Vol. 58, 2019
Habitat Partition and its Possible Genetic Background Between Two Sympatrically Distributed Eel Species in Taiwan
Hsiang-Yi Hsu1,§, Hsiao-Wei Chen1,§, and Yu-San Han1,*
of Fisheries Science, College of Life Science, National Taiwan
University, 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan.
*Correspondence: E-mail: email@example.com. Tel: 886-2-3366-3726. Fax:
§Hsiang-Yi Hsu and Hsiao-Wei Chen contributed equally to this work.
Received 19 April 2019 / Accepted 19 July 2019
Communicated by Yasuyuki Hashiguchi
The geographical distributions of Japanese eel (Anguilla japonica) and Giant-mottled eel (A. marmorata)
overlapped at many regions in East Asia, therefore, they would suffer
from an interspecific competition in the same rivers. After a long
period of adaption, Japanese eel and Giant-mottled eel may have habitat
partitioning in the rivers, to diminish the interspecific competition
between them. In this study, we conducted a field investigation in the
Fengshan River in Taiwan to survey the habitat distributions of
Japanese eel and Giant-mottled eel across a river. Moreover, we would
like to know whether their habitat distributions are related to their
swimming and upstream migration. Thus, the mRNA expression levels of
several candidate genes that may be associated with the swimming and
upstream migration of eel were examined in the glass eels of Japanese
eel and Giant-mottled eel. Field investigation indicated that the
Japanese eel mainly inhabited the lower and middle reaches of the
Fengshan River, but the Giant-mottled eel was distributed over the
middle to upper reaches. The mRNA expression levels of fMYH, dio2, gria3, and neurod1
were higher in the Giant-mottled eel than in the Japanese eel, implying
that Giant-mottled eel might have better swimming bursts and more
active upstream migration than Japanese eel. These results suggested
that there is a habitat partition when these two eel species coexist in
a river, and the habitat distributions of them may link with their
swimming bursts and upstream migration. To find out the habitat
distributions of freshwater eels is important for developing applicable
plans for eel conservation and resource management.
Key words: Giant-mottled eel, Habitat partitioning, Interspecific competition, Japanese eel and upstream migration.
HY Chen HW, Han YS. 2019. Habitat partition and its possible genetic
background between two sympatrically distributed eel species in Taiwan.
Zool Stud 58:0z. doi:-.
Supplementary Materials: Table S1 | Table S2 | Table S3