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

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

scholarly journals Evolution of reduced pre-adult viability and larval growth rate in laboratory populations of Drosophila melanogaster selected for shorter development time

2000 ◽  
Vol 76 (3) ◽  
pp. 249-259 ◽  
Author(s):  
N. G. PRASAD ◽  
MALLIKARJUN SHAKARAD ◽  
VISHAL M. GOHIL ◽  
V. SHEEBA ◽  
M. RAJAMANI ◽  
...  
Keyword(s):  
Growth Rate ◽  
Drosophila Melanogaster ◽  
Development Time ◽  
Larval Growth ◽  
Dry Weight ◽  
Relative Reduction ◽  
Larval Growth Rate ◽  
Laboratory Populations ◽  
The Difference ◽  
Faster Development

Four large (n > 1000) populations of Drosophila melanogaster, derived from control populations maintained on a 3 week discrete generation cycle, were subjected to selection for fast development and early reproduction. Egg to eclosion survivorship and development time and dry weight at eclosion were monitored every 10 generations. Over 70 generations of selection, development time in the selected populations decreased by approximately 36 h relative to controls, a 20% decline. The difference in male and female development time was also reduced in the selected populations. Flies from the selected populations were increasingly lighter at eclosion than controls, with the reduction in dry weight at eclosion over 70 generations of selection being approximately 45% in males and 39% in females. Larval growth rate (dry weight at eclosion/development time) was also reduced in the selected lines over 70 generations, relative to controls, by approximately 32% in males and 24% in females. However, part of this relative reduction was due to an increase in growth rate of the controls populations, presumably an expression of adaptation to conditions in our laboratory. After 50 generations of selection had elapsed, a considerable and increasing pre- adult viability cost to faster development became apparent, with viability in the selected populations being about 22% less than that of controls at generation 70 of selection.

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 Sex Biased Mortality in Scaphiopus (Pelobatidae)

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

Export Citation Format

Share Document