The influence of temperature and salinity on the duration of embryonic development,fecundity and growth of the amphipod Echinogammarus marinus Leach (Gammaridae) |
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| Institution: | 1. Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Republic of Korea;2. Department of Fruit Tree, Korea National College of Agriculture and Fisheries, Jeonju 560-500, Republic of Korea;1. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Rua Arcturus, 03 - Jardim Antares, 09606-070 São Bernardo do Campo, SP, Brazil;2. Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, R. Matão, Trav. 14, 05508-090 São Paulo, SP, Brazil;3. Museu Nacional, Universidade Federal do Rio de Janeiro (UFRJ), Quinta da Boa Vista, s/n – São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil;4. Departamento de Biologia Marinha, Universidade Federal Fluminense, 24001-970 Niterói, RJ, Brazil;5. Universidade Federal do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia, Av. Carlos Chagas Filho, 373, 21941-902 Rio de Janeiro, RJ, Brazil;6. Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, 13083-970 Campinas, SP, Brazil;7. Laboratório de Estudos de Bryozoa – LAEBry, Departamento de Zoologia, Centro de Biociências, Universidade Federal de Pernambuco (UFPE), Av. Prof. Moraes Rego 1235 - Cidade Universitária, 50670-901 Recife, PE, Brazil;8. Laboratório de Evolução e Diversidade Aquática – LEDA, Departamento de Ciências Biológicas, Universidade Estadual Paulista (UNESP), FCL/Assis, Av. Dom Antônio, 2100, 19806-900 Assis, SP, Brazil;9. Departamento de Zoologia, Universidade Federal do Paraná, 81531-980 Curitiba, PR, Brazil |
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| Abstract: | The effects of salinity and temperature on the duration of embryonic development, fecundity and growth of the amphipod Echinogammarus marinus Leach from the Mondego estuary (Portugal) were studied in laboratory experiments. Combinations of three temperatures (10, 15 and 20 °C) and four salinities (10, 15, 20 and 25 ‰) were used. The duration of embryonic development was 33 ± 0.7 d (mean ± S.E.) at 10 °C, 32 ± 0.5 d at 15 °C, and 17 ± 0.3 d at 20 °C. Analysis of variance demonstrated that the duration of E. marinus embryonic development, reared under different combinations of salinity and temperature, was significantly affected only by temperature (P < 0.001). A positive correlation between the number of newborn juveniles and the size of E. marinus females (as head length) was observed. The number of juveniles released per female was higher at 10 °C and lower at 20 °C. Analysis of variance showed that only temperature significantly affected the number of juveniles released per female (P < 0.001). Experimental data were used to calibrate the von Bertalanffy growth model. Results showed that growth was continuous throughout life under all laboratory conditions. Intrinsic growth rates were higher at 20 °C and lower at 10 °C. Analysis of covariance applied over the initial 90 d after hatching showed significant differences between growth rates of E. marinus under different salinity and temperature conditions. Extrapolation of laboratory data to the field scenario suggests that E. marinus in the Mondego estuary have a multivoltine life cycle. |
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