A model of mate guarding

Grafen, Alan; Ridley, Mark

doi:10.1016/0022-5193(83)90390-9

Cited by 165 publications

(134 citation statements)

References 19 publications

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“…Furthermore, amphipods carry their broods, extending their reproductive cycle beyond spawning. In these species, the onset of molting is delayed until hatching and release of their juveniles [27,28]. Coordination of the molting of the rigid exoskeleton with the ovarian cycle also facilitates the movement of the newly ovulated oocytes through the oviducts into the marsupium, while the new exoskeleton is still flexible enough to allow their passage [29].…”

Section: Molt Cyclementioning

confidence: 99%

“…Precopulatory mate-guarding behavior (amplexus) is thought to have evolved in free-roaming epibenthic amphipods as a male competitive strategy in response to the brief period of female receptivity [27]. Gammarid amphipod females typically produce several broods in succession during the warmer months in the temperate zone.…”

Section: Reproductive Behaviors Of Amphipods During Matingmentioning

confidence: 99%

“…Generally, amplexus begins toward the end of the female intermolt period and continues until the female molts. After her molt, a new marsupial brood chamber is formed under her ventral surface, and copulation occurs within minutes afterward, with the male injecting spermatozoa into the newly formed marsupial chamber while it is still flexible before it hardens together with the exoskeleton [27,48]. Then, within 1 h, ovulation occurs and subsequently fertilization is able to proceed externally in the marsupium [29].…”

Section: Reproductive Behaviors Of Amphipods During Matingmentioning

confidence: 99%

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Review of the reproductive biology of amphipods and their endocrine regulation: Identification of mechanistic pathways for reproductive toxicants

Hyne¹

2011

Enviro Toxic and Chemistry

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Abstract-The reproductive biology of amphipods is reviewed to update the knowledge of the male and female reproductive processes of oogenesis and spermatogenesis as well as the endocrine systems of amphipods with the aim of advancing studies of reproductive toxicology. The ovarian and reproduction cycles of female gammaridean amphipods are closely correlated with the molt cycle, which is under direct control by the steroid hormone 20-hydroxyecdysone. The ability of males to copulate and subsequently for females to ovulate is restricted to the early postmolt period of the females. New developments in our understanding of the molt cycle and the endocrine regulatory pathways for reproduction using genomics techniques on other crustacean species are also discussed. The arthropod sterol ponasterone A or xenobiotics such as the fungicide fenarimol have been shown to elicit endocrine disruption in some crustaceans by acting as an agonist for 20-hydroxyecdysone at the ecdysone receptor or by inhibiting the synthesis of 20-hydroxyecdysone, respectively, resulting in disruption of molting and reproduction. Recent studies suggest that cadmium can inhibit secondary vitellogenesis in amphipods. Experimental approaches for examining the metabolic pathways associated with ecdysteroid hormonal signaling or metabolism, exoskeleton maintenance and molting, and the regulation of vitellogenin in amphipods are discussed. This information should aid in the identification of useful biomarkers for reproductive toxicity. Environ. Toxicol. Chem.

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Section: Molt Cyclementioning

confidence: 99%

Section: Reproductive Behaviors Of Amphipods During Matingmentioning

confidence: 99%

Section: Reproductive Behaviors Of Amphipods During Matingmentioning

confidence: 99%

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Review of the reproductive biology of amphipods and their endocrine regulation: Identification of mechanistic pathways for reproductive toxicants

Hyne¹

2011

Enviro Toxic and Chemistry

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“…< > denotes uncertain outcome Table S. Probable outcomes of male competitive encounters opportunity to mate with others) of this strategy in terms ofmale time investment (Parker 1974;Grafen and Ridley 1983), while ignoring possible benefits and costs to females being guarded (Christy 1987). Mate competition experiments demonstrated that females are particularly susceptible to injury and mortality during the reproductive stage.…”

Section: Discussionmentioning

confidence: 99%

“…When one sex becomes limiting, either temporally or spatially, competition for mates should intensify (Emlen and Oring 1977;Ims 1988). Under such circumstances, theory predicts individuals of the more common sex will search for and guard members of the limiting sex (Parker 1974;Grafen and Ridley 1983). In both cancrid (e.g., Cancer magister) and portunid (e.g., Callinectes sapidus) crab mating systems, females can copulate only during a brief timespan immediately following their molt (Gleeson 1980;Christy 1987).…”

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confidence: 99%

The impact of limb autotomy on mate competition in blue crabs Callinectes sapidus Rathbun

Smith

1992

Oecologia

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Summary. This study is the first to demonstrate experimentally that autotomy (self-amputation of a body part) adversely affects competition for mates. Experiments were conducted using blue crabs Callinectes sapidus Rathbun to examine the consequences of limb loss and pairing precedence on mate acquisition by males. Two adult males of equivalent size were introduced sequentially into pools containing a sexually-receptive female and observed after 24 hand 48 h. One male in each pair was left intact, while the other experienced: (I) no autotomy, (2) autotomy of one cheliped, or (3) autotomy of both chelipeds, one walking leg, and one swimming leg. In the absence ofa competitor (first 24 h), both intact and injured males established precopulatory embraces with females. Intact males were highly successful (84-95% ) in defending females from intact or injured intruders in the second 24 h period. Both autotomy treatments, however, significantly reduced the ability of males to defend females from intact intruders. Females in experiments suffered greater frequency of limb loss than did males. In the field, paired blue crabs showed significantly higher incidence of limb loss than unpaired crabs. Limb loss frequency increases with body size, and field observations indicated that larger males may be more successful than smaller males in obtaining females. Both experimental manipulations and field studies provide strong evidence for mate competition in this ecologically and commercially important portunid species.

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Do females invest more into eggs when males sing more attractively? Postmating sexual selection strategies in a monogamous reed passerine

Krištofík

Darolová

Majtán

et al. 2014

Ecology and Evolution

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Maternal investment can play an important role for offspring fitness, especially in birds, as females have to provide their eggs with all the necessary nutrients for the development of the embryo. It is known that this type of maternal investment can be influenced by the quality of the male partner. In this study, we first verify that male song is important in the mate choice of female Eurasian reed warblers, as males mate faster when their singing is more complex. Furthermore, female egg investment varies in relation to male song characteristics. Interestingly, clutch size, egg weight, or size, which can be considered as an high-cost investment, is not influenced by male song characteristics, whereas comparably low-cost investment types like investment into diverse egg components are adjusted to male song characteristics. In line with this, our results suggest that female allocation rules depend on investment type as well as song characteristics. For example, egg white lysozyme is positively correlated with male song complexity. In contrast, a negative correlation exists between-song speed and syllable repetitiveness and egg yolk weight as well as egg yolk testosterone concentration. Thus, our results suggest that female egg investment is related to male song performance in several aspects, but female investment patterns regarding various egg compounds are not simply correlated.

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A model of mate guarding

Cited by 165 publications

References 19 publications

Review of the reproductive biology of amphipods and their endocrine regulation: Identification of mechanistic pathways for reproductive toxicants

Review of the reproductive biology of amphipods and their endocrine regulation: Identification of mechanistic pathways for reproductive toxicants

The impact of limb autotomy on mate competition in blue crabs Callinectes sapidus Rathbun

Do females invest more into eggs when males sing more attractively? Postmating sexual selection strategies in a monogamous reed passerine

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