Collado Gonzalo A, Chihuailaf Elizabeth, Muñoz-Herrera Natalia, Contreras Manuel, Novoa Fernando, Valladares Moisés A
Departamento de Ciencias Básicas, Facultad de Ciencias, Universidad del Bío-Bío, Chillán, Chile.
Centro de Ecología Aplicada, Santiago, Chile.
PeerJ. 2021 Aug 17;9:e11550. doi: 10.7717/peerj.11550. eCollection 2021.
Knowing the reproductive biology of threatened species is essential for conservation and to establish proper management plans. , a freshwater snail only known from two locations in the Atacama Saltpan, northern Chile, is currently classified as Data Deficient on the IUCN Red List and Critically Endangered by the Ministerio del Medio Ambiente of Chile. Based on size-frequency distribution, multivariate analysis of shell measurements, and microdissections, we studied the reproductive strategy, recruitment period, sex ratio and sexual dimorphism in this species. is an oviparous species, with direct development (non-planktotrophic). Females lay capsules of a single egg from which a juvenile resembling a miniature adult hatches after intracapsular metamorphosis is completed. The development type was confirmed by the observation of a paucispiral protoconch (= protoconch I) using scanning electron microscopy. Recruitment was observed across the four seasons of the year, with an increment at the end of austral summer. Results also showed that sex ratio was 1:1, whereas sexual dimorphism was not detected using univariate and multivariate analysis of the shell. The reproductive data provided in this study are a starting point for future management plans.
了解濒危物种的繁殖生物学对于保护以及制定恰当的管理计划至关重要。智利北部阿塔卡马盐沼仅在两个地点被发现的淡水蜗牛，目前在国际自然保护联盟红色名录中被列为数据缺乏，并且被智利环境部列为极度濒危物种。基于大小频率分布、贝壳测量的多变量分析以及显微解剖，我们研究了该物种的繁殖策略、补充时期、性别比例和两性异形。该物种为卵生，直接发育（非浮游性幼体发育）。雌性产下单个卵的卵囊，在卵囊内变态完成后，一个类似微型成体的幼体从卵囊中孵化出来。通过扫描电子显微镜观察到少旋原壳（=原壳I），从而证实了发育类型。全年四个季节均观察到补充现象，在南半球夏季末有所增加。结果还表明，性别比例为1:1，而在对贝壳进行单变量和多变量分析时未检测到两性异形。本研究中提供的繁殖数据是未来管理计划的起点。
