Call Patterns and Basilar Papilla Tuning in Cricket Frogs. I. Differences among Populations and between Sexes
Male cricket frogs (Acris crepitans) produce a broad-band, high frequency advertisement call with a single spectral peak (the dominant frequency). We measured the dominant frequencies of male calls from six populations in central Texas and one from Indiana and compared them to the tuning of basilar papilla afferents in males and females. Averaging over all […]
Geographic variation in beak colouration in gentoo penguins Pygoscelis papua
Ornamental colouration is often due to carot-enoid pigments and varies inter- and intra-specifically. This paper reports on variation in beak colour of the gentoo penguin, Pygoscelis papua, corresponding to different geographical locations along a latitudinal gradient in the Antarctic Peninsula (from King George Island (62815 0 S– 58837 0 W) to Ronge´Island (64840 0 S–62840 […]
Behavioural plasticity may compensate for climate change in a long-lived reptile with temperature-dependent sex determination
How are organisms responding to climate change? The rapidity with which climate is changing suggests that, in species with long generation times, adaptive evolution may be too slow to keep pace with climate change, and that alternative mechanisms, such as behavioural plasticity, may be necessary for population persistence. Species with temperature-dependent sex determination may be […]