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35 results for “hatching success”

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zenodo40/100

Thermal regimes and hatching success related data for wild king cobra nests from the Western Himalayas, Uttarakhand, India

This dataset, collected between 2009-2020, describes the thermal regimes of wild king cobra nests from the foothills of the Western Himalayas of Uttarakhand, northern India. Nest and ambient temperatures at nest sites were recorded every hour via automatic data loggers during, mostly, the latter part of incubation period (post natural nest-abandonment by female king cobras). Nest attributes (e.g. size, weight etc.) and hatching success parameters (i.e. percentage of hatched eggs and offspring size) are also provided per nest. All uploaded data have been analyzed in the paper: "House warming: wild king cobra nests have thermal regimes that positively affect hatching success and hatchling size" by Dolia et al. (currently under review in Journal of Thermal Biology.)

opencc-by-4.0Nov 2022View details →

dryad36/100

Data from: To hatch and hatch not: Rejecting the hypothesis that heterochrony in vestibular mechanosensing explains poor escape-hatching success of Agalychnis spurrelli in snake attacks compared with its congener A. callidryas

Phyllomedusid treefrogs hatch prematurely to escape egg predation, but escape success varies among species. During spontaneous hatching of Agalychnis spurrelli, snake attacks elicited 55% less escape-hatching than did attacks on less developed A. callidryas. Agalychnis callidryas use their vestibular system and, secondarily, their lateral line to sense physical disturbances that cue hatching. Since A. spurrelli develop faster, we hypothesized that heterochronic shifts in the onset timing of vestibular mechanosensory function, relative to hatching ability, might explain their lower escape response to mechanosensory cues. To test this, we compared the onset timing of hypoxia- and mechanosensory-cued hatching (MCH) and vestibular mechanosensory function in developmental series of A. spurrelli and A. callidryas embryos. Across species, most sibships began responding to each cue at the same developmental stage. MCH onset in A. spurrelli was associated with vestibular function onset, as indicated by measurements of the vestibulo-ocular reflex (VOR). Indeed, the first A. spurrelli embryos to show MCH had VOR amplitudes similar to those previously found for A. callidryas at the onset of MCH. These results indicate that low escape-hatching success in A. spurrelli is not caused by a relative delay in the onset of vestibular mechanosensory function, rejecting our initial hypothesis; the developmental timing of vestibular mechanosensing and its role in predator-induced hatching appears conserved. Our observations of both higher escape success of larger clutches in snake attacks and hatching complications in flooded A. spurrelli suggest, instead, that differences in egg capsule and clutch structure may contribute to species differences in escape-hatching success.

opencc-zeroDec 2023View details →

dryad36/100

Data from: Paternal hatching care regulates the timing, synchrony, and success of hatching in a coral reef fish

In oviparous species, the timing of hatching is a crucial decision, but for developing embryos, assessing cues that indicate the optimal time to hatch is challenging. In species with parental care, parents can assess environmental conditions and induce their offspring to hatch. We provide the first documentation of parental hatching regulation in a coral reef fish, demonstrating that male neon gobies (Elacatinus colini) directly regulate hatching by removing embryos from the clutch and spitting hatchlings into the water column. All male gobies synchronized hatching within 2h of sunrise, regardless of when eggs were laid. Paternally-incubated embryos hatched later in development, more synchronously, and had higher hatching success than artificially-incubated embryos that were shaken to simulate paternal hatching cues or not stimulated. Artificially-incubated embryos displayed substantial plasticity in hatching times (range: 88 – 244 hours post-fertilization), suggesting that males could respond to environmental heterogeneity by modifying the hatching time of their offspring. Finally, paternally-incubated embryos hatched with smaller yolk sacs and larger propulsive areas than artificially-incubated embryos, suggesting that paternal effects on hatchling phenotypes may influence larval dispersal and fitness. These findings highlight the complexity of fish parental care and may have important, and currently unstudied, consequences for fish population dynamics.

opencc-zeroSep 2022View details →

dryad36/100

Data from: Optimising the hatching success of artificially incubated eggs for use in a conservation program for the western saw-shelled turtle (Myuchelys bellii)

Artificial incubation of eggs and the release of hatchlings into the wild is a common conservation intervention designed to augment threatened turtle populations. We investigate a range of incubation temperatures to establish an optimal temperature for maximum hatching success of western saw-shelled turtle (Myuchelys bellii) eggs. We report on the influence of incubation temperature on incubation duration and hatching success and describe two experimental incubation methods which, for the same incubation temperature, resulted in 77% and 97% hatching success, respectively. Eggs were incubated at constant temperatures (27°C, 28°C and 29°C) to determine the influence of temperature on incubation period, hatchling morphology and external residual yolk. Incubation duration was negatively correlated with incubation temperature. We report on the morphology of eggs and hatchlings and show that their dimensions are positively correlated with maternal adult size and mass. A constant incubation temperature of 27°C produced the highest hatching success and smallest external residual yolk on hatching and is therefore recommended for incubation of eggs for population reinforcement programs. Our study is the first to optimise artificial incubation procedures for M. bellii and will be a valuable resource for M. bellii and other threatened freshwater turtle conservation initiatives.

opencc-zeroOct 2022View details →

dryad36/100

Developmental changes in red-eyed treefrog embryo behavior increase escape-hatching success in wasp attacks

The arboreal embryos of red-eyed treefrogs (Agalychnis callidryas) hatch prematurely to escape from egg-predators, and escape success increases with age. We assessed developmental changes in the behavior and hatching performance of embryos attacked by wasps (Polybia rejecta) and their contributions to improved embryo survival. We recorded videos of 4- and 5-day-old embryos exposed to wasp attacks and determined each embryo's fate. For a stratified random sample of embryos that escaped and died, we determined the occurrence, sequence, and timing of events during wasp-embryo interactions. We constructed path diagrams of event sequences, tested for age effects on transition probabilities, and measured durations of periods between key events. Overall escape success was 38% higher in older embryos. They were more likely to hatch pre-emptively than younger ones, thus less likely to experience direct attacks, suggesting that developmental gains in mechanosensory sensitivity may increase hatching responses to indirect cues. During direct attacks, embryos were equally likely to be captured by wasps at both ages and hatching speed was similar, suggesting no relevant difference in escape-hatching performance. After a wasp ruptured their egg capsule, older embryos were more likely to exit and did so much sooner; younger embryos remained in ruptured capsules for longer and were more likely to be attacked again. This developmental change in embryo behavior indicates decreased tolerance for egg-stage risk as the chance of tadpole survival increases, suggesting that ontogenetic adaptation to changing risk trade-offs contributes strongly to the developmental increase in escape success.

opencc-zeroMar 2023View details →

dryad36/100