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Emersion behavior of the semi-terrestrial crab Neohelice granulata during hypoxic conditions: Lactate as a trigger.

Authors
  • de Lima, Tábata Martins1
  • de Ramos, Bruna2
  • de Souza Tavares, Margarita3
  • Leidens, Danusa4
  • Ayres, Bruna Soares4
  • Maciel, Fábio Everton4
  • Nery, Luiz Eduardo Maia4
  • 1 Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, FURG, Av. Itália, Km 8, Rio Grande, RS 96201-300, Brazil. Electronic address: [email protected] , (Brazil)
  • 2 Programa de Pós-Graduação em Gerenciamento Costeiro, Instituto de Oceanografia, Universidade Federal do Rio Grande, FURG, Av. Itália, Km 8, Rio Grande, RS 96201-300, Brazil. , (Brazil)
  • 3 Instituto de Oceanografia, Universidade Federal do Rio Grande, FURG, Av. Itália, Km 8, Rio Grande, RS 96201-300, Brazil. , (Brazil)
  • 4 Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, FURG, Av. Itália, Km 8, Rio Grande, RS 96201-300, Brazil. , (Brazil)
Type
Published Article
Journal
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
Publication Date
Feb 01, 2021
Volume
252
Pages
110835–110835
Identifiers
DOI: 10.1016/j.cbpa.2020.110835
PMID: 33144155
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Climate changes affecting aquatic environments are increasing, and the resultant environmental challenges require animals to adopt alternative compensatory behavioral and physiological strategies. In particular, low levels of dissolved O2 are a regular problem for estuarine animals, leading to activation of a series of behavioral and physiological responses. This study on the semi-terrestrial crab Neohelice granulata examined patterns of emersion behavior under different levels of dissolved O2 availability and the role of lactate in this behavior. Emersion behavior was recorded for 4.5 h for crabs in water at four different levels of dissolved O2 (6, 3, 2, and 1 mg O2/L) and with free access to air. Oxygen consumption and hemolymphatic lactate levels were measured using the same experimental design. Emersion behavior was also recorded for 70 min in normoxic water after lactate or saline injections. Crabs increased their emersion behavior only in severe hypoxia (1 mg O2/L), and O2 consumption decreased under more severe hypoxic conditions. Despite the increase in emersion behavior, which leads to higher O2 availability, an increase in hemolymphatic lactate levels indicates that the animals still need to resort to anaerobic pathways to fulfill their metabolic demand. Furthermore, animals injected with lactate showed higher emersion behaviors than animals injected with a saline solution even in normoxia. These results suggest that the increase in hemolymphatic lactate can act directly or indirectly as a trigger for the increase in emersion behavior in the semi-terrestrial crab N. granulata. Copyright © 2020 Elsevier Inc. All rights reserved.

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