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Directional orientation of migration in an aseasonal explosive-breeding toad from Brazil

Published online by Cambridge University Press:  28 May 2010

Raquel Rocha Santos ,
Simone Baratto Leonardi ,
Valentina Zaffaroni Caorsi  and
Taran Grant
Raquel Rocha Santos
Affiliation:
Laboratório de Sistemática de Vertebrados, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Faculdade de Biociências, Avenida Ipiranga 6681, 90619-900 Porto Alegre, RS, Brazil
Simone Baratto Leonardi
Affiliation:
Laboratório de Sistemática de Vertebrados, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Faculdade de Biociências, Avenida Ipiranga 6681, 90619-900 Porto Alegre, RS, Brazil
Valentina Zaffaroni Caorsi
Affiliation:
Laboratório de Sistemática de Vertebrados, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Faculdade de Biociências, Avenida Ipiranga 6681, 90619-900 Porto Alegre, RS, Brazil
Taran Grant*
Affiliation:
Laboratório de Sistemática de Vertebrados, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Faculdade de Biociências, Avenida Ipiranga 6681, 90619-900 Porto Alegre, RS, Brazil
*
1Corresponding author. Email: taran.grant@pucrs.br
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Abstract:

The directional orientation of pre- and post-reproductive migration was studied in the Brazilian red-bellied toad Melanophryniscus cambaraensis, a species that forms explosive-breeding aggregations at irregular intervals throughout the entire year. Migrating toads were captured by enclosing the breeding site in dual drift fences with inward- and outward-facing funnel traps. Data were collected over 5 mo and totalled 333 captures. The observed directional orientation was significantly different from expected under a uniform distribution for both pre- and post-reproductive migration, regardless of gender. Males and females did not differ significantly from each other in the orientation of entry or exit, and the directional orientation of pre-reproductive migration was not significantly different from post-reproductive migration. It is suggested that the observed directional bias may be due to a dirt road next to the breeding site that could restrict juvenile dispersal to the adjacent forest.

Keywords

AmphibiaAnuraBufonidaeecologyMelanophryniscus cambaraensismovementSouth America
Type
Research Article
Information
Journal of Tropical Ecology , Volume 26 , Issue 4 , July 2010 , pp. 415 - 421
Copyright
Copyright © Cambridge University Press 2010

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