Ikumi Beach in Toyo Town, is known for a nesting site of loggerhead turtles
in Kochi Prefecture. All nests have been relocated to a safety site to
prevent eggs from being hit by waves. Predation on turtle nests by wild
animals was first reported in 2010. and predation occurs every since then.
Automatic cameras with an infrared sensor switch were used to identify
the suspected animals of predation. Animals observed by the cameras around
the beach were dogs, foxes, raccoon dogs, cats, masked palm civets, deer,
hares and mice. Animals observed by the camera at the relocated nest were
dogs, foxes, cats and crows. A video taken by the camera showed that foxes
excavated the relocated nest and preyed on eggs, suggesting that the foxes
are the suspicious animals of predation at this beach. In addition, another
video showed that a crow excavated and picked an egg in its mouth. Because
the crow appeared after the fox predation, the crow predation may be considered
as a secondary effect of the foxes.
A list of Avifauna at the 4 tidal flats of Urado Estuary in Kochi Prefecture
were investigated for the waterfowl species in 2014-2016. A total of 873
individuals and 16 species were found on those tidal flats. This paper
shows the list of waterfowl in the study site.
To assess influences of light and substrate conditions on Hinoki cypress
Chamaecyparis obtusa(Sieb.et Zucc.)Endl. establishment in warm-temperate mixed forest,size
structures of canopy trees and tree species composition within a gap formed
by uprooting of a canopy tree in 1997 were compared to those under the
closed forest in Ichinomata Conservation FOrest, Shikoku, Japan. In the
study site, Hinoki cypress were dominant in the forest canopy; however,
there were no seedlings(H<1.3m) and saplings (GBH<15cm,H≧1.3m) under
the closed canopy. Within the uprooting gap, we found 13 and one individuals
of seedlings and saplings, respectively. The established seedlings, however,
were found on stable bare gound but not found on unstable colluvial slope.
The existence of seedlings and saplings of Hinoki cypress within the gap
may be due to the improvement of light condition by gap formation, and
removal of litters that prevent seedling establishment. These results suggest
that gap formation may contribute for Hinoki cypress estabulishment, but
other factors, such as existence of litters and ground stability, are important
高知県から得られたニシン科魚類カタボイワシ Sardimella lemuru の記録および本種の日本における出現状況
The clupeoid fish Sardinella lemuru Bleeker, 1853 is recorded for the first time from Shikoku Island,Japan, on the basis of a single specimen (215.7mm standard length) collected by seine net in the waters off Kochi City. The specimen is described and a photograph provided. The distribution of S. lemuru in Japanese waters, including confirmed records from Kyushu, the Japan Sea, Seto Inland Sea, and Sagami Bay , is discussed.
コウモリ用模擬枯葉を利用したヤマネ Glirus japonicus （齧歯目：ヤマネ科）
In the Shikoku mountains, during a study of bats(Murina ussuriensis) with artificial shelters, I once observed a Japanese dormouse (Glirulus japonicus) occupied it in daytime. I also found circumstantial evidence of the dormice using the artificial shelters. One is that stripped plant barks were brought into a small room of the artificial shelter, and another is that the material of the artificial shelter (hemp) was partially untied to fibers. These findings suggest that the artificial shelter has a potential to study wild dormice without using nest boxes.
Bulletin of the Shikoku Institute of Natural History NO.10