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首页> 外文期刊>Environmental Biology of Fishes >Diverse reproductive patterns of Bluehead Chub (Nocomis leptocephalus) and their relationships with nest size and interactions with an associate, Yellowfin Shiner (Notropis lutipinnis)
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Diverse reproductive patterns of Bluehead Chub (Nocomis leptocephalus) and their relationships with nest size and interactions with an associate, Yellowfin Shiner (Notropis lutipinnis)

机译：蓝头糖霜（Nocomis Leptocephalus）的不同繁殖模式及其与巢大小和与助理，Yellowfin Shiner（Notropis Lutipinnis）的关系的关系

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摘要

Nest construction by males is a common reproductive strategy in fishes, but little is known about intra-specific variation in nesting behavior and reproductive interactions with other species. In the southeastern USA, reproductive interactions between bluehead chub (Nocomis leptocephalus) and their nest associate, such as yellowfin shiner (Notropis lutipinnis), are mutualistic because the shiner requires chub nests to spawn but the chub also benefits from additional shiner eggs by reducing predation risk on their own eggs (i.e., dilution effect). As proxies for reproductive success of bluehead chub, we studied factors affecting their nest size variation and utilization by yellowfin shiner in three streams in the upper Piedmont region of South Carolina, USA. A total of 92 nests (71 spawned and 21 abandoned) were located, and we recorded spawning activity, nest size, number and size of male bluehead chub, number of yellowfin shiner, and environmental variables for 89 consecutive days in 2016. Path analysis showed that larger males spawned earlier in the season than smaller males, and instances of pebble re-use for nest construction increased through the spawning season, which extended from April to June. Larger males more likely shared the same nest with each other than smaller males, and larger or more males constructed larger nests and attracted more yellowfin shiner. Nest size also increased when males re-used substrate materials from old nests, and nests built in this manner (36 nests) were equally prevalent as newly constructed nests (35 nests). This study suggests that complex mechanisms mediate host nest size and interactions with nest associates, and individual variation likely shapes dynamics of the mutualistic reproductive interaction.
机译：男性巢施工是鱼类的共同生殖策略，但对嵌套行为的特异性变异和与其他物种的繁殖相互作用几乎是知之甚少。在美国东南部，蓝头糖果（Nocomis Leptocephalus）和巢助理（如黄鳍脊柱（Notropis Lutipinnis）之间的生殖相互作用是相互主义的，因为鼻耳需要Chub Nests产卵，但Chub也通过降低捕食来从额外的闪电卵中受益对自己的鸡蛋（即稀释效果）的风险。作为Bluehead Chub的生殖成功的代理，我们研究了美国南卡罗来纳州南卡罗来纳州上部皮埃蒙特地区的黄鳍闪电界影响其巢大小变化和利用的因素。总共有92个巢（71个植物和21个被遗弃的），我们在2016年连续89天录制了雄性蓝头糖粉的产卵活动，巢尺寸，数量和尺寸，为89天为89天。路径分析显示较大的雄性在赛季早期产卵比较小的雄性，而野卵巢的鹅卵石建设实例通过产卵季节增加，从4月到6月延伸。比较小的雄性更大的男性更有可能与较小的雄性相同的巢，并且更大或更多的男性构建了较大的巢穴并吸引了更多的黄鳍闪丝。当男性从旧巢的衬底材料重用衬底材料和以这种方式建造的巢（36个巢穴）时，巢尺寸也会增加，并且正如新构造的巢穴（35个巢穴）一样普遍普遍。本研究表明，复杂的机制调解主机巢大小和与巢伙伴关系的交互，各个变化可能会形成互动生殖相互作用的动态。

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