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You searched for: Journal Behavioral ecology and sociobiology Remove constraint Journal: Behavioral ecology and sociobiology Subject term dimorphism Remove constraint Subject term: dimorphism
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1. Alternative mating tactics in dimorphic males of the harvestman Longiperna concolor (Arachnida: Opiliones)

Author:
Camila Zatz; Rachel M. Werneck; Rogelio Macías-Ordóñez; Glauco Machado
Source:
Behavioral ecology and sociobiology 2011 v.65 no.5 pp. 995-1005
ISSN:
0340-5443
Subject:
Opiliones; dimorphism; eggs; evolution; females; legs; males; tropics
Abstract:
... Intense male–male competition for females may drive the evolution of male morphological dimorphism, which is frequently associated with alternative mating tactics. Using modern techniques for the detection of discontinuous allometries, we describe male dimorphism in the Neotropical harvestman Longiperna concolor, the males of which use their elongated, sexually dimorphic legs IV in fights for the ...
DOI:
10.1007/s00265-010-1103-0

2. Body size and sexual selection in the koala

Author:
William A. H. Ellis; Fred B. Bercovitch
Source:
Behavioral ecology and sociobiology 2011 v.65 no.6 pp. 1229-1235
ISSN:
0340-5443
Subject:
body size; dimorphism; females; males; microsatellite repeats; reproductive performance; sexual selection; sires
Abstract:
... Sexual selection is often characterized by polygynous breeding systems, size dimorphism, and skewed operational sex ratios. Koalas are sexually dimorphic in multiple domains, yet are absent from the literature on sexual selection and the structure of their mating system is unclear. We provide the first documentation of the strength of sexual selection in koalas by using microsatellite markers to i ...
DOI:
10.1007/s00265-010-1136-4

3. Daring females, devoted males, and reversed sexual size dimorphism in the sand-dwelling spider Allocosa brasiliensis (Araneae, Lycosidae)

Author:
Aisenberg, Anita; Viera, Carmen; Costa, Fernando G.
Source:
Behavioral ecology and sociobiology 2007 v.62 no.1 pp. 29-35
ISSN:
0340-5443
Subject:
Lycosidae; burrows; copulation; courtship; dimorphism; dunes; females; habitats; males; predation; progeny; sexual selection
Abstract:
... Sexual selection theory predicts that a higher investment in offspring will turn females into the selective sex, while males will compete for accessing and courting them. However, there are exceptions to the rule. When males present a high reproductive investment, sex roles can reverse from typical patterns, turning males into the choosy sex, while females locate males and initiate courtship. In m ...
DOI:
10.1007/s00265-007-0435-x

4. Dynamic signalling using cosmetics may explain the reversed sexual dichromatism in the monogamous greater flamingo

Author:
Juan A. Amat; Araceli Garrido; Francesca Portavia; Manuel Rendón-Martos; Antonio Pérez-Gálvez; Juan Garrido-Fernández; Jesús Gómez; Arnaud Béchet; Miguel A. Rendón
Source:
Behavioral ecology and sociobiology 2018 v.72 no.8 pp. 135
ISSN:
0340-5443
Subject:
Phoenicopterus roseus; chicks; theoretical models; fecundity; males; carotenoids; mating competitiveness; mating systems; feathers; females; monogamy; dimorphism; progeny; antioxidant activity; viability; breeding; color; polyandry; cosmetics; mating behavior
Abstract:
... Colourful plumage is typical of males in species with conventional sex roles, in which females care for offspring and males compete for females, as well as in many monogamous species in which both sexes care for offspring. Reversed sexual dichromatism—more colourful females than males—is predominant in species with sex role reversal. In the latter species, males care for offspring and females comp ...
DOI:
10.1007/s00265-018-2551-1

5. Egg size and laying order in relation to offspring sex in the extreme sexually size dimorphic brown songlark, Cinclorhamphus cruralis

Author:
Michael J. L. Magrath; Lyanne Brouwer; Jan Komdeur
Source:
Behavioral ecology and sociobiology 2003 v.54 no.3 pp. 240-248
ISSN:
0340-5443
Subject:
daughters; prediction; dimorphism; mothers; polygyny; starvation; brothers; eggs; sex ratio; food availability; hatching; nutrient reserves; chicks; females; nestlings
Abstract:
... In some bird species, mothers can advantage the offspring of one sex either by elevating them in the laying order to promote earlier hatching or by allocating greater resources to eggs of the preferred sex. In size dimorphic species, the predictions as to which sex should benefit most from such pre-laying adjustments are ambiguous. The smaller sex would benefit from an initial size advantage to he ...
DOI:
10.1007/s00265-003-0627-y

