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https://www.readbyqxmd.com/read/28431744/incidence-of-marine-debris-in-seabirds-feeding-at-different-water-depths
#1
D C Tavares, J F de Moura, A Merico, S Siciliano
Marine debris such as plastic fragments and fishing gears are accumulating in the ocean at alarming rates. This study assesses the incidence of debris in the gastrointestinal tracts of seabirds feeding at different depths and found stranded along the Brazilian coast in the period 2010-2013. More than half (55%) of the species analysed, corresponding to 16% of the total number of individuals, presented plastic particles in their gastrointestinal tracts. The incidence of debris was higher in birds feeding predominantly at intermediate (3-6m) and deep (20-100m) waters than those feeding at surface (<2m)...
April 18, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28431743/opportunistic-sampling-to-quantify-plastics-in-the-diet-of-unfledged-black-legged-kittiwakes-rissa-tridactyla-northern-fulmars-fulmarus-glacialis-and-great-cormorants-phalacrocorax-carbo
#2
Heidi Acampora, Stephen Newton, Ian O'Connor
Seabirds can interact with marine litter, mainly by entanglement or ingestion. The ingestion of plastics can lead to starvation or physical damage to the digestive tract. For chicks, it could additionally lead to reduced growth, affecting survival and fledging. This study quantified the ingestion of plastics by seabird chicks via an opportunistic sampling strategy. When ringing is carried out at colonies, birds may spontaneously regurgitate their stomach contents due to the stress or as a defence mechanism...
April 18, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28410026/variation-in-growth-drives-the-duration-of-parental-care-a-test-of-ydenberg-s-model
#3
Kyle H Elliott, Jannie F Linnebjerg, Chantelle Burke, Anthony J Gaston, Anders Mosbech, Morten Frederiksen, Flemming Merkel
The duration of parental care in animals varies widely, from none to lifelong. Such variation is typically thought to represent a trade-off between growth and safety. Seabirds show wide variation in the age at which offspring leave the nest, making them ideal to test the idea that a trade-off between high energy gain at sea and high safety at the nest drives variation in departure age (Ydenberg's model). To directly test the model assumptions, we attached time-depth recorders to murre parents (fathers [which do all parental care at sea] and mothers; [Formula: see text] of each)...
May 2017: American Naturalist
https://www.readbyqxmd.com/read/28407753/genomic-characterization-of-two-novel-pathogenic-avipoxviruses-isolated-from-pacific-shearwaters-ardenna-spp
#4
Subir Sarker, Shubhagata Das, Jennifer L Lavers, Ian Hutton, Karla Helbig, Jacob Imbery, Chris Upton, Shane R Raidal
BACKGROUND: Over the past 20 years, many marine seabird populations have been gradually declining and the factors driving this ongoing deterioration are not always well understood. Avipoxvirus infections have been found in a wide range of bird species worldwide, however, very little is known about the disease ecology of avian poxviruses in seabirds. Here we present two novel avipoxviruses from pacific shearwaters (Ardenna spp), one from a Flesh-footed Shearwater (A. carneipes) (SWPV-1) and the other from a Wedge-tailed Shearwater (A...
