. Bulletin of the British Museum (Natural History), Geology. New Brunswick. 0 1CM 12 12 13 ^ u m 15 wm u OTHERS I I L_l [__l OTHERS B OTHERS | I I I I l_l I I I I I I l__l D Fig. 26 Local examples of the Salopina Parallel Communities. Column B shows inferred life positions, and columns A, C and D show ventral views of the pedicle valve; low abundances are exaggerated to 2%. A - 'mixed Salopina conservatrix - Eocoelia Communities' of Watkins & Boucot (1975); B - Salopina Community of Calef & Hancock (1974); C - Protochonetes ludloviensis Association of this report; D - Salopina submedia
. Bulletin of the British Museum (Natural History), Geology. New Brunswick. 0 1CM 12 12 13 ^ u m 15 wm u OTHERS I I L_l [__l OTHERS B OTHERS | I I I I l_l I I I I I I l__l D Fig. 26 Local examples of the Salopina Parallel Communities. Column B shows inferred life positions, and columns A, C and D show ventral views of the pedicle valve; low abundances are exaggerated to 2%. A - 'mixed Salopina conservatrix - Eocoelia Communities' of Watkins & Boucot (1975); B - Salopina Community of Calef & Hancock (1974); C - Protochonetes ludloviensis Association of this report; D - Salopina submedia Community of Watkins & Boucot (1975). 1 - Salopina conservatrix (McLearn); 2 - S. lunata (Sowerby); 3 - S. submedia (McLearn); 4 - Pro- tochonetes tenuistriata (Hall); 5 - P. ludloviensis Muir-Wood; 6 -Protochonetes sp.; 7 - "Camaro- toechid1 rossonia McLearn; R-'Camarotoechia' spp.; 9-'C nucula (Sowerby); 10- Eocoelia sulcata (Prouty); 11 - E. ange/ini (Lindstrom); 12 - Howellella elegans (Muir-Wood); 13 - Howell- ella sp.; 14 - Orbiculoidea sp.; 15-0. rugata (Sowerby). The Ludlow fauna corresponds to the stability-time hypothesis in showing highest species diversity in the low-stress distal shelf environment. Rollins & Donahue (1975) have used such diversity relations to infer the existence of biological accommodation in such communities, a type of biotic interaction which can lead to progressive niche-partitioning and diversity increase. As Ludlow communities of distal shelf environments show no increase in diversity with temporal persistance of low-stress conditions, and do not show a successional pattern in cycles of species, they were probably not biologically-accommodated. If predation was important in the high- diversity communities, as suggested in the biotic interaction section, p. 249, it contributed to an overall stability in diversity and not a general Please note that these images are extracted from scanned page images that may have been d
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