. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TROPHIC IMPACTS OF REDUCED B1OMASS IN THE ROSS SEA 95 A) Dec. 1997 B) Dec. 1998 C) Dec. 1999 170° e 180°E <7n" W. -1 0 1 log chlorophyll a (mg m 3) Figure 2. Ross Sea chlorophyll a (Chi) concentrations, representing the monthly mean of sea-ice-free pixels at 9-km resolution, derived from satellite ocean color imagery obtained from Sea-viewing Wide Field-of-view Sensor (SeaWiFS; Level 3 Standard Mapped Image, Reprocessing #4) (33) for December 1997 (Al-2002 (F). Gray areas designate land and white areas i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TROPHIC IMPACTS OF REDUCED B1OMASS IN THE ROSS SEA 95 A) Dec. 1997 B) Dec. 1998 C) Dec. 1999 170° e 180°E <7n" W. -1 0 1 log chlorophyll a (mg m 3) Figure 2. Ross Sea chlorophyll a (Chi) concentrations, representing the monthly mean of sea-ice-free pixels at 9-km resolution, derived from satellite ocean color imagery obtained from Sea-viewing Wide Field-of-view Sensor (SeaWiFS; Level 3 Standard Mapped Image, Reprocessing #4) (33) for December 1997 (Al-2002 (F). Gray areas designate land and white areas indicate the presence of sea ice. The dashed magenta line represents Ihe average extent of sea ice determined from passive microwave satellite data (SSM/I NASA Team Algorithm). The sea ice extent and Chi data reported in Table 1 were determined from the area within this line. The location of the B15A iceberg is shown as a solid magenta shape. reproduction. A positive correlation between egg produc- tion and availability of food ( Limacina) has been dem- onstrated in the laboratory for C. limacina (3). L. helicina is typically abundant throughout the Southern Ocean, sometimes displacing krill as the dominant zoo- plankton (17). In McMurdo Sound. L. helicina may consti- tute more than 20% of the zooplankton biomass and reach concentrations exceeding 300 individuals per cubic meter along the ice edge (18, 19). L. helicina is also an important prey item for a number of other species in the Antarctic, including whales and myctophid and notothenioid fishes (4, 20), themselves important components in the diet of pen- guins and mammals (21, 22). Although Clione limacina, the northern hemisphere congener of C. antarctica, has also been reported in the diet of fishes and whales (3), C. antarctica may have limited importance for higher trophic levels in McMurdo Sound because it produces a novel "anti-feedant" compound (19). However, both L. helicina and C. antarctica are f
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
