Editor´s Choice

Editor´s choice - Ratios, adaptations, and metabolic capability of avian flight muscles

The adaptive variation in avian body composition has for a long time been interesting from an energy turn-over point of view. Besides being inferred as the basis of variation in basal metabolic rate, such variation is also important for generating work as for example...

Editor´s choice - Sexual pigmentation and parental risk-taking in yellow warblers

Increased perceived predation risk during breeding is predicted to reduce parental effort as such behaviours often are conspicuous and are traded off against vigilance...

Editor´s choice - Automated tracking of wild hummingbird body mass

A male ruby-throated hummingbird approaches an artificial feeder outfitted with a passive-integrated transponder reader and a precision electronic balance. As this bird perches to feed its ID is detected and its mass is automatically recorded.

Editor´s Choice: Avian body size change in response to environmental change

That avian populations respond to climate change by changes in phenology and distribution is well known but should we predict any consistent trends in body size?

Editor´s Choice - Movements and breeding dispersal of Snowy owls

Tracking snowy owls has been (and still is) a great challenge. The fact that those birds are highly mobile, that they show almost no breeding site fidelity and disperse over huge distances from one year to another yet increases the challenge.

Costs of rearing and sex-ratio variation

The broods of most avian species are composed of about equal numbers of males and females. However, under certain circumstances the brood sex ratio has been found to deviate from unity and as such situations are of special interest for evolutionary...

Editor´s Choice - Negative Impact of geolocators

Tiny light-level geolocators with a mass of less than 1 gram give great hopes that it will be possible to reveal the annual migratory journeys of many small songbirds on an individual level, but evidence are also accumulating that equipping a small bird...

Editor´s Choice - Impressive seabird foraging studies

Rapid advances are now being made in the knowledge of the amazing foraging journeys undertaken also b y the smallest pelagic seabirds, thanks to the use of miniaturized geolocators (light loggers). Two impressive studies are published in this issue...

Editor´s Choice - Colonization pathways of the northeast Atlantic by northern fulmars

The fulmar Fulmarus glacialis has expanded greatly in the North Atlantic during the recent 350 years, as compiled and analyzed from faunistic historical literature by James Fisher. This expansion may have started from either or both of the two oldest breeding...

Editor´s Choice: Avian malaria is associated with increased reproductive investment

High quality individuals or Terminal investment? Avian malaria parasites, e.g. Haemoproteus and Plasmodium, are commonly found in many bird species. Studies aiming at estimating these parasites’ fitness effects have typically either found no effect or...

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