The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 970 Plankton ecology E o O STA 19 STA 17 STA 4 STA 9 STA 11 STA 7 J \ l__L I J \ \ I 10 20 30 40 50 60 70 80 90 100 110 ESD(>im) Figure 1. Distribution of particle sizes at 10 m for selected stations along the PROBES transect on Leg III, 1979. measurements, the observed rates of ingestion exhibited small differences over wide ranges of grazer concentration and tended to cluster by regime; rates associated with
The Eastern Bering Sea Shelf The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder easternberingsea00hood Year: 1981 970 Plankton ecology E o O STA 19 STA 17 STA 4 STA 9 STA 11 STA 7 J \ l__L I J \ \ I 10 20 30 40 50 60 70 80 90 100 110 ESD(>im) Figure 1. Distribution of particle sizes at 10 m for selected stations along the PROBES transect on Leg III, 1979. measurements, the observed rates of ingestion exhibited small differences over wide ranges of grazer concentration and tended to cluster by regime; rates associated with the middle- shelf and coastal community were about three times those measured for the outer-shelf/oceanic regime. The averages for these two areas based on this small number of observa- tions are different (P E 10 100 200 300 400 mg dry weight (per 20 liter) Figure 2. Relationships between ingestion rates and the number (a) or mass (b) of organisms in experimental containers (a indicates middle-shelf/coastal assemblage; o indicates oceanic/outer-shelf group). and biomass distributions is established early in April; observa- tions are lacking for the summer and early fall seasons. Given this constraint, secondary production values were computed from the cross-shelf grazing structure with a carbon gross- growth efficiency of 30 percent (Mullin and Brooks 1970) and a production period of 150 days. Estimates for four community types were obtained by partitioning the transect grazing rates into: (1) oceanic (Stations 1-2); (2) shelf break (Stations 3-6); (3) outer shelf (Stations 7-13); and (4) middle and coastal (Stations 14-19) and applying the oceanic/outer- shelf grazing rate to the first three areas and the middle- shelf and coastal rates to the last six stations on the transect. In summary, rates of ingestion and secondary production included by the author must be considered first-order esti- mates, at best, of unknown bias. They are presented for want of more precise measure
Size: 1065px × 1877px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
