Dams effects on potamodromous Prochilodus magdalenae: evidence from endocrine response
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Abstract
Background. Prochilodus magdalenae is a neotropical fish that synchronizes reproduction with flood river pulses.
Methods. We used an endocrine method to test the influence of hydropeaking on hormone production related with reproduction. We analyzed P. magdalenae reproduction in individuals from two sectors of a Neotropical river basin: one with natural flow and the other with a regulated hydrological regime.
Results. In the section of the basin with natural flow we found that the production of hormones related with fish reproduction (FSH and LH) was correlated with the gonadosomatic index, while in fish experiencing hydropeaking due to hydroelectric operation no such correlation was detected.
Discussion. We conclude that potamodromous fish reproductive hormone production is sensitive to changes in water level/discharge, consequently, fish exposed to hydropeaking receive ambiguous stimuli that affect hormone production, reproduction synchronization with environmental cues, and ripening, which are essential for reproductive success.
Cite this as
2017. Dams effects on potamodromous Prochilodus magdalenae: evidence from endocrine response. PeerJ Preprints 5:e3490v1 https://doi.org/10.7287/peerj.preprints.3490v1Author comment
This is a submission to PeerJ for review.
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Competing Interests
The authors declare that they have no competing interest.
Author Contributions
Daniela De Fex-Wolf conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables.
Silvia López-Casas conceived and designed the experiments, performed the experiments, wrote the paper, reviewed drafts of the paper.
Luz Fernanda Jiménez-Segura conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.
Clara María Pérez-Gallego fieldwork infraestructure and transport support.
Animal Ethics
The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):
N/A
Data Deposition
The following information was supplied regarding data availability:
Figshare
Name: Data Prochilodus
Funding
This work was supported by ISAGEN S.A. E.S.P. (contract 46/3296). External funders financing field trips, congress participation, payment to students, fishermen and laboratory analysis, and have allowing the publication of this study
