The energetic costs of alternative male reproductive strategies in Xiphophorus nigrensis
The energetic costs of alternative male reproductive strategies in Xiphophorus nigrensis
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DOI：
10.1007/s00359-009-0469-9
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发表时间：
2009-10-01
影响因子：
2.1
通讯作者：
Gelineau-Kattner, Rose
中科院分区：
文献类型：
--
作者：
Cummings, Molly Elizabeth;Gelineau-Kattner, Rose
不同雄性交配策略的共存取决于成本和收益之间的平衡。在这里，我们研究了短期代谢成本与不同的生殖策略，在遗传决定的替代男性表型的北方剑尾鱼，剑尾鱼。在这个物种中，大型男性法院女性，非装饰小男性追逐女性，和中间男性表现出求爱和追逐行为。使用间歇流量呼吸测定法，我们测量耗氧率和行为的每一个大小类在隔离和存在的女性。在单独和女性存在试验之间的耗氧量变化（Delta VO（2））与所有大小类别的标准长度显著相关（r = 0.42）。只有大的男性类表现出显着增加的耗氧量在女性本试验中表现出的范围从2到200%的增加相对于单独的代谢率，但具体的求爱显示的成本无法证明。剑的长度解释了54-57%的变化，耗氧量在大型男性单独试验和63-65%，在女性目前的试验独立的任何行为相关性与剑的长度。我们的研究结果表现出相似的条件依赖性的替代交配系统，女性青睐的表型有较高的能量成本。
The coexistence of alternative male mating strategies depends on the balance between costs and benefits. Here we examine the short-term metabolic costs associated with distinct reproductive strategies in the genetically determined alternative male phenotypes of a northern swordtail, Xiphophorus nigrensis. In this species, large males court females, non-adorned small males chase females, and intermediate males exhibit both courtship and chase behaviors. Using intermittent flow respirometry, we measure oxygen consumption rates and behaviors of each size class in isolation and in the presence of a female. Changes in oxygen consumption between solitary and female presence trials (Delta VO(2)) correlated significantly with standard length across all size classes (r = 0.42). Only the large male class exhibited a significant increase in oxygen consumption in female-present trials exhibiting a range of increase from 2 to 200% relative to solitary metabolic rates, but costs of specific courtship displays could not be demonstrated. Sword length explained 54-57% of the variation in oxygen consumption in large male solitary trials and 63-65% in the female-present trials independent of any behavioral correlation with sword length. Our results exhibit similarities to condition-dependent alternative mating systems where the female-favored phenotype has higher energetic costs.