Studies on the anatomical peculiarities of congenital cardiac disease, with explanations of their embryonic development, have been comparatively common. Attention has been focused upon the numerous deviations from the normal which may occur as a developmental anomaly, but comparatively few studies have been made upon the functional disturbance of the circulation. Further, little or no attention...

The Southern Ocean provides one of the largest environmental gradients on Earth that lacks geographical barriers, and small but highly mobile petrels living there may offer fine models of evolution of diversity along environmental gradients. Using geolocation devices, we investigated the winter distribution of closely related petrel species breeding sympatrically in the southern Indian Ocean, a...