Bulletin of the Shikoku Institute of Natural History NO.1
The occurrences of threatened or rare crab species of Kochi Prefecture are reported on the basis of specimens from intertidal mud-flats in Urado Estuary and Susaki Bay. In Urado Estuary,Camptandrium sexdentatum,one of the critically endangered species of Kochi Prefecture has been known only from the river mouth of Kokubu.However,Nada and the river mouth of Kuma seem to be new localities for the species.The specimens of C.sexdentatum from the river mouth of Sakura represent the first record of the species from Susaki Bay.Philyra pisum,one of the endangered species,is first recorded here from Nada and Kinuga-shima both in Urado Estuary,and Susaki Bay.The occurrence of Uca arcuata,one of the critically endangered species is reconifiemed in Susaki Bay.The six ovigerous female specimens of Halicarcinus orientalis represent the occurrence of the species for the first time from Urado Estuary,though it has been thought to be one of the data deficient species in Kochi Prefecture.Acmaeopleura toriumii is first recorded from the waters of Kochi Prefecture.These discoveries of them are discussed from the view point of species conservation.
Eleven crab species belonging to five portunid genera are reported from Urado Estuary,Kochi Prefecture.The northern range extension is recorded for Charybdis(Charybdis)anisodon De Haan,1835,presently known from Amami Island southward.The occurrence of Charybdis(Charybdis) lucifera(Fabricius,1798)and Thalamita crenata(Latreille,1829)from Kochi Prefecture are first reported based on the specimens from Urado Estuary.Intraspecific color variation found in C.(C.)lucifera is also reported.
Seventeen coastal marine fish species belonging to 11 families are reported on the basis of specimens collected from Karyogo,Nahari Town,Kochi Prefecture,facing Tosa Bay.The following thirteen species are newly recorded from Tosa Bay,though their occurrences have been recorded from Kashiwa-jima,Ohtsuki Town,Kochi Prefecture,facing the Bungo Channel:Malacanthus latovittatus,Chaetodon baronessa,Chromis vanderbilti,Plectroglyphidodon
dickii,Labrichthys unilineatus,Pseudocheilinus hexataenia,Exallias brevis,Paragobiodon
lacunicolus,Ptereleotris microlepis,Zebrasoma veliferum,Z.scopas,Rhinecanthus
rectangulus and Pervagor aspricaudus.The occurrence of P.aspricaudus represents the northernmost record for the species.A single specimen of Syngnathus schlegeli previously unknown from eastern Tosa Bay is also described.
A preliminary study of the Japanese black bear,Ursus thibetanus,by using autophotographic equipment was made in the Tsurugi Mountains,Shikoku,from July 2002 through October 2003.The animals were recorded 18 times,and frequently photographed two to three hours after dawn and within three hours before sunset.Four individuals were distinguished from their neck patches,genitals and body shape on the photographs.
In the autumn of 2003,bats utilizing hollows in the tree were studied at six localities in Kochi Prefecture,by using mist nets.Twelve individuals comprising of the following five species belonging to two families,Rhinolophidae and Vespertilionidae,were captured:Rhinolophus ferrumequinum,Myotis macrodactylus,Barbastella leucomelas,Miniopterus fuliginosus and Murina ussuriensis.Among them,B.leucomelas and M.ussuriensis are recorded here for the first time from Kochi Prefecture.
An ecological study on hibernation of bats was made at Ryugado Cave,and other ten caves and shelters in central Kochi Prefecture from 1989 to 2002.In Kochi Prefecture,Ryugado Cave in Tosa-yamada Town has been considered to be only one hibernation place for bats,and only two of eight known species from the area,Rhinolophus ferrumequinum and Miniopterus fuliginosus,utilized there for hibernation.However,the occurrences of the wintering individuals of two species,Rhinolophus cornutus and Myotis macrodactylus,were newly conifirmed at 11 study sites,though the dominant species and species composition differed among the sites.The number of individuals for each species and environmental conditions are also reported in some detail.