Summary
Population density affects the dynamics of mate acquisition and the opportunity for sexual selection in natural populations of the seed bug, Neacoryphus bicrucis Say (Hemiptera : Lygaeidae). The opportunity for sexual selection and the intensity of directional sexual selection on body length increased as the population density declined within a season for a population in a small, disjunct patch of host plant, Senecio anonymus. In a larger, dispersed population, both measures of selection were greater in host plant patches of low rather than high adult density when the population was sampled at peak density. Under conditions of higher density, males were more likely to share plants, larger males were less likely to monopolize patches of host plant to which females were attracted for mating, and smaller males were more likely to mate in the presence of large males. Thus, resource defense polygyny collapsed under high density, obviating the advantage of size in territory control, and resulted in scramble competition among males for mates. The population exhibited significant additive genetic variation for body length. This suggests that natural selection acting on other components of fitness favors smaller size or that the direction of sexual selection on size fluctuates between generations in response to the between-year variation in population density. Thus, strong sexual selection appears to impose a significant genetic load.
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References
Alcock J (1979) The evolution of intraspecific diversity in male reproductive strategies in some bees and wasps. In: Blum MS, Blum NA (eds) Sexual selection and reproductive competition in insects. Academic Press, New York, pp 381–402
Arnold SJ, Wade MJ (1984) On the measurement of natural and sexual selection: theory. Evolution 38:709–719
Barton NH, Turelli M (1989) Evolutionary quantitative genetics: how little do we know? Annu Rev Genet 23:337–370
Bateman AG (1948) Intra-sexual selection in Drosophila. Heredity 2:349–368
Bateson P (ed) (1983) Mate choice. Cambridge University Press, New York
Borgia G (1979) Sexual selection and the evolution of mating systems. In: Blum MS, Blum NA (eds) Sexual selection and reproductive competition in insects. Academic Press, New York, pp 19–80
Brown D (1988) Components of lifetime reproductive success. In: Clutton-Brock TH (ed) Reproductive success. University of Chicago Press, Chicago, pp 439–453
Cade WH (1979) Evolution of alternative male reproductive strategies in field crickets. In: Blum MS, Blum NA (eds) Sexual selection and reproductive competition in insects. Academic Press, New York, pp 343–380
Cade WH (1984) Genetic variation underlying sexual behavior and reproduction. Am Zool 24:355–366
Charlesworth B (1984) The evolutionary genetics of life histories. In: Shorrocks B (ed) Evolutionary ecology. Blackwell, Oxford, pp 117–133
Clutton-Brock TH (1988) Introduction. In: Clutton-Brock TH (ed) Reproductive success. University of Chicago Press, Chicago, pp 1–10
Conner J (1989) Density-dependent sexual selection in the fungus beetle, Bolitotherus cornutus. Evolution 43:1378–1386
Darwin C (1871) The descent of man and selection in relation to sex. John Murray, London
Efron B, Gong G (1983) A leisurely look at the bootstrap, the jacknife, and cross validation. Am Stat 37:36–49
Emlen ST, Oring LW (1977) Ecology, sexual selection, and the evolution of mating systems. Science 197:215–233
Falconer DS (1989) Introduction to quantitative genetics. Longman, New York
French BW, Cade WH (1989) Sexual selection at varying population densities in male field crickets, Gryllus veletis and Gryllus pennsylvanicus. J Insect Behav 2:105–122
Grafen A (1987) Measuring sexual selection: why bother? In: Bradbury JW, Andersson MB (eds) Sexual selection: testing the alternatives. John Wiley, New York, pp 221–233
Grant BR, Grant PR (1989) Natural selection on Darwin's finches. Am Nat 133:377–393
Gwynne DT (1984) Sexual selection and sexual differences in Mormon crickets (Orthoptera:Tettigoniidae, Anabrus simplex). Evolution 38:1011–1022
Hedrick AV (1988) Female choice and the heritability of attractive male traits: an empirical study. Am Nat 132:267–276
Hubbell SP, Johnson LK (1987) Environmental variance in lifetime mating success, mate choice, and sexual selection. Am Nat 130:91–112
Johnson LK (1982) Sexual selection in a brentid weevil. Evolution 36:251–262
Kirkpatrick M (1982) Sexual selection and the evolution of female choice. Evolution 36:1–12
Lande R (1980a) Sexual dimorphism, sexual selection, and adaptation in polygenic characters. Evolution 34:292–307
Lande R (1980b) Genetic variation and phenotypic evolution during allopatric speciation. Am Nat 116:463–479
Lande R, Arnold SJ (1983) The measurement of selection on correlated characters. Evolution 37:1210–1226
Low BS (1978) Environmental uncertainty and the parental strategies of marsupials and placentals. Am Nat 112:319–335
Maynard Smith J (1978) The evolution of sex. Cambridge University Press, Cambridge
Maynard Smith J (1985) Sexual selection, handicaps and true fitness. J Theor Biol 115:1–8
Maynard Smith J, Brown LRW (1986) Competition and body size. Theor Pop Biol 30:166–180
