Ecological Opportunity in Adaptive Radiation of Galápagos Endemic Land Snails

Parent,; Crespí,

doi:10.2307/27735903

Cited by 43 publications

(74 citation statements)

References 41 publications

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“…Among birds, Galapagos mocking birds also appear to follow the progression rule (66), although Darwin's finches show limited evidence of diversification closely associated with the geological formation of the islands (2). A progression pattern has been inferred for Galapagos bulimulid land snails (67). In contrast, insects including Galapagos flightless weevils (Galapaganus) (68) and the microlepidopteran genus Galagete (69) do not follow the progression rule.…”

Section: The Progression Rule In Comparative Island Phylogeographymentioning

confidence: 99%

Comparative phylogeography of oceanic archipelagos: Hotspots for inferences of evolutionary process

Shaw

Gillespie

2016

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

143

151

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Remote island archipelagos offer superb opportunities to study the evolution of community assembly because of their relatively young and simple communities where speciation contributes to the origin and evolution of community structure. There is great potential for common phylogeographic patterns among remote archipelagos that originate through hotspot volcanism, particularly when the islands formed are spatially isolated and linearly arranged. The progression rule is characterized by a phylogeographic concordance between island age and lineage age in a species radiation. Progression is most likely to arise when a species radiation begins on an older island before the emergence of younger islands of a hotspot archipelago. In the simplest form of progression, colonization of younger islands as they emerge and offer appropriate habitat, is coincident with cladogenesis. In this paper, we review recent discoveries of the progression rule on seven hotspot archipelagos. We then discuss advantages that progression offers to the study of community assembly, and insights that community dynamics may offer toward understanding the evolution of progression. We describe results from two compelling cases of progression where the mosaic genome may offer insights into contrasting demographic histories that shed light on mechanisms of speciation and progression on remote archipelagos.progression rule | speciation | priority effect | community assembly | radiation zone

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Section: The Progression Rule In Comparative Island Phylogeographymentioning

confidence: 99%

Comparative phylogeography of oceanic archipelagos: Hotspots for inferences of evolutionary process

Shaw

Gillespie

2016

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

143

151

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“…As lineages diversify into multiple species, competition between newly formed species would intensify. Consequently, the diversification rate would decrease as species accumulate in the limited space (3,14). In this study, we use DNA sequence data and a variety of analytical methods to test whether the habitat shift of Gammarus promoted diversification rates.…”

mentioning

confidence: 99%

Eocene habitat shift from saline to freshwater promoted Tethyan amphipod diversification

Hou

Ŝket

Fišer

et al. 2011

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

148

238

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Current theory predicts that a shift to a new habitat would increase the rate of diversification, while as lineages evolve into multiple species, intensified competition would decrease the rate of diversification. We used Holarctic amphipods of the genus Gammarus to test this hypothesis. We sequenced four genes (5,088 bp) for 289 samples representing 115 Gammarus species. A phylogenetic analysis showed that Gammarus originated from the Tethyan region with a saline ancestry in the Paleocene, and later colonized the freshwater habitat in the Middle Eocene. Ancestral range reconstruction and diversification mode analysis combined with paleogeological and paleoclimatic evidence suggested that the habitat shift from saline to freshwater led to an increased diversification rate. The saline lineage of Gammarus dispersed to both sides of the Atlantic at 55 million years ago (Ma), because of the few barriers between the Tethys and the Atlantic, and diversified throughout its evolutionary history with a constant diversification rate [0.04 species per million years (sp/My)]. The freshwater Gammarus, however, underwent a rapid diversification phase (0.11 sp/My) until the Middle Miocene, and lineages successively diversified across Eurasia via vicariance process likely driven by changes of the Tethys and landmass. In particular, the freshwater Gammarus lacustris and Gammarus balcanicus lineages had a relatively high diversification shift, corresponding to the regression of the Paratethys Sea and the continentalization of Eurasian lands during the Miocene period. Subsequently (14 Ma), the diversification rate of the freshwater Gammarus decreased to 0.05 and again to 0.01 sp/My. The genus Gammarus provides an excellent aquatic case supporting the hypothesis that ecological opportunities promote diversification.evolution | molecular dating | range expansion

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“…In the case of L. clamitans, there is very little diet variation between individuals and this small amount of variation may not be affected by ecological parameters. While ecological opportunity and its associated resource diversity increase IS in many species (Nosil and Reimchen 2005;Parent and Crespi 2009;Darimont et al 2009), our results combined with at least one other study demonstrated that it is not ecologically universal (Evangelista et al 2014).…”

Section: !supporting

confidence: 54%

“…For example, while most studies have found that IS is greater in areas that have more resources or a more heterogeneous habitat (Darimont et al 2009;Parent and Crespi 2009;Martin and Pfennig 2010;Matich et al 2011), some species do not respond to ecological opportunity and resource diversity in the same way (Evangelista et al 2014). When intraspecific competition is high, some studies found that IS increased Tinker et al 2012;Darimont et al 2009;Frédérich et al 2010) but others found that IS decreased (Jones and Post 2013;Parent et al 2014).…”

Section: !mentioning

confidence: 99%

“…For example, IS is greater when intraspecific competition is high (Svanäck and Bolnick 2007;Agashe and Bolnick 2010;Frédérich et al 2010;Tinker et al 2012;Evangelista et al 2014), when interspecific competition is low ; however see Bolnick et al 2010: AbbeyLee 2013, and when some form of ecological opportunity is available (Nosil and 3! Reimchen 2005;Parent and Crespi 2009;Darimont et al 2009). These ecological parameters that influence IS are likely to change over time, and populations can move between being composed of individual specialists versus of individual generalists (Tinker et al 2008).…”

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confidence: 99%

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The evolution and ecology of individual specializations amongst a group of dietary generalists.

Cloyed¹

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This dissertation examines individual diet specializations (IS) in a group of ecologically similar and evolutionarily related frogs and toads. Individual specialization is known to have widespread ecological and evolutionary effects.In an initial literature review (Chapter 2) I build a comprehensive theoretical framework showing how different types of population diversity can help, halt, or hinder sympatric speciation. I argue that IS can be maintained indefinitely in populations yet fail to lead to speciation because it is influenced by ecological conditions that may change.Additionally, IS can potentially aid niche partitioning among similar species, increasing species coexistence and resulting in less of the ecological opportunity required to develop more discrete polymorphisms.Stable isotopes are an increasingly common ecological tool for determining diets and habitat usage. However, to use them accurately, researchers need taxon-specific trophic discrimination factors and isotopic incorporation rates on any tissue used for stable isotope analysis. I determined these important isotope properties in adult frogs for the first time (Chapter 3), which not only allows me to use them in the following sections of v! my dissertation, but also allows other researchers to use stable isotopes to study frog and toad diets.Using stable isotope analyses, I examined how IS is influenced by ecological conditions (Chapter 4). I measured IS in five species of frogs and toads and determined which of three ecological parameters (resource diversity, intraspecific competition, and interspecific competition) affected IS in each species. I found that species differed in which ecological parameter best explained IS. Resource diversity most frequently affected IS, with conspecific density second in importance. My results showed that different ecological conditions support IS in different species.Finally, again using stable isotopes, I investigated whether intrapopulation niche variation could aid niche partitioning among the same five species of frogs and toads (Chapter 5). I found that species differed in their niches, but that subsets of individuals overlapped among species. The limited number of individuals overlapping between species decreases their interaction strength, which can contribute to niche partitioning and thus to species coexistence.vi!

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Ecological Opportunity in Adaptive Radiation of Galápagos Endemic Land Snails

Cited by 43 publications

References 41 publications

Comparative phylogeography of oceanic archipelagos: Hotspots for inferences of evolutionary process

Comparative phylogeography of oceanic archipelagos: Hotspots for inferences of evolutionary process

Eocene habitat shift from saline to freshwater promoted Tethyan amphipod diversification

The evolution and ecology of individual specializations amongst a group of dietary generalists.

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