Reduction in reproductive activity from degeneration of testicular follicles in Megapitaria squalida (Mollusca: Bivalvia) exposed to metal pollution in the Gulf of California.

Autor: Yee-Duarte JA; Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas. Av. Instituto Politécnico Nacional, s/n Col. Playa Palo de Santa Rita. C.P. 23096, La Paz, Baja California Sur, Mexico; Departamento Académico de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, Carretera al Sur KM 5.5, C.P. 23080, La Paz, Baja California Sur, Mexico., Arellano-Martínez M; Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas. Av. Instituto Politécnico Nacional, s/n Col. Playa Palo de Santa Rita. C.P. 23096, La Paz, Baja California Sur, Mexico., Roldán-Wong NT; Department of Biology, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada., Kidd KA; Department of Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4K1, Canada., Ceballos-Vázquez BP; Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas. Av. Instituto Politécnico Nacional, s/n Col. Playa Palo de Santa Rita. C.P. 23096, La Paz, Baja California Sur, Mexico. Electronic address: bceballo@ipn.mx.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2024 Aug; Vol. 205, pp. 116648. Date of Electronic Publication: 2024 Jun 24.
DOI: 10.1016/j.marpolbul.2024.116648
Abstrakt: Over a reproductive cycle, the prevalence and intensity of degeneration of testicular follicles in Megapitaria squalida collected from the mining port of Santa Rosalia (a highly metal-polluted area), and San Lucas (a less polluted site), Gulf of California, Mexico, were evaluated. At San Lucas, most individuals had a typical testicular structure, and degeneration of testicular follicles was present in 9.5 % of spawning organisms. In contrast, at Santa Rosalia, 68 % of males, mainly in the ripe stage, had testicular degeneration (72 % severe intensity, mostly in medium and large-sized). Degeneration was characterized by intense hemocyte infiltration, identified as dense masses with numerous melanized cells in the follicle lumen. In both sites, males with testicular follicles degeneration had a lower condition index compared to males without degeneration. Degeneration of testicular follicles before spawning compromises and decreases the reproductive activity of M. squalida males at Santa Rosalia, which may ultimately affect the population sustainability.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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