Geographic intra-specific variation in social organization is driven by population density

Schradin, Carsten; Drouard, Florian; Lemonnier, Gildas; Askew, R. R.; Olivier, Charlotte Anaïs; Pillay, Neville

doi:10.1007/s00265-020-02896-z

Cited by 12 publications

(12 citation statements)

References 49 publications

(95 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, in striped mice ( Rhabdomys pumilio ), another rodent species from southern Africa, intraspecific variation in their social system is impacted by both resources and population density. Mice tend to remain solitary in populations with greater rainfall and in years when population density is low but form groups in areas of lower rainfall or when population density is high (Schradin et al, 2010 ; Schradin et al, 2020 ; Schradin & Pillay, 2005 ). We found differences in density between sites with more adults per hectare in our high resource site but little variability from year to year within sites.…”

Section: Discussionmentioning

confidence: 99%

Intraspecific variation in male mating strategies in an African ground squirrel (Xerus inauris)

Manjerovic

Hoffman

Parkinson

et al. 2022

Ecology and Evolution

View full text Add to dashboard Cite

Male mating strategies respond to female availability such that variation in resources that affect spatial distribution can also alter cost–benefit tradeoffs within a population. In arid‐adapted species, rainfall alters reproduction, behavior, morphology, and population density such that populations differing in resource availability may also differ in successful reproductive strategies. Here, we compare two populations of Cape ground squirrels ( Xerus inauris ), a sub‐Saharan species with year‐round breeding and intense mating competition. Unlike most mammals where males resort to aggressive interactions over females, male X. inauris are tolerant of one another, relying instead on other nonaggressive pre‐ and postcopulatory strategies to determine reproductive success. Our findings suggest that differences in resource availability affect female distribution, which ultimately leads to intraspecific variation in male reproductive tactics and sexual morphology. Sperm competition, assessed by reproductive morphometrics, was more pronounced in our high resource site where females were distributed evenly across the landscape, whereas dominance seemed to be an important determinant of success in our low resource site where females were more aggregated. Both sites had similar mating intensities, and most males did not sire any offspring. However, our low resource site had a higher variance in fertilization success with fewer males siring multiple offspring compared with our high resource site where more individuals were successful. Our results lend support to resource models where variations in female spatial distribution attributed to environmental resources ultimately impact male reproductive behaviors and morphology.

show abstract

Section: Discussionmentioning

confidence: 99%

Intraspecific variation in male mating strategies in an African ground squirrel (Xerus inauris)

Manjerovic

Hoffman

Parkinson

et al. 2022

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…In several Orders, including primates and ungulates, plural breeding appears to have evolved from solitary breeding or pair-breeding ancestors (23,24,26), often in association with the production of single, relatively precocial young (73). In some species, populations oscillate between singular breeding when density is low and plural breeding when it is high while, in others, females continue either to occupy separate ranges or to live in groups at all densities although territory size often declines when density is high (114,115).…”

Section: Female Sociality In Plural Breedersmentioning

confidence: 99%

“…Groups of breeding females vary widely in size ranging from small, stable groups that frequently defend feeding territories and usually include no more than two or three breeding females to the unstable herds of migratory deer and antelope that can include several thousand individuals (7,23,116) and the colonies of some bats that can have more than a million members (116). Group size also varies widely both within and between populations and commonly increases with population density (114,115,117).…”

Section: Female Sociality In Plural Breedersmentioning

confidence: 99%

Social evolution in mammals

Clutton‐Brock

2021

Science

View full text Add to dashboard Cite

show abstract

“…Population density (PD). Population density is one of the most important factors affecting industrial structure transformation [81,82]. When the population of a region is dense, the labor supply becomes sufficient, and the market potential is large, which can greatly promote the transformation of the industrial structure.…”

Section: Control Variablesmentioning

confidence: 99%

Environmental Regulation, Technological Innovation, and Industrial Transformation: An Empirical Study Based on City Function in China

Dong

Liu

et al. 2021

Sustainability

View full text Add to dashboard Cite

The Chinese economy has now transitioned from rapid expansion to high-quality growth. The issue of achieving synergy between environmental conservation and economic growth has become a serious concern. Based on the panel data of 120 prefecture-level cities in China from 2008 to 2017, we used the panel threshold regression model to investigate the influences of environmental regulation (ER) and technological innovation (TI) on urban industrial transformation. Further, we examined the threshold characteristics of four types of functional cities—resource-based, industry-oriented, comprehensive regional, and other types of cities. Our results show that ER and TI have varied effects on the industrial transformation of the four categories of functional cities. Both ER and TI have significant nonlinear threshold impacts on industrial transformation in resource-based cities. The inhibitory effect of ER on industrial structure rationalization decreases as the severity of ER increases. There is a shift from the promotion to the restriction of industrial structure rationalization due to TI increase. In contrast, TI strengthens the optimization of industrial structure. The promotion effects of ER and TI on industrial structure optimization improve as the former and latter increase in comprehensive regional cities. The influence of TI on the industrial transformation of industry-oriented cities is consistent with its impact on resource-based cities. These findings provide theoretical guidance and inspiration for urban industrial transformation in response to ER and TI based on their functional roles.

show abstract

Geographic intra-specific variation in social organization is driven by population density

Cited by 12 publications

References 49 publications

Intraspecific variation in male mating strategies in an African ground squirrel (Xerus inauris)

Intraspecific variation in male mating strategies in an African ground squirrel (Xerus inauris)

Social evolution in mammals

Environmental Regulation, Technological Innovation, and Industrial Transformation: An Empirical Study Based on City Function in China

Contact Info

Product

Resources

About