Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Egg Size and Growth Rate in Theodoxus fluviatilis (L)

R. A. Orton and R. M. Sibly
Functional Ecology
Vol. 4, No. 1 (1990), pp. 91-94
DOI: 10.2307/2389657
Stable URL: http://www.jstor.org/stable/2389657
Page Count: 4
  • Read Online (Free)
  • Download ($18.00)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Egg Size and Growth Rate in Theodoxus fluviatilis (L)
Preview not available

Abstract

Life-cycle theory suggests that smaller reproductive propagules should be produced in environments in which juvenile growth rate is higher. It has recently been shown that this holds both if adult size is fixed and if the timing of breeding is fixed. Here we test the prediction qualitatively in natural populations of Theoxodus fluviatilis (L.). Capsule size and juvenile growth rate were measured at five sites in southern England. Significant differences between sites were found in both characters. Larger capsules occurred at the sites with lower growth rate, as predicted by life-cycle theory.

Page Thumbnails

  • Thumbnail: Page 
91
    91
  • Thumbnail: Page 
92
    92
  • Thumbnail: Page 
93
    93
  • Thumbnail: Page 
94
    94