Life History of the Endemic Saddleback Crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA

IF 0.8 Q4 MARINE & FRESHWATER BIOLOGY Freshwater Crayfish Pub Date : 2019-02-28 DOI:10.5869/FC.2019.V24-1.1
R. DiStefano, J. Westhoff, Christopher J. Rice, A. Rosenberger
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引用次数: 1

Abstract

The saddleback crayfish, Faxonius medius (Faxon, 1884), is endemic to a single drainage in eastern Missouri, USA, that is affected by heavy metals mining, and adjacent to a rapidly-expanding urban area. We studied populations of F. medius in two small streams for 18 months to describe the annual reproductive cycle and gather information about fecundity, sex ratio, size at maturity, and size-class structure. We also obtained information about the species’ density at supplemental sites. The species, though rare in a geographic context, is locally abundant; we captured a monthly average of more than 75 F. medius from each of the two study populations. Densities of F. medius were high relative to several sympatric species of Faxonius Cope, 1872 and Cambarus Erichson, 1846. The species exhibited traits of an r-strategist life history; it was relatively short-lived and early to maturity. Its fecundity and egg size were comparable to Ozark congeners. Breeding season occurred in autumn, perhaps extending into early winter. Egg brooding occurred primarily in April. Young-of-year first appeared in samples in June. We estimated that these populations contained 2 to 3 size-classes, and most individuals became sexually mature in their first year of life. Life history information presented herein will be important for future conservation efforts.
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美国密苏里州特有的鞍背小龙虾Faxonius medius (Faxon, 1884),(十足目:驼背科)的生活史
马背小龙虾Faxonius medius (Faxon, 1884)是美国密苏里州东部单一排水系统的特有物种,该排水系统受到重金属开采的影响,毗邻快速扩张的城区。我们对两个小河流中的中黄粉虱种群进行了为期18个月的研究,以描述其每年的繁殖周期,并收集了有关繁殖力、性别比例、成熟时大小和大小级结构的信息。我们还获得了补充点的物种密度信息。该物种虽然在地理环境中很罕见,但在当地却很丰富;我们每月平均从两个研究种群中捕获75个以上的f培养基。相对于Faxonius Cope(1872年)和Cambarus Erichson(1846年)的几个同地种,F. medius的密度较高。该物种表现出r-战略型生活史的特征;这段时间相对较短,成熟期较早。它的繁殖力和卵的大小与奥扎克的同类相当。繁殖季节发生在秋季,可能会延续到初冬。卵的孵化主要发生在四月。Young-of-year首次出现在6月份的样本中。我们估计这些种群包含2到3个大小等级,大多数个体在它们生命的第一年就性成熟了。本文提供的生活史信息将对未来的保护工作具有重要意义。
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Freshwater Crayfish
Freshwater Crayfish MARINE & FRESHWATER BIOLOGY-
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2.70
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