How to build a puncture- and breakage-resistant eggshell? Mechanical and structural analyses of avian brood parasites and their hosts
| العنوان: | How to build a puncture- and breakage-resistant eggshell? Mechanical and structural analyses of avian brood parasites and their hosts |
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| المؤلفون: | Pablo Risso, Vanina D. Fiorini, Raul Eduardo Bolmaro, Mark E. Hauber, Analía V. López, Juan C. Reboreda, Vanina Mercedes Tartalini, M. Avalos, Lia Noemi Gerschenson |
| المصدر: | Journal of Experimental Biology. 224 |
| بيانات النشر: | The Company of Biologists, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Brood parasite, Reproductive success, Obligate, Physiology, Host (biology), Zoology, Punctures, Interspecific competition, Aquatic Science, Biology, Palisade cell, Host-Parasite Interactions, Nesting Behavior, Egg Shell, Insect Science, Ultrastructure, Animals, Parasites, Animal Science and Zoology, Passeriformes, Eggshell, Molecular Biology, Phylogeny, Ecology, Evolution, Behavior and Systematics |
| الوصف: | Evolved eggshell strength is greater in several lineages of obligate avian brood parasites (birds that lay their eggs in other species' nests) than in their hosts. Greater strength is typically indirectly implied by eggshell thickness comparisons between parasites and hosts. Nevertheless, there is strong evidence that the eggshell structural organization differentially influences its mechanical properties. Using instrumental puncture tests and SEM/EBSD and XRD techniques, we studied the most relevant eggshell mechanical, textural, ultrastructural and microstructural features between several host species and their parasitic cowbirds (Molothrus spp.). These parasitic species display different egg-destructive behaviors, reducing host reproductive fitness, including the more frequently host-egg puncturing M. rufoaxillaris and M. bonariensis, and the host egg-removing M. ater. The results, analyzed using a phylogenetic comparative approach, showed interspecific patterns in the mechanical and structural features. Overall, the eggshells of the two egg-puncturing parasites (but not of M. ater) were stronger, stiffer and required greater stress to produce a fracture than the respective hosts' eggs. These features were affected by eggshell microstructure and ultrastructure, related to the increase in the intercrystalline boundary network acting in cooperation with the increase in palisade layer thickness. Both structural features generate more options and greater lengths of intercrystalline paths, increasing the energy consumed in crack or fissure propagation. The reported patterns of all these diverse eggshell features support a new set of interpretations, confirming several hypotheses regarding the impact of the two reproductive strategies (parasitic versus parental) and parasitic egg destruction behaviors (more versus less frequently puncturing). |
| تدمد: | 1477-9145 0022-0949 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab1656baa77c3c976e7f23f18a082967 https://doi.org/10.1242/jeb.243016 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....ab1656baa77c3c976e7f23f18a082967 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14779145 00220949 |
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