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https://www.readbyqxmd.com/read/28734075/high-occurrence-of-jellyfish-predation-by-black-browed-and-campbell-albatross-identified-by-dna-metabarcoding
#1
Julie C McInnes, Rachael Alderman, Mary-Anne Lea, Ben Raymond, Bruce E Deagle, Richard A Phillips, Andrew Stanworth, David R Thompson, Paulo Catry, Henri Weimerskirch, Cristián G Suazo, Michaël Gras, Simon N Jarman
Gelatinous zooplankton are a large component of the animal biomass in all marine environments, but are considered to be uncommon in the diet of most marine top predators. However, the diets of key predator groups like seabirds have conventionally been assessed from stomach content analyses, which cannot detect most gelatinous prey. As marine top predators are used to identify changes in the overall species composition of marine ecosystems, such biases in dietary assessment may impact our detection of important ecosystem regime shifts...
July 22, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28715294/avian-pox-discovered-in-the-critically-endangered-waved-albatross-phoebastria-irrorata-from-the-gal%C3%A3-pagos-islands-ecuador
#2
Emily M Tompkins, David J Anderson, Kristy L Pabilonia, Kathryn P Huyvaert
The Waved Albatross (Phoebastria irrorata) is a critically endangered seabird in a rapidly shrinking population in the Galápagos Islands, Ecuador. The introduction of novel pathogens and parasites poses a threat to population persistence. Monitoring disease prevalence and guarding against the spread of such agents in endemic taxa are conservation priorities for the Galápagos, where recent increases in the prevalence of avian pox may have contributed to population declines and range contractions in other bird species...
July 17, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28701505/remotely-sensed-wind-speed-predicts-soaring-behaviour-in-a-wide-ranging-pelagic-seabird
#3
Rory Gibb, Akiko Shoji, Annette L Fayet, Chris M Perrins, Tim Guilford, Robin Freeman
Global wind patterns affect flight strategies in many birds, including pelagic seabirds, many of which use wind-powered soaring to reduce energy costs during at-sea foraging trips and migration. Such long-distance movement patterns are underpinned by local interactions between wind conditions and flight behaviour, but these fine-scale relationships are far less well understood. Here we show that remotely sensed ocean wind speed and direction are highly significant predictors of soaring behaviour in a migratory pelagic seabird, the Manx shearwater (Puffinus puffinus)...
July 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28695260/challenges-to-oil-spill-assessment-for-seabirds-in-the-deep-ocean
#4
J Christopher Haney, Patrick G R Jodice, William A Montevecchi, David C Evers
We synthesize impediments for evaluating effects to seabirds from open ocean hydrocarbon releases. Effects on seabirds from ship discharges, spills, and well blowouts often are poorly detected and monitored far from land. Regulatory regimes for ocean spills can result in monitoring efforts that are not entirely transparent. We illustrate how interdisciplinary technologies address deficits that hamper individual or population level assessments for seabirds, and we demonstrate where emerging technologies might be engaged to bridge gaps in oil spill monitoring...
July 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28695256/anomalously-high-recruitment-of-the-2010-gulf-menhaden-brevoortia-patronus-year-class-evidence-of-indirect-effects-from-the-deepwater-horizon-blowout-in-the-gulf-of-mexico
#5
Jeffrey W Short, Harold J Geiger, J Christopher Haney, Christine M Voss, Maria L Vozzo, Vincent Guillory, Charles H Peterson
Gulf menhaden (Brevoortia patronus) exhibited unprecedented juvenile recruitment in 2010 during the year of the Deepwater Horizon well blowout, exceeding the prior 39-year mean by more than four standard deviations near the Mississippi River. Abundance of that cohort remained exceptionally high for two subsequent years as recruits moved into older age classes. Such changes in this dominant forage fish population can be most parsimoniously explained as consequences of release from predation. Contact with crude oil induced high mortality of piscivorous seabirds, bottlenose dolphin (Tursiops truncatus), waders, and other fish-eating marsh birds, all of which are substantial consumers of Gulf menhaden...
