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Contrasting reproductive biology of two hydrothermal gastropods from the Mid-Atlantic Ridge: implications for resilience of vent communities
Marine Biology ( IF 2.4 ) Pub Date : 2020-07-04 , DOI: 10.1007/s00227-020-03721-x
J. Marticorena , M. Matabos , J. Sarrazin , E. Ramirez-Llodra

The recovery of populations and their ability to recolonise a disturbed habitat is mainly dependent on their reproductive biology (e.g., fecundity, frequency of reproduction, and time to maturity) and recruitment success. To assess recolonisation processes and connectivity of vent communities, and infer their resilience to natural and anthropogenic disturbances, we studied the life-history traits of two dominant species of vent gastropods from the northern Mid-Atlantic Ridge: Protolira valvatoides and Pseudorimula midatlantica . Gonad morphology, gametogenesis, and reproductive outputs related to shell length were described using histological analyses, and population structure was assessed from individuals’ size–frequency distributions. Samples were collected at different locations of the Montségur and Eiffel Tower edifices (Lucky Strike vent field) in April 2015, July 2017, and August 2018 to inform on spatial and temporal variations of their reproductive outputs and demography. All stages of oocyte development were found in the gonads of both species, suggesting a continuous gametogenesis and asynchronous reproduction. However, the two species showed contrasting reproductive strategies. Indeed, while P. midatlantica is gonochoric with a fecundity of up to 327 mature oocytes, P. valvatoides is hermaphrodite with an extremely low fecundity including a maximum of eight vitellogenic oocytes. Maximum oocyte size was 176 µm for P. midatlantica and 272 µm for P. valvatoides. We infer from previous knowledge and our results that both species exhibit a lecithotrophic development of larvae. There was no evidence of temporal variability of reproductive traits, but environmental conditions seem to affect gametogenetic maturity and oocyte size of P. midatlantica limpets. Variations in population structure at the edifice scale suggest habitat selection of individuals related to biotic and abiotic factors.

中文翻译:

大西洋中脊两种热液腹足动物的生殖生物学对比:对喷口群落恢复力的影响

种群的恢复及其重新定居受干扰栖息地的能力主要取决于它们的生殖生物学(例如,繁殖力、繁殖频率和成熟时间)和招募成功。为了评估喷口群落的重新定殖过程和连通性,并推断它们对自然和人为干扰的恢复能力,我们研究了大西洋中脊北部两种主要喷口腹足动物物种的生活史特征:Protolira valvatoides 和 Pseudorimula midatlantica。使用组织学分析描述了与壳长度相关的性腺形态、配子发生和生殖输出,并根据个体的大小 - 频率分布评估了种群结构。2015 年 4 月、2017 年 7 月和 2018 年 8 月在蒙特塞古尔和埃菲尔铁塔大厦(幸运罢工通风口场)的不同位置收集了样本,以了解其生殖输出和人口统计的时空变化。在这两个物种的性腺中都发现了卵母细胞发育的所有阶段,这表明连续的配子发生和异步繁殖。然而,这两个物种表现出截然不同的繁殖策略。事实上,虽然 P. midatlantica 是生殖器,具有多达 327 个成熟卵母细胞的繁殖力,但 P. valvatoides 是雌雄同体,繁殖力极低,包括最多 8 个生卵白卵母细胞。P. midatlantica 的最大卵母细胞大小为 176 µm,P. valvatoides 的最大卵母细胞大小为 272 µm。我们从先前的知识和我们的结果推断,这两个物种都表现出幼虫的卵磷脂发育。没有生殖性状随时间变化的证据,但环境条件似乎会影响 P. midatlantica 帽贝的配子成熟度和卵母细胞大小。建筑物规模人口结构的变化表明与生物和非生物因素相关的个体的栖息地选择。
更新日期:2020-07-04
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