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[[file:applied-paleontology_fig17-18.png|300px|thumb|{{figure number|2}}Species inhabiting high-oxygen environments (e.g., shelf depth) are small, prolate forms; those in low-oxygen environments (e.g., basin depths) are large, lanceolate forms. Copyright: Douglas;<ref name=ch17r33 /> courtesy SEPM.]]

[[file:applied-paleontology_fig17-18.png|300px|thumb|{{figure number|2}}Species inhabiting high-oxygen environments (e.g., shelf depth) are small, prolate forms; those in low-oxygen environments (e.g., basin depths) are large, lanceolate forms. Copyright: Douglas;<ref name=ch17r33 /> courtesy SEPM.]]

Test morphologies of some closely related species of the foraminiferal genus ''Bolivina'' differ in patterns apparently related to oxygen concentration<ref name=ch17r33>Douglas, R., G., 1979, Benthic foraminiferal ecology and paleoecology: a review of concepts and methods, in Lipps, J., H., ed., Foraminiferal Ecology and Paleoecology: SEPM Short Course 6, p. 21–53.</ref><ref name=ch17r34>Douglas, R., G., 1981, Paleoecology of continental margin basins: a modern case history from the borderland of southern California, in Depositional Systems of Active Continental Margin Basins: Pacific Section of Society of Economic Paleontologists and Mineralogists Short Course Notes, p. 121–156.</ref> in modern environments along the California continental margin. Compressed, relatively large species (''B. argentea'') are typical of low-oxygen environments.

Test morphologies of some closely related species of the foraminiferal genus ''Bolivina'' differ in patterns apparently related to oxygen concentration<ref name=ch17r33>Douglas, R., G., 1979, Benthic foraminiferal ecology and paleoecology: a review of concepts and methods, in Lipps, J., H., ed., Foraminiferal Ecology and Paleoecology: SEPM Short Course 6, p. 21–53.</ref><ref name=ch17r34>Douglas, R., G., 1981, Paleoecology of continental margin basins: a modern case history from the borderland of southern California, in Depositional Systems of Active Continental Margin Basins: Pacific Section of Society of Economic Paleontologists and Mineralogists Short Course Notes, p. 121–156.</ref> in modern environments along the California [[continental margin]]. Compressed, relatively large species (''B. argentea'') are typical of low-oxygen environments.

In [[:file:applied-paleontology_fig17-18.png|Figure 2]], species inhabiting high-oxygen environments (e.g., shelf depth) are small, prolate forms; those in low-oxygen environments (e.g., basin depths) are large, lanceolate forms.

In [[:file:applied-paleontology_fig17-18.png|Figure 2]], species inhabiting high-oxygen environments (e.g., shelf depth) are small, prolate forms; those in low-oxygen environments (e.g., basin depths) are large, lanceolate forms.