陸奥湾におけるマガレイとマコガレイの食物関係〔英文〕

概要

論文の詳細を見る
Feeding interrelation between Pleuronectes herzensteini and Pleuronectes yokohamae was studied in Mutsu Bay. Catches in experimental seines and trawls conducted between 1977 and 1986 showed that in general, both species did not differ very much in biomass. Comparisons of the stomach contents indicated that the food segregation between these two species was insignificant during spring and was relatively large during summer. In addition, considering that they exhibit a similar diel and seasonal rhythms of feeding except in winter, an intense potential for competitive interaction of food between these two species was expected, especially in spring. However, from spring to autumn, distinct habitat segregation was found between P. herzensteini and P. yokohamae, and such an ecological segregation reduces their competition for food. In spring and summer, unlike the P. yokohamae, the CPUE of P. herzensteini were inversely related to the prey biomass, because they were concentrated in West Bay where the prey biomass was less than in East Bay. No particular change from year to year was found in the space utilization pattern of P. herzensteini, despite the fact that the P. yokohamae biomass declined largely after 1983, indicating that the habitat segregation between these two species is basically affected by the physical or chemical conditions of the sea water.
日本水産学会 = The Japanese Society of Scientific Fisheriesの論文