Effects of sex ratio on intra- and inter-sexual behaviour in sand gobies

Kvarnemo, Charlotta; Forsgren, Elisabet; Magnhagen, Carin

doi:10.1016/0003-3472(95)80002-6

Cited by 111 publications

(86 citation statements)

References 28 publications

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“…Kvarnemo et al 1995;Forsgren et al 2004). The present study has provided evidence of some of the effects of sex ratio variation on the reproductive behaviour of S. abaster males and females.…”

Section: Discussionmentioning

confidence: 99%

“…One possible explanation for this observation might lie in the fact that intrasexual interactions may also serve as a cue for mate choice. Animals obtain information and guide their choice between potential partners from observing competitive interactions and displays between them, just as well as from displays directed towards the choosing individual (Kvarnemo et al 1995;Berglund & Rosenqvist 2001). In S. typhle, for example, males preferred dominant over attractive females, remembering information from competitive displays and using it, rather than immediate information from displays (Berglund & Rosenqvist 2001).…”

Section: Discussionmentioning

confidence: 99%

“…As a result, the intensity of mating competition (e.g. spider mite, Tetranychus urticae: Enders 1993; field cricket, Gryllus pennsylvanicus: Souroukis & Cade 1993; Japanese medaka, Oryzias latipes: Grant 1995; sand goby, Pomatoschistus minutus: Kvarnemo et al 1995) or sex roles (Almada et al 1995) can change. Gwynne & Simmons (1990) showed, in katydids, that when high-quality food is abundant, males produce spermatophores more rapidly than females produce eggs, thus biasing the OSR towards males and leading to male-male competition.…”

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confidence: 99%

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Reversing sex role reversal: compete only when you must

Silva¹,

Vieira²,

Almada³

et al. 2010

Animal Behaviour

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Keywords:black striped pipefish competition female-female-interaction mating tactics operational sex ratio (OSR) sex role reversal Syngnathidae Syngnathus abasterThe operational sex ratio (OSR) is thought to be a major factor influencing the intensity of mating competition and sexual selection. Even though many studies on species with conventional sex roles have shown that alterations in the OSR can either intensify male-male competition or promote female-female competitive interactions, sometimes resulting in a reversal of sex roles, it is not known how, and how quickly, individuals with reversed sex roles respond to fluctuations in this ratio. We tested for a direct influence of adult sex ratios (as a direct estimation of the OSR) on the reproductive behaviour of the sex role-reversed black striped pipefish, Syngnathus abaster. Although imbalances in the OSR effectively modulated the expression of sex roles, with males and females varying in the degree of choosiness and competitive displays, alterations in the sex ratios did not promote a similar response pattern in both sexes. A surplus of males resulted in a reversion to conventional sex roles observed when both sexes coexist in similar numbers, with males competing intensely and exhibiting a conspicuous ornament towards other males. An excess of females, in contrast, did not result in an overall increase in female competitive interactions. Only small, less attractive, females were more prone to compete as the proportion of males decreased. Large females, however, seemed to rely on their greater mating prospects, thereby avoiding the hypothetical costs of intrasexual competition. Ó

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Reversing sex role reversal: compete only when you must

Silva¹,

Vieira²,

Almada³

et al. 2010

Animal Behaviour

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“…Important factors that have been implied in mate choice in fish involve differences between the sexes in reproductive rate (Clutton-Brock & Vincent, 1991;Clutton-Brock & Parker, 1992), the operational sex ratio (Emlen & Oring, 1977;Kvarnemo et al, 1995), and variation in mate quality (e.g. parental skills, Forsgren, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that in the sand goby Pomatoschistus minutus (Pallas) experimental manipulation of the sex-ratio may affect strongly patterns of interactions among members of each sex, leading to a change from predominantly male to predominantly female competition, as the sex-ratio changes from a male biased to a female biased condition (Kvarnemo et al, 1995).…”

mentioning

confidence: 99%

Temporal variation in male traits, nesting aggregations and mating success in the peacock blenny

Oliveira¹

1999

Journal of Fish Biology

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At the beginning of the breeding season male Salaria pavo that have eggs in their nests are larger, have more developed anal glands and less intense eye-spots and are located in breeding aggregations. These differences cease to occur from the peak of the breeding season (June-July) onwards. Two scenarios are presented that may explain these results: (1) smaller and younger males may begin to breed later devoting part of the warm season to growth; (2) females may cease to be selective as the nesting space begins to be saturated with eggs. These results raise one methodological and one conceptual question. The search for correlates of male reproductive success must cover different phases of the breeding season to capture the overall dynamics of the processes involved. The operational sex ratio for cavity-spawning fishes should take into account the availability of spawning sites rather than just counting the sexually mature members of each sex. 1999 The Fisheries Society of the British Isles

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2018

Fishes in Lagoons and Estuaries in the Mediterranean 1

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Effects of sex ratio on intra- and inter-sexual behaviour in sand gobies

Cited by 111 publications

References 28 publications

Reversing sex role reversal: compete only when you must

Reversing sex role reversal: compete only when you must

Temporal variation in male traits, nesting aggregations and mating success in the peacock blenny

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