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Interspecies and intraspecies interactions in social amoebae

Sathe, S and Khetan, N and Nanjundiah, V (2014) Interspecies and intraspecies interactions in social amoebae. In: JOURNAL OF EVOLUTIONARY BIOLOGY, 27 (2). pp. 349-362.

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Official URL: http://dx.doi.org/10.1111/jeb.12298


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.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the WILEY-BLACKWELL, USA
Keywords: chimaera; cooperation; Dictyostelium; guild; microbial diversity; niche overlap; reproductive skew; social behaviour; sorting out
Department/Centre: Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Date Deposited: 20 Feb 2014 05:16
Last Modified: 16 Oct 2018 10:56
URI: http://eprints.iisc.ac.in/id/eprint/48412

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