Morphological traits of indigenous field carps maintained in traditional rice-based farming systems

Ying yong sheng tai xue bao = The journal of applied ecology
Liang GuoXin Chen

Abstract

Rice-fish is an important traditional farming system. In the rice-fish system, common carp (Cyprinus carpio) is the major species raised in paddy field where the environment is characterized by shadow water. Under a long-term of natural selection and artificial selection, the carp would adapt to the paddy field environment. We investigated two indigenous carps (C. carpio qingtianensis and C. carpio congjiangensis) that originated and evolved in the Globally Important Agriculture Heritage System (GIAHS) 'rice-fish system' in Qingtian, Zhejiang Province and 'rice-fish-duck system' in Congjiang, Guizhou Province. We measured the morphological traits of indigenous carps by collecting carp samples from 'rice-fish system' and 'rice-fish-duck system'. We used mitochondrial gene (D-loop) to build phylogenetic tree. We also collected data of morphological traits of other carp populations from documented databases and published papers. Both traditio-nal morphometric analysis and landmark based geometric morphometric analysis showed that Qingtian field carp and Congjiang field carp differed in body shape. Compared with Qingtian field carp, Cong-jiang field carp had a longer and more narrow tail, and lower ratio of tail length to body leng...Continue Reading

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