6. Evolution of mating systems and sexual size dimorphism in North American cyprinids

Author:
M. Pyron; T. E. Pitcher; S. J. Jacquemin
Source:
Behavioral ecology and sociobiology 2013 v.67 no.5 pp. 747-756
ISSN:
0340-5443
Subject:
Cyprinidae; body size; dimorphism; females; fish; males; mating systems; models; phylogeny; spawning; sperm competition; testes
Abstract:
... Mating systems evolve with sexual size dimorphism (SSD) in many animals. Mating systems with males larger than females occur when males compete for female access or guard territories, while mating systems with group mating tend to occur in species where females are the same size or larger than males. In addition to variation in SSD with mating system, sperm competition varies among mating systems ...
DOI:
10.1007/s00265-013-1498-5

7. Factors influencing sexual cannibalism and its benefit to fecundity and offspring survival in the wolf spider Pardosa pseudoannulata (Araneae: Lycosidae)

Author:
Lingbing Wu; Huaping Zhang; Ting He; Zeliang Liu; Yu Peng
Source:
Behavioral ecology and sociobiology 2013 v.67 no.2 pp. 205-212
ISSN:
0340-5443
Subject:
Pardosa; cannibalism; copulation; dimorphism; eggs; fecundity; hunger; males; progeny; virgin females; China
Abstract:
... Sexual cannibalism is hypothesized to have evolved as a way to obtain a high-quality meal, as an extreme mate choice or as a consequence of female aggressive spillover. Here, we examined underlying factors likely to influence sexual cannibalism in the wolf spider Pardosa pseudoannulata (Bösenberg & Strand, 1906) from China, including mating status, female egg-laid status, female hunger level, fema ...
DOI:
10.1007/s00265-012-1440-2

8. Fitness consequences of sexual cannibalism in female Argiope bruennichi

Author:
Lutz Fromhage; Gabriele Uhl; Jutta M. Schneider
Source:
Behavioral ecology and sociobiology 2003 v.55 no.1 pp. 60-64
ISSN:
0340-5443
Subject:
Argiope bruennichi; aggression; cannibalism; clutch size; copulation; dimorphism; evolution; fecundity; females; foraging; hatching; males; models; nutritive value
Abstract:
... The evolution of sexual cannibalism as the most extreme form of nuptial feeding is still poorly understood. Although increasing evidence suggests that female aggressiveness is related to other aspects of foraging behaviour, it is not clear whether the nutritional value of a male is sufficient to provide an adaptive significance for sexual cannibalism. A widely cited though rarely tested explanatio ...
DOI:
10.1007/s00265-003-0656-6

9. Intersexual conflict influences female reproductive success in a female-dispersing primate

Author:
Marie L. Manguette; Andrew M. Robbins; Thomas Breuer; Emma J. Stokes; Richard J. Parnell; Martha M. Robbins
Source:
Behavioral ecology and sociobiology 2019 v.73 no.9 pp. 118
ISSN:
0340-5443
Subject:
Gorilla; breeding; dimorphism; females; infant mortality; infants; males; mammals; mating behavior; progeny; reproductive success; risk
Abstract:
... In group-living mammals, individual efforts to maximize reproductive success result in conflicts and compromises between the sexes. Females utilize counterstrategies to minimize the costs of sexual coercion by males, but few studies have examined the effect of such behaviors on female reproductive success. Secondary dispersal by females is rare among group-living mammals, but in western gorillas, ...
DOI:
10.1007/s00265-019-2727-3

10. Intra-sexual variability in feeding behaviour of a mountain ungulate: size matters

Author:
Francesca Brivio; Stefano Grignolio; Alice Brambilla; Marco Apollonio
Source:
Behavioral ecology and sociobiology 2014 v.68 no.10 pp. 1649-1660
ISSN:
0340-5443
Subject:
Capra ibex; antipredatory behavior; biomass; case studies; dimorphism; energy intake; forage quality; foraging; herbivores; males; mastication; predation; risk; ungulates; vegetation
Abstract:
... Many studies comparing the behaviour of individuals of different genders or species showed that animal body mass and forage quality/quantity are key elements of the foraging ecology of herbivores. Since body mass could also influence the animal’s sensitivity to predation risk, its vigilance behaviour should consequently be affected. Alpine ibex (Capra ibex) is characterised by a strong dimorphism ...
DOI:
10.1007/s00265-014-1773-0

