Seabird attraction to fishing vessels is a local process

ABSTRACT: Seabird aggregation and scavenging around fishing vessels is widely assumed to be a major component of seabird ecology. However, few field data have shown the relative importance of human fishing activities in comparison with the distribution of marine habitats and the availability of natu...

Ausführliche Beschreibung

Bibliographische Detailangaben
Veröffentlicht in:	Marine Ecology Progress Series. - Inter-Research, 1979. - 214(2001) vom: Apr., Seite 289-298
1. Verfasser:	Skov, Henrik (VerfasserIn)
Weitere Verfasser:	Durinck, Jan
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2001
Zugriff auf das übergeordnete Werk:	Marine Ecology Progress Series
Schlagworte:	Fisheries Seabird habitats Discards Oceanography Northwest European Shelf Biological sciences Applied sciences Physical sciences Business


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100	1		\|a Skov, Henrik \|e verfasserin \|4 aut
245	1	0	\|a Seabird attraction to fishing vessels is a local process
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520			\|a ABSTRACT: Seabird aggregation and scavenging around fishing vessels is widely assumed to be a major component of seabird ecology. However, few field data have shown the relative importance of human fishing activities in comparison with the distribution of marine habitats and the availability of natural food sources. Here we perform a spatial analysis of the relative influence of fishing activities, by modelling observed density gradients of working trawlers and attracted seabirds along PCA-derived large scale gradients in hydrographic variables and abundance of small herringClupea harengus, from shallow estuarine waters to deep oceanic waters across the Baltic Sea-North Sea interface. All hydrographic and biological data, including numbers of attracted seabirds, were collected synoptically from a ship sampling systematically throughout the region. The analysis indicates that a relatively small degree of overlap exists between the spatial distribution of fishing vessels and that of potentially scavenging seabirds. Gradients in the abundance of seabirds attracted to the ship indicate responses to hydrographic features such as upwelling zones and fronts, and gradients in the supply of natural foods such as schools of immature herring, rather than responses to changes in the supply of discards from fishing vessels. Estimates of the scale of attraction of seabirds by the research ship further indicate that attraction in the Baltic Sea-North Sea gradient is a local (<10 km) process. The small-scale nature of the attraction of seabirds to ships in the region is further tested by displaying observations of trawlers and attracted seabirds obtained from separate cruises in relation to observed salinity and pycnocline characteristics. We suggest that in similar heterogeneous environments at least, attraction of seabirds by trawlers is predominantly a result of local processes. Our results illustrate that the importance of human fisheries in seabird ecology cannot be assessed without detailed knowledge of seabirds’ dependence on natural food sources and habitats.
540			\|a © Inter-Research 2001
650		4	\|a Fisheries
650		4	\|a Seabird habitats
650		4	\|a Discards
650		4	\|a Oceanography
650		4	\|a Northwest European Shelf
650		4	\|a Biological sciences \|x Biology \|x Zoology \|x Animals \|x Birds \|x Waterfowl \|x Sea birds
650		4	\|a Applied sciences \|x Engineering \|x Transportation \|x Vehicles \|x Watercraft \|x Boats \|x Fishing boats \|x Trawlers
650		4	\|a Physical sciences \|x Earth sciences \|x Geography \|x Geomorphology \|x Bodies of water \|x Seas
650		4	\|a Applied sciences \|x Engineering \|x Transportation \|x Vehicles \|x Watercraft \|x Ships
650		4	\|a Biological sciences \|x Biology \|x Zoology \|x Animals \|x Fish \|x Herring
650		4	\|a Business \|x Industry \|x Industrial sectors \|x Service industries \|x Transportation industries \|x Travel industry \|x Tourism \|x Cruises
650		4	\|a Physical sciences \|x Chemistry \|x Chemical properties \|x Salinity
650		4	\|a Physical sciences \|x Chemistry \|x Chemical reactions \|x Chemical processes \|x Chemical separation \|x Scavenging
650		4	\|a Physical sciences \|x Earth sciences \|x Hydrology \|x Water \|x Saltwater \|x Sea water
650		4	\|a Applied sciences \|x Engineering \|x Transportation \|x Vehicles \|x Watercraft \|x Boats \|x Fishing vessels
655		4	\|a research-article
700	1		\|a Durinck, Jan \|e verfasserin \|4 aut
773	0	8	\|i Enthalten in \|t Marine Ecology Progress Series \|d Inter-Research, 1979 \|g 214(2001) vom: Apr., Seite 289-298 \|w (DE-627)320617998 \|w (DE-600)2022265-8 \|x 16161599 \|7 nnns
773	1	8	\|g volume:214 \|g year:2001 \|g month:04 \|g pages:289-298
856	4	0	\|u https://www.jstor.org/stable/24864246 \|3 Volltext
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