Diversity in the ecosystems of Lake Tanganyika and Lake Biwa

坦噶尼喀湖和琵琶湖生态系统的多样性

基本信息

批准号：
04044088
负责人：
KAWANABE Hiroya
金额：
$ 15.74万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Between the end of September, 1994 and the end of January, 1995, three Japanese researchers and one Zairean researcher, Department of Fisheries, Mpulungu, Zambia, which locates the southernmost end of Lake Tanganyika, to conduct cooperative research of Lake Tanganyika between Japan and Zaire. Since implementation of the research in the Zairean and Burundian water was not possible for inter-tribe battles, the research was done in Zambian water, with cooperation with Zambian fisheries research officers at Mpulungu.The purpose of the research is to elucidate the mechanisms to maintain the fascinating biodiversity of Lake Tanganyika. Social structure, feeding behavior and geographical morph variation of algal feeding herbivorous cichlid fishes were studied in rocky littorals near Mpulungu. Distribution of Atyidae prawns was also studied in the rocky littoral area.Territoris of the genus Petrochromis species were maintained against congeneric fish. Their territories were occupied compactly … More almost all area of shallow rocky littoral. Males of Petrochromis polyodon occupy their territory neighboring with conspecific females or smaller congeneric fish, but never occupied territory with conspecific males side by side. When a male of P.polyodon was removed experimentally, its territory was taken over by the nearest conspecific male by expansion or a new immigrant of conspecific male, but never occupied by the neighbor nor a new immigrant of other congeneric species. This result suggests that intraspecific male-male aggression of P.polyodon is responsible for the maintenance of territory separation, and furthermore interspecific small habitat separation seems to facilitate coexistence of other congeneric species.Algal feeder cichlids of other genera can come in and feed on attached algae on stone in the territories of Petrochromis fish. It is hypothesised that they are permitted by Petrochromis fish by using different resource of algae which Petrochromis fish do not use. In this hypothesis underwater observations of the feeding behavior of the genera Telmatochromis and Simochromis fish were made. Fish collection of these genera were also made. Analyzes of feeding habit and mouth morphology are underway.Atyid prawns are important food organisms for benthivorous cichlid fish. Distribution of atyid prawn in the littoral rocky area was studied by pulling a net, setting traps and scooping a dipnet underwater. Analysis of the collecting specimens is underway. Less

在1994年9月底和1月底之间，三名日本式货车和一名Zairean Researcher，Mpulu ngu，Zambia的Mpulu Ngu，位于Tanganyika湖的南部末端，以对日本和Zaire之间的Tanganyika进行合作研究Zairean和Burundian是不可或缺的战斗，该研究是在水中进行的，与赞比亚渔业研究人员合作。该研究的目的是阐明维持Tanganyika湖的福特式的机制。是stungu属的人，它们的领土几乎是岩石般的och虫雄性多生子被删除了经验啤酒，但从未被邻居或其他物种的新移民占领。其他属的酸辣椒可以进食在石油上的石头领土上的石头上，假设它们是通过使用不同的Romis Fish的Petrochromis Fish允许的。以及这些属的类似鱼类的chlid Fish。较少的