Evolution of maternal egg size effects in sister salamander species

Landberg, Tobias

doi:10.1387/ijdb.140324tl

Cited by 6 publications

(9 citation statements)

References 37 publications

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“…Research in other organisms has also indicated a broad importance of variation in yolk stores to suites of offspring traits (e.g., Lancaster et al 2010, Landberg 2014, 2015), and the findings of our study add to the body of work suggesting an integrative role of yolk stores to offspring traits. Additionally, there was a weak tendency for the Surgical Control individuals to express trait values that were intermediate to the Reduced and Unmanipulated individuals (e.g., Fig.…”

Section: Discussionsupporting

confidence: 73%

“…1b). Use of this yolk manipulation technique in other Ambystoma has also indicated an effect of the Surgical Control on offspring traits (Landberg 2014, 2015), and may reflect the well‐documented response of amphibians to pre‐hatching environmental effects (e.g., Touchon et al 2013) or an artifact of our sampling design. Despite these small effects, our experimental study strongly implicates an integrative relationship between yolk stores and a suite of offspring traits.…”

Section: Discussionmentioning

confidence: 82%

“…In the Reduced treatment, a glass surgical needle (0.2 mm diameter opening) was inserted through the egg membranes, ventrally into the abdominal yolk mass, and ;20% of the embryonic yolk stores were removed using gentle vacuum suctioning. This technique isolated the specific effect of variation in investment in embryonic yolk reserves, the primary source of maternal investment in most amphibians, and previous work indicates that such variation in yolk reserves falls within the range observed across several Ambystoma (Landberg 2014(Landberg , 2015. The Surgical Control treatment followed the same procedure as the Reduced treatment, but no yolk was removed.…”

Section: Embryonic Stage and Yolk Investment Manipulationmentioning

confidence: 99%

“…In this study, we investigated how maternal investment in offspring yolk reserves mediates offspring life history traits through reproductive maturity across a range of environmental conditions. We experimentally manipulated maternal investment using a surgical technique that removes embryonic yolk reserves (Landberg 2014, 2015), and reared individuals at varying conspecific densities to manipulate the quality of the offspring environment. We assumed that given equal amounts of resources, low‐density conditions would be more favorable to offspring than high‐density conditions.…”

Section: Introductionmentioning

confidence: 99%

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Maternal investment mediates offspring life history variation with context‐dependent fitness consequences

Moore¹,

Landberg²,

Whiteman³

2015

Ecology

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Maternal effects, such as per capita maternal investment, often interact with environmental conditions to strongly affect traits expressed early in ontogeny. However, their impact on adult life history traits and fitness components is relatively unknown. Theory predicts that lower per capita maternal investment will have strong fitness costs when the offspring develop in unfavorable conditions, yet few studies have experimentally manipulated per capita maternal investment and followed offspring through adulthood. We used a surgical embryonic yolk removal technique to investigate how per capita maternal investment interacted with an important ecological factor, larval density, to mediate offspring life history traits through reproductive maturity in an amphibian, Ambystoma talpoideum. We predicted that increased larval density would reinforce the life history variation induced by differences in per capita investment (i.e., Controls vs. Reduced Yolk), with Reduced larvae ultimately expressing traits associated with lower fitness than Controls when raised at high densities. We found that Reduced individuals were initially smaller and more developed, caught up in size to Controls within the first month of the larval stage, but were smaller at the end of the larval stage in low densities. Reduced individuals also were more likely to undergo metamorphosis at high densities and mature 'females invested in more eggs for their body sizes than Controls. Together, our results do not support our hypothesis, but instead indicate that Reduced individuals express traits associated with higher fitness when they develop in high-density environments, but lower fitness in low-density environments. The observed life history and fitness patterns are consistent with the "maternal match" hypothesis, which predicts that when the maternal environment (e.g., high density) results in phenotypic variation that is transmitted to the offspring (e.g., reduced per capita yolk investment), and offspring face that same environment (e.g., high larval density), the fitness of both mother and offspring is maximized.

