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首页> 外文期刊>Marine ecology progress series >Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a 'thermophilic' cave-dwelling species benefiting from the warming of the NW Mediterranean
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Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a 'thermophilic' cave-dwelling species benefiting from the warming of the NW Mediterranean

机译：受益于西北地中海变暖的“嗜热性”洞穴栖居物种马尔氏疟原虫（甲壳纲：Mysidacea）的种群结构和生活史

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摘要

Dark submarine caves are an extreme and fragmented habitat in which mysids (Crustacea: Mysidacea) of the genus Hemimysis can be found. Hemimysis speluncola has long been the dominant mysid species of the NW Mediterranean caves, but with the recent warming of this region, its congener H. margalefi has replaced it. Nothing is known about the biology and ecology of H. margalefi and here, we provide the first information about its demographic structure and reproductive biology in a cave recently affected by the species shift. We conducted monthly sampling for 4 yr in the Jarre Island cave, near Marseilles (France), where a population of H. margalefi established itself in the late 1990s. Population dynamics were followed by monitoring length-frequency histograms and the influence of temperature on several life-history traits was investigated. H, margalefi reproduces all year round and the brood size depends on female size. Recruitment is discontinuous and occurs when post-nauplioid larvae are 1.3 to 2.0 mm long. Four annual and overlapping cohorts (about 6 mo long) underline more intensive periods of breeding. Females can produce up to 2 successive cohorts during their life. Whatever the maturity stage, females present larger sizes than males. Seasonal variations of water temperature have a strong influence on different life-history traits of H. margalefi, such as mean sizes of the different cohorts, length of intermoult stages and growth rate. Some population dynamics features of H. margalefi are a further indication that it is a species with an affinity for warm water, which has recently benefited from the warmer conditions in the NW Mediterranean, colonising new areas .and replacing its congener H. speluncola in most of its former range.
机译：黑暗的海底洞穴是一个极端且零散的栖息地，可以在其中发现半潜蝇属的mysids（甲壳纲：Mysidacea）。 Hemimysis speluncola长期以来一直是西北地中海洞穴的主要Mysid物种，但是随着该地区最近的变暖，其同类动物H. margalefi取代了它。关于H. margalefi的生物学和生态学还一无所知，在这里，我们提供有关其种群结构和最近在物种迁移影响下的洞穴中的生殖生物学的第一个信息。我们在法国（Marseilles）附近的Jarre岛洞穴中进行了为期4年的每月采样，该洞穴在1990年代末建立了H. margalefi种群。监测种群动态，然后监测长度-频率直方图，并研究温度对几种生活史特征的影响。 H，玛格丽菲终年繁殖，繁殖体的大小取决于雌性的大小。招募是不连续的，发生在无节幼体后幼虫长1.3至2.0 mm时。四个年度和重叠的队列（约6个月长）强调了更密集的繁殖期。女性一生最多可以产生2个连续队列。不论成熟阶段，雌性的体型均大于雄性。水温的季节性变化对玛格氏杆菌的不同生活史特征有很大的影响，例如不同人群的平均大小，成年期的长短和生长速度。玛格丽特氏菌的某些种群动态特征进一步表明，它是一种对温水具有亲和力的物种，最近该物种得益于西北地中海地区的变暖条件，在新地区定居并在大多数地区替代了同类物种斯佩伦科拉。以前的范围。

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