银鱼的幼态持续及其在天演上的意义

幼态持续现象(Neoteny)在无脊椎动物的昆虫纲和甲壳纲以及脊椎动物的两栖类是比较常见的。       

INFORMATION: MATERNITY PRACTICES IN HOSPITALS IN CALIFORNIA

Many forms of therapy have been tried for aphthous stomatitis in the past without success. The effect of hydrocortisone was tested because of its anti-inflammatory and antiallergic action. Little benefit was derived from such therapy in a series of 26 patients as far as healing time was concerned but many were noticeably relieved of pain.     

CETACEANS OF THE NORTHERN GULF OF CALIFORNIA: DISTRIBUTION, OCCURRENCE, and RELATIVE ABUNDANCE

A total of 1,715 km of boat-based surveys and 1,521 km of aircraft-based surveys was conducted from 1986–1989 to assess the distribution, relative abundance, and ecological relationships of cetaceans in the northern Gulf of California. Seven cetacean species were seen; in decreasing frequency of groups encountered they were: bottlenose dolphins, Tursiops truncatus ; vaquitas, Phocoena sinus ; common dolphins, Delphinus delphis ; fin whales, Balaenoptera physalus ; Bryde's whales, B. edeni ; gray whales, Eschrichtius robustus , and killer whales, Orcinus orca. Common dolphins were numerically dominant and bottlenose dolphins were seen most often. Bryde's whales and vaquitas had the smallest group sizes. In general, the odontocete cetaceans were separated spatially, whereas the distribution of Bryde's and fin whales overlapped considerably.