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Section: Discussionsupporting

confidence: 73%

Section: Discussionmentioning

confidence: 82%

Section: Embryonic Stage and Yolk Investment Manipulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maternal investment mediates offspring life history variation with context‐dependent fitness consequences

Moore¹,

Landberg²,

Whiteman³

2015

Ecology

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“…Minimizing environmental maternal effects precludes the ability to identify the role they might play in adaptive evolution. Of course, they may play no role and represent merely an extra source of environmental variation that must be minimized before genetic distinctions can be quantified precisely (Landberg, ; Michimae, Nishimura, Tamori, & Wakahara, ; Monaghan, ). On the other hand, they might contribute substantially to forming a locally adapted phenotype.…”

Section: Introductionmentioning

confidence: 99%

Unique maternal and environmental effects on the body morphology of the Least Killifish, Heterandria formosa

Landy

Travis

2018

Ecology and Evolution

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An important step in diagnosing local adaptation is the demonstration that phenotypic variation among populations is at least in part genetically based. To do this, many methods experimentally minimize the environmental effect on the phenotype to elucidate the genetic effect. Minimizing the environmental effect often includes reducing possible environmental maternal effects. However, maternal effects can be an important factor in patterns of local adaptation as well as adaptive plasticity. Here, we report the results of an experiment with males from two populations of the poeciliid fish, Heterandria formosa, designed to examine the relative influence of environmental maternal effects and environmental effects experienced during growth and development on body morphology, and, in addition, whether the balance among those effects is unique to each population. We used a factorial design that varied thermal environment and water chemistry experienced by mothers and thermal environment and water chemistry experienced by offspring. We found substantial differences between the two populations in their maternal and offspring norms of reaction of male body morphology to differences in thermal environment and water chemistry. We also found that the balance between maternal effects and postparturition environmental effects differed from one thermal regime to another and among traits. These results indicate that environmental maternal effects can be decidedly population‐specific and, as a result, might either contribute to the appearance of or blur evidence for local adaptation. These results also suggest that local adaptation might also occur through the evolution of maternal norms of reaction to important, and varying, environmental factors.

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Effects of embryo energy, egg size, and larval food supply on the development of asteroid echinoderms

Trackenberg

Richardson

Allen

2020

Ecology and Evolution

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Organisms have limited resources available to invest in reproduction, causing a trade‐off between the number and size of offspring. One consequence of this trade‐off is the evolution of disparate egg sizes and, by extension, developmental modes. In particular, echinoid echinoderms (sea urchins and sand dollars) have been widely used to experimentally manipulate how changes in egg size affect development. Here, we test the generality of the echinoid results by (a) using laser ablations of blastomeres to experimentally reduce embryo energy in the asteroid echinoderms (sea stars), Pisaster ochraceus and Asterias forbesi and (b) comparing naturally produced, variably sized eggs (1.7‐fold volume difference between large and small eggs) in A. forbesi . In P. ochraceus and A. forbesi , there were no significant differences between juveniles from both experimentally reduced embryos and naturally produced eggs of variable size. However, in both embryo reduction and egg size variation experiments, simultaneous reductions in larval food had a significant and large effect on larval and juvenile development. These results indicate that (a) food levels are more important than embryo energy or egg size in determining larval and juvenile quality in sea stars and (b) the relative importance of embryo energy or egg size to fundamental life history parameters (time to and size at metamorphosis) does not appear to be consistent within echinoderms.

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Evolution of maternal egg size effects in sister salamander species

Cited by 6 publications

References 37 publications

Maternal investment mediates offspring life history variation with context‐dependent fitness consequences

Maternal investment mediates offspring life history variation with context‐dependent fitness consequences

Unique maternal and environmental effects on the body morphology of the Least Killifish, Heterandria formosa

Effects of embryo energy, egg size, and larval food supply on the development of asteroid echinoderms

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