The sergestid shrimp Lucifer in the 1970 CICAR plankton samples taken by H.M.S. “Luymes”, with notes on the Amazon river as nutrient source

In accordance with previous works, L. faxoni was found to be abundant and L. typus scarce in the changing environment of the coastal waters off northern South America. High numbers of L. faxoni were present in two types of water, viz. highly saline coastal waters with high primary productivity due to enrichment by subsurface water, and in low-salinity lenses, isolated from the Amazon outflow. Low nutrient levels, as reported before from similar low-salinity lenses are presumed to be caused by increased mixing with infertile, though highly saline Guiana Current water, and depletion by primary producers which are consumed by the relatively large Zooplankton standing stock in these lenses, of which L. faxoni comprised the bulk.