Interspecies and intraspecies interactions in social amoebae

The stable co‐existence of individuals of different genotypes and reproductive division of labour within heterogeneous groups are issues of fundamental interest from the viewpoint of evolution. Cellular slime moulds are convenient organisms in which to address both issues. Strains of a species co‐oc...

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Bibliographic Details
Published in:Journal of evolutionary biology 2014-02, Vol.27 (2), p.349-362
Main Authors: Sathe, S, Khetan, N, Nanjundiah, V
Format: Article
Language:English
Subjects:
Biological Evolution
chimaera
clones
cooperation
correlation
Dictyostelium
Dictyostelium - physiology
evolution
Evolutionary biology
fruiting bodies
genotype
Genotype & phenotype
guild
labor
microbial diversity
niche overlap
Protozoa
Reproduction
reproductive skew
reproductives
social behaviour
sorting out
Species Specificity
spores
variance
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Summary:The stable co‐existence of individuals of different genotypes and reproductive division of labour within heterogeneous groups are issues of fundamental interest from the viewpoint of evolution. Cellular slime moulds are convenient organisms in which to address both issues. Strains of a species co‐occur, as do different species; social groups are often genetically heterogeneous. Intra‐ and interspecies 1 : 1 mixes of wild isolates of Dictyostelium giganteum and D. purpureum form chimaeric aggregates, following which they segregate to varying extents. Intraspecies aggregates develop in concert and give rise to chimaeric fruiting bodies that usually contain more spores (reproductives) of one component than the other. Reproductive skew and variance in the proportion of reproductives are positively correlated. Interspecies aggregates exhibit almost complete sorting; most spores in a fruiting body come from a single species. Between strains, somatic compatibility correlates weakly with sexual compatibility. It is highest within clones, lower between strains of a species and lowest between strains of different species. Trade‐offs among fitness‐related traits (between compatible strains), sorting out (between incompatible strains) and avoidance (between species) appear to lie behind coexistence.
ISSN:1010-061X
1420-9101
DOI:10.1111/jeb.12298