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Maternal kinship and fisheries interaction influence killer whale social structure

The primary prey of killer whales in the Strait of Gibraltar is the bluefin tuna. All killer whales observed in this area hunt tuna by chasing individual fish until they become exhausted and can be...

Comparing techniques for measuring corticosterone in tadpoles

Glucocorticoids play a key role in the stress response in vertebrates. In particular, corticosterone (CORT) is the main glucocorticoid in amphibians, birds, and reptiles.The most common methods for...

Noninvasive sampling of saliva for genetic analysis in ecology

Saliva is a secretion rich in epithelial cells and an excellent source of DNA for genetic analysis. Attempts to identify wild vertebrates from noninvasive samples of saliva have been restricted to...

Colony size and foraging range in seabirds

The reasons for variation in group size among animal species remain poorly understood. Using ‘Ashmole’s halo’ hypothesis of food depletion around colonies, authors predict that foraging range...

Spatial distribution of marine predators

Identifying the main factors affecting the spatial distribution of marine predators is essential in order to evaluate their distribution patterns, predict the potential impact of human activities...