38 research outputs found
A multi-phase-field simulation of carbon steel under actual conditions of a hot rolling process
Parasitic nematodes obtained from marsupials reared at a semi-free ranging facility in a Japanese zoological park
Between 2006 and 2010, a total of 12 semi-free ranging marsupials comprising 10 Petrogale xanthopus and two Macropus giganteus died at the Itozu no mori Zoological Park (Kitakyushu, Fukuoka, Japan). From our postmortem examinations, 541 nematodes in total were obtained from the stomachs of the deceased marsupials. The nematodes belonged to the subfamily Cloacininae (Strongylida: Chabertiidae). The nematodes obtained from P. xanthopus were identified as Rugopharynx australis, Cloacina pearsoni, Cloacina hydriformis and Macroponema beveridgei, while the nematode from M. giganteus was identified as a Cloacina sp. member. This is the first record of C. pearsoni and M. beveridgei obtained from P. xanthopus. Measurements and photographs of the nematodes are provided herein to assist future continuous surveillance of them
Changes in Structure of Coral Reef Fish Communities by Destruction of Hermatypic Corals: Observational and Experimental Views
Population outbursts of the crown-of-thorns starfish, Acanthaster
planci, have drastically altered communities in many coral reef areas of
the Indo-west Pacific since the late 1960s. To understand the pattern of changes
in fish communities on damaged coral colonies, direct observations and field
experiments were carried out in inshore waters at Minatogawa, Okinawa Island
(26°16' N, 127°42' E), in 1979 and 1980. From experiments on the effects of coral
death and on the effects of decreased structural complexity of coral branches on
fish communities using five colonies of staghorn coral, Acropora sp., we were
able to predict the following changes in fish communities resulting from the
destruction of living corals by Acanthaster. Coral polyp feeders completely
disappear from dead coral colonies due to absence of their food; and the
numbers of resident species and individuals decrease due to the reduction in living
space or shelter when the structural complexity of dead coral colonies is decreased
by bio- and physical erosion. Consequently, fish species diversity also
decreases. These predicted changes are consonant with those directly observed
on nine natural dead staghorn coral colonies