July 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28694838/how-animals-distribute-themselves-in-space-variable-energy-landscapes
#6
Juan F Masello, Akiko Kato, Julia Sommerfeld, Thomas Mattern, Petra Quillfeldt
BACKGROUND: Foraging efficiency determines whether animals will be able to raise healthy broods, maintain their own condition, avoid predators and ultimately increase their fitness. Using accelerometers and GPS loggers, features of the habitat and the way animals deal with variable conditions can be translated into energetic costs of movement, which, in turn, can be translated to energy landscapes.We investigated energy landscapes in Gentoo Penguins Pygoscelis papua from two colonies at New Island, Falkland/Malvinas Islands...
2017: Frontiers in Zoology
https://www.readbyqxmd.com/read/28690792/the-most-common-diet-results-in-low-reproduction-in-a-generalist-seabird
#7
Susanne van Donk, Kees C J Camphuysen, Judy Shamoun-Baranes, Jaap van der Meer
Dietary specialization has been described across a wide range of taxa in the animal kingdom. Fitness consequences are, however, not well documented. We examined the reproductive consequences of different dietary specializations in the herring gull Larus argentatus, an omnivorous seabird, using an extensive dataset which includes breeding and dietary data of 10 successive years. We hypothesized that pairs that focused on prey of higher energetic value would yield higher fledging rates. An alternative hypothesis is that pairs that relied on more resources simultaneously would reproduce better...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28683918/enzymology-of-microbial-dimethylsulfoniopropionate-catabolism
#8
Mishtu Dey
The biochemistry of dimethylsulfoniopropionate (DMSP) catabolism is reviewed. The microbes that catalyze the reactions central to DMSP catabolic pathways are described, and the focus is on the enzymology of the process. Approximately 10(9)tons of DMSP is released annually by marine eukaryotes as an osmolyte. A vast majority of DMSP is assimilated by bacteria through either a demethylation or lyase pathways, producing either the methane thiol or the volatile dimethylsulfide (DMS), respectively. Enzymatic breakdown of DMSP generates ~10(7)tons of DMS annually, which may have impact on global climate...
2017: Advances in Protein Chemistry and Structural Biology
https://www.readbyqxmd.com/read/28679381/does-genetic-structure-reflect-differences-in-non-breeding-movements-a-case-study-in-small-highly-mobile-seabirds
#9
Petra Quillfeldt, Yoshan Moodley, Henri Weimerskirch, Yves Cherel, Karine Delord, Richard A Phillips, Joan Navarro, Luciano Calderón, Juan F Masello
BACKGROUND: In seabirds, the extent of population genetic and phylogeographic structure varies extensively among species. Genetic structure is lacking in some species, but present in others despite the absence of obvious physical barriers (landmarks), suggesting that other mechanisms restrict gene flow. It has been proposed that the extent of genetic structure in seabirds is best explained by relative overlap in non-breeding distributions of birds from different populations. We used results from the analysis of microsatellite DNA variation and geolocation (tracking) data to test this hypothesis...
July 5, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28674385/sea-ice-phenology-and-primary-productivity-pulses-shape-breeding-success-in-arctic-seabirds
#10
Francisco Ramírez, Arnaud Tarroux, Johanna Hovinen, Joan Navarro, Isabel Afán, Manuela G Forero, Sébastien Descamps
Spring sea ice phenology regulates the timing of the two consecutive pulses of marine autotrophs that form the base of the Arctic marine food webs. This timing has been suggested to be the single most essential driver of secondary production and the efficiency with which biomass and energy are transferred to higher trophic levels. We investigated the chronological sequence of productivity pulses and its potential cascading impacts on the reproductive performance of the High Arctic seabird community from Svalbard, Norway...
