摘要
鱼类食物网是海洋生态系统中物质循环与能量流动的重要途径,营养结构则是表明能量流动过程中不同消费者的营养水平以及消费者之间的营养关系,二者对研究海洋生态系统中鱼类捕食与被捕食、种间竞争、种群调节以及数量变动等都具有重要意义。但国内、外关于长江口鱼类食物网及营养结构的研究尚未见详细报道。
Analysis of 6183 stomach contents of 60 fish species collected from the Changjiang River Estuary during 1985 - 1988 and 1991 - 1993 showed that 10 species of the fish were plank-tophagic with pelagic copepod as their main food items, 14 species were benthophagic, mainly feeding on benthic crabs and shrimps, 11 species were nektophagic,mainly preying on cuttlefish and small fish,other 25 species were mixed feeding fish with crabs ,shrimps ,cuttlefish and small fish as their main prey items.Among the 60 fish species, 12 species belong to the low trophic level group(3. 0 - 3. 5, photoplankton is 1. 0);and most of them were planktophagic; 11 species belong to the high trophic level group(4. 1 - 4. 5)and all of them were nektophagic,other 37 species belong to the middle trophic level group (3. 6 - 4. 0). Two main food chains found in the food web of fish in the Changjiang River Estuary were : one is infauna and benthic diatom→ benthic crabs and shrimps→low trophic level fish (small benthic fish)→middle trophic level fish→high trophic level fish, the other is photoplankton→zooplankton→ low trophic level fish (small pelagic fish)→middle trophic level fish→high trophic level fish.The main food items such as crabs shrimps,cuttlefish and small fish are abundantly distributed in the Changjiang River Estuary and supply sufficient food for the predators, which is favourable to the stability of the fish populations in this area.
出处
《海洋科学集刊》
CAS
1997年第1期143-153,共11页
Studia Marina Sinica
基金
国家自然科学基金
39170167号
