Zoological Studies

Vol. 63, 2024

(update: 2024.1.21)

Lethal Consequences and Embryo Shell Shape Alterations in the Marine Gastropod Trophon geversianus Due to Elevated Temperatures

Rocío Aimé Nieto Vilela1,2,3,*, Sebastián Giulianelli3, Soledad Zabala3, Gregorio Bigatti3,4,5, and Federico Márquez3,4

1CIBIO, Research Centre in Biodiversity and Genetic Resources - InBIO Associate Laboratory, Campus of Vairão, University of Porto, Vairão, Portugal- BIOPOLIS Program in Genomics, Biodiversity and Land Planning. *Correspondence: rocionietovilela@gmail.com (Nieto Vilela)
2CIT Río Negro (CONICET). Centro de investigaciones y transferencia de Río Negro. Rotonda cooperación y ruta provincial n°1. Cp. 8500. Viedma, Río Negro, Argentina.
3LARBIM- IBIOMAR (CONICET), Instituto de Biología de Organismos Marinos, Blvd. Brown 2915, Puerto Madryn, Chubut, Argentina. E-mail: giulianelli@cenpat-conicet.gob.ar (Giulianelli); zabala@cenpat-conicet.gob.ar (Zabala); gbigatti@cenpat-conicet.gob.ar (Bigatti); fede@cenpat-conicet.gob.ar (Marquez)
4UNPSJB, Universidad Nacional de la Patagonia San Juan Bosco, Blvd. Brown 3100, Puerto Madryn, Chubut, Argentina
5Universidad Espíritu Santo, Ecuador

(Received 7 July 2023 / Accepted 27 December 2023 / Published -- 2024)
Communicated by Ka Hou Chu

Environmental temperature is increasing while natural populations are forced to develop their life cycle under new conditions, resulting in the expression of new phenotypic traits. Still, the links between these new environmental conditions and the subsequent phenotypic expressions are not fully explored. Here, we conducted manipulative experiments with the marine gastropod Trophon geversianus embryos to assess the effects of warmer temperatures in shell form. We observed lethal effects together with alterations in the shell form (size + shape) of embryos exposed to 18°C compared to the control temperature (13°C). Our results reveal that T. geversianus from Patagonian coasts growing under warm temperatures will change their phenotype by selecting smaller and more elongated shells in the ontogeny, as well as an expansion of the shell aperture, increasing their predation vulnerability. Therefore, we considered that the embryonic shell shape change could be a good biomarker of thermal stress produced at early developmental stages in marine gastropods.

Key words: Direct development, Atlantic Patagonia, 2D geometric morphometrics, Early development stages, Thermal stress

Citation: Nieto Vilela RA, Giulianelli S, Zabala S, Bigatti G, Márquez F. 2024. Lethal consequences and embryo shell shape alterations in the marine gastropod Trophon geversianus due to elevated temperatures. Zool Stud 63:08.

Supplementary materials: Supplementary data 1