July 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28672247/biomagnification-of-persistent-organic-pollutants-in-a-deep-sea-temperate-food-web
#11
Sonia Romero-Romero, Laura Herrero, Mario Fernández, Belén Gómara, José Luis Acuña
Polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) and polychlorinated dibenzo-p-dioxins and -furans (PCDD/Fs) were measured in a temperate, deep-sea ecosystem, the Avilés submarine Canyon (AC; Cantabrian Sea, Southern Bay of Biscay). There was an increase of contaminant concentration with the trophic level of the organisms, as calculated from stable nitrogen isotope data (δ(15)N). Such biomagnification was only significant for the pelagic food web and its magnitude was highly dependent on the type of top predators included in the analysis...
June 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28672148/perfluorinated-substances-and-telomeres-in-an-arctic-seabird-cross-sectional-and-longitudinal-approaches
#12
Pierre Blévin, Frédéric Angelier, Sabrina Tartu, Paco Bustamante, Dorte Herzke, Børge Moe, Claus Bech, Geir Wing Gabrielsen, Jan Ove Bustnes, Olivier Chastel
Telomeres are non-coding DNA repeats located at the termini of eukaryotic chromosomes, regulated by dynamic processes balancing shortening and maintenance. Despite a mechanism to slow-down telomere shortening, cell division leads to progressive attrition of chromosomes, leading to the onset of cellular senescence or apoptosis. However, telomere restoration based on telomerase activity is the primary mechanism for telomere maintenance. Telomere length is associated to health and survival and can be impacted by a broad panel of environmental factors...
June 30, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28658643/implicit-assumptions-underlying-simple-harvest-models-of-marine-bird-populations-can-mislead-environmental-management-decisions
#13
Susan H O'Brien, Aonghais S C P Cook, Robert A Robinson
Assessing the potential impact of additional mortality from anthropogenic causes on animal populations requires detailed demographic information. However, these data are frequently lacking, making simple algorithms, which require little data, appealing. Because of their simplicity, these algorithms often rely on implicit assumptions, some of which may be quite restrictive. Potential Biological Removal (PBR) is a simple harvest model that estimates the number of additional mortalities that a population can theoretically sustain without causing population extinction...
June 25, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28653410/breeding-density-fine-scale-tracking-and-large-scale-modeling-reveal-the-regional-distribution-of-four-seabird-species
#14
Ewan D Wakefield, Ellie Owen, Julia Baer, Matthew J Carroll, Francis Daunt, Stephen G Dodd, Jonathan A Green, Tim Guilford, Roddy A Mavor, Peter I Miller, Mark A Newell, Stephen F Newton, Gail S Robertson, Akiko Shoji, Louise M Soanes, Stephen C Votier, Sarah Wanless, Mark Bolton
Population-level estimates of species' distributions can reveal fundamental ecological processes and facilitate conservation. However, these may be difficult to obtain for mobile species, especially colonial central-place foragers (CCPFs; e.g. bats, corvids, social insects), because it is often impractical to determine the provenance of individuals observed beyond breeding sites. Moreover, some CCPFs, especially in the marine realm (e.g. pinnipeds, turtles and seabirds) are difficult to observe because they range 10s to 10,000s km from their colonies...
June 27, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28644081/effects-of-added-lipids-on-digestibility-and-nitrogen-balance-in-oiled-common-murres-uria-aalge-and-western-grebes-aechmophorus-occidentalis-fed-four-formulations-of-a-critical-care-diet
#15
Rebecca S Duerr, Kirk C Klasing
Nutritional support is a primary therapy administered to oiled animals during responses to oil spills, but data informing nutritional decision-making during events are limited. In this study, 44 common murres ( Uria aalge ) and 6 Western grebes ( Aechmophorus occidentalis ), naturally oiled by oceanic seeps off the coast of Ventura and Santa Barbara Counties, CA, USA, were assigned to 1 of 4 groups fed diets with varying levels (6.8% [no added oil], 11%, and 20%) and types (salmon, corn) of oil added to a partially purified basal diet...
