Markofsky J, Matias J R
J Exp Zool. 1977 Oct;202(1):49-56. doi: 10.1002/jez.1402020107.
Annual fish are found in temporary bodies of water in habitats of alternating rainy and dry seasons. The populations survive the dry seasons in the form of embryos encased in the bottom mud. Several genera of annual fish have been reported to exhibit diapause (developmental arrest) at three specific stages of development and it has been proposed that through this adaptation the populations are able to survive the variable durations of the dry seasons. The effects of incubation ans spawning temperatures, and season of collection on the onset and duration of diapause in laboratory populations of the annual fish, Nothobranchius guentheri, were studied. At low incubation and spawning temperatures there was a prolongation of Diapause I and Diapause II. In addition, fish spawned at 25 degrees C during the short days of winter produced embryos that entered a prolonged duration of Diapause II, whereas embryos produced during the long days of summer bypassed Diapause II.
一年生鱼类生活在雨季和旱季交替的栖息地中的临时性水体中。其种群以包裹在底部淤泥中的胚胎形式度过旱季。据报道，几种一年生鱼类在发育的三个特定阶段会出现滞育（发育停滞），有人提出，通过这种适应方式，种群能够在旱季持续时间不定的情况下生存下来。研究了孵化和产卵温度以及采集季节对一年生鱼类冈氏假鳃鳉实验室种群滞育开始和持续时间的影响。在较低的孵化和产卵温度下，滞育I期和滞育II期会延长。此外，在冬季短日照期间于25摄氏度下产卵的鱼所产生的胚胎会进入延长的滞育II期，而在夏季长日照期间产生的胚胎则绕过滞育II期。
