Food consumption by bathyal decapod crustacean assemblages in the western Mediterranean: predatory impact of megafauna and the food consumption food supply balance in a deep-water food web
Food consumption by bathyal decapod crustacean assemblages in the western Mediterranean: predatory impact of megafauna and the food consumption food supply balance in a deep-water food web
复制标题
DOI：
10.3354/meps171233
复制
发表时间：
1998-01-01
影响因子：
2.5
通讯作者：
Maynou, F
中科院分区：
文献类型：
--
作者：
Cartes, JE;Maynou, F
通过对加泰罗尼亚海（地中海西北部）中部和下部斜坡（深度分别为610-710 m和1178-1240 m）进行2个连续采样周期，获得十足类组合消耗的每日口粮估计值。十足类年食物消耗量从中坡的82.2 mg干重（DW）m（-2）yr（-1）下降到下坡的20.4 mg DW m（-2）yr（-1）。此外，还根据文献资料，评估了我国深海区鱼类的食物消耗以及大型底栖生物和大型浮游生物的次级生产。结合巨型动物（十足类甲壳类加鱼类）的食物消费，提出了一个模型的食物供应-食物消费平衡的中坡，唯一的深度层，有足够的信息存在。在中坡，巨型动物的年食物消耗量为160毫克干重·米（-2）·年（-1），而占优势的大型底栖动物分类群（上底栖动物、表底栖动物和底栖动物）的次级生产量估计为150毫克干重·米（-2）·年（-1）。底栖动物是我们的巨型动物中坡社区的食物供应的主要贡献者。大型浮游生物的年均贡献是次要的，虽然它可以是季节性的重要。磷虾类是中坡大型浮游生物的优势类群，只有10.6%的次级生产力（7.3 mg DW m（-2）yr（-1））被十足类消耗，而我们的中半深海群落消耗的磷虾类总产量几乎达不到20%。研究结果表明，在中坡，食物消费与食物供给之间处于紧平衡状态。中坡巨型动物的食物消费量估计值（0.059克厘米-2年-1）相当于底栖和底栖上层大型动物生产量的计算值。在对底栖生物（从大型底栖动物到沉积物细菌）的新陈代谢进行校正后，这一数值也与通过沉积作用估算的中坡有机碳值（1.8克厘米-2年-1年）一致。这些结果与普遍接受的观点一致，即食物是深海营养网的主要限制因素。
Estimates of the daily ration consumed by decapod assemblages were obtained from 2 continuous sampling cycles conducted over the middle and lower slope (610-710 m and 1178-1240 m depth respectively) of the Catalan Sea (NW Mediterranean). Annual food consumption by decapods decreased from 82.2 mg dry weight (DW) m(-2) yr(-1) on the middle slope to 20.4 mg DW m(-2) yr(-1) on the lower slope. Additionally, from literature sources, the food consumption by fishes and the secondary production of macrobenthos and macroplankton were assessed for our deep-sea area. Combining the food consumption of megafauna (decapod crustaceans plus fishes), a model of the food supply-food consumption balance was proposed for the middle slope, the only depth stratum for which adequate information exists. On the middle slope, annual food consumption by megafauna amounted to 160 mg DW m(-2) yr(-1) while secondary production by the dominant macrobenthic taxa (suprabenthos, epibenthos and infauna) was estimated at 150 mg DW m(-2) yr(-1). Benthos was the main contributor to the food supply in our megafaunal mid-slope communities. The mean annual contribution of macroplankton was secondary, although it can be seasonally important. Euphausiids were the dominant macroplankton taxon over the middle slope, and only 10.6% of their secondary production (7.3 mg DW m(-2) yr(-1)) was estimated to be consumed by decapods, whereas the total estimated euphausiid production consumed by our mid-bathyal community hardly attained 20%. Our results showed a tight equilibrium between food consumption and food supply on the middle slope. Estimated food consumption by mid-slope megafauna (0.059 g C m(-2) yr(-1)) is equivalent to calculated Values for production by benthic and suprabenthic macrofauna. This value is also consistent with estimates of mid-slope organic carbon through sedimentation (1.8 g C m(-2) yr(-1)), after correcting for metabolism by benthos (from macrofauna to sediment bacteria). These results are consistent with the commonly accepted idea that food is the main limiting factor in deep-sea trophic webs.