Upwelling as a stressor event during embryonic development: Consequences for encapsulated and early juvenile stages of the marine gastropod Acanthina monodon.

Autor: Paredes-Molina FJ; Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile. Electronic address: paredesfco91@gmail.com., Chaparro OR; Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile., Navarro JM; Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile; Centro FONDAP de Investigación de Ecosistemas Marinos de Altas Latitudes (IDEAL), Universidad Austral de Chile, Valdivia, Chile., Cubillos VM; Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile., Paschke K; Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, Chile; Centro FONDAP de Investigación de Ecosistemas Marinos de Altas Latitudes (IDEAL), Universidad Austral de Chile, Valdivia, Chile; Millennium Institute Biodiversity of Antarctic and Subantarctic Ecosystems, BASE, Universidad Austral de Chile, Chile., Márquez F; Laboratorio de Reproducción y Biología Integrativa de Invertebrados Marinos (LARBIM)-IBIOMAR, CCT, CONICET-CENPAT, Puerto Madryn, Chubut, Argentina; Universidad Nacional de La Patagonia San Juan Bosco (UNPSJB), Puerto Madryn, Argentina., Averbuj A; Laboratorio de Reproducción y Biología Integrativa de Invertebrados Marinos (LARBIM)-IBIOMAR, CCT, CONICET-CENPAT, Puerto Madryn, Chubut, Argentina., Zabala MS; Laboratorio de Reproducción y Biología Integrativa de Invertebrados Marinos (LARBIM)-IBIOMAR, CCT, CONICET-CENPAT, Puerto Madryn, Chubut, Argentina., Bökenhans V; Laboratorio de Reproducción y Biología Integrativa de Invertebrados Marinos (LARBIM)-IBIOMAR, CCT, CONICET-CENPAT, Puerto Madryn, Chubut, Argentina., Pechenik JA; Biology Department, Tufts University, Medford, MA, 02155, USA.
Jazyk: angličtina
Zdroj: Marine environmental research [Mar Environ Res] 2024 Jan; Vol. 193, pp. 106270. Date of Electronic Publication: 2023 Nov 21.
DOI: 10.1016/j.marenvres.2023.106270
Abstrakt: Upwelling phenomena alter the physical and chemical parameters of the sea's subsurface waters, producing low levels of temperature, pH and dissolved oxygen, which can seriously impact the early developmental stages of marine organisms. To understand how upwelling can affect the encapsulated development of the gastropod Acanthina monodon, capsules containing embryos at different stages of development (initial, intermediate and advanced) were exposed to upwelling conditions (pH = 7.6; O 2  = 3 mg L -1 ; T° = 9 °C) for a period of 7 days. Effects of treatment were determined by estimating parameters such as time to hatching, number of hatchlings per capsule, percentage of individuals with incomplete development, and shell parameters such as shell shape and size, shell strength, and the percentage of the organic/inorganic content. We found no significant impacts on hatching time, number of hatchlings per capsule, or percentage of incomplete development in either the presence or absence of upwelling, regardless of developmental stage. On the other hand, latent effects on encapsulated stages of A. monodon were detected in embryos that had been exposed to upwelling stress in the initial embryonic stage. The juveniles from this treatment hatched at smaller sizes and with higher organic content in their shells, resulting in a higher resistance to cracking 30 days after hatching, due to greater elasticity. Geometric morphometric analysis showed that exposure to upwelling condition induced a change in the morphology of shell growth in all post-hatching juveniles (0-30 days), regardless of embryonic developmental stage at the time of exposure. Thus, more elongated shells (siphonal canal and posterior region) and more globular shells were observed in newly hatched juveniles that had been exposed to the upwelling condition. The neutral or even positive upwelling exposure results suggests that exposure to upwelling events during the encapsulated embryonic phase of A. monodon development might not have major impacts on the future juvenile stages. However, this should be taken with caution in consideration of the increased frequency and intensity of upwelling events predicted for the coming decades.
Competing Interests: Declaration of competing interest The authors declare that they have no conflicts of interest.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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