Cambios estructurales en cáscaras de huevos de Caiman latirostris

Simoncini, Melina Soledad; Fernández, Mariela Soledad; Iungman, Josefina Luciana

doi:10.7550/rmb.36240

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…); similar observations have been made in other species such as the American alligator [20,35,36]. Also in both species, there was an increase in size (from 0.05 to 0.1 mm) and number of pores [18,20,37]. These changes in the eggshell could facilitate gas interchange between the embryo and the atmosphere [20,37,38,39].…”

Section: Discussionsupporting

confidence: 58%

“…These columns are interconnected, and overlaid in places with a secondary thin shell outer layer. Additional structural and functional details of the shell structure of C. latirostris are outlined in [18].…”

Section: Discussionmentioning

confidence: 99%

“…However, little is known about the tolerance of the embryos to flooding [6,17], or if this tolerance could be altered by eggshell structure. As development occurs, the eggshell gets thinner [18] and the number and size of pores increases [19,20]. These changes could be adaptations to avoid hypoxia, as hypoxia reduces hatching success [21] and/or has subsequent adverse effects on hatchlings [22].…”

Section: Introductionmentioning

confidence: 99%

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Eggshell structure in Caiman latirostris eggs improves embryo survival during nest inundation

Cedillo-Leal

Simoncini²,

Leiva

et al. 2017

Proc. R. Soc. B.

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Egg inundation often results in poor hatching success in crocodylians. However, how tolerant eggs are to submergence, and/or how eggshell ultrastructure may affect embryo survival when inundated, are not well understood. In this study, our objective was to determine if embryo survival in Caiman latirostris is affected by eggshell surface roughness, when eggs are submerged under water. Tolerance to inundation was tested early (day 30) versus late (day 60) in development, using eight clutches (four per time treatments), subdivided into four groups: (N ¼ 9 per clutch per treatment; 9 Â 4 ¼ 36 eggs per group). 'Rough' eggshell represented the natural, unmodified eggshell surface structure. 'Smooth' eggshell surface structure was created by mechanically sanding the natural rough surface to remove surface columnar elements and secondary layer features, e.g. irregularities that result in 'roughness'. When inundated by submerging eggs under water for 10 h at day 30, 'smooth' eggshell structure resulted in more than twice as many dead embryos (16 versus 6, smooth versus rough; N ¼ 36), and fewer than half as many healthy embryos (6 versus 13, smooth versus rough, respectively; N ¼ 36). By contrast, at day 60, inundation resulted in very low hatching success, regardless of eggshell surface structure. Only two hatchlings survived the inundation, notably in the untreated group with intact, rough eggshells. Inundation produced a high rate of malformations (58% at day 30), but did not affect hatchling size. Our results indicate that eggshell roughness enhances embryo survival when eggs are inundated early in development, but not late in development. Apparently, the natural surface 'roughness' entraps air bubbles at the eggshell surface during inundation, thereby facilitating gas exchange through the eggshell even when the egg is submerged under water.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eggshell structure in Caiman latirostris eggs improves embryo survival during nest inundation

Cedillo-Leal

Simoncini²,

Leiva

et al. 2017

Proc. R. Soc. B.

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“…Ferguson 15 demonstrated strong external acidic dissolution of the eggshells coupled with internal dissolution mediated by calcium mobilization during the development of A. mississippiensis . Simoncini et al 12 also documented a 20% thinning in the shells of C. latirostris throughout the whole incubation process, although whether this latter corresponds to intrinsic or extrinsic dissolution or a combination of both, remains unclear. Although our sampling only covered a fraction of the incubation process (stages 15 to 21 in C. latirostris and 17–18 to 23 in C. yacare ), it was enough to detect a significant thinning in the compact layer of the eggshells of C. latirostris .…”

Section: Discussionmentioning

confidence: 99%

“…The eggs of at least a few crocodilian species, such as Alligator mississippiensis and Caiman latirostris , are adapted to withstand dissolution of up to 20% of the total thickness of their shells during the incubation process 12 , 15 . This shell thinning results from a combination of calcium mobilization during embryonic ossification (a process also shared with several archosaurs 16 , 17 ) and the erosion by organic acids during the decomposition of organic matter within mound nests 15 .…”

Section: Introductionmentioning

confidence: 99%

Unexpected morphological variability in the eggshells of the South American caimans Caiman latirostris and Caiman yacare

Hechenleitner

Blanco

Nuñéz-Campero

et al. 2023

Sci Rep

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Eggshell morphology is a valuable indicator of the local conditions within the nests of modern crocodilians and birds. In contrast to these latter, the anatomical structure of the eggshells of most crocodilian species is practically unknown. Here, we provide the first characterization of crocodilian eggshells, using x-ray micro-CT scans. We studied eggshells of Caiman latirostris and Caiman yacare from various developmental stages that coincide with the beginning of embryonic ossification. The new 3D renderings revealed complex ornamentation, unique among crocodilians, and amphora-shaped pore canals, some of which converge in single pore openings. We also documented a high density of pore canals with a gas diffusion capacity 45 times higher than the average predicted for modern avian eggshells. The external ornamentation and the thickness of the compact layer of the eggshells (i.e. excluding ornamentation) showed ontogenetic and interspecific differences that could be related to nesting materials and nesting areas selected by each species. The shell features described here evidence a greater structural complexity than previously recognized in phylogenetically close, sympatric crocodilian species. Further comprehensive morphological analyses on other modern and fossil crocodilian eggshells using micro-CT technology will shed new light on the evolution of reproductive strategies in this intriguing archosaur clade.

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Indian Late Cretaceous Dinosaur Nesting Sites and Their Systematic Studies

Khosla

Lucas

2020

Topics in Geobiology

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Cambios estructurales en cáscaras de huevos de Caiman latirostris

Cited by 8 publications

References 18 publications

Eggshell structure in Caiman latirostris eggs improves embryo survival during nest inundation

Eggshell structure in Caiman latirostris eggs improves embryo survival during nest inundation

Unexpected morphological variability in the eggshells of the South American caimans Caiman latirostris and Caiman yacare

Indian Late Cretaceous Dinosaur Nesting Sites and Their Systematic Studies

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