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Fish and seabird spatial distribution and abundance around the largest seabird colony in the baltic sea

Hentati-Sundberg, Jonas ; Evans, Thomas LU ; Österblom, Henrik ; Hjelm, Joakim ; Larson, Niklas ; Bakken, Vidar ; Svenson, Anders and Olsson, Olof (2018) In Marine Ornithology 46(1). p.61-68
Abstract

We studied the at-sea distribution of two auks (Common Murre Uria aalge, Razorbill Alca torda), two gulls (Lesser Black-backed Gull Larus fuscus, Herring Gull Larus argentatus), and Great Cormorant Phalacrocorax carbo during the peak breeding season of 2014 around Stora Karlsö, the main Baltic Sea seabird colony. Simultaneously, we quantified forage fish abundance and distribution using hydro-acoustics and pelagic trawling. The auks and gulls had a roughly similar distribution, foraging mainly about 40 km west-northwest from the colony. Great Cormorants were found only in inshore areas, close to the colony. Sprat Sprattus sprattus and herring Clupea harengus biomass was, respectively, 1.38 and 2.68 mt/km2 averaged over the... (More)

We studied the at-sea distribution of two auks (Common Murre Uria aalge, Razorbill Alca torda), two gulls (Lesser Black-backed Gull Larus fuscus, Herring Gull Larus argentatus), and Great Cormorant Phalacrocorax carbo during the peak breeding season of 2014 around Stora Karlsö, the main Baltic Sea seabird colony. Simultaneously, we quantified forage fish abundance and distribution using hydro-acoustics and pelagic trawling. The auks and gulls had a roughly similar distribution, foraging mainly about 40 km west-northwest from the colony. Great Cormorants were found only in inshore areas, close to the colony. Sprat Sprattus sprattus and herring Clupea harengus biomass was, respectively, 1.38 and 2.68 mt/km2 averaged over the whole study area. These estimates represent a total biomass for small pelagic fish of 17 900 t in the 4 408 km2 study area. The estimated prey consumption over the breeding season was 2 310 t for Common Murre and Razorbill combined. Thus, auks may have a non-negligible impact on their prey sources in the region. Common Murres foraged closer to the colony (median 36.3 km) than Razorbills (median 41.1 km), but we found no significant correlation between auk at-sea numbers and fish densities. We discuss how new technology can contribute to detailed monitoring of the interactions between seabirds and fish at different spatial and temporal scales, with the ultimate aim of providing a scientific basis for ecosystem-based management.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alca torda, Ecosystem surveys, Ecosystem-based management, Forage fish, Larus argentatus, Larus fuscus, Phalacrocorax carbo, Uria aalge
in
Marine Ornithology
volume
46
issue
1
pages
8 pages
publisher
Marine Ornithology
external identifiers
  • scopus:85046953129
ISSN
1018-3337
project
Centre for Animal Movement Research
language
English
LU publication?
yes
id
67f7ec63-ebbd-4fe2-9edb-b7f229df998a
date added to LUP
2018-05-28 14:04:33
date last changed
2021-09-29 04:42:47
@article{67f7ec63-ebbd-4fe2-9edb-b7f229df998a,
  abstract     = {<p>We studied the at-sea distribution of two auks (Common Murre Uria aalge, Razorbill Alca torda), two gulls (Lesser Black-backed Gull Larus fuscus, Herring Gull Larus argentatus), and Great Cormorant Phalacrocorax carbo during the peak breeding season of 2014 around Stora Karlsö, the main Baltic Sea seabird colony. Simultaneously, we quantified forage fish abundance and distribution using hydro-acoustics and pelagic trawling. The auks and gulls had a roughly similar distribution, foraging mainly about 40 km west-northwest from the colony. Great Cormorants were found only in inshore areas, close to the colony. Sprat Sprattus sprattus and herring Clupea harengus biomass was, respectively, 1.38 and 2.68 mt/km<sup>2</sup> averaged over the whole study area. These estimates represent a total biomass for small pelagic fish of 17 900 t in the 4 408 km<sup>2</sup> study area. The estimated prey consumption over the breeding season was 2 310 t for Common Murre and Razorbill combined. Thus, auks may have a non-negligible impact on their prey sources in the region. Common Murres foraged closer to the colony (median 36.3 km) than Razorbills (median 41.1 km), but we found no significant correlation between auk at-sea numbers and fish densities. We discuss how new technology can contribute to detailed monitoring of the interactions between seabirds and fish at different spatial and temporal scales, with the ultimate aim of providing a scientific basis for ecosystem-based management.</p>},
  author       = {Hentati-Sundberg, Jonas and Evans, Thomas and Österblom, Henrik and Hjelm, Joakim and Larson, Niklas and Bakken, Vidar and Svenson, Anders and Olsson, Olof},
  issn         = {1018-3337},
  language     = {eng},
  month        = {04},
  number       = {1},
  pages        = {61--68},
  publisher    = {Marine Ornithology},
  series       = {Marine Ornithology},
  title        = {Fish and seabird spatial distribution and abundance around the largest seabird colony in the baltic sea},
  volume       = {46},
  year         = {2018},
}