Hormones, parasites and male mating tactics in Alpine chamois: identifying the mechanisms of life history trade-offs
Hormones, parasites and male mating tactics in Alpine chamois: identifying the mechanisms of life history trade-offs
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DOI：
10.1016/j.anbehav.2012.08.005
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发表时间：
2012-10-01
期刊：
影响因子：
2.5
通讯作者：
Lovari, Sandro
中科院分区：
文献类型：
--
作者：
Corlatti, Luca;Bethaz, Stephanie;Lovari, Sandro
替代交配策略（AMTs）可能会显示当前繁殖和生存之间的不同权衡;然而，这种模式的近端机制仍不清楚。其中，生殖努力与激素分泌介导的寄生虫抗性之间的关系日益受到关注。我们监测了19个显着的成年雄性羚羊，Rupicapra rupicapra，在大天堂国家公园（意大利）之间的前和postrut 2011年，调查交配努力和寄生虫与AMT之间的权衡，以及潜在的生理机制。领土的男性急剧增加交配的努力，粪便雄激素和皮质醇代谢产物，和寄生虫水平在发情期，而nonterritorial的表现出类似的模式，只有雄激素代谢产物的水平。在车辙，领土男性投资更多的车辙活动，同时有更高水平的激素代谢产物和更大的粪便计数的寄生虫比nonterritorial男性。之前和之后的车辙，男性类型（领土和nonterritorial男性）之间的差异较小。我们的分析表明，交配努力和寄生之间的权衡存在，这种模式的基本机制可能是在雄激素代谢产物的分泌。领域男性在发情活动中的投资更大，这表明潜在的高交配收益。然而，交配的好处可能会被更大的受伤风险、脂肪储备的消耗和更高的激素水平所抵消，这可能有利于抑制免疫防御和随后降低寄生虫的抵抗力。(C)2012年，动物行为研究协会。由爱思唯尔有限公司出版。保留所有权利。
Alternative mating tactics (AMTs) may show different trade-offs between current reproduction and survival; however, the proximate mechanisms underlying this pattern remain unclear. Among them, the relationship between reproductive effort and parasite resistance mediated by hormonal secretion has received increasing attention. We monitored 19 marked adult male chamois, Rupicapra rupicapra, within the Gran Paradiso National Park (Italy) between the pre- and postrut 2011, to investigate the trade-off between mating effort and parasites associated with AMTs, and the underlying physiological mechanism. Territorial males sharply increased mating effort, faecal androgen and cortisol metabolites, and parasite levels during the rut, whereas nonterritorial ones displayed a similar pattern only for androgen metabolite levels. During the rut, territorial males invested more in rutting activities, while having higher levels of hormone metabolites and greater faecal counts of parasites than nonterritorial males. Before and after the rut, differences between male types (territorial and nonterritorial males) were smaller. Our analysis suggests that a trade-off between mating effort and parasitism exists, and that the proximate mechanism underlying this pattern may be found in the secretion of androgen metabolites. The greater investment in rutting activities, which territorial males make, suggests potentially high mating benefits. However, mating benefits could be counterbalanced by greater risk of injuries, consumption of fat reserves and higher hormone levels, which might favour the suppression of immunological defence and the subsequent decrease in parasite resistance. (C) 2012 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.