Elucidating divergent growth and climate vulnerability in abalone (Haliotis iris): A multi-year snapshot

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2025-03-16 DOI:10.1016/j.marenvres.2025.107090

Joanna S. Copedo , Stephen C. Webb , Lizenn Delisle , Ben Knight , Norman L.C. Ragg , Olivier Laroche , Leonie Venter , Andrea C. Alfaro

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Abstract

Many abalone populations worldwide are in decline as a result of changing climate and fishing pressure. In New Zealand (NZ) Haliotis iris is the largest and most abundant of the endemic abalone species. This species displays high levels of phenotypic variation with slow-growing populations having an impact on their commercial utilisation. The present study incorporates targeted histopathological approaches to characterise tissue-level factors in abalone from NZ's principal fishing region. Adult (n = 60) and sub-adult (n = 56) H. iris were collected from two Chatham Island sites that display differential growth rates; sampling was repeated on six occasions over three years. Through histology the slower-growing adult population was observed to have an elevated ceroid score, higher prevalence of kidney stones and increased prevalence of a plasmodia stage of haplosporidian-like parasites in the right kidney, when compared with the faster-growing and sub-adult populations. Furthermore, the faster-growing adult population appeared to be retaining mature oocytes over the predicted spawning season with higher-than-expected atresia (oocyte degeneration). Factors implicated in growth performance between the two populations include site, environment, parasites, pathology, reproduction, ceroid deposition and previously reported nutritional status. The 18S PCR and metabarcoding on the right kidney tissue were negative for haplosporidian/Urosporidium previously reported in H. iris, with metabarcoding results detecting an apicomplexan ancestral group. The reproductive, somatic and parasite findings from the current study provides critical information on abalone physiological condition which allows facilitation of early detection of conditions that may impact the sustainability and management of H. iris stocks in New Zealand under a changing climate. For instance, changes to reproductive condition may reduce oocyte quality and quantity thereby reducing recruitment to the next generation.

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.