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More common than reported: range extension, size–frequency and sex-ratio of Uca (Minuca) victoriana (Crustacea: Ocypodidae) in tropical mangroves, Brazil

Published online by Cambridge University Press:  17 September 2010

Daniela da Silva Castiglioni ,
Alexandre Oliveira Almeida  and
Luis Ernesto Arruda Bezerra
Daniela da Silva Castiglioni
Affiliation:
Universidade Federal de Pernambuco, Centro Acadêmico de Vitória, Núcleo de Biologia, Rua Alto do Reservatório, s/n, Bairro Bela Vista, CEP 55608-680, Vitória de Santo Antão, Pernambuco, Brazil
Alexandre Oliveira Almeida
Affiliation:
Universidade Estadual de Santa Cruz, Departamento de Ciências Biológicas, Rodovia Ilhéus-Itabuna, km 16, CEP 45662-900 Ilhéus, Bahia, Brazil
Luis Ernesto Arruda Bezerra*
Affiliation:
Universidade Federal de Pernambuco, Departamento de Oceanografia, Programa de Pós-Graduação em Oceanografia, Avenida Arquitetura, s/n, Cidade Universitária, 50670-901, Recife, Pernambuco, Brazil
*
Correspondence should be addressed to: L.E.A. Bezerra, Universidade Federal de Pernambuco, Departamento de Oceanografia, Programa de Pós-Graduação em Oceanografia, Avenida Arquitetura, s/n, Cidade Universitária, 50670-901 Recife, Pernambuco, Brazil email: luiseab@gmail.com
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Abstract

The fiddler crab Uca (Minuca) victoriana von Hagen, 1987 has been reported, until recently, only from the type locality at Vitória, State of Espírito Santo, Brazil. We report here, for the first time, the occurrence of U. (M.) victoriana in estuaries of the States of Bahia and Pernambuco, north-eastern Brazil, extending its distribution; as well as some aspects of its population biology. For the population study, four sites were defined in mangroves of the Mamucabas and Ariquindá Rivers, Pernambuco, on different types of substrate, and sampled monthly during spring low tide from April 2008 through to March 2009. A total of 41 specimens were obtained in June 2008 in the Arinquindá River, of which 25 were males, 16 non-ovigerous females and 1 ovigerous female. In the Mamucabas River, 772 crabs were collected over the year, including 472 males, 300 non-ovigerous females and 2 ovigerous females. In both areas, the U. (M.) victoriana population showed a unimodal size–frequency distribution, with males and females (ovigerous and non-ovigerous) similar in size (7.46 ± 1.60 mm for males and 7.09 ± 1.45 mm for females; t = −0.744; P > 0.05). The overall sex-ratio (1:1.57) differed significantly from the expected 1:1 proportion1 (χ2 = 38.32; P < 0.05). Study of material deposited in Brazilian carcinological collections revealed several misidentified specimens, especially as U. (M.) rapax and U. (M.) burgersi. Some morphological characters to distinguish among these species are presented.

Keywords

Uca (Minuca) victorianapopulation biologysex-ratiofirst recordnorth-eastern Brazilmorphological characters
Type
Research Article
Information
Marine Biodiversity Records , Volume 3 , June 2010 , e94
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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