Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403-5289, USA.
J Fish Biol. 2009 Nov;75(8):2075-81. doi: 10.1111/j.1095-8649.2009.02418.x.
Reproductive maturation in both male and female three-spined stickleback Gasterosteus aculeatus was strongly photoperiodic in a northern population (Alaska, 61 degrees N) but not in a southern population (Oregon, 43 degrees N) from western North America. Increasing reliance on photoperiod with increasing latitude is a general phenomenon among vertebrates, and is probably due to the anticipation of a narrower window of opportunity for reproduction and development at higher latitudes.
在北美洲西部，北方种群（阿拉斯加，北纬 61 度）的三刺鱼雌雄两性的生殖成熟强烈地受光周期的影响，但南方种群（俄勒冈，北纬 43 度）却不受影响。随着纬度的增加而越来越依赖于光周期，这是脊椎动物的普遍现象，可能是因为在高纬度地区，繁殖和发育的机会窗口更窄。
