Previous research presents a mixed picture of seasonal variation in the hippocampus of food-storing black-capped chickadees. One field study has shown an October peak in hippocampus volume, although laboratory studies conducted to determine whether photoperiod regulates this seasonal growth have failed to find changes in the size of the hippocampus. To resolve the discrepancy between field and ...

This article reports a study of attitudes and beliefs about seasonal psychological cycles in a sample of 160 people living in London. Participants rated their perceptions of seasonal fluctuations on cognitive, emotional, physical, and social functioning in themselves, in others at the same latitude, and in the Arctic population by means of the Seasonal Pattern Assessment Questionnaire and a spe...

A question of interest is whether there is evidence of larger seasonal change for certain subgroups of subjects. One possibility is that there is a relationship between the amount of seasonal change and baseline values of other variables. We examined this possibility by constructing simple correlations between cholesterol (winter-summer) changes and average levels of other variables. For exampl...

Understanding species responses to global change will help predict shifts in species distributions as well as aid in conservation. Changes in the timing of seasonal activities of organisms over time may be the most responsive and easily observable indicator of environmental changes associated with global climate change. It is unknown how global climate change will affect species distributions a...

The majority of the world’s forests occur where there is a dry season long enough to affect a seasonal change in the forest community. The seasonal forest may include evergreen, semi-deciduous, deciduous trees, or some combination of these. Local differences in soil or other site characteristics often determine which community persists. Since the seasonal forests exist where there is seasonal p...

Climatic and subsequent habitat change has often been invoked as a driving force of evolutionary change in hominins, mammals, and other taxa (Vrba 1988a, 1988b, 1992, 1995; Bromage & Schrenk 1999; Potts 1998; Bobe & Eck 2001; Janis et al. 2002). Global climatic change in the mid Pliocene Epoch has been suggested as a cause for hominin speciation events (Vrba 1995) and is correlated with changes...

Antarctic krill, Euphausia superba, is very susceptible to harmful solar radiation because of its unique genetic setup. Exposure occurs in spring to autumn during vertical diel migration and during occasional daytime surface-swarming. We have investigated colour change in Antarctic krill, Euphausia superba, during summer and winter in the Lazarev Sea in response to ultraviolet radiation (UVR) a...

Understanding how risks to human health change as a result of seasonal variations in environmental conditions is likely to become of increasing importance in the context of climatic change, especially in lower-income countries. A multi-disciplinary approach can be a useful tool for improving understanding, particularly in situations where existing data resources are limited but the environmenta...