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 1114 Benthic biology o o CO UJ o LU D. CO Lil > I- < _l O 30 25 20- AKUN ISLAND AMAK ISLAND OTTER ISLAND ST. GEORGE ISLAND 4 5 6 NUMBER OF SAMPLES 10 Figure 64-3. Species-area curves of mollusks in quadrats collected in the intertidal region at four islands in the Bering Sea. The shores of two islands (Otter and St. George) are frequently scoured by sea ice. Islands leveled off at the lowest species counts (4 and 7; Fig
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 1114 Benthic biology o o CO UJ o LU D. CO Lil > I- < _l O 30 25 20- AKUN ISLAND AMAK ISLAND OTTER ISLAND ST. GEORGE ISLAND 4 5 6 NUMBER OF SAMPLES 10 Figure 64-3. Species-area curves of mollusks in quadrats collected in the intertidal region at four islands in the Bering Sea. The shores of two islands (Otter and St. George) are frequently scoured by sea ice. Islands leveled off at the lowest species counts (4 and 7; Fig. 64-3); the curve for Akun Island increased to the highest count (27). The curve for Amak Island reflected an intermediate species richness. Therefore, the results of the comparisons of molluscan species- area curves between islands paralleled results of the species counts of most other major taxa (Figs. 64-2 and 64-3). Species-importance curves In order to examine the distribution of biomass (wet weight) among mollusks, I used species-impor- tance (=dominance-diversity) curves (Whittaker 1965, 1970, 1972). Species-importance curves are constructed by plotting the importance (usually in terms of abundance, biomass, coverage, or productiv- ity) of a species on the ordinate (on a logarithmic scale) opposite its rank in the measure of importance selected on the abscissa, on which species are ranked from most to least important. Whittaker (1965) has found that, at least in terrestrial plant communities. three of the measures of importance commonly used by various authors, coverage, biomass, and produc- tivity, produce species-importance curves which differ in steepness but not in form. BatzU (1969) has claimed that in the rocky intertidal region, biomass is a better measure of importance than number of individuals. Three theoretical distributions of importance among species occur frequently in the literature; May (1975) relates them. The most uniform is the broken-stick distributi
Size: 1647px × 1215px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