April 13, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28405388/diet-dichotomy-between-two-migrant-seabirds-breeding-near-a-high-arctic-polynya
#5
Isabeau Pratte, Kelly A Boadway, Shanti E Davis, Mark Maftei, Mark L Mallory
High Arctic polynyas are predictable areas of open water, which offer long-distance migrant seabirds a reliable source of food during a period when they have to replenish and accumulate energy for reproduction. Investigating the interaction between species nesting sympatrically in the vicinity of polynyas should provide insights into the role that such oceanographic features play for pre-breeding seabirds. We used stable isotopes (δ(13)C and δ(15)N) to compare the diet of two ground-nesting seabirds, Sabine's gull (Xema sabini) and Arctic tern (Sterna paradisaea), nesting on an island adjacent to a recurring polynya in the Canadian high Arctic in 2008 and 2009...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28405300/outlier-analyses-to-test-for-local-adaptation-to-breeding-grounds-in-a-migratory-arctic-seabird
#6
Anna Tigano, Allison J Shultz, Scott V Edwards, Gregory J Robertson, Vicki L Friesen
Investigating the extent (or the existence) of local adaptation is crucial to understanding how populations adapt. When experiments or fitness measurements are difficult or impossible to perform in natural populations, genomic techniques allow us to investigate local adaptation through the comparison of allele frequencies and outlier loci along environmental clines. The thick-billed murre (Uria lomvia) is a highly philopatric colonial arctic seabird that occupies a significant environmental gradient, shows marked phenotypic differences among colonies, and has large effective population sizes...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28405270/group-foraging-in-socotra-cormorants-a-biologging-approach-to-the-study-of-a-complex-behavior
#7
Timothée R Cook, Rob Gubiani, Peter G Ryan, Sabir B Muzaffar
Group foraging contradicts classic ecological theory because intraspecific competition normally increases with aggregation. Hence, there should be evolutionary benefits to group foraging. The study of group foraging in the field remains challenging however, because of the large number of individuals involved and the remoteness of the interactions to the observer. Biologging represents a cost-effective solution to these methodological issues. By deploying GPS and temperature-depth loggers on individuals over a period of several consecutive days, we investigated intraspecific foraging interactions in the Socotra cormorant Phalacrocorax nigrogularis, a threatened colonial seabird endemic to the Arabian Peninsula...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28387042/circumpolar-dynamics-of-a-marine-top-predator-track-ocean-warming-rates
#8
S Descamps, T Anker-Nilssen, R T Barrett, D B Irons, F Merkel, G J Robertson, N G Yoccoz, M L Mallory, W A Montevecchi, D Boertmann, Y Artukhin, S Christensen-Dalsgaard, K E Erikstad, H G Gilchrist, A L Labansen, S-H Lorentsen, A Mosbech, B Olsen, A Petersen, J-F Rail, H M Renner, H Strøm, G H Systad, S I Wilhelm, L Zelenskaya
Global warming is a non-linear process and temperature may increase in a stepwise manner. Periods of abrupt warming can trigger persistent changes in the state of ecosystems, also called regime shifts. The responses of organisms to abrupt warming and associated regime shifts can be unlike responses to periods of slow or moderate change. Understanding of non-linearity in the biological responses to climate warming is needed to assess the consequences of ongoing climate change. Here we demonstrate that the population dynamics of a long-lived, wide-ranging marine predator are associated with changes in the rate of ocean warming...
April 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28382443/presence-of-persistent-organic-pollutants-in-a-breeding-common-tern-sterna-hirundo-population-in-ireland
#9
Heidi Acampora, Philip White, Olga Lyashevska, Ian O'Connor
Persistent organic pollutants (POPs) are chemical compounds of environmental concern due to their toxic, persistent nature and their ability to bio-accumulate in biological tissue. Seabirds, for often being at the top of the food web, have been used as monitors of environmental pollutants. Adverse effects caused by POPs have been reported in common terns (Sterna hirundo) since the 1970s. Egg shell thinning, embryo and hatchling deformities have been reported for this species. Environmental legislation, such as the Oslo-Paris Convention (OSPAR), has agreed on the monitoring of concentration of POPs in common terns...
April 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28370751/effects-of-developmental-conditions-on-growth-stress-and-telomeres-in-black-legged-kittiwake-chicks
#10
Rebecca C Young, Jorg Welcker, Christopher P Barger, Scott A Hatch, Thomas Merkling, Evgenia V Kitaiskaia, Mark F Haussmann, Alexander S Kitaysky
Early-life conditions can drive ageing patterns and life history strategies throughout the lifespan. Certain social, genetic, and nutritional developmental conditions are more likely to produce high-quality offspring: those with good likelihood of recruitment and productivity. Here we call such conditions "favored states" and explore their relationship with physiological variables during development in a long-lived seabird, the black-legged kittiwake (Rissa tridactyla). Two favored states were experimentally generated by manipulation of food availability and brood size, while hatching order and sex were also explored as naturally generating favored states...
