【摘要】 于1994年12月—1995年3月（南极夏季）期间，对南极菲尔德斯半岛卵石滩、岩石滩潮间带南极帽贝的种群数量、垂直分布进行了定点、定时、定量的调查和观察。结果表明，南极帽贝的种群数量有明显下降，分别仅为起始数量的35％和52％。卵石滩潮间带的帽贝分布于中潮区及低潮区，尤其是低潮区，且有随季节（冬季来临）向潮下带移动的趋势。岩石滩潮间带的帽贝具有类似的垂直分布特征，但其在分布带上的发生频次有很大差异，呈波动状态。在垂直岩面上，帽贝数量在低潮区的底部更为集中。讨论了导致数量变化、垂直分布的可能原因。今后有必要深入研究种群数量的时空动态及其调控机理。更多还原

【Abstract】 During the sumrner (December 1994 to beh 1995) in Anfortica, investigations at fixed stations were made into the population qUanhty and vertical distribution of the Anthehc limpet (Nacella concinna) on the pebble beach, rocky beach and ver-tical cliffs, respectively, of the intertidal zone of the Fildes peninsula Antarctica. On the pebble beach, three sampling zones, each 1m wide and spaced 2m apart were set up; piles were driven and connected with ropes to serve as marks for sampling at the high and low tide areas. The quantities of Nacella concinna and Neptunea sp. living in the sampling zone, the cover percentage of the algae and the distribution of benthic algae were counted and recorded for every 1m×1m quadrats The spatial distribution of Nacella concinna was studied by setting up 16×16 quadrats 0.1m×0.1m each and the quantity was recorded. On the rocky beach one sampling zone was set up. On the cliff the vertical distribution of Nacella concinna was inveshgated by counting layer by layer (0.1m) from the high to low hde areas.An obvious drop in the population quantity of Nacella concinna on the pebble and rocky beash to 35% and 52% of its inihal quanhty, respechvely, was found from Dec. 1994 to March 1995.The limpet on the pebble beach was distributed in the mid-tide and low-tide areas and, especially in the lowhde area they showed a tendency to migrate towards the infralittoral zone along with the coming of winter on the rocky beach the limpet had a similar vertical distribution, bu there appeared large differences in occurrence frequency. showing a state of fluctuation. on the vertical cliffs, the limpets were even more concenatd on the bottom of the low-tide area. During the inveshgation, 7 or 8 Neptunea sp. were preying upon the limpets in the samping zone. The tendency of the vallation of the wttative distribution of the Neptunea sp. was opposite to that of the limpets. The birds represented by torus dominicanus prey on the limpets, which amounted to 26.9% of the food of the bird. Each bird can consume 8.63 limpets every day.The food of the limpets consists mainly of benthic algae. Determinations were made of the chlorophyll-a content of benthic algae in the hde area where the limpets were mainly distributed. In the midhde area the chlorophyll-a content increased every day, the tendency of the vdriations in the content was opposite to tha of the limpets.This paper ouly reveals the quantative variations and venical distribution of the limpets in summer. It is necessary to make systematic investigations successively in the samping sites to reveal the interannual variations, and the pattems of dyndrics and controf mechanisms.On the rocky beash the Ppedation of Neptunea sp. is not seen and the quantity of Nacella concinna also drop bu the pereentage is slightiy lower. As the preclation of Nacella concinna by hirds is strong, it is necessew to study and the key factor of the vdrious lethal factors- Among the factors causing drop in quantity of population there is the fartor of migration besides death. There is a tendency for the limpets on the pebble beash to ndgthe towards the infralittoral zone in winter.Hence, it is necessare to furthr study the relations between the distribution fetas of the limpets and the environment and food, and the patterns of the ndgration and spread of the limpets.Owing to different ecological environmnts and bottom matorial there may be differences in the quantitative variation and vertical distribution of Nacella concinna, in view of the fact tha its density on the rocky beach is several hmes tha on the pebble beash. Hence, it is necessare to investigate into the food habit of Nacella concinna, the quantative variation of its ingestion of algae and the distribution of the algae.更多还原