McCauley DE (1981) Application of the Kence-Bryant model of mating behavior to a natural population of soldier beetles. Am Nat 117:400–402
McCauley DE (1983) An estimate of the relative opportunities for natural and sexual selection in a population of milkweed beetles. Evolution 37:701–707
McCauley DE, Wade MJ (1978) Female choice and the mating structure of a natural population of the soldier beetle, Chauliognathus pennsylvanicus. Evolution32:771–775
McLain DK (1981a) Interspecific interference competition and mate choice in the soldier beetle, Chauliognathus pennsylvanicus. Behav Ecol Sociobiol 9:65–66
McLain DK (1981b) Resource partitioning by three species of hemipteran herbivores on the basis of host plant density. Oecologia 48:414–417
McLain DK (1982) Density dependent sexual selection and positive phenotypic assortative mating in natural populations of the soldier beetle, Chauliognathus pennsylvanicus. Evolution 36:1227–1235
McLain DK (1984a) Host plant morphology, speciation, and the economics of mate choice in the soldier beetle, Chauliognathus pennsylvanicus. Evol Theory 7:63–67
McLain DK (1984b) Host plant density and territorial behavior of the seed bug, Neacoryphus bicrucis (Hemiptera:Lygaeidae). Behav Ecol Sociobiol 14:181–187
McLain DK (1986a) Null models and the “intensity” of sexual selection. Evol Theory 8:49–51
McLain DK (1986b) Resource patchiness and the intensity of sexual selection in a resource defending polygynous insect species. Oikos 47:19–25
McLain DK (1987) Heritability of size, a sexually selected character, and the response to sexual selection in a natural population of the southern green stink bug, Nezara viridula (Hemiptera: Pentatomidae). Heredity 59:391–395
McLain DK (1989) Prolonged copulation as a post-insemination guarding tactic in a natural population of the ragwort seed bug. Anim Behav 38:659–664
McLain DK (1991a) Components of variance in male lifetime copulatory and reproductive success in a seed bug. Behav Ecol Sociobiol 29:121–126
McLain DK (1991b) The r-K continuum and the relative effectiveness of sexual selection. Oikos 60:263–265
McLain DK, Boromisa RD (1987) Male choice, fighting ability, assortative mating and the intensity of sexual selection in the milkweed longhorn beetle, Tetraopes tetraophthalmus (Coleoptera:Cerambycidae). Behav Ecol Sociobiol 20:239–246
McLain DK, Shure DJ (1987) Pseudocompetition: interspecific displacement of insect species through misdirected courtship. Oikos 49:291–298
McLain DK, Shure DJ (1990) Spatial and temporal density dependence of host plant patch use by the seed bug, Neacoryphus bicrucis (Hemiptera: Lygaeidae). Oikos 58:306–312
Partridge L, Halliday T (1984) Mating patterns and mate choice. In: Krebs JR, Davies NB (eds) Behavioral ecology: an evolutionary approach. Sinauer, Sunderland, pp 222–250
Price GR (1970) Selection and covariance. Nature 227:520–521
Price TD (1984) Sexual selection on body size, territory and plumage variables in a population of Darwin's finches. Evolution 38:327–341
Rice WR (1989) Analyzing tables of statistical tests. Evolution 43:223–225
Seger J (1985) Unifying genetic models for the evolution of female choice. Evolution 39:1185–1193
Simmons LW, Bailey JW (1990) Resource influenced sex roles of zaprochiline tettigoniids (Orthoptera:Tettigoniidae). Evolution 44:1853–1868
Slatkin M (1987) Quantitative genetics of heterochrony. Evolution 41:799–811
Solbreck C (1978) Migration, diapause, and direct development as alternative life histories in the seed bug, Neacoryphus bicrucis. In: Dingle H (ed) Evolution of insect migration and diapause. Springer, Berlin Heidelberg New York, pp 196–217
Southwood TRE (1978) Ecological methods. Methuen, London
Sutherland WJ (1987) Random and deterministic components of variance in mating success. In: Bradbury JW, Andersson MB (eds) Sexual selection: testing the alternatives. John Wiley, New York, pp 209–220
Thornhill R, Alcock J (1983) Evolution of insect mating systems. Harvard University Press, Cambridge
Trivers RL (1972) Parental investment and sexual selection. In: Campbell B (ed) Sexual selection and the descent of man. Aldine Press, Chicago, pp 136–179
Trivers RL (1985) Social evolution. Benjamin Cummings, Menlo Park
Turelli M (1984) Heritable genetic variation via mutation selection balance: Lerch's zeta meets the abdominal bristle. Theor Pop Biol 25:138–193
Wade MJ (1987) Measuring sexual selection. In: Bradbury JW, Andersson MB (eds) Sexual selection: testing the alternatives. John Wiley, New York, pp 197–208
Wade MJ, Arnold SJ (1980) The intensity of sexual selection in relation to male sexual behaviour, female choice, and sperm precedence. Anim Behav 28:446–461
Wilkinson L (1987) Systat: the system for statistics. Systat Inc, Evanston
Wilson DS, Hedrick AV (1982) Speciation and the economics of mate choice. Evol Theory 6:15–24
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McLain, D.K. Population density and the intensity of sexual selection on body length in spatially or temporally restricted natural populations of a seed bug. Behav Ecol Sociobiol 30, 347–356 (1992). https://doi.org/10.1007/BF00170602
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DOI: https://doi.org/10.1007/BF00170602