Data/hora: 02/06/2024 02:24:06

Provedor de dados: | 74
País: | Brazil
Título: | Differential survivorship of congeneric ornamental fishes under forecasted climate changes are related to anaerobic potential
Autores: | Gonçalves,Luciana Mara Fé; Silva,Maria de Nazaré Paula da; Val,Adalberto Luis; Almeida-Val,Vera Maria Fonseca de.
Data: | 2018-03-01
Ano: | 2018
Palavras-chave: | Ornamental fish; Enzyme activity; Relative gene expression; IPCC scenarios; Lactate Dehydrogenase (Ldh).
Resumo: | Abstract Two Amazonian closely related tetras – cardinal Paracheirodon axelrodi and green neon P. simulans – were artificially acclimatized to environmental chambers mimicking future climate change scenarios (mild, moderate and extreme), using a microcosm facility. P. simulans survived (100%) to all scenarios after 30 days exposure, while P. axelrodi presented decreasing survival percentages according to environmental severity. These differences may be the reflection of distinct natural acclimatization to microhabitats between the species, which differ in thermal conditions. Survival responses might be related to differences in relative gene expression of lactate dehydrogenase (Ldh), suggesting that P. axelrodi anaerobic potential is lower or non-existent compared to P. simulans, not tolerating long-term thermal challenges. Accordingly, increases in temperature and in CO2 levels caused increases in energy demand and resulted in activation of the anaerobic pathway, as demonstrated by the higher enzyme levels measured in head and tail portions of both species. Sustained anaerobic glycolysis is possible when fish live in challenging environments (low oxygen or high temperature). Our results clearly show that P. simulans has a larger scope for survival to higher energy demands due to its increased anaerobic potential compared to P. axelrodi.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000100107
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/1678-4685-gmb-2017-0016
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.41 n.1 2018
Fonte: | info:eu-repo/semantics/openAccess