DEEP-SEA BIVALVES OF THE NORTH AMERICAN AND ARGENTINE BASINS: A COMPARISON OF SPECIES DIVERSITY AND FUNCTIONAL DIVERSITY USING JOHN ALLEN'S (2008) DATABASE

作者：Stuart Carol T^*; Rex Michael A

来源：Journal of Conchology, 2017, 42: 309-315.

• Deep-sea
• bivalves
• North American Basin
• Argentine Basin
• diversity

We analyzed bathymetric trends in species diversity and feeding types in deep-sea bivalves of the North American and Argentine Basins in the western Atlantic using Allen's (2008) taxonomic database, and related these trends to energy availability. Chemical energy was assessed as particulate organic carbon (POC) flux to the seafloor, and kinetic energy by bottom water temperature. POC flux and temperature show significant and highly regular exponential declines with depth, the Argentine Basin having higher POC flux and lower temperature across most of the depth range sampled (upper bathyal to abyss). Both basins show unimodal diversity-depth patterns. Peak diversity is deeper and abyssal diversity higher in the Argentine Basin. POC flux was the primary predictor of species diversity. Bivalve taxa were classified as deposit feeders, filter feeders, or carnivores as an indication of functional diversity. In both basins, deposit feeders increased with depth and filter feeders decreased, probably as a function of sediment and suspended food resources respectively. Carnivores were a minor constituent throughout the depth range. POC flux was the most effective predictor of feeding categories.

• 出版日期2017-2