Common declines

Common declines

While the Whale and Dolphin Conservation Society have highlighted for the British government's attention and beyond the plight of cetaceans in its seas (see pages R780–R781), the government itself acknowledged last month the need for tougher conservation measures for many once common species and habitats in the face of often increasingly alarming decline. The British government announced a doub...

Cognitive and sensory declines in old age: gauging the evidence for a common cause.

Resource accounts of behavioral aging postulate that age-associated impairments within and across intellectual and sensory domains reflect, in part, a common set of senescent alterations in the neurochemistry and neuroanatomy of the aging brain. Hence, these accounts predict sizeable correlations of between-person differences in rates of decline, both within and across intellectual and sensory ...

Emerging Infectious Disease Leads to Rapid Population Declines of Common British Birds

Emerging infectious diseases are increasingly cited as threats to wildlife, livestock and humans alike. They can threaten geographically isolated or critically endangered wildlife populations; however, relatively few studies have clearly demonstrated the extent to which emerging diseases can impact populations of common wildlife species. Here, we report the impact of an emerging protozoal disea...

Retirement age declines

Response: Sperm Density Declines

Last year Swan et al. (1) published a reanalysis of data from 61 studies originally compiled and analyzed by Carlsen et al. (2). Just prior to the appearance of the Swan et al. artide, we published a reanalysis in another journal (3). Regional differences were considered in both reanalyses, but we examined only the effect ofyear in the final models (fertility status was also considered in the i...