The diet, growth and survival of Razorbill Alca torda chicks in the southern Barents Sea

Published on Dec 4, 2015
· DOI :10.15845/on.v38i0.891
Robert T. Barrett (University of Bergen)
Over 32 years (1981–2013), Razorbills Alca torda breeding at Hornoya, NE Norway fed their chicks on capelin Mallotus villosus , sandeels Ammodytes spp. and, sometimes, I-group herring Clupea harengus . It seems that Razorbills are opportunistic and feed their chicks the youngest stages of herring in years when the latter are numerous in the southern Barents Sea. Increasing sea temperatures and resulting shifts in fish distribution may result in fewer capelin and more herring and sandeels in the chick diet.
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Published on Mar 1, 2015
Per Fauchald26
Estimated H-index: 26
Tycho Anker-Nilssen19
Estimated H-index: 19
+ 12 AuthorsSveinn Are Hanssen21
Estimated H-index: 21
Published on Feb 1, 2015
Robert T. Barrett1
Estimated H-index: 1
Despite a long-term (1989–2013) reduction in size of fish brought to Atlantic Puffin Fratercula arctica chicks and a parallel increase in numbers of fish in the food loads, there was no evidence of changes in chick growth rates at Hornoya, NE Norway. Recent declines in chick survival and cessation in population growth suggest, however, that environmental conditions have changed to an extent that breeding success is now compromised. Introduction Adult seabirds generally feed their chicks an energ...
Published on Jan 1, 2014in Ecosphere2.75
Aurore Ponchon8
Estimated H-index: 8
(CNRS: Centre national de la recherche scientifique),
David Grémillet46
Estimated H-index: 46
(UCT: University of Cape Town)
+ 6 AuthorsThierry Boulinier39
Estimated H-index: 39
(CNRS: Centre national de la recherche scientifique)
During breeding, long-lived species face important time and energy constraints that can lead to breeding failure when food becomes scarce. Despite the potential implications of intra-season dynamics in breeding failure for individual behavior, carry-over effects, dispersal decisions and population dynamics, little information is currently available on these dynamics at fine temporal scales. Here, we monitored the foraging behavior and the proportion of successful black-legged kittiwake pairs fro...
Published on May 1, 2013in Marine Biology2.13
Robert T. Barrett22
Estimated H-index: 22
Kjell Einar Erikstad35
Estimated H-index: 35
To gain a better understanding of population processes and in the light of the critically endangered status of the Common Guillemot Uria aalge in Norway, we investigate which environmental factors might affect the fitness of guillemot chicks as they depart from the nest site over a 16-year period on a colony in NE Norway. Although prey composition did not seem to influence the fledging body mass of the chicks, there were significant relationships between the yearly variations in chick body mass ...
Published on Jul 1, 2012in Ices Journal of Marine Science3.37
Edda Johannesen14
Estimated H-index: 14
Randi Ingvaldsen23
Estimated H-index: 23
+ 6 AuthorsJan Erik Stiansen9
Estimated H-index: 9
Long time-series of data from the Barents Sea (BS) are analysed to contrast the climate, fishing pressure, plankton, pelagic fish, demersal fish, and interactions between trophic levels in a recent decade (2000–2009) with the period 1970–1999. During the past four decades, fishing pressure and climatic conditions have varied greatly in the BS, and stock levels have fluctuated substantially. Trophic control has changed from mainly bottom–up to top–down, then back to mainly bottom–up. No clear evi...
Published on Feb 1, 2012in Bird Study1.01
Lorraine S. Chivers6
Estimated H-index: 6
('QUB': Queen's University Belfast),
Mathieu G. Lundy10
Estimated H-index: 10
Neil Reid15
Estimated H-index: 15
Capsule Despite substantial inter-annual and inter-specific variance in the composition of chick diet, the breeding success of Guillemots (Common Murres) Uria aalge and Razorbills Alca torda remained constant from 2008 to 2010. Aims To examine inter-specific and inter-annual differences in breeding success, chick provisioning behaviour and predation between two sympatric auk species. Methods Focal observations of breeding auks at Rathlin Island, Northern Ireland, during 2008, 2009 and 2010 recor...
Published on Aug 15, 1997in Sarsia
Olav Dragesund4
Estimated H-index: 4
(University of Bergen),
Arne Johannessen18
Estimated H-index: 18
(University of Bergen),
Øyvind Ulltang9
Estimated H-index: 9
(University of Bergen)
Abstract The Norwegian spring spawning herring has undergone great fluctuations in abundance and changes in migration. In the middle of this century the stock was in a productive phase, after which a serious depletion took place and the stock collapsed by the end of the 1960s. The primary factor for the collapse was high fishing pressure. A gradual, but small increase in the adult stock took place between 1974 and 1986. In this period the adult herring did not leave the coast after spawning to f...
Published on Mar 1, 2011in Journal of Field Ornithology1.85
Donald E. Lyons12
Estimated H-index: 12
(USGS: United States Geological Survey),
Daniel D. Roby29
Estimated H-index: 29
(USGS: United States Geological Survey)
For seabirds raising young under conditions of limited food availability, reducing chick provisioning and chick growth rates are the primary means available to avoid abandonment of a breeding effort. For mostseabirds,however,baselinedatacharacterizingchickgrowthanddevelopmentunderknownfeedingconditions are unavailable, so it is difficult to evaluate chick nutritional status as it relates to foraging conditions near breeding colonies. To address this need, we examined the growth and development o...
Published on Aug 1, 2009in The Condor2.80
Kyle W. Morrison3
Estimated H-index: 3
(SFU: Simon Fraser University),
J. Mark Hipfner9
Estimated H-index: 9
(SFU: Simon Fraser University)
+ 1 AuthorsDavid J. Green20
Estimated H-index: 20
(SFU: Simon Fraser University)
Abstract. In long-lived species, juvenile survival and the age at which individuals begin the process of recruitment have important consequences for individual fitness and population growth. We investigated how characteristics of fledglings (mass, wing length, and date) influenced the local survival of juveniles and age at first return to the natal breeding colony of two annual cohorts of the Tufted Puffin (Fratercula cirrhata) at Triangle Island, British Columbia. Although both cohorts were pro...
Published on Nov 8, 2007in Marine Ecology Progress Series2.36
Robert T. Barrett22
Estimated H-index: 22
(University of Tromsø)
Since 1980 the stock of Norwegian spring-spawning herring Clupea harengus has increased 10-fold to >5 × 10 6 t. This increase has probably played a vital role in repeated collapses in the capelin Mallotus villosus stock in the Barents Sea since the mid-1980s. After several decades of increase during a period of high capelin abundance in the Barents Sea, the population of black- legged kittiwakes Rissa tridactyla breeding in northern Norway started to decline in the early 1980s, reaching rates of...
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