BREEDING ECOLOGY AND EVIDENCE OF REPRODUCTIVE ISOLATION OF A WIDESPREAD STICKLEBACK FISH (GASTEROSTEIDAE) IN NOVA-SCOTIA, CANADA
BREEDING ECOLOGY AND EVIDENCE OF REPRODUCTIVE ISOLATION OF A WIDESPREAD STICKLEBACK FISH (GASTEROSTEIDAE) IN NOVA-SCOTIA, CANADA
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DOI：
10.1111/j.1095-8312.1990.tb00512.x
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发表时间：
1990-03-01
影响因子：
1.9
通讯作者：
HAGEN, DW
中科院分区：
文献类型：
--
作者：
BLOUW, DM;HAGEN, DW
一种背部繁殖颜色鲜艳的白色棘鱼广泛分布在加拿大东北部的新斯科舍省，在那里它经常与三棘鱼Gasterosteus aculeatus同域繁殖。繁殖雄性在20米或更远的距离上是非常显眼和可见的，而同域的G。刺孔虫是隐蔽的，即使在2米处也难以发现。白色棘鱼仅在丝状藻类的基质上筑巢，而G. Aculeatus只在基质上筑巢。白色棘鱼的体型比G.棘，但在形态上相似，有一个完整的侧板和鳃耙数。白色棘鱼只出现在有丝状藻类（这似乎是一个强制性的筑巢基质）的环境中，而且水是清澈的，含盐的，相对静止的。实验室的雌性选择试验表明，白色棘鱼在生殖上与G. aculeatus，和自然产卵的实地观察支持这一结论。我们认为，明亮的繁殖颜色可能是通过性选择和/或广告盈利的掠食者。
A stickleback with brillant white dorsal breeding colours is widely distributed in north-eastern Nova Scotia, Canada, where it often breeds sympatrically with the threespine stickleback, Gasterosteus aculeatus. Breeding males are highly conspicuous and visible at distances of 20 m or more whereas sympatric G. aculeatus are cryptic and difficult to detect even at 2 m. The white stickleback nests only above the substrate in filamentous algae, whereas G. aculeatus nests only on the substrate. The white stickleback is smaller in size and more terete than G. aculeatus, but it is morphologically similar in having a complete row of lateral plate and gill raker numbers. The white stickleback occurs only in environments where there are filamentous algae (which appears to be an obligatory nesting substrate) and where the water is clear, saline and relatively still. Female choice tests in the laboratory show that the white stickleback is reproductively isolated from G. aculeatus, and field observations on natural spawning support this conclusion. We suggest that the bright breeding colouration may have evolved through sexual selection and/or to advertise unprofitability to predators.