caa a22 4500 465788742 CHVBK 20180323112017.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF01049193 doi (NATIONALLICENCE)springer-10.1007/BF01049193 Male-biased sex ratios, female promiscuity, and copulatory mate guarding in an aggregating tropical bug, Dysdercus bimaculatus [Elektronische Daten] [Scott Carroll, Jenella Loye] The ecological and social bases of the mating system of the seed-feeding bug, Dysdercus bimaculatus(Hemiptera: Pyrrhocoridae), were studied in the lab and in aggregations at the host tree, Sterculia apetala(Malvales: Malvaceae), in Panama. On theoretical grounds, two factors are predicted to be of importance in determining the evolution of male mating tactics in Ms species: the operational sex ratio and the probability that undefended females will mate with other males, subjecting the gametes of deserters to sperm competition. Results of a study of a related species suggested that sperm displacement is probably substantial. Adult sex ratios at numerous sites were significantly male biased, and females whose mates were removed remated before oviposition (i. e., sperm utilization). These results predict that a mate defense tactic is likely to be superior to a nondefense tactic. The biological significance of the parameters is supported by observations that captive pairs often remained in copulafor several days, until just before oviposition. However, substantial variation in copulation duration was also observed, and possible causes of this variation are considered. Causes of male biased adult sex ratios were investigated by monitoring demographic changes within a single aggregation over 2 months. Both female juvenile and adult mortality rates were greater than male. In addition, dissections of reproductive adults showed that the flight muscles of females, but not males, had histolyzed, so that female reproduction is physiologically limited to a single site. Greater rates of immigration among both mature and young males suggests that an excess of males may also be found in the populations of bugs that subsequently colonize other host plants, so that female scarcity is typical of aggregations in all stages of development. The evolution of sex-limtied flight muscle histolysis may be explained by greater patchiness of females than males as mating resources, plus a lower energetic benefit/cost ratio of histolysis for males. Plenum Publishing Corporation, 1990 aggregation nationallicence dispersal nationallicence Dysdercus bimaculatus nationallicence Hemiptera nationallicence mate guarding nationallicence Panama nationallicence Pyrrhocoridae nationallicence sex ratio nationallicence sexual selection nationallicence Sterculia apetala nationallicence Carroll Scott Department of Biology, University of Utah, 84112, Salt Lake City, Utah aut Loye Jenella Department of Biology, University of Utah, 84112, Salt Lake City, Utah aut Journal of Insect Behavior Kluwer Academic Publishers-Plenum Publishers 3/1(1990-01-01), 33-48 0892-7553 3:1<33 1990 3 10905 https://doi.org/10.1007/BF01049193 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01049193 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Carroll Scott Department of Biology, University of Utah, 84112, Salt Lake City, Utah aut NATIONALLICENCE 700 1- Loye Jenella Department of Biology, University of Utah, 84112, Salt Lake City, Utah aut NATIONALLICENCE 773 0- Journal of Insect Behavior Kluwer Academic Publishers-Plenum Publishers 3/1(1990-01-01), 33-48 0892-7553 3:1<33 1990 3 10905 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer