Histopathological Changes in the Greenshell Mussel, Perna canaliculus, in Response to Chronic Thermal Stress

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aut.filerelease.date2023-09-01
aut.relation.articlenumber103699
aut.relation.journalJournal of Thermal Biology
aut.relation.startpage103699
aut.relation.volume117
dc.contributor.authorCopedo, Joanna S
dc.contributor.authorWebb, Stephen C
dc.contributor.authorRagg, Norman LC
dc.contributor.authorEricson, Jessica A
dc.contributor.authorVenter, Leonie
dc.contributor.authorSchmidt, Alfonso J
dc.contributor.authorDelorme, Natalí J
dc.contributor.authorAlfaro, Andrea C
dc.date.accessioned2023-10-12T21:30:46Z
dc.date.available2023-10-12T21:30:46Z
dc.date.issued2023-09-01
dc.description.abstractClimate change associated temperature challenges pose a serious threat to the marine environment. Elevations in average sea surface temperatures are occurring and increasing frequency of marine heatwaves resulting in mortalities of organisms are being reported. In recent years, marine farmers have reported summer mass mortality events of the New Zealand Greenshell mussel, Perna canaliculus, during the summer months; however, the etiological agents have yet to be determined. To elucidate the role of thermal stress, adult P. canaliculus were exposed to three chronic temperature treatments: a benign control of 17 °C and stressful elevations of 21 °C and 24 °C. Eight mussels per treatment were collected each month throughout a 14-month challenge period to identify and investigate histopathological differences among P. canaliculus populations exposed to the three temperatures. Histopathology revealed several significant deleterious alterations to tissues associated with temperature and exposure time. Increasing temperature and progression of time resulted in 1) an increase in the number of focal lipofuscin-ceroid aggregations, 2) an increase in focal hemocytosis, 3) an increase in the thickness of the sub-epithelial layer of the intestinal tract and 4) a decreased energy reserve cell (glycogen) coverage in the mantle. Prolonged exposure, irrespective of temperature, impacted gametogenesis, which was effectively arrested. Furthermore, increased levels of the heat shock protein 70 kDa (HSP 70) were seen in gill and gonad from thermally challenged mussels. The occurrence of the parasite Perkinsus olseni at month 5 in the 24 °C treatment, and month 7 at 21 °C was unexpected and may have exacerbated the fore-mentioned tissue conditions. Prolonged exposure to stable thermal conditions therefore appears to impact P. canaliculus, tissues with implications for broodstock captivity. Mussels experiencing elevated, temperatures of 21 and 24 °C demonstrated more rapid pathological signs. This research provides further insight into the complex host-pathogen-environment interactions for P. canaliculus in response to prolonged elevated temperature.
dc.identifier.citationJournal of Thermal Biology, ISSN: 0306-4565 (Print); 0306-4565 (Online), Elsevier, 117, 103699-. doi: 10.1016/j.jtherbio.2023.103699
dc.identifier.doi10.1016/j.jtherbio.2023.103699
dc.identifier.issn0306-4565
dc.identifier.issn0306-4565
dc.identifier.urihttp://hdl.handle.net/10292/16766
dc.languageeng
dc.publisherElsevier
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0306456523002401
dc.rightsCopyright © 2023 Elsevier Ltd. All rights reserved. This is the author’s version of a work that was accepted for publication in (see Citation). Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The definitive version was published in (see Citation). The original publication is available at (see Publisher's Version).
dc.rights.accessrightsOpenAccess
dc.subjectAtresia
dc.subjectEnvironmental stress
dc.subjectGametogenesis
dc.subjectGreenshell mussel
dc.subjectHistopathology
dc.subjectPerkinsus olseni
dc.subjectAtresia
dc.subjectEnvironmental stress
dc.subjectGametogenesis
dc.subjectGreenshell mussel
dc.subjectHistopathology
dc.subjectPerkinsus olseni
dc.subject3109 Zoology
dc.subject31 Biological Sciences
dc.subject2 Aetiology
dc.subject2.1 Biological and endogenous factors
dc.subject14 Life Below Water
dc.subject06 Biological Sciences
dc.subjectPhysiology
dc.subject3109 Zoology
dc.titleHistopathological Changes in the Greenshell Mussel, Perna canaliculus, in Response to Chronic Thermal Stress
dc.typeJournal Article
pubs.elements-id523509
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