Operational Sex Ratios and Sex Biased Mortality in Scaphiopus (Pelobatidae)

1984 ◽  
Vol 29 (2) ◽  
pp. 232 ◽  
Author(s):  
Bruce Woodward
Keyword(s):  
Sex Ratios ◽  
Operational Sex Ratios

scholarly journals The Perception of Operational Sex Ratios by Voice

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
John G. Neuhoff
Keyword(s):  
Sex Ratios ◽  
Operational Sex Ratios

Operational sex ratios and behavioural sex differences in a pipefish population

1994 ◽  
Vol 34 (6) ◽  
pp. 142-435 ◽  
Author(s):  
Amanda Vincent ◽  
Ingrid Ahnesj� ◽  
Anders Berglund
Keyword(s):  
Sex Differences ◽  
Sex Ratios ◽  
Operational Sex Ratios ◽  
Behavioural Sex Differences

Divergence of responses to variable socio‐sexual environments in laboratory populations of Drosophila melanogaster evolving under altered operational sex ratios

Evolution ◽  
2020 ◽  
Author(s):  
Komal Maggu ◽  
Neetika Ahlawat ◽  
Manas Geeta Arun ◽  
Abhishek Meena ◽  
Nagaraj Guru Prasad
Keyword(s):  
Drosophila Melanogaster ◽  
Sex Ratios ◽  
Laboratory Populations ◽  
Operational Sex Ratios

Social Behavior and Operational Sex Ratios in the Viviparous Fish Girardinichthys multiradiatus

Copeia ◽  
1994 ◽  
Vol 1994 (4) ◽  
pp. 919 ◽  
Author(s):  
Constantino Macías Garcia ◽  
Constantino Macias Garcia
Keyword(s):  
Social Behavior ◽  
Sex Ratios ◽  
Viviparous Fish ◽  
Operational Sex Ratios

Reconstructed paternal genotypes reveal variable rates of multiple paternity at three rookeries of loggerhead sea turtles (Caretta caretta) in Western Australia

2014 ◽  
Vol 62 (6) ◽  
pp. 454 ◽  
Author(s):  
J. N. Tedeschi ◽  
N. J. Mitchell ◽  
O. Berry ◽  
S. Whiting ◽  
M. Meekan ◽  
...  
Keyword(s):  
Population Size ◽  
Western Australia ◽  
Sea Turtles ◽  
Sex Ratios ◽  
Multiple Paternity ◽  
Caretta Caretta ◽  
Loggerhead Sea Turtles ◽  
Female Population ◽  
Species Specific ◽  
Operational Sex Ratios

Female sea turtles are promiscuous, with clutches of eggs often sired by multiple males and rates of multiple paternity varying greatly within and across species. We investigated levels of multiple paternity in loggerhead sea turtles (Caretta caretta) from three rookeries in Western Australia by analysing polymorphic species-specific genetic markers. We predicted that the level of multiple paternity would be related to female population size and hence the large rookery at Dirk Hartog Island would have higher rates of multiple paternity than two smaller mainland rookeries at Gnaraloo Bay and Bungelup Beach. Contrary to our prediction, we found highly variable rates of multiple paternity among the rookeries that we sampled, which was unrelated to female population size (25% at Bungelup Beach, 86% at Gnaraloo Bay, and 36% at Dirk Hartog Island). Approximately 45 different males sired 25 clutches and the average number of sires per clutch ranged from 1.2 to 2.1, depending on the rookery sampled. The variance in rates of multiple paternity among rookeries suggests that operational sex ratios are variable in Western Australia. Periodic monitoring would show whether the observed patterns of multiple paternity for these three rookeries are stable over time, and our data provide a baseline for detecting shifts in operational sex ratios.

Operational sex ratios and mating competition

Sex Ratios ◽  
2002 ◽  
pp. 366-382 ◽  
Author(s):  
Charlotta Kvarnemo ◽  
Ingrid Ahnesjö
Keyword(s):  
Sex Ratios ◽  
Mating Competition ◽  
Operational Sex Ratios

scholarly journals Best in the company of nearby males: female success in the threatened cycad,Zamia portoricensis

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5252 ◽  
Author(s):  
Julio C. Lazcano-Lara ◽  
James D. Ackerman
Keyword(s):  
Spatial Distribution ◽  
Reproductive Success ◽  
Sex Ratios ◽  
Mate Finding ◽  
Plant Reproductive Success ◽  
Successful Recruitment ◽  
Males And Females ◽  
Plant Pollinator ◽  
Two Populations ◽  
Operational Sex Ratios

Variation in plant reproductive success is affected by ecological conditions including the proximity of potential mates. We address the hypothesis that spatial distribution of sexes affects female reproductive success (RS) in the dioecious cycad,Zamia portoricensis.Are the frequencies of males, operational sex ratios, and distances to the nearest mate associated with RS in females? We studied the spatial distribution of sexes in two populations in Puerto Rico and compared RS of target females with the number of males and operational sex ratios. Population structure suggests regular successful recruitment. Adults, males, and females were randomly distributed with respect to one another. Reproductive success of females was highly variable, but was higher in neighborhoods with more males than females and generally decreased with increasing distance to the nearest male, becoming statistically significant beyond 190 cm. This possible mate-finding Allee effect indicates that pollinator movement among plants may be limited for this mutually dependent plant-pollinator interaction. Yet being close to male plants is a matter of chance, perhaps a factor generating the high intra-population genetic diversity inZ. portoricensis.

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