Intra-group home ranges in a female-biased group of sex-changing fish |
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| Affiliation: | 1. Centro de Investigación Científica y de Transferencia Tecnológica a la Producción – CICYTTP/CONICET/Prov. ER/UADER, España 149, Diamante, Entre Ríos E3105BWA, Argentina;2. Proyecto Yacaré, Laboratorio de Zoología Aplicada: Anexo Vertebrados, FHUC/UNL, Aristóbulo del Valle 8700, Santa Fe, Santa Fe 3000, Argentina;3. Facultad de Ciencia y Tecnología, UADER, Sede Diamante, Tratado del Pilar 314, Diamante, Entre Ríos E3105BWA, Argentina;4. Facultad de Humanidades y Ciencias, UNL, Ciudad Universitaria, Paraje El Pozo, Santa Fe 3000, Argentina;1. Department of Wildlife Ecology and Conservation, University of Florida, Gainesville, FL 32611, United States;2. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27607, United States;3. Florida Fish and Wildlife Conservation Commission, Fish and Wildlife Research Institute, Gainesville, FL 32601, United States;4. New York State Department of Environmental Conservation, Albany, NY 12233, United States;1. Universidade Estadual do Paraná (UNESPAR), Campus de União da Vitória, PR, Brazil;2. Departamento de Ecologia, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brazil;3. Programa de Pós-Graduação em Ciências Ambientais, Laboratório de Mastozoologia, Universidade do Estado de Mato Grosso, Cáceres, MT, Brazil;1. Consejo Nacional de Investigaciones Científicas y Técnicas, Leguizamón 366, A4400 Salta, Argentina;2. Jaguares en el Límite, León Gieco 125, 4401, Vaqueros, Salta, Argentina;3. Administración de Parques Nacionales, Delegación Regional Noroeste, Santa Fe 23, 4400, Salta, Argentina;4. Instituto de Ecorregiones Andinas y Centro de Estudios Territoriales Ambientales y Sociales. Alberdi 47, 4600, San Salvador de Jujuy, Argentina;5. Fundación Biodiversidad Argentina, Suipacha 1311 – 5 Piso - C1011AAC C. Autónoma de Buenos Aires, Argentina;6. Secretaría de Ambiente y Desarrollo Sustentable de Salta, Santiago del Estero 2246, Edificio B, 4400, Salta, Argentina;7. Instituto de Biología Subtropical, UNAM, CONICET, Bertoni 85, 3370, Puerto Iguazú, Misiones, Argentina;8. Wildlife Conservation Research Unit, Department of Biology, University of Oxford, Tubney OX13 5QL, UK |
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| Abstract: | Simultaneous loss of multiple males from large, multi-male social groups of the coral reef fish, Anthias squamipinnis, induces an equivalent number of females to change sex. One-to-one replacement could be produced in large groups if the group was organized according to either of two hypotheses. The group could consist of an aggregation of single-male, multi-female units with the home ranges of particular females falling within the home ranges of each male, and with sex change controlled separately within each unit. Alternatively, females might range freely throughout the group, with sex change controlled by differential interaction rates among males and females. In the latter case, female home ranges would overlap substantially with the home ranges of several males. To choose between these hypotheses, the three-dimensional, intra-group home ranges of five males and five adult females were measured in a group containing five males and 32 adult females. All 10 fish had definable home ranges. Home ranges of females were larger than home ranges of males. All females ranged much farther outside of the home range of individual males than inside, and most females spent most of the observation time outside of the home range of any one male. These results effectively disproved the hypothesis of spatially-defined, single-male, multi-female units. Rather, large groups consist of females ranging freely over the discrete home ranges of several males. |
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