Speciation by symbiosis

Brucker, Robert M.; Bordenstein, Seth R.

doi:10.1016/j.tree.2012.03.011

Cited by 325 publications

(333 citation statements)

References 80 publications

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“…Finally, this suggests that there could be a conflict of interest between investing in environmentally similar mates while limiting the investment in related individuals (Mack et al, 2002). Preference for environmentally similar mates accounts for the recent findings that gut bacteria specificity can drive assortative mating, and potentially divergence between populations (reviewed in Brucker and Bordenstein, 2012), and this appears to be the case in D. melanogaster (Sharon et al, 2010(Sharon et al, , 2011.…”

Section: Discussionmentioning

confidence: 85%

Kin recognition inDrosophila: the importance of ecology and gut microbiota

2013

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The animal gut commonly contains a large reservoir of symbiotic microbes. Although these microbes have obvious functions in digestion and immune defence, gut microbes can also affect behaviour. Here, we explore whether gut microbiota has a role in kin recognition. We assessed whether relatedness, familiarity and food eaten during development altered copulation investment in three species of Drosophila with diverse ecologies. We found that a monandrous species exhibited true kin recognition, whereas familiarity determined kin recognition in a species living in dense aggregations. Finally, in a food generalist species, food eaten during development masked kin recognition. The effect of food type on copulation duration, in addition to the removal of this effect via antibiotic treatment, suggests the influence of bacteria associated with the gut. Our results provide the first evidence that varied ecologically determined mechanisms of kin recognition occur in Drosophila, and that gut bacteria are likely to have a key role in these mechanisms.

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Section: Discussionmentioning

confidence: 85%

Kin recognition inDrosophila: the importance of ecology and gut microbiota

2013

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“…In 1927, the microbiologist Ivan E. Wallin hypothesized in his book, Symbionticism and the Origin of Species (46), that the acquisition of bacterial endosymbionts favors the origin of new species. Recently, Brucker and Bordenstein summarized three general observations which link bacterial colonization and speciation (47). First, microbial colonizers are universally present in eukaryotic hosts.…”

Section: Discussionmentioning

confidence: 99%

Distinct antimicrobial peptide expression determines host species-specific bacterial associations

Franzenburg

Walter

Künzel

et al. 2013

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

264

291

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Animals are colonized by coevolved bacterial communities, which contribute to the host's health. This commensal microbiota is often highly specific to its host-species, inferring strong selective pressures on the associated microbes. Several factors, including diet, mucus composition, and the immune system have been proposed as putative determinants of host-associated bacterial communities. Here we report that species-specific antimicrobial peptides account for different bacterial communities associated with closely related species of the cnidarian Hydra. Gene family extensions for potent antimicrobial peptides, the arminins, were detected in four Hydra species, with each species possessing a unique composition and expression profile of arminins. For functional analysis, we inoculated arminin-deficient and control polyps with bacterial consortia characteristic for different Hydra species and compared their selective preferences by 454 pyrosequencing of the bacterial microbiota. In contrast to control polyps, arminin-deficient polyps displayed decreased potential to select for bacterial communities resembling their native microbiota. This finding indicates that species-specific antimicrobial peptides shape species-specific bacterial associations.host-microbe | Cnidaria | phylosymbiotic | core microbiota | holobiont

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“….to assess whether symbionts accelerate the evolution of reproductive barriers [compared to] other causes of reproductive barriers. (24) There are some much more radically skeptical responses than these, however, and symbiogeneticists like Margulis are not alone in doubting the sufficiency of genetic analyses to explain the history of life. Paleontologists historically have felt strong affiliations to the position that microevolutionary processes are unable to explain macroevolutionary patterns (e.g., refs.…”

Section: Explanatory Sufficiency and Reducibilitymentioning

confidence: 99%

Endosymbiosis and its implications for evolutionary theory

O’Malley

2015

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

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Historically, conceptualizations of symbiosis and endosymbiosis have been pitted against Darwinian or neo-Darwinian evolutionary theory. In more recent times, Lynn Margulis has argued vigorously along these lines. However, there are only shallow grounds for finding Darwinian concepts or population genetic theory incompatible with endosymbiosis. But is population genetics sufficiently explanatory of endosymbiosis and its role in evolution? Population genetics "follows" genes, is replication-centric, and is concerned with vertically consistent genetic lineages. It may also have explanatory limitations with regard to macroevolution. Even so, asking whether population genetics explains endosymbiosis may have the question the wrong way around. We should instead be asking how explanatory of evolution endosymbiosis is, and exactly which features of evolution it might be explaining. This paper will discuss how metabolic innovations associated with endosymbioses can drive evolution and thus provide an explanatory account of important episodes in the history of life. Metabolic explanations are both proximate and ultimate, in the same way genetic explanations are. Endosymbioses, therefore, point evolutionary biology toward an important dimension of evolutionary explanation.endosymbiosis | evolutionary theory | macroevolution | eukaryogenesis | metabolism M any historical accounts have viewed organelle-producing endosymbioses and symbioses in general as competing conceptually against standard evolutionary theory. Although there are several older claims to this effect, I will focus on Lynn Margulis's conjectures about how endosymbioses can be interpreted as posing problems for neo-Darwinian evolutionary theory. My aim is to assess whether endosymbiosis does in fact put pressure on evolutionary biologists and philosophers of evolution to expand beyond gene frequencies and encompass alternative explanatory frameworks.Rather than agents of revolution bent on overthrowing evolutionary theory, it is more likely that endosymbiotic relationships offer their greatest explanatory value as model systems for macroevolution. Such systems can tell us a great deal about conflict and control dynamics in ongoing organismal interactions. They provide remarkable examples of enduring evolutionary game-changing mutualistic relationships, and call out for an account of why such relationships persist and become increasingly stable.However, instead of focusing on "informational" properties of organisms, endosymbiotic systems draw attention to metabolism as a central organizing feature of life. A metabolic perspective focuses explanatorily on biochemical networks rather than genes, on phenotypic interactions rather than informational inheritance, on communities in addition to isolated organisms and lineages, and on major diversifications in the history of life. "Endosymbiotic" views of evolution are therefore valuable for expanding evolutionary explanations, even if they do not constitute a fullblown theoretical alternative to standard evolutionary...

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Speciation by symbiosis

Cited by 325 publications

References 80 publications

Kin recognition inDrosophila: the importance of ecology and gut microbiota

Kin recognition inDrosophila: the importance of ecology and gut microbiota

Distinct antimicrobial peptide expression determines host species-specific bacterial associations

Endosymbiosis and its implications for evolutionary theory

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