Effects of habitat fragmentation on the amphidromous freshwater shrimp, Caridina leucosticta (Decapoda, Atyidae) in a rice paddy drainage channel

Kazuyoshi Nakata, Kunihiko Amano, Masatoshi Denda, Junji Miwa, Tatsuo Hamano

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Agricultural channels can be important habitats for aquatic species inhabiting agricultural areas. However, water supply in agricultural channels can vary substantially with types of agriculture and irrigation/drainage system, and thereby affect the viability of local populations of aquatic species. In this study, we focused on the amphidromous freshwater atyid shrimp Caridina leucosticta. To clarify whether C. leucosticta utilizes agricultural channels as a habitat in relation to fluctuations in the water supply, we conducted a series of field surveys on the distribution of this shrimp in a rice paddy drainage channel (spring-fed channel) around the Furu River, central Japan, during July and December 2008. Large numbers of C. leucosticta had migrated into that drainage channel. Water from the adjacent rice paddies had disappeared by October, because irrigation was stopped, but the water level in the drainage channel was maintained by a supply of spring water. By mid-November the supply of spring water had almost disappeared, then the channel nearly dried up, and many shrimps were concentrated in an isolated water pool in the channel. Thus, habitat fragmentation of C. leucosticta occurred in terms of water (dis-)continuity. This water pool dried up completely by mid-December. We found many dead individuals of C. leucosticta in the dried-up area of the channel. These results indicate that agricultural channels can be an important temporal habitat for amphidromous freshwater shrimps, but that the drying-up of the channels can lethally affect migrating atyid shrimps.

Original languageEnglish
Pages (from-to)1125-1133
Number of pages9
JournalCrustaceana
Volume83
Issue number9
DOIs
Publication statusPublished - Sep 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Aquatic Science
  • Animal Science and Zoology

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