March 30, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28363050/intravenous-regional-antibiotic-perfusion-therapy-as-an-adjunctive-treatment-for-digital-lesions-in-seabirds
#11
Christine V Fiorello
Foot infections are a common problem among seabirds in wildlife rehabilitation. Pododermatitis and digital infections are often challenging to treat because of the presence of suboptimal substrates, abnormal weight-bearing due to injuries, and suboptimal nutritional or health status. Seabirds represent the majority of animals requiring rehabilitation after oil spills, and foot problems are a common reason for euthanasia among these birds. Antibiotic intravenous regional perfusion therapy is frequently used in humans and other species to treat infections of the distal extremities, but it has not been evaluated in seabirds...
March 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28356448/broad-scale-trophic-shift-in-the-pelagic-north-pacific-revealed-by-an-oceanic-seabird
#12
Peggy H Ostrom, Anne E Wiley, Helen F James, Sam Rossman, William A Walker, Elise F Zipkin, Yoshito Chikaraishi
Human-induced ecological change in the open oceans appears to be accelerating. Fisheries, climate change and elevated nutrient inputs are variously blamed, at least in part, for altering oceanic ecosystems. Yet it is challenging to assess the extent of anthropogenic change in the open oceans, where historical records of ecological conditions are sparse, and the geographical scale is immense. We developed millennial-scale amino acid nitrogen isotope records preserved in ancient animal remains to understand changes in food web structure and nutrient regimes in the oceanic realm of the North Pacific Ocean (NPO)...
March 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28355282/breeding-success-of-a-marine-central-place-forager-in-the-context-of-climate-change-a-modeling-approach
#13
Lauriane Massardier-Galatà, Jennifer Morinay, Frédéric Bailleul, Eric Wajnberg, Christophe Guinet, Patrick Coquillard
In response to climate warming, a southward shift in productive frontal systems serving as the main foraging sites for many top predator species is likely to occur in Subantarctic areas. Central place foragers, such as seabirds and pinnipeds, are thus likely to cope with an increase in the distance between foraging locations and their land-based breeding colonies. Understanding how central place foragers should modify their foraging behavior in response to changes in prey accessibility appears crucial. A spatially explicit individual-based simulation model (Marine Central Place Forager Simulator (MarCPFS)), including bio-energetic components, was built to evaluate effects of possible changes in prey resources accessibility on individual performances and breeding success...
2017: PloS One
https://www.readbyqxmd.com/read/28341155/anthropogenic-debris-in-the-nests-of-kelp-gulls-in-south-africa
#14
Minke Witteveen, Mark Brown, Peter G Ryan
Anthropogenic debris results in detrimental interactions with many marine species. Several seabirds include debris items in their nests, which can lead to entanglement of chicks and adults, resulting in injury or death. Anthropogenic debris was found in 4-67% of kelp gull Larus dominicanus nests in seven colonies in the Western Cape, South Africa. Nests contained two types of litter: items included in the nest structure during construction (mainly ropes and straps), and regurgitated items (mainly bags and food wrappers) that probably accumulate primarily during the chick-rearing period...
January 30, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28333458/declining-trends-of-polychlorinated-naphthalenes-in-seabird-eggs-from-the-canadian-arctic-1975-2014
#15
Birgit M Braune, Derek C G Muir
There are relatively few studies of polychlorinated naphthalenes (PCNs) for biota in polar regions and even fewer reports of temporal trends. We determined concentrations of PCNs in eggs of thick-billed murres (Uria lomvia) collected from the Canadian high Arctic between 1975 and 2014 and calculated their associated toxic equivalents (TEQs). Concentrations of Σ67PCN decreased significantly in the murre eggs between 1975 and 2014 at an average annual rate of -14.9 pg g(-1) wet weight. Although the penta- and tetra-CNs (predominantly CN-52/60 and CN-42) dominated the PCN profile, the hexa-CNs (mainly CN-66/67) accounted for the majority of the Σ67TEQ-PCN, concentrations of which also decreased significantly between 1975 to 2014...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28331585/phylogenetics-and-biogeography-of-the-two-wing-flyingfish-exocoetidae-exocoetus
#16
Eric A Lewallen, Andrew J Bohonak, Carolina A Bonin, Andre J van Wijnen, Robert L Pitman, Nathan R Lovejoy
Two-wing flyingfish (Exocoetus spp.) are widely distributed, epipelagic, mid-trophic organisms that feed on zooplankton and are preyed upon by numerous predators (e.g., tunas, dolphinfish, tropical seabirds), yet an understanding of their speciation and systematics is lacking. As a model of epipelagic fish speciation and to investigate mechanisms that increase biodiversity, we studied the phylogeny and biogeography of Exocoetus, a highly abundant holoepipelagic fish taxon of the tropical open ocean. Morphological and molecular data were used to evaluate the phylogenetic relationships, species boundaries, and biogeographic patterns of the five putative Exocoetus species...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28325173/patterns-and-processes-influencing-helminth-parasites-of-arctic-coastal-communities-during-climate-change
#17
K V Galaktionov
This review analyses the scarce available data on biodiversity and transmission of helminths in Arctic coastal ecosystems and the potential impact of climate changes on them. The focus is on the helminths of seabirds, dominant parasites in coastal ecosystems. Their fauna in the Arctic is depauperate because of the lack of suitable intermediate hosts and unfavourable conditions for species with free-living larvae. An increasing proportion of crustaceans in the diet of Arctic seabirds would result in a higher infection intensity of cestodes and acanthocephalans, and may also promote the infection of seabirds with non-specific helminths...
