253/arde.v102i2.a9

DO - 10.5253/arde.v102i2.a9

M3 - A1: Web of Science-article

VL - 102

SP - 195

EP - 205

JO - Ardea

JF - Ardea

SN - 0373-2266

ER -

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  • A102-195-205

    Accepted author manuscript, 1.17 MB, PDF document

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