Experimental Studies of the Evolutionary Significance of Sexual Reproduction. V. A Field Test of the Sib-Competition Lottery Hypothesis

Kelley, Steven E.

doi:10.2307/2409585

Cited by 23 publications

(25 citation statements)

References 6 publications

(11 reference statements)

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“…Specifically, species with similar trophic or other ecological properties are able to occupy the same niche within an ecosystem, and the particular species that occupies a particular space is then determined by stochastic recruitment. This means that within a group of species with similar ecologies, the "lottery" for space is won by whoever gets there first (15,79).…”

Section: Structure Of Bacterial Communities: Assembly Of Functional Gmentioning

confidence: 99%

Bacterial community assembly based on functional genes rather than species

Burke¹,

Steinberg

Rusch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

706

606

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The principles underlying the assembly and structure of complex microbial communities are an issue of long-standing concern to the field of microbial ecology. We previously analyzed the community membership of bacterial communities associated with the green macroalga Ulva australis, and proposed a competitive lottery model for colonization of the algal surface in an attempt to explain the surprising lack of similarity in species composition across different algal samples. Here we extend the previous study by investigating the link between community structure and function in these communities, using metagenomic sequence analysis. Despite the high phylogenetic variability in microbial species composition on different U. australis (only 15% similarity between samples), similarity in functional composition was high (70%), and a core of functional genes present across all algal-associated communities was identified that were consistent with the ecology of surface-and hostassociated bacteria. These functions were distributed widely across a variety of taxa or phylogenetic groups. This observation of similarity in habitat (niche) use with respect to functional genes, but not species, together with the relative ease with which bacteria share genetic material, suggests that the key level at which to address the assembly and structure of bacterial communities may not be "species" (by means of rRNA taxonomy), but rather the more functional level of genes.lateral gene transfer | biofilm | ecological model M etagenomic analysis of environmental microbial communities has revealed an enormous and previously unknown microbial diversity, and expanded our knowledge of their function in a variety of environments (1-5). Much still remains unknown, however, such as the principles underlying the assembly and structure of complex microbial communities, an issue of long-standing concern to the field of microbial ecology. To this aim, several recent studies have supported the "neutral hypothesis" (6-8), a largely stochastic model for community assembly, which assumes that species are ecologically equivalent and that community structure is determined by random processes (9, 10). However, there is also evidence that niche or deterministic processes play a role in community structure (11, 12); thus, both niche and neutral processes are likely to affect the assembly of complex microbial communities.Support for these models is based on species abundance distributions, and critical functional aspects, such as the assumption of ecological equivalence, have for the most part not been tested. In this study, we examine the encoded functions of an algalassociated bacterial community and link patterns of function to patterns of community assembly. Following the results of an earlier study (13), we investigate these communities in the context of the lottery hypothesis, a model for community "assembly" derived from studies of eukaryotic communities, such as coral reef fish (14). This hypothesis incorporates both neutral and functional aspects and arg...

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Section: Structure Of Bacterial Communities: Assembly Of Functional Gmentioning

confidence: 99%

Bacterial community assembly based on functional genes rather than species

Burke¹,

Steinberg

Rusch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

706

606

View full text Add to dashboard Cite

show abstract

“…This hypothesis asserts that species with similar trophic abilities will occupy space within an ecosystem based on stochastic recruitment. That is, within a group of species with similar ecologies, whoever gets there first wins the lottery for space (Kelley, 1989;Munday, 2004). Thus, groups of similar species will only occupy a new niche if it is empty or vacated by another species.…”

Section: Functional Redundancy and The Lottery Hypothesismentioning

confidence: 99%

Composition, uniqueness and variability of the epiphytic bacterial community of the green alga Ulva australis

et al. 2010

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Green Ulvacean marine macroalgae are distributed worldwide in coastal tidal and subtidal ecosystems. As for many living surfaces in the marine environment, little is known concerning the epiphytic bacterial biofilm communities that inhabit algal surfaces. This study reports on the largest published libraries of near full-length 16S rRNA genes from a marine algal surface (5293 sequences from six samples) allowing for an in-depth assessment of the diversity and phylogenetic profile of the bacterial community on a green Ulvacean alga. Large 16S rRNA gene libraries of surrounding seawater were also used to determine the uniqueness of this bacterial community. The surface of Ulva australis is dominated by sequences of Alphaproteobacteria and the Bacteroidetes, especially within the Rhodobacteriaceae, Sphingomonadaceae, Flavobacteriaceae and Sapropiraceae families. Seawater libraries were also dominated by Alphaproteobacteria and Bacteroidetes sequences, but were shown to be clearly distinct from U. australis libraries through the clustering of sequences into operational taxonomic units and Bray-Curtis similarity analysis. Almost no similarity was observed between these two environments at the species level, and only minor similarity was observed at levels of sequence clustering representing clades of bacteria within family and genus taxonomic groups. Variability between libraries of U. australis was relatively high, and a consistent sub-population of bacterial species was not detected. The competitive lottery model, originally derived to explain diversity in coral reef fishes, may explain the pattern of colonization of this algal surface.

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“…Genetic variation has two distinctly different ecological consequences: reducing intra-specific competition (sib-models) and reducing interspecific competition (Lotka-Volterra and character displacement models), which may co-occur but are not necessarily found together. The numerous negative findings against sib-competition (Schmitt & Ehrhardt, 1987;Willson et al, 1987;Kelley, 1989;Cheplick, 1992;Garcia & Toro, 1992) leave untested models of interspecific competition. Since the models of interspecific competition predict coexistence from differences in niche usage, they are close in concept to Vrijenhoek's (1979) ''frozen niche variation hypothesis'': that asexual lineages arise in a sexual population with genotypes frozen to those of the progenitor parent.…”

Section: Introductionmentioning

confidence: 99%

A Lotka–Volterra Model of Coexistence between a Sexual Population and Multiple Asexual Clones

Pound

Doncaster

Cox

2002

Journal of Theoretical Biology

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At carrying capacity, small advantages in competitive ability can compensate a sexual population for its two-fold disadvantage in growth capacity when facing invasion by asexual mutants. In this paper, we develop a generic analytical model to consider the ecology of a sexual population comprising equal numbers of males and females, competing for shared prey resources with multiple female-only clones. We assume that the clones arise from the sexual population and are distinguished from it only by having narrower resource niches and twice the growth capacity. For sexual populations, at density-dependent carrying capacity, intra-specific competition between clonal individuals prevents them from realizing their two-fold advantage in intrinsic growth. This prediction leads to three novel outcomes: (i) a sexual population can coexist with any number of clones, provided their combined competitive impact remains less than the impact of the clones on each other; (ii) a sexual species can immediately exclude asexual invaders if it is a fast growing and strong competitor of shared resources and also has refuge in an abundant alternative resource; (iii) the rate of accumulation of clones in a sexual population will be slowed by intra and inter-specific competition amongst the clones themselves, in addition to the competitive impact from the original sexual population.

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Experimental Studies of the Evolutionary Significance of Sexual Reproduction. V. A Field Test of the Sib-Competition Lottery Hypothesis

Cited by 23 publications

References 6 publications

Bacterial community assembly based on functional genes rather than species

Bacterial community assembly based on functional genes rather than species

Composition, uniqueness and variability of the epiphytic bacterial community of the green alga Ulva australis

A Lotka–Volterra Model of Coexistence between a Sexual Population and Multiple Asexual Clones

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