11. Males are faster foragers than females: intersexual differences of foraging behaviour in the Apennine chamois

Author:
Francesco Ferretti; Alessia Costa; Marcello Corazza; Venusta Pietrocini; Gloria Cesaretti; Sandro Lovari
Source:
Behavioral ecology and sociobiology 2014 v.68 no.8 pp. 1335-1344
ISSN:
0340-5443
Subject:
food intake; dimorphism; energy; autumn; males; chamois; herbivores; warm season; vegetation; food availability; progeny; food choices; foraging; habitats; females; breeding season
Abstract:
... Availability of food resources and individual characteristics can influence foraging behaviour, which can differ between males and females, leading to different patterns of food/habitat selection. In dimorphic species, females are usually more selective in food choice, show greater bite rates and spend more time foraging than males. We evaluated sexual differences in foraging behaviour in Apennine ...
DOI:
10.1007/s00265-014-1744-5

12. Parental care and sexual size dimorphism in wasps and bees

Author:
Gavin Shreeves; Jeremy Field
Source:
Behavioral ecology and sociobiology 2008 v.62 no.5 pp. 843-852
ISSN:
0340-5443
Subject:
Apoidea; birds; body size; dimorphism; eggs; exoskeleton; fecundity; females; invertebrates; males; mammals; nests; parental role; phylogeny; pollen
Abstract:
... Sexual size dimorphism, in which one sex is larger than the other, occurs when body size has differential effects on the fitness of males and females. Mammals and birds usually have male-biased size dimorphism, probably because of strong sexual competition among males. Invertebrates usually have female-biased size dimorphism, perhaps because their inflexible exoskeletons limit ovary size, leading ...
DOI:
10.1007/s00265-007-0510-3

13. Polyandrous mating in treetops: how male competition and female choice interact to determine an unusual carnivore mating system

Author:
Mia-Lana Lührs; Peter M. Kappeler
Source:
Behavioral ecology and sociobiology 2014 v.68 no.6 pp. 879-889
ISSN:
0340-5443
Subject:
carnivores; dimorphism; females; global positioning systems; males; mating behavior; mating systems; polyandry; testes; tree crown; trees
Abstract:
... The diversity of mammalian mating systems is primarily shaped by sex-specific reproductive strategies. In the present study, we explored determinants and consequences of a unique mating system exhibited by fossas (Cryptoprocta ferox), the largest Malagasy carnivore, where females mate polyandrously on traditional mating trees, and males exhibit intrasexual size dimorphism. Males face both contest ...
DOI:
10.1007/s00265-014-1701-3

14. Provisional rejection of three alternative hypotheses on the maintenance of a size dichotomy in males of Dawson's burrowing bee, Amegilla dawsoni (Apidae, Apinae, Anthophorini)

Author:
Alcock, J.
Source:
Behavioral ecology and sociobiology 1996 v.39 no.3 pp. 181-188
ISSN:
0340-5443
Subject:
Anthophora; dimorphism; brood rearing; males; body size
DOI:
10.1007/s002650050279

15. Reproductive conflict in animal societies: hierarchy length increases with colony size in queenless ponerine ants

Author:
Thibaud Monnin; Francis L. W. Ratnieks; Carlos R. F. Brandão
Source:
Behavioral ecology and sociobiology 2003 v.54 no.1 pp. 71-79
ISSN:
0340-5443
Subject:
Dinoponera; alloparental behavior; dimorphism; females; models; prediction; probability; reproduction; reproductives; vertebrates
Abstract:
... Dominance interactions determine reproductive status in many animal societies, including many cooperatively breeding vertebrates and eusocial Hymenoptera without queen-worker dimorphism. Typically, the dominant individual monopolises reproduction, and subordinates behave like helpers. In Dinoponera queenless ants, workers are totipotent females and can potentially reproduce, yet only the top-ranki ...
DOI:
10.1007/s00265-003-0600-9

16. Sex allocation in a monomorphic seabird with a single-egg clutch: test of the environment, mate quality, and female condition hypotheses

