Abstract
To investigate the life history and ecology of the mudskipper Periophthalmus magnuspinnatus, observations and collection were made on coastal mudflats in southern Korea. Periophthalmus magnuspinnatus was active from May to September on the mudflats, exclusively occupying rough and elevated or sloped mudflats of the seashore or the stream mouth, usually vegetated with halophilous grasses. The congeneric species, P. modestus, mainly occurred on extensive low-elevation and level mudflats with no visible vegetation. An apparent alternation of habitat use by P. modestus took place on mudflats at the stream mouth in mid-October, when P. magnuspinnatus began wintering in its burrow and P. modestus came onto the vacated mudflats to construct burrows for wintering. The active season for P. magnuspinnatus at 17°C or higher air temperature was a little shorter than that of P. modestus. Periophthalmus magnuspinnatus constructed a burrow for the entire season in the highest area of the intertidal mudflat, where they hid themselves during high tide or when frightened, whereas P. modestus were likely to use any burrow constructed by other animals or sunken places to hide. The main stomach contents of P. magnuspinnatus were crabs and gammarids. During the reproductive season from May to July, P. magnuspinnatus performed mating behaviors and constructed a spawning burrow similar to the ones known for P. modestus, except their body color turned dark and quivering body movements were observed in the mature male instead of a pink or orange body color and wiggling body movements as in P. modestus. Eggs, measuring 1.56–1.69 mm in major axis and 0.94–1.0 mm in minor axis, were laid on the ceiling and the side wall of the “J”-shaped spawning room generally known for Periophthalmus species. Young of both species started to occur on the mudflat in June.
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Acknowledgments
This study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sport, and Culture, Japan to Dr. A. Ishimatsu of ECSER, Nagasaki University (No. 15405028). Dr. J.M. Dean (the University of South Carolina) kindly commented on the manuscript. We thank Dr. Zhang, Jie (the Institute of Zoology, Chinese Academy of Sciences) who provided information on fish distribution in China. Mr. J.M. Park and Mr. H.W. Kim of Pukyong University helped us in our field surveys.
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Baeck, G.W., Takita, T. & Yoon, Y.H. Lifestyle of Korean mudskipper Periophthalmus magnuspinnatus with reference to a congeneric species Periophthalmus modestus . Ichthyol Res 55, 43–52 (2008). https://doi.org/10.1007/s10228-007-0009-y
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DOI: https://doi.org/10.1007/s10228-007-0009-y