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Factors That Influence Assimilation Rates and Fractionation of Nitrogen and Carbon Stable Isotopes in Avian Blood and Feathers
TLDR
Differences in diet‐tissue discrimination factors before and after the diet switch may mean that toward the end of the experiment, some of the nutrients for blood synthesis had been coming from stores, and repeated measures mixed models provided evidence that increases in metabolic rate might accelerate fractional turnover rates in blood.
View on U Chicago Press
Assortative Mating as a Mechanism for Rapid Evolution of a Migratory Divide
TLDR
It is shown that recently evolved allopatric wintering populations of European blackcaps Sylvia atricapilla pair assortatively on their sympatric breeding grounds, describing an important process in the evolution of migratory divides, new migration routes, and wintering quarters.
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Marine renewable energy: potential benefits to biodiversity? An urgent call for research
Summary 1. The evidence for anthropogenically induced climate change is overwhelming with the production of greenhouse gases from burning fossil fuels being a key driver. In response, many…
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Individual responses of seabirds to commercial fisheries revealed using GPS tracking, stable isotopes and vessel monitoring systems
TLDR
The influence of commercial fisheries’ activity on the foraging behaviour of individual breeding northern gannets Morus bassanus is assessed and intra-population differences in discard consumption by gannet at-sea behaviour are revealed; differences that have impacts on foraging effort and body condition.
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Stable isotope ratios indicate that body condition in migrating passerines is influenced by winter habitat
TLDR
It is believed that variation in condition during migration may be one of the key factors determining differences in arrival times and condition at the breeding areas, which in turn have a major influence on reproductive success.
View on Royal Society
A forensic approach to understanding diet and habitat use from stable isotope analysis of (avian) claw material
TLDR
It is suggested that claws may offer a unique combination of attributes to the isotope ecologist: they are non-invasively sampled; metabolically inert but grow continuously, and are therefore a more flexible tool than feathers.
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Changes in fisheries discard rates and seabird communities
TLDR
Reduced rates of discarding, particularly when coupled with reduced availability of small shoaling pelagic fish such as sandeel, result in an increase in predation by great skuas on other birds.
View on Nature
Potential consequences of discard reform for seabird communities
TLDR
The potential for both negative and positive impacts of discard reforms for seabirds are considered, with particular focus on the EU, and recommendations for ongoing research and conservation are proposed.
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Space Partitioning Without Territoriality in Gannets
TLDR
It is found that northern gannets, satellite-tracked from 12 neighboring colonies, nonetheless forage in largely mutually exclusive areas and that these colony-specific home ranges are determined by density-dependent competition.
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Long-term individual foraging site fidelity--why some gannets don't change their spots.
TLDR
It is hypothesized that site familiarity, accrued early in-life, causes IFSF by canalizing subsequent foraging decisions, with far-reaching consequences for attempts to understand and conserve these animals in a rapidly changing environment.
View on PubMed
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