Author:
Addison, BriAnne; Kitaysky, Alexander S.; Hipfner, J. Mark
Source:
Behavioral ecology and sociobiology 2008 v.63 no.1 pp. 135-141
ISSN:
0340-5443
Subject:
Cerorhinca monocerata; body condition; breeding; corticosterone; daughters; dimorphism; environmental factors; females; hatching; males; mothers; rearing; seabirds; sex allocation; sons
Abstract:
... Sex allocation theory posits that mothers should preferentially invest in sons when environmental conditions are favorable for breeding, their mates are of high quality, or they are in good body condition. We tested these three hypotheses in rhinoceros auklets (Cerorhinca monocerata), monomorphic seabirds that lay a single-egg clutch, in 2 years that differed in environmental conditions for breedi ...
DOI:
10.1007/s00265-008-0643-z

17. Sex-biased parental care and sexual size dimorphism in a provisioning arthropod

Author:
Jeremy Field; Gavin Shreeves; Martyn Kennedy; Selina Brace; James D. J. Gilbert
Source:
Behavioral ecology and sociobiology 2015 v.69 no.12 pp. 1897-1906
ISSN:
0340-5443
Subject:
Hymenoptera; arthropods; burrows; correlation; dimorphism; fecundity; females; flight; males; mothers; nests; progeny; sexual selection; wings
Abstract:
... The diverse selection pressures driving the evolution of sexual size dimorphism (SSD) have long been debated. Whilst the balance between fecundity selection and sexual selection has received much attention, explanations based on sex-specific ecology have proven harder to test. In ectotherms, females are typically larger than males, and this is frequently thought to be because size constrains femal ...
DOI:
10.1007/s00265-015-2002-1

18. Sex-specific maternal effect on egg mass, laying order, and sibling competition in the Bengalese finch (Lonchura striata var. domestica)

Author:
Masayo Soma; Daichi S. Saito; Toshikazu Hasegawa; Kazuo Okanoya
Source:
Behavioral ecology and sociobiology 2007 v.61 no.11 pp. 1695-1705
ISSN:
0340-5443
Subject:
adults; body size; breeding; chicks; daughters; dimorphism; early development; eggs; females; gender differences; hatching; males; maternal effect; mothers; sons
Abstract:
... Maternal effects, such as investment in eggs, have profound effects on offspring fitness. Mothers are expected to skew their investment depending on the laying order and sex when unequal sibling competition occurs within a brood because of sex-specific vulnerability and age hierarchy caused by asynchronous hatching. The Bengalese finch hatches asynchronously and shows a moderate reversed sexual si ...
DOI:
10.1007/s00265-007-0400-8

19. Sexual size dimorphism in fallow deer (Dama dama): do larger, heavier males gain greater mating success?

Author:
Alan G. McElligott; Martin P. Gammell; Hilda C. Harty; Dean R. Paini; Desmond T. Murphy; James T. Walsh; Thomas J. Hayden
Source:
Behavioral ecology and sociobiology 2001 v.49 no.4 pp. 266-272
ISSN:
0340-5443
Subject:
Cervus dama; body size; bucks; dimorphism; sexual selection
Abstract:
... Sexual size dimorphism may evolve as a result of both natural and sexual selection. In polygynous mammals, the main factor resulting in the evolution of large body size in males is the advantage conferred during competition for mates. In this study, we examined whether sexual selection acts on body size in mature fallow bucks (Dama dama) by examining how the following traits are inter-related: age ...
DOI:
10.1007/s002650000293

20. When do looks matter? Effects of mate quality and environmental variability on lifetime reproduction

Author:
Z. R. Stahlschmidt; I. Chu; C. Koh
Source:
Behavioral ecology and sociobiology 2020 v.74 no.1 pp. 11
ISSN:
0340-5443
Subject:
Gryllus firmus; adulthood; biomass; decision making; dimorphism; egg production; eggs; females; food availability; heat; natural selection; progeny; reproductive performance; sociobiology; temperature
Abstract:
... Inter-individual variation in lifetime reproduction is the key target for natural selection, and it is influenced by many factors. Yet, we lack an understanding of how abiotic and biotic factors interact to influence lifetime reproductive output (number of offspring) and reproductive effort (total biomass invested into reproduction). Thus, we used a factorial design to manipulate variability in fo ...
DOI:
10.1007/s00265-019-2790-9

