The influence of temperature on the functional response of the dragonfly Celithemis fasciata (Odonata: Libellulidae) |
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Authors: | Susan E. Gresens Marian L. Cothran James H. Thorp |
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Affiliation: | (1) Department of Botany, Faculty of Science, University of Tokyo, Hongo, 113 Tokyo, Japan;(2) Division of Environmental Biology, National Institute for Environmental Studies, Yatabe, 305 Ibaraki, Japan |
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Abstract: | Summary Four biennial species (Oenothera erythrosepala, Dontostemon dentatus, Erigeron strigosus, and Erigeron sumatrensis) from the dune system at Azigaura, Japan, were sand-cultured in pots with different nutrient levels, and the critical plant size for the development of a flowering stalk was determined. The critical size decreased in the order O. erythrosepala>E. strigosus>D. dentatus=E. sumatrensis, and corresponded to the order of their distribution along the gradient of soil fertility in the dune system. This correspondence is discussed, and it is concluded that in a less fertile environment, biennials producing seeds after attaining a larger size have an advantage over those producing seeds earlier. |
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