Use of osmoregulatory ability to predict invasiveness of the Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) an invader in Southern Brazil

The Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) is native to the Indo-Pacific Ocean, and occurs as an invasive species along the Eastern American coast, where it was probably introduced in ballast water. The present study evaluated the osmoregulation and salinity tolerance...

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Published inNauplius Vol. 27; p. e2019014
Main Authors Occhi, Thiago Vinícius Trento, Vitule, Jean Ricardo Simões, Metri, Cassiana Baptista, Prodocimo, Viviane
Format Journal Article
LanguageEnglish
Published Cruz das Almas Sociedade Brasileira de Carcinologia 2019
Subjects
Ballast water
Biological invasion
Brackish
Brackishwater environment
Charybdis hellerii
Decapoda
Estuaries
Estuarine dynamics
Introduced species
Invasive species
Marine crustaceans
Moisture content
muscle water control
Osmoregulation
osmotic homeostasis
physiological traits
Salinity
Salinity tolerance
Tolerance
ZOOLOGY
Brazil, Parana, Paranagua Bay
muscle water control
Biological invasion
Decapoda
physiological traits
osmotic homeostasis
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Summary:The Indo-Pacific swimming crab Charybdis hellerii (A. Milne-Edwards, 1867) is native to the Indo-Pacific Ocean, and occurs as an invasive species along the Eastern American coast, where it was probably introduced in ballast water. The present study evaluated the osmoregulation and salinity tolerance of C. hellerii in Paranagua Bay, Parana, Brazil, an estuary under the constant threat of introduction of non-native species. The crabs were abruptly submitted to salinities of 10, 20, 30 (control), and 40 PSU for 24h. Hemolymph osmolality showed either an increase or a decrease following the changes in water salinity, presenting a pattern of hyper-osmoconformation. Muscle water content was stable at salinities from 20 to 40 PSU, and increased after exposure to 10 PSU indicating cellular swelling. At 10 PSU a physiological limit was reached, indicated by the failure of the capacity to regulate tissue water content. Although adult C. hellerii tolerate a wide range of salinities for 24 h, its osmoregulatory ability indicates a possible advantage for its establishment in estuarine waters with salinities <20 PSU. The salinity tolerance and osmoregulatory data are important basic information to be used in models to predict and prevent the invasion of the species into new areas of the Neotropics
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ISSN:2358-2936
0104-6497
2358-2936
DOI:10.1590/2358-2936e2019014