March 22, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28302954/contamination-status-and-accumulation-characteristics-of-heavy-metals-and-arsenic-in-five-seabird-species-from-the-central-bering-sea
#18
Chihiro Ishii, Yoshinori Ikenaka, Shouta M M Nakayama, Hazuki Mizukawa, Yared Beyene Yohannes, Yutaka Watanuki, Masaaki Fukuwaka, Mayumi Ishizuka
Seabirds are marine top predators and accumulate high levels of metals and metalloids in their tissues. Contamination by metals in the highly productive offshore region has become a matter of public concern. It is home to 80% of the seabird population in the USA, 95% of northern fur seals (Callorhinus ursinus), and major populations of Steller sea lions (Eumetopias jubatus), walruses (Odobenus rosmarus) and whales. Here, the concentrations of eight heavy metals (Hg, Cd, Cr, Co, Ni, Cu, Zn and Pb) and a metalloid (As) in the liver and kidneys of the northern fulmar (Fulmarus glacialis), thick-billed murre (Uria lomvia), short-tailed shearwater (Puffinus tenuirostris), tufted puffin (Fratercula cirrhata) and horned puffin (Fratercula corniculata) collected in the Bering Sea were measured...
March 13, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28266602/subglacial-discharges-create-fluctuating-foraging-hotspots-for-sea-birds-in-tidewater-glacier-bays
#19
Jacek Andrzej Urbanski, Lech Stempniewicz, Jan Marcin Węsławski, Katarzyna Dragańska-Deja, Agnieszka Wochna, Michał Goc, Lech Iliszko
Although the processes occurring at the front of an ice face in tidewater glacier bays still await thorough investigation, their importance to the rapidly changing polar environment is spurring a considerable research effort. Glacier melting, sediment delivery and the formation of seabird foraging hotspots are governed by subglacial discharges of meltwater. We have combined the results of tracking black-legged kittiwakes Rissa tridactyla equipped with GPS loggers, analyses of satellite images and in situ measurements of water temperature, salinity and turbidity in order to examine the magnitude and variability of such hotspots in the context of glacier bay hydrology...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28264057/combined-bio-logging-and-stable-isotopes-reveal-individual-specialisations-in-a-benthic-coastal-seabird-the-kerguelen-shag
#20
Elodie C M Camprasse, Yves Cherel, John P Y Arnould, Andrew J Hoskins, Charles-André Bost
Individual specialisations, which involve the repetition of specific behaviours or dietary choices over time, have been suggested to benefit animals by avoiding competition with conspecifics and increasing individual foraging efficiency. Among seabirds, resident and benthic species are thought to be good models to study inter-individual variation as they repetitively exploit the same environment. We investigated foraging behaviour, isotopic niche and diet in the Kerguelen shag Phalacrocorax verrucosus during both the incubation and chick-rearing periods for the same individuals to determine the effect of sex, breeding stage, body mass and morphometrics on mean foraging metrics and their consistency...
2017: PloS One
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