Ecology Letters (2010) 13: 1055–1071 Abstract Whereas many land predators disappeared
before their ecological roles were studied, the decline of marine apex predators is still …

There is growing recognition of the important roles played by predators in regulating
ecosystems and sustaining biodiversity. Much attention has focused on the consequences of …

Although both food availability and predation risk have been hypothesized to affect dolphin
habitat use and group size, no study has measured both factors concurrently to determine …

Among the most common statements made in studies of elasmobranch ecology is
something to the effect that “sharks play an important role in marine ecosystems.” Although …

This report provides a review of our knowledge of the bycatches, defined as discarded dead,
from the tropical tuna purse seine fisheries of the world. The major fishing grounds involved …

The evolutionary forces that drive fitness variation in species are of considerable interest.
Despite this, the relative importance and interactions of genetic and social factors involved in …

Dolphins live in complex social groupings with a wide variety of social strategies. In this
chapter we investigate the role that differing habitats and ecological conditions have played …

Mixed species groups have long been noted in birds, but they also occur among different
species of mammals ranging from closely related species to species from different orders …

The impact of human activity is evident in the depletion of fish populations worldwide. This
being the case, there is an urgent need to discover the true biodiversity of the world before …

ABSTRACT 1 The significance of killer whale Orcinus orca predation on baleen whales
(Mysticeti) has been a topic of considerable discussion and debate in recent years …