Evaluation of the reproductive parameters of female neotropical migratory fish from a lotic and lentic environment of a dammed river

IF 0.7 4区生物学 Q4 ZOOLOGY

Tropical Zoology Pub Date : 2021-01-01 DOI:10.4081/tz.2021.73

Luiza Mariz Amador De Souza, Gabriela Gonçalves Theobaldo, E. Rizzo, J. E. Dos Santos, N. Bazzoli, A. L. Paschoalini

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引用次数: 0

Abstract

The fragmentation of watercourses caused by dams is considered to be one of the main threats to aquatic biodiversity worldwide, especially for ichthyofauna. Several studies have shown that the environmental modifications caused by dammed water bodies can change the various reproductive parameters of freshwater fish. Therefore, the present study aims to comparatively analyze the reproductive potential of female Megaleporinus reinhardti, a migratory species, sampled in the lentic environment of the Três Marias Reservoir and the lotic environment of the São Francisco River. Biometric data were obtained from 79 females and the biological indices were subsequently calculated. Additionally, the microscopic analysis of the gonads was performed, and the follicular atresia index was compared. The results of the study show that fish from the lotic environment presented higher gonadal volume, fecundity, and oocyte diameter, and a lower follicular atresia index when compared to fish from the lentic environment. In summary, the data suggest that environmental changes, i.e. from a lotic to lentic environment, caused by river damming, may negatively affect the reproductive process of migratory fish, such as M. reinhardti, and impair the maintenance of the population of this species in lentic environments

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拦河坝生态环境中新热带洄游雌鱼生殖参数的评价

水坝造成的河道破碎被认为是全球水生生物多样性的主要威胁之一，特别是对鱼类动物。一些研究表明，筑坝水体引起的环境变化可以改变淡水鱼的各种繁殖参数。因此，本研究旨在比较分析在Três Marias水库的自然环境和 o Francisco河的自然环境中取样的洄游物种Megaleporinus reinhardti雌虫的生殖潜能。获得79只雌性的生物特征数据，并计算生物学指标。此外，还进行了性腺的显微镜分析，并比较了卵泡闭锁指数。研究结果表明，与生活在野外的鱼相比，生活在野外的鱼具有更高的性腺体积、繁殖力和卵母细胞直径，以及更低的卵泡闭锁指数。综上所述，这些数据表明，河流筑坝引起的环境变化，即从水生环境到水生环境，可能会对莱茵哈蒂等洄游鱼类的繁殖过程产生负面影响，并损害该物种在水生环境中的种群维持

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来源期刊

Tropical Zoology 生物-动物学

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Tropical Zoology is an international zoological journal publishing original papers in the field of systematics, biogeography, phylogeny, ecology and conservation of all terrestrial and aquatic animal Phyla from tropical and subtropical areas. Only papers with new information, high quality and broad interest are considered. Single species description and checklists are not normally accepted. Review papers are welcome. The journal is owned by the Istituto di Ricerca sugli Ecosistemi Terrestri of the Consiglio Nazionale delle Ricerche, Florence, Italy (CNR-IRET) who performs research into the structure and functioning of aquatic and terrestrial ecosystems, focusing in particular on anthropogenic pressure and global change. The knowledge amassed forms the scientific basis for identifying the most appropriate protective and corrective interventions, and provides support for the bodies entrusted with formulating policies for environmental protection and recovery.