A comparative analysis of canyon and non-canyon populations of the deep-sea scavenging amphipod Paralicella caperesca
A comparative analysis of canyon and non-canyon populations of the deep-sea scavenging amphipod Paralicella caperesca
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DOI：
10.1017/s0025315415002064
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发表时间：
2016-12-01
影响因子：
1.2
通讯作者：
Horton, Tammy
中科院分区：
文献类型：
--
作者：
Duffy, Grant A.;Gutteridge, Zoe R. S.;Horton, Tammy
现有的深海片足类种群研究主要集中在栖息于深海喷口或海沟环境的物种上，但对世界性物种的研究很少。在这里，我们提供了新的见解的生活史和种群生态学的泛海洋清除片足类Parabellacaperesca和讨论的营养丰富的海底峡谷环境的影响，这个物种的生长和繁殖。通过解剖和测量从东北大西洋深海平原、大陆坡和海底峡谷采集的14个样本中的2997只P.caperesca，收集了数据。性二型不太明显，比观察到的其他清除端足类物种，但女性显着更大，比男性有较短的触角。雌体的卵母细胞大小在大小级间差异较大，卵巢中含有较多的卵母细胞，没有观察到空卵巢。这些因素，结合缺乏成熟的女性，表明P. caperesca的做法semelparity，繁殖策略，补充了这种专性necrophage的喂养策略。确定了5个雄性和7个雌性Caperesca的大小分组队列。深海海底峡谷人群的队列显示出一贯较大的平均总身体长度比非峡谷队列。个体从峡谷样本也表示性特征在较小的尺寸比非峡谷个人。我们推测，这些趋势是指示营养介导的生长，成熟，并在P. caperesca的繁殖。该物种是能够增长和繁殖相对较快，在响应增加营养输入峡谷环境，因此占主导地位的清除片足类组合。
Existing population studies of deep-sea amphipods have focused on species that inhabit deep-sea vent or trench environments but few cosmopolitan species have been studied. Here we provide new insight into the life history and population ecology of the pan-oceanic scavenging amphipod Paralicella caperesca and discuss the influence of nutrient-rich submarine canyon environments on the growth and reproduction of this species. Data were collected through the dissection and measurement of 2997 P. caperesca from 14 samples taken from abyssal plains, continental slopes and submarine canyons in the North-East Atlantic. Sexual dimorphism was less pronounced than observed for other scavenging amphipod species but females were significantly larger and had shorter antennae than males. The size of oostegites in female P. caperesca varied considerably within size classes, ovaries contained a relatively large number of oocytes, and no empty ovaries were observed. These factors, in combination with absence of mature females, suggest that P. caperesca practices semelparity, a reproductive strategy that complements the feeding strategy of this obligate necrophage. Five male and seven female size-grouped cohorts were identified for P. caperesca. Cohorts from deep-sea submarine canyon populations showed consistently larger mean total body lengths than non-canyon cohorts. Individuals from canyon samples also expressed sexual characteristics at smaller sizes than non-canyon individuals. We hypothesize that these trends are indicative of nutrient-mediated growth, maturation, and reproduction in P. caperesca. The species is able to grow and reproduce relatively quickly in response to increased nutrient input in canyon environments and therefore dominates scavenging amphipod assemblages.