Evaluating the use of coded-wire tags in individually marking Odonata larvae

Catania, Shantel V. L.; McCauley, Shannon J.

doi:10.4039/tce.2015.43

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…We kept larvae in opaque plastic cups filled with 473 mL of dechlorinated water at a 15 h light : 9 h dark photoperiod prior to the experiment. We uniquely marked larvae with coded wire tags (CWT; Northwest Marine Technology, Shaw Island, Washington, USA; Catania and McCauley ). We measured head width, a proxy for body size (Corbett ), to the nearest 0.16 mm, and mass to the nearest 0.0001 g. We scored body condition with the residuals from a log e −log e regression of body mass on head width.…”

Section: Methodsmentioning

confidence: 99%

Larval body condition regulates predator‐induced life‐history variation in a dragonfly

Moore

Lis

Martin

2017

Ecology

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Abstract. Organisms with complex life cycles commonly exhibit adaptive plasticity in the timing of transitions between life stages. While the threat of predation is predicted to induce earlier transitions, empirical support has been equivocal. When predation risk affects both the propensity to transition to the next life stage and the ability to reach the energetic thresholds necessary to complete the transition, only those individuals in the best physiological condition may be able to accelerate development and emerge earlier. To test this hypothesis, we followed uniquely marked dragonfly larvae (Pachydiplax longipennis) through emergence in pools where we factorially manipulated the presence of a large heterospecific predator (Anax junius) and cannibalism risk via conspecific size variation. Consistent with our hypothesis, high-condition larvae were more likely to emerge in the presence of the heterospecific predator than in its absence, and low-condition larvae were more likely to emerge in its absence than in its presence. Moreover, high-condition larvae emerged earlier when cannibalism risk was high than when it was low. Predation risk therefore has condition-dependent effects on emergence. As predation risk frequently affects resource accumulation, similar mechanisms across taxa could commonly underlie the incongruence between empirical results and theoretical expectations for predator-induced life-history variation.

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Section: Methodsmentioning

confidence: 99%

Larval body condition regulates predator‐induced life‐history variation in a dragonfly

Moore

Lis

Martin

2017

Ecology

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Trade-offs between larval survival and adult ornament development depend on predator regime in a territorial dragonfly

Moore

Martin

2018

Oecologia

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Trade-offs between juvenile survival and the development of sexually selected traits can cause ontogenetic conflict between life stages that constrains adaptive evolution. However, the potential for ecological interactions to alter the presence or strength of these trade-offs remains largely unexplored. Antagonistic selection over the accumulation and storage of resources could be one common cause of environment-specific trade-offs between life stages: higher condition may simultaneously enhance adult ornament development and increase juvenile vulnerability to predators. We tested this hypothesis in an ornamented dragonfly (Pachydiplax longipennis). Higher larval body condition indeed enhanced the initial development of its intrasexually selected wing coloration, but was opposed by viability selection in the presence of large aeshnid predators. In contrast, viability selection did not oppose larval body condition in pools when aeshnids were absent, and was not affected when we manipulated cannibalism risk. Trade-offs between larval survival and ornament development, mediated through the conflicting effects of body condition, therefore occurred only under high predation risk. We additionally characterized how body condition influences several traits associated with predator avoidance. Although body condition did not affect burst distance, it did increase larval abdomen size, potentially making larvae easier targets for aeshnid predators. As high body condition similarly increases vulnerability to predators in many other animals, predator-mediated costs of juvenile resource accumulation could be a common, environment-specific limitation on the elaboration of sexually selected traits.

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Evaluating the use of coded-wire tags in individually marking Odonata larvae

Cited by 2 publications

References 13 publications

Larval body condition regulates predator‐induced life‐history variation in a dragonfly

Larval body condition regulates predator‐induced life‐history variation in a dragonfly

Trade-offs between larval survival and adult ornament development depend on predator regime in a territorial dragonfly

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