Microsatellite evidence for tetraploidy in invasive populations of the New Zealand mudsnail, Potamopyrgus antipodarum (Gray, 1843)

Liu, H.-P.; Hershler, Robert; Marn, J.; Worsfold, Tim M.

doi:10.1093/mollus/eyr055

Cited by 11 publications

(10 citation statements)

References 21 publications

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“…Evaluating these nutrient constraint hypotheses with comparisons between distantly related and/or allopatric taxa is difficult because potential differential effects of P limitation are confounded by the many other differences likely to exist between organisms that are not close relatives and/or do not coexist. The recent identification of asexual tetraploids in P. antipodarum (Neiman et al , ; Liu et al ) provides a rare opportunity to study ploidy effects in an experimentally tractable animal system while controlling for mode of reproduction. Our result showing an interaction between ploidy and sensitivity to P limitation suggests that variation in P availability warrants additional attention as a potential driver of ploidy variation.…”

Section: Discussionmentioning

confidence: 99%

Sensitivity to Phosphorus Limitation Increases With Ploidy Level in a New Zealand Snail

2012

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Evolutionary and ecological factors that explain natural variation in ploidy level remain poorly understood. One intriguing possibility is that nutrient costs associated with higher per-cell nucleic acid content could differentially influence the fitness of different ploidy levels. Here, we test this hypothesis by determining whether access to phosphorus (P), a main component of nucleic acids, differentially affects growth rate in asexual freshwater snails (Potamopyrgus antipodarum) that differ in ploidy. As expected if larger genomes generate higher dietary P requirements, tetraploid P. antipodarum experienced a more than twofold greater reduction in growth rate in low-P versus high-P conditions relative to triploids. Mirroring these results, tetraploid P. antipodarum also had a significant reduction in body P content under low P relative to high P, whereas triploid body P content was unaffected. Taken together, these results set the stage for the possibility that P availability could influence the distribution and relative frequency of P. antipodarum of different ploidy levels. These findings could be applicable to many other animal taxa featuring ploidy-level variation, which includes many mixed sexual/asexual taxa.

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Section: Discussionmentioning

confidence: 99%

Sensitivity to Phosphorus Limitation Increases With Ploidy Level in a New Zealand Snail

2012

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“…First, because we did not include any tetraploid representatives of invasive lineages (tetraploidy is extremely rare in invasive P. antipodarum , which appear to be nearly all triploid; Liu et al. ) and because ploidy influences P. antipodarum response to limited dietary P (Neiman et al. ), we excluded all members of the five tetraploid lineages from data analysis, leaving the 15 native and five invasive triploid lineages.…”

Section: Methodsmentioning

confidence: 99%

Sensitivity to dietary phosphorus limitation in native vs. invasive lineages of a New Zealand freshwater snail

Neiman

Krist

2016

Ecological Applications

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Why some species and lineages are more likely to be invasive than others is one of the most important unanswered questions in basic and applied biology. In particular, the relative contributions to the invasion process of factors like pre-adaptation to invasiveness in the native range, evolution post-colonization, and random vs. non-random sampling of colonist lineages remain unclear. We use a powerful common garden approach to address the potential for a role for sensitivity to nutrient limitation in determining the invasiveness of particular lineages of Potamopyrgus antipodarum, a New Zealand freshwater snail that has become globally invasive. We quantified specific growth rate (SGR), an important fitness-related trait in this species, under high phosphorus (P) vs. low-P conditions for a diverse set of native and invasive P. antipodarum. This experiment revealed that native-range P. antipodarum experience a more severe decline in SGR in low-P conditions relative to SGR in high-P conditions than their invasive range counterparts. Although these results suggest resilience to P limitation in invasive lineages, the absence of significant absolute differences in SGR between native and invasive lineages indicates that a straightforward connection between response to P limitation and invasiveness in P. antipodarum is unlikely. Regardless, our data demonstrate that invasive vs. native lineages of P. antipodarum exhibit consistently different responses to an important environmental variable that is rarely studied in the context of invasion success. Further studies directed at exploring and disentangling the roles of sampling effects, selection on preexisting variation, and evolution after colonization will be required to provide a comprehensive picture of the role (or lack thereof) of nutrient limitation in the global invasion of P. antipodarum, as well for as other invasive taxa.

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“…As asexual P. antipodarum, like many asexual animals (Suomalainen, 1987;Otto and Whitton, 2000), are polyploid (triploid or higher; Neiman et al, 2011;Liu et al, 2012) whereas sexuals are diploid (Wallace, 1992), the occasional documentation of polyploid male P. antipodarum within lake populations that are otherwise dominated by female asexuals (Wallace, 1992;Lively and Jokela, 2002;Neiman et al, 2011) hinted that at least some asexual P. antipodarum might pay a cost of males. Here, we addressed this possibility by evaluating whether and how often experimental populations founded by a diverse set of female asexual P. antipodarum collected from multiple different New Zealand lake populations produce males and whether some asexual lineages are more likely to produce males than others.…”

Section: Introductionmentioning

confidence: 99%

Male offspring production by asexual Potamopyrgus antipodarum, a New Zealand snail

Neiman¹,

Larkin²,

Thompson³

et al. 2012

Heredity

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As only females contribute directly to population growth, sexual females investing equally in sons and daughters experience a two-fold cost relative to asexuals producing only daughters. Typically, researchers have focused on benefits of sex that can counter this 'cost of males' and thus explain its predominance. Here, we instead ask whether asexuals might also pay a cost of males by quantifying the rate of son production in 45 experimental populations ('lineages') founded by obligately asexual female Potamopyrgus antipodarum. This New Zealand snail is a powerful model for studying sex because phenotypically similar sexual and asexual forms often coexist, allowing direct comparisons between sexuals and asexuals. After 2 years of culture, 23 of the 45 lineages had produced males, demonstrating that asexual P. antipodarum can make sons. We used maximumlikelihood analysis of a model of male production in which only some lineages can produce males to estimate that B50% of lineages have the ability to produce males and that B5% of the offspring of male-producing lineages are male. Lineages producing males in the first year of the experiment were more likely to make males in the second, suggesting that some asexual lineages might pay a cost of males relative to other asexual lineages. Finally, we used a simple deterministic model of population dynamics to evaluate how male production affects the rate of invasion of an asexual lineage into a sexual population, and found that the estimated rate of male production by asexual P. antipodarum is too low to influence invasion dynamics.

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Microsatellite evidence for tetraploidy in invasive populations of the New Zealand mudsnail, Potamopyrgus antipodarum (Gray, 1843)

Cited by 11 publications

References 21 publications

Sensitivity to Phosphorus Limitation Increases With Ploidy Level in a New Zealand Snail

Sensitivity to Phosphorus Limitation Increases With Ploidy Level in a New Zealand Snail

Sensitivity to dietary phosphorus limitation in native vs. invasive lineages of a New Zealand freshwater snail

Male offspring production by asexual Potamopyrgus antipodarum, a New Zealand snail

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