21. Why do hosts with obvious egg polymorphism suffer low parasitism rates under avian brood parasitism? A theoretical consideration

Author:
Canchao Yang; Wei Liang; Anders Pape Møller
Source:
Behavioral ecology and sociobiology 2017 v.71 no.1 pp. 30
ISSN:
0340-5443
Subject:
Cuculidae; birds; brood parasitism; dimorphism; eggs; frequency dependent selection; hosts; morphs; phenotype
Abstract:
... Polymorphism is a general phenomenon in the natural world evolving as a result of frequency-dependent selection. Such polymorphism has recently received increasing attention in parasitic cuckoo-host systems, in which egg polymorphism in hosts is regarded as a specific adaptation against cuckoo parasitism. Here, we provided a theoretical analysis to investigate the effect of host egg polymorphism o ...
DOI:
10.1007/s00265-016-2256-2

22. The development of sex differences in ring-tailed lemur feeding ecology

Author:
M. Teague O’Mara; Cathriona M. Hickey
Source:
Behavioral ecology and sociobiology 2014 v.68 no.8 pp. 1273-1286
ISSN:
0340-5443
Subject:
Lemur; adults; diet; dimorphism; ecology; foraging; gender differences; juveniles; lactating females; lactation; males; mammals; nutrient requirements; reproduction; weaning
Abstract:
... Sex differences in feeding ecology may develop in response to fluctuations in physiological costs to females over their reproductive cycles, or to sexual size dimorphism, or function to minimize feeding competition within a group via resource partitioning. For most mammal species, it is unknown how these factors contribute to sex differences in feeding, or how the development of males and females ...
DOI:
10.1007/s00265-014-1738-3

23. The evolution of ant worker polymorphism correlates with multiple social traits

Author:
Nathan Lecocq de Pletincx; Simon Dellicour; Serge Aron
Source:
Behavioral ecology and sociobiology 2021 v.75 no.8 pp. 113
ISSN:
0340-5443
Subject:
Cataglyphis; comparative study; dimorphism; genetic relationships; head; labor; larval development; phylogeny; sociobiology
Abstract:
... In eusocial insects, worker polymorphism is shaped by several factors, including colony size, queen mating frequency, and the timing of queen-worker differentiation during larval development. In a comparative study of 18 species of Cataglyphis desert ants representing a wide range of worker sizes, we used phylogenetically controlled analyses to examine correlations between worker head width variat ...
DOI:
10.1007/s00265-021-03049-6

24. The genetic mating system of a sea spider with male-biased sexual size dimorphism: evidence for paternity skew despite random mating success

Author:
Felipe S. Barreto; John C. Avise
Source:
Behavioral ecology and sociobiology 2011 v.65 no.8 pp. 1595-1604
ISSN:
0340-5443
Subject:
Araneae; Pycnogonida; arthropods; body size; breeding; dimorphism; males; natural history; paternity; quantitative analysis; random mating; sexual selection
Abstract:
... Male-biased size dimorphism is usually expected to evolve in taxa with intense male–male competition for mates, and it is hence associated with high variances in male mating success. Most species of pycnogonid sea spiders exhibit female-biased size dimorphism, and are notable among arthropods for having exclusive male parental care of embryos. Relatively little, however, is known about their natur ...
DOI:
10.1007/s00265-011-1170-x
PubMed:
21874083
PubMed Central:
PMC3134710

25. The role of male coloration and ornamentation in potential alternative mating strategies of the dimorphic jumping spider, Maevia inclemens

Author:
Laurel B. Lietzenmayer; David L. Clark; Lisa A. Taylor
Source:
Behavioral ecology and sociobiology 2019 v.73 no.6 pp. 83
ISSN:
0340-5443
Subject:
Salticidae; aggression; antipredatory behavior; aposematic species; body size; cannibalism; color; courtship; dimorphism; females; head; legs; males; morphs; predation; reproductive success; risk; sexual selection; vertebrates
Abstract:
... Polymorphism can arise across taxa due to various selection pressures and potentially lead to alternative mating or antipredator strategies. For male jumping spiders, sexual selection and predation risk are often intertwined when courting cannibalistic females and may be a driving factor in the polymorphism of the jumping spider, Maevia inclemens. The dimorphic males of M. inclemens differ dramati ...
DOI:
10.1007/s00265-019-2691-y