Assessment of a unionid freshwater mussel (Pronodularia japanensis) population in an agricultural channel during the 4 years following reintroduction
| Autor: | Akio Oomori, Kaito Asato, Kazuo Ito, Yuya Saito, Kazuki Miura, Junjiro N. Negishi, Hokuto Izumi |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Unionoida education.field_of_study Ecology biology 010604 marine biology & hydrobiology Population size Population Endangered species Mussel Management Monitoring Policy and Law biology.organism_classification 010603 evolutionary biology 01 natural sciences Substrate (marine biology) Fishery Habitat Juvenile education Nature and Landscape Conservation |
| Zdroj: | Landscape and Ecological Engineering. 14:157-164 |
| ISSN: | 1860-188X 1860-1871 |
| DOI: | 10.1007/s11355-017-0330-1 |
| Popis: | Detailed procedures for the reintroduction of endangered freshwater mussel species (order Unionoida) after habitat modification, and the population-level consequences of this, have not been reported for agricultural channels. We reintroduced Pronodularia japanensis (Lea, 1859) into a 70-m-long channel after a concrete lining had been inserted. The habitat quality was improved by providing a channel bed with gravel-sand substrate. Four years of monitoring following the reintroduction (3.5 years over four growing and reproductive seasons) showed the continuous recruitment of juvenile P. japanensis to a total of 79 individuals, but a decrease in the number of reintroduced individuals 440 to 118. The population size reached a relatively stable in the first 0.7 years, but remained approximately half the original size for the rest of the monitoring period, despite continuous recruitment. Our findings suggest that the reintroduction of freshwater mussels with appropriate treatment of their habitat helps to maintain the reproduction of local populations for at least 4 years. |
| Databáze: | OpenAIRE |
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