Study of the reproductive strategy of crayfish species is of great importance in the current astacological world. Crayfish are among the largest freshwater invertebrates, and as keystone species, they are able to regulate the structure of the benthic fauna in the freshwaters, demonstrating different ecological strategies and life spans ranging up to 20 + years. In order to bring together the various pieces of information related to this issue, this overview of published scientific reports was conducted. The majority of crayfish species studied show sexual dimorphism, with approximately equal numbers of males and females. However, over some decades numerous observations have been made for a few species that may have different modes of reproduction, such as hermaphroditism or intersex ( e.g. Cherax quadricarinatus , Samastacus spinifrons, Parastacus virilastacus and Pacifastacus leniusculus ) and parthenogenesis (only Procambarus fallax f . virginalis ). A recent study showed a new case of parthenogenesis as apomictic parthenogenesis (only Orconectes limosus ). In addition, there are many investigations into the reproduction biology of crayfish, including using eyestalk ablation or androgenic gland ablation under various lab conditions and hybridization under natural conditions ( e.g. Astacus astacus X Astacus leptodactylus , Orconectes rusticus X Orconectes propinquus ). There are also some chemical factors which could possibly affect the reproduction system of crayfish in the wild.
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机译:研究小龙虾物种的繁殖策略在当前的占星术世界中具有重要意义。小龙虾是最大的淡水无脊椎动物之一,作为关键物种,它们能够调节淡水底栖动物的结构,展示了不同的生态策略和长达20年以上的寿命。为了汇集与该问题有关的各种信息,对已发表的科学报告进行了概述。研究的大多数小龙虾物种都表现出性二态性,其中雄性和雌性的数量大致相等。然而,几十年来,已经对一些可能具有不同繁殖方式的物种进行了许多观察,例如雌雄同体或雌雄同体(例如Cherax quadricarinatus,Samastacus spinifrons,Parastacus virilastacus和Pacifastacus leniusculus)和孤雌生殖(仅Procambarus fallax f。virginalis)。 )。最近的研究显示单性生殖的新情况是无融合生殖的单性生殖(仅Orconectes limosus)。此外,对小龙虾的繁殖生物学进行了许多研究,包括在各种实验室条件下使用眼柄消融或雄激素腺消融以及在自然条件下进行杂交(例如Astacus astacus X Astacus leptodactylus,Orconectesrustus X Orconectes propinquus)。还有一些化学因素可能会影响野生小龙虾的繁殖系统。
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