Many fish spawn in aggregations, but little is understood about the dynamics governing the success of spawning interactions. Here, we evaluate the influence that location of lek-like mating territories has on spawning interactions of Gomphosus varius. We used direct observations of spawning and egg predation events as well as local population counts to compare the rates of spawning, spawning interruptions, and predation on the eggs of G. varius at Finger Reef, Apra Harbor, Guam. We hypothesized that spawning rates would be highest among seaward locations that facilitate transport of pelagic larvae from reefs and that those territories would subsequently experience higher densities of egg predators, egg predation rates, and spawning interruptions. Male spawning success was highly skewed by mating territory location, with holders of the outer, seaward mating territories being more successful than those males holding territories in the middle and inner areas of the aggregation site. Within the outer territories, male mating success was also skewed by location. Egg predation was observed occasionally and increased linearly with bird wrasse spawning frequency. The population densities of egg predators were distributed equally across the study area. Spawning interruptions occurred most frequently within the inner zone of the spawning aggregation due to greater male-male aggression in intraspecific competition for females and territories. This study provides evidence that reef location influences the spawning success, egg predation rates, and spawning interruption rates of fishes that reproduce using lek-like mating territories.

许多鱼以聚集的形式产卵，但是对于控制产卵相互作用成功的动力学知之甚少。在这里，我们评估了韭菜状交配区域的位置对冈比亚变种产卵相互作用的影响。我们用产卵和卵捕食事件的直接观察，以及当地人口数比较产卵，产卵中断的发生率，并在卵捕食G. VARIUS在手指礁，阿普拉港，关岛。我们假设，在有利于从礁石中上浮幼体运输的沿海地区，产卵率最高，而这些地区随后将经历更高密度的蛋食掠食者，蛋捕食率和产卵中断。雄性产卵的成功因交配区域的位置而受到很大的歪曲，与之相比，外部，海域交配区域的拥有者要比在聚集地点的中部和内部区域拥有领土的那些雄性更为成功。在外围地区，雄性交配成功也因地点而异。偶尔观察到卵的捕食，并随着鸟濑鱼产卵频率的增加而线性增加。鸡蛋捕食者的种群密度在整个研究区域内平均分布。产卵中断最频繁发生在产卵聚集体的内部区域，这是由于雌性和地域种内竞争中的雄性-雄性侵略性更大。这项研究提供了证据，表明珊瑚礁的位置会影响使用类似韭菜的交配地区繁殖的鱼类的产卵成功率，卵的捕食率和产卵中断率。