June 2017: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/28625618/low-incidence-of-plastics-in-food-loads-delivered-to-nestlings-by-a-zooplanktivorous-seabird-over-a-21-year-period
#16
J M Hipfner, K R Studholme, M Galbraith
We quantified the amount of plastic found in food loads delivered to nestlings in Cassin's Auklet (Ptychoramphus aleuticus), a small, zooplanktivorous seabird, on Triangle Island, British Columbia, in 1996-2016. The density of plastic in surrounding waters is moderately high, yet few food loads contained any plastic (3 of 850), and none more than two pieces. That result accords well with previous observations on the other four North Pacific auklets (Aethia spp.), leading us to conclude that true auklets rarely transfer plastic to nestlings...
June 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28623288/seabirds-supply-nitrogen-to-reef-building-corals-on-remote-pacific-islets
#17
Anne Lorrain, Fanny Houlbrèque, Francesca Benzoni, Lucie Barjon, Laura Tremblay-Boyer, Christophe Menkes, David P Gillikin, Claude Payri, Hervé Jourdan, Germain Boussarie, Anouk Verheyden, Eric Vidal
Seabirds concentrate nutrients from large marine areas on their nesting islands playing an important ecological role in nutrient transfer between marine and terrestrial ecosystems. Here we investigate the role of guano on corals reefs across scales by analyzing the stable nitrogen isotopic (δ(15)N) values of the scleractinian coral Pocillopora damicornis on fringing reefs around two Pacific remote islets with large seabird colonies. Marine stations closest to the seabird colonies had higher nitrate + nitrite concentrations compared to more distant stations...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28620577/population-structure-of-the-soft-tick-ornithodoros-maritimus-and-its-associated-infectious-agents-within-a-colony-of-its-seabird-host-larus-michahellis
#18
Marlene Dupraz, Céline Toty, Elodie Devillers, Thomas Blanchon, Eric Elguero, Marion Vittecoq, Sara Moutailler, Karen D McCoy
The epidemiology of vector-borne zoonoses depends on the movement of both hosts and vectors, which can differ greatly in intensity across spatial scales. Because of their life history traits and small size, vector dispersal may be frequent, but limited in distance. However, little information is available on vector movement patterns at local spatial scales, and particularly for ticks, transmitting the greatest diversity of recognized infectious agents. To test the degree to which ticks can disperse and disseminate pathogens at local scales, we investigated the temporal dynamics and population structure of the soft tick Ornithodoros maritimus within a colony of its seabird host, the Yellow-legged gull Larus michahellis...
August 2017: International Journal for Parasitology. Parasites and Wildlife
https://www.readbyqxmd.com/read/28616169/host-sympatry-and-body-size-influence-parasite-straggling-rate-in-a-highly-connected-multihost-multiparasite-system
#19
Jose L Rivera-Parra, Iris I Levin, Kevin P Johnson, Patricia G Parker
Parasite lineages commonly diverge when host lineages diverge. However, when large clades of hosts and parasites are analyzed, some cases suggest host switching as another major diversification mechanism. The first step in host switching is the appearance of a parasite on an atypical host, or "straggling." We analyze the conditions associated with straggling events. We use five species of colonially nesting seabirds from the Galapagos Archipelago and two genera of highly specific ectoparasitic lice to examine host switching...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28598528/use-of-radar-detectors-to-track-attendance-of-albatrosses-at-fishing-vessels
#20
H Weimerskirch, D P Filippi, J Collet, S M Waugh, S C Patrick
Despite international waters covering over 60% of the world's oceans, our understanding of how fisheries in these regions shape ecosystem processes is surprisingly poor. Seabirds are known to forage at fishing vessels, with potential deleterious effects for their population, but the extent of overlap and behavior in relation to ships are poorly known. Using novel biologging devices, which can detect radar emissions to record the position of boats and seabirds, we measured the true extent of the overlap between seabirds and fishing vessels, and generated estimates of the intensity of fishing and distribution of vessels in international waters...
June 9, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
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