Aim Global warming and other anthropogenic changes to the environment affect many
aspects of biology and have often been invoked as causing body size changes in …

Weather and climatic conditions may impact on the phenology and morphology of birds, and
thereby affect their survival rate and population dynamics. We examined the North Atlantic …

Unusual climatic events often lead to intense natural selection on organisms. Whether
episodic selection events result in permanent microevolutionary changes or are reversed by …

Behaviour has direct links to wing morphology in bird species. Many studies have postulated
migration to be one of the most important forces of selection acting on wing morphology …

Sexes cannot be distinguished with certainty by human observers in many avian species.
However, some apparently monomorphic species have small but measurable sexual …

Bird species following a loop migration strategy use different routes during autumn than in
the spring season. Birds nesting at different latitudes have different wing morphology …

There is a strong relationship between bird wing morphology and flight style. Wing shapes
are related to manoeuvrability, flight speed, energetic costs during flight and take-off speed …

Determining an individual's sex is often difficult in species with monomorphc plumage. but it
is important in many ecological studies. This study proposes a logistic function for sexing the …

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Drought is defined as an insufficiency of rainfall over an extended period of time. Drought
has affected a large number of smallholder farmers in the Free State province, and more …