scholarly journals Sex Allocation Patterns across Cooperatively Breeding Birds Do Not Support Predictions of the Repayment Hypothesis

2017 ◽  
Vol 190 (4) ◽  
pp. 547-556 ◽  
Author(s):  
Nyil Khwaja ◽  
Ben J. Hatchwell ◽  
Robert P. Freckleton ◽  
Jonathan P. Green
Keyword(s):  
Sex Allocation ◽  
Breeding Birds ◽  
Cooperatively Breeding ◽  
Allocation Patterns

Multi-Year Seasonal Sex-Allocation Patterns in Red-winged Blackbirds (Agelaius phoeniceus)

The Auk ◽  
2009 ◽  
Vol 126 (1) ◽  
pp. 181-185 ◽  
Author(s):  
Patrick J. Weatherhead
Keyword(s):  
Sex Allocation ◽  
Agelaius Phoeniceus ◽  
Allocation Patterns

Coupling Delayed Breeding with Short-distance Dispersal in Cooperatively Breeding Birds

Ethology ◽  
2010 ◽  
Vol 86 (4) ◽  
pp. 265-286 ◽  
Author(s):  
Steve Zack
Keyword(s):  
Short Distance ◽  
Breeding Birds ◽  
Cooperatively Breeding

scholarly journals The maleness of larger angiosperm flowers

2020 ◽  
Vol 117 (20) ◽  
pp. 10921-10926 ◽  
Author(s):  
Gustavo Brant Paterno ◽  
Carina Lima Silveira ◽  
Johannes Kollmann ◽  
Mark Westoby ◽  
Carlos Roberto Fonseca
Keyword(s):  
Sex Allocation ◽  
Seed Set ◽  
Limited Resource ◽  
Male And Female ◽  
Allocation Patterns ◽  
Biomass Components ◽  
Flower Evolution ◽  
Primary Male ◽  
Shed Light ◽  
Allocation Strategies

Flower biomass varies widely across the angiosperms. Each plant species invests a given amount of biomass to construct its sex organs. A comparative understanding of how this limited resource is partitioned among primary (male and female structures) and secondary (petals and sepals) sexual organs on hermaphrodite species can shed light on general evolutionary processes behind flower evolution. Here, we use allometries relating different flower biomass components across species to test the existence of broad allocation patterns across the angiosperms. Based on a global dataset with flower biomass spanning five orders of magnitude, we show that heavier angiosperm flowers tend to be male-biased and invest strongly in petals to promote pollen export, while lighter flowers tend to be female-biased and invest more in sepals to insure their own seed set. This result demonstrates that larger flowers are not simple carbon copies of small ones, indicating that sexual selection via male–male competition is an important driver of flower biomass evolution and sex allocation strategies across angiosperms.

Latitudinal variation in the sociality of allodapine bees (Hymenoptera: Apidae): sex ratios, relatedness and reproductive differentiation

2001 ◽  
Vol 49 (1) ◽  
pp. 1 ◽  
Author(s):  
Adam L. Cronin ◽  
Michael P. Schwarz
Keyword(s):  
Sex Allocation ◽  
Sympatric Species ◽  
Egg Laying ◽  
Reproductive Skew ◽  
Brood Development ◽  
Eastern Australia ◽  
Reproductive Differentiation ◽  
Allocation Patterns ◽  
One Year ◽  
Latitudinal Range

Variation in sociality of two Australian allodapine bees was investigated over a latitudinal range of 10˚, spanning subtropical to cool temperate forests in eastern Australia. Exoneura robusta is univoltine and singly brooded in southern populations but is able to produce two broods per season in northern populations, leading to opportunities for sib rearing by older brood members. In contrast, sympatric colonies of E. angophorae show no such variation with latitude, and all populations exhibit some colonies where opportunities for sib rearing arise. Patterns of ovarian differentiation, relatedness and sex allocation were examined over a one-year period for these two sympatric species in four populations. Within each species, the timing of ovarian development and the degree of reproductive skew were similar at all sites, but the onset of egg-laying and brood development was earlier in E. angophorae than in E. robusta. Relatedness and sex allocation patterns in northern populations of these species were not markedly different from southern populations. Selection for female-biased sex allocation and high reproductive skew in Exoneura probably stems from strong benefits from cooperative nesting, and our results suggest that opportunities for sib rearing (and eusociality) in these species may depend on latitudinally mediated brood development rates, and are unrelated to levels of sex bias and relatedness.

How cooperatively breeding birds identify relatives and avoid incest: New insights into dispersal and kin recognition

BioEssays ◽  
2015 ◽  
Vol 37 (12) ◽  
pp. 1303-1308 ◽  
Author(s):  
Christina Riehl ◽  
Caitlin A. Stern
Keyword(s):  
Kin Recognition ◽  
Breeding Birds ◽  
Cooperatively Breeding

scholarly journals Sex allocation and the emergence of helping in cooperatively breeding species

2015 ◽  
Vol 104 ◽  
pp. 1-9
Author(s):  
Josh D. Dunn ◽  
Teodora Vujicic ◽  
Geoff Wild
Keyword(s):  
Sex Allocation ◽  
Cooperatively Breeding

Snow skinks (Niveoscincus ocellatus) do not shift their sex allocation patterns in response to mating history

Behaviour ◽  
2009 ◽  
Vol 146 (10) ◽  
pp. 1405-1422 ◽  
Author(s):  
Erik Wapstra ◽  
Geoffrey While
Keyword(s):  
Sex Allocation ◽  
Mating History ◽  
Allocation Patterns

scholarly journals Individual and population sex allocation patterns

1987 ◽  
Vol 31 (1) ◽  
pp. 47-74 ◽  
Author(s):  
Steven A. Frank
Keyword(s):  
Sex Allocation ◽  
Allocation Patterns
Sign in / Sign up

Export Citation Format

Share Document