Uncertainty in territory quality affects the benefits of usurpation in a Mediterranean wrasse
Uncertainty in territory quality affects the benefits of usurpation in a Mediterranean wrasse
复制标题
DOI：
10.1093/beheco/arh007
复制
发表时间：
2004-03-01
影响因子：
2.4
通讯作者：
Alonzo, SH
中科院分区：
文献类型：
--
作者：
Alonzo, SH
当领土的预期收益超过防御成本时，个人应该保卫遗址。然而，如果领土质量不可预测或难以评估，那么预期的领土行为模式就不那么明确了。在地中海乌贼中，交配的成功率是不同的，2%的筑巢公鱼获得了超过20%的产卵成功率。然而，交配成功率的差异并不能用雄性或其领地的任何已知身体特征来解释。相反，雌性更喜欢有近期交配成功历史的巢，因为雄性不太可能抛弃她留下的后代。因此，领土质量是暂时的，由两性之间的互动决定。我测量了领土接管的频率，以及在巢中度过的几天里交配成功的不确定性。观察表明，当雄性不成功并且体型比成功的邻居大时，雄性就会篡夺邻居成功的巢。交配成功的站点在连续几天内保持成功的概率(0.84)显著高于不成功的区域(0.30)。不成功的雄性如果篡夺了成功的邻居的领地，他们会获得更高和更确定的健康回报。两性内部和两性之间的相互作用导致了成功的不确定性，这影响了该物种的领地行为。
Individuals should defend sites when the expected benefits of the territory exceed the cost of defense. However, if territory qulaity is unpredictable or difficult to assess, the expected pattern of territorial behavior is less clear. In a Mediterranean wrasse, Symphodus ocellatus, mating success is skewed with 2% of nesting males getting more than 20% of the spawning success. Yet, variation in mating success is not explained by any known physical characteristic of males or their territories. Instead, females prefer nests with a recent history of mating success because males are less likely to desert the offspring she leaves behind. Thus, territory quality is transient and determined by interactions between the sexes. I measured the frequency of territorial takeovers and the uncertainty in mating success among days at a nest. Observations indicated that S. ocellatus males usurped their neighbor's successful nests when males were unsuccessful and larger than their successful neighbor. Sites that achieved mating success had a significantly higher probability (0.84) of remaining sucessful between consecutive days than unsuccessful territories had of becoming successful (0.30). Unsuccessful males obtained higher and more certain fitness returns if they usurped a successful neighbor's territory. Interactions within and between the sexes drive uncertainty in success, which influences territorial behavior in this species.