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Now showing items 41-43 of 43

Undersøkelsene på Melkøya : Melkøyaprosjektet - kulturhistoriske registreringer og utgravninger 2001 og 2002

Hesjedal, Anders; Ramstad, Morten; Niemi, Anja Roth (Research report; Forskningsrapport, 2009)

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URI: http://hdl.handle.net/10037/2437

File(s) in this item: 11

appendiks.pdf (5.555Mb)

innledning.pdf (9.446Mb)

kapittel_1.pdf (14.06Mb)

kapittel_2.pdf (7.560Mb)
(more files)

Unintended consequences: how the recovery of sea eagle Haliaeetus spp. populations in the northern hemisphere is affecting seabirds

Hipfner, Mark J.; Blight, Louise K.; Lowe, Roy W.; Wilhelm, Sabina I.; Robertson, Gregory J.; Barrett, Robert; Anker-Nilssen, Tycho; Good, Thomas P. (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)

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Abstract:

The recovery of sea eagle Haliaeetus spp. populations in the temperate northern hemisphere in the closing decades of the 20th century is one of the great conservation success stories of recent times, but the re-establishment of these apex predators in marine systems has had consequences for seabirds. Sea eagles affect seabirds both directly (by taking adults and offspring and by inducing potentially costly behaviors to minimize danger) and indirectly (by facilitating the nest predators of seabirds, mainly gulls and corvids). Repeated disturbance by hunting eagles has caused seabirds to abandon colonies and subcolonies in the tens to hundreds of thousands of pairs. In recent years, sea eagles have been widely implicated in local declines of surface-nesting seabirds in the northeast Pacific Ocean, the northwest Atlantic Ocean and northern Europe. The extent to which recent events simply reflect a return to a more “natural” ecological baseline as sea eagle populations recover from decades of persecution and chemical pollutants is discussed. We argue that there is need for a research effort to investigate the conservation implications of increasing sea eagles in the context of multiple threats to seabird populations.

URI:

http://hdl.handle.net/10037/5110

File(s) in this item: 1

article.pdf (136.2Kb)

Virological and serological surveillance for type A influenza in the black-legged kittiwake (Rissa tridactyla)

Tønnessen, Ragnhild; Germundsson, Anna; Jonassen, Christine M; Haugen, Irene; Berg, Kristin; Barrett, Robert; Rimstad, Espen (Journal article; Tidsskriftartikkel; Peer reviewed, 2011)

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Abstract:

The epidemiology of avian influenza viruses (AIVs) in gulls is only partially known. The role of the world's most numerous gull species, the black-legged kittiwake (Rissa tridactyla), as a potential AIV reservoir species has been unclear. The prevalence of AIV and humoral response against AIV were therefore studied in a colony of apparently healthy black-legged kittiwakes breeding in a nesting cliff in the South West Barents Region of Norway (70°22' N, 31°10' E), in 2008 and 2009. AIVs were detected from the oropharynx and cloaca in low amounts, with prevalences of 15% and 5%, in 2008 and 2009, respectively. Direct, partial sequencing of the hemagglutinin (HA) gene revealed that the H4 subtype was present. In 2009, antibodies to influenza A virus were detected in sera from 57 of 80 adult birds. In contrast, none of the three-week-old chicks (n = 18) tested seropositive. Hemagglutination inhibition (HI) assays demonstrated that the adult kittiwakes primarily had antibodies specific to the gull-associated H13 and H16 subtypes, with antibodies to H16 being most common. These results support that the highly pelagic black-legged kittiwake is a reservoir of AIV. The serological findings suggest that H16 might be the main AIV subtype in the black-legged kittiwake. Further studies are needed to understand the ecology of AIV in the black-legged kittiwake and in gulls in general.

URI:

http://hdl.handle.net/10037/4082

File(s) in this item: 1

article.pdf (304.9Kb)

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