Lifetime reproductive success in the spotted sandpiper (Actitis macularia) : sex differences and variance components |
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| Authors: | Lewis W Oring Mark A Colwell J Michael Reed |
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| Institution: | (1) Department of Biology, University of North Dakota, 58202 Grand Forks, ND, USA;(2) Present address: Ecology, Evolution and Conservation Biology Program, RWF, University of Nevada, 1000 Valley Rd, 59812 Reno, NV, USA;(3) Present address: College of Natural Resources, Department of Wildlife Management, Humboldt State University, 95521 Arcata, CA, USA |
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| Abstract: | Summary Lifetime reproductive success (LRS) of male (N=103) and female (N= 66) spotted sandpipers (Actitis macularia) was studied for 13 years of a 17-year study at Little Pelican Island, Leech Lake, Minnesota. There was no sex difference in longevity, but females had significantly more mates, eggs, chicks, fledged young, and young returning in subsequent years than did males. Variance in LRS was partitioned into five life-history components: longevity (L), mates per year (M), eggs per mate (E), proportion eggs hatched (H), and proportion of chicks fledged (F). For both sexes, F accounted for the greatest proportion of variance in LRS (males, 43%; females, 47%), followed by L (males, 26%; females, 43%) and H (males, 21%; females, 28%). Positive covariance between H and F was consistent with predator-caused clutch and brood loss. Contrary to our expectations, males had a higher coefficient of variation in reproductive success than did females. This was because males were relatively more likely than females to produce no young.Offprint requests to: L.W. Oring at the current address |
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