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12 results for “temperature-dependent sex determination”
Data from: The thermal sensitivity of growth and survival in a wild reptile with temperature-dependent sex determination
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Adult sex-ratio bias does not lead to detectable adaptive offspring sex allocation via nest-site choice in a turtle with temperature-dependent sex determination
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Data from: Differential early-life survival underlies the adaptive significance of temperature-dependent sex determination in a long-lived reptile
<p><span class="normaltextrun"><span>Many ectotherms rely on temperature cues experienced during development to determine offspring sex. The first descriptions of temperature-dependent sex determination (TSD) were made over 50 years ago, yet an understanding of its adaptive significance remains elusive, especially in long-lived taxa. </span></span><span class="normaltextrun"><span>One novel hypothesis predicts that TSD should be evolutionarily favored when two criteria are met – (a) incubation temperature influences annual juvenile survival and (b) sexes mature at different ages. Under these conditions, a sex-dependent effect of incubation temperature on offspring fitness arises through differences in age at sexual maturity, with the sex that matures later benefiting disproportionately from temperatures that promote juvenile survival.</span></span><span class="eop"><span><span> </span></span></span><span class="normaltextrun"><span>The American alligator (<em>Alligator mississippiensis</em>) serves as an insightful model in which to test this hypothesis, as males begin reproducing nearly a decade after females. Here, through a combination of artificial incubation experiments and mark-recapture approaches, we test the specific predictions of the survival-to-maturity hypothesis for the adaptive value of TSD by disentangling the effects of incubation temperature and sex on annual survival of alligator hatchlings across two geographically distinct sites.</span></span><span class="normaltextrun"><span><span> </span></span></span><span class="normaltextrun"><span>Hatchlings incubated at male-promoting temperatures consistently exhibited higher survival compared to those incubated at female-promoting temperatures. This pattern appears independent of hatchling sex, as females produced from hormone manipulation at male-promoting temperatures exhibit similar survival to their male counterparts.</span></span><span class="normaltextrun"><span><span> </span></span></span><span class="normaltextrun"><span>Additional experiments show that incubation temperature may affect early-life survival primarily by affecting the efficiency with which maternally transferred energy resources are used during development. </span></span><span class="normaltextrun"><span>Results from this study provide the first explicit empirical support for the adaptive value of TSD in a crocodilian <span>and point to developmental energetics as a potential unifying mechanism underlying persistent survival consequences of incubation temperature.</span></span></span></p>
Brief exposure to warm temperatures reduces intron retention in Kdm6b in a species with temperature-dependent sex determination
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Data from: Differential early-life survival underlies the adaptive significance of temperature-dependent sex determination in a long-lived reptile
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Maternal provisioning and fluctuating thermal regimes enhance immune response in a reptile with temperature-dependent sex determination
<p>The Charnov-Bull model of differential fitness is often used to explain the evolution and maintenance of temperature-dependent sex determination (TSD). Most tests of the model focus on morphological proxies of fitness, such as size traits, whereas early life physiological traits that are closely related to lifetime fitness might provide a framework for generalising the Charnov-Bull model across taxa. One such trait is the strength of early life immune response, which is strongly linked to early life survival and fitness. Here, we manipulate temperature, variance in temperature, and sex to test the Charnov-Bull model using a physiological trait, immune system strength, in the snapping turtle (<i>Chelydra serpentina </i>L. 1758). We find no evidence of sex-specific differences in bactericidal capacity of hatchling blood, and no evidence that mean temperature influences bactericidal capacity. However, we find that fluctuating incubation temperature (i.e., a more naturalized incubation regime) is associated with a greater bactericidal capacity compared to constant temperature incubation. We also find that egg mass, a proxy for maternal provisioning, is positively associated with bactericidal capacity. Our findings suggest that the evolution of temperature-dependent sex determination in reptiles is unrelated to our measure early-life innate immunity. Our study also underlines how immune response is condition-dependent in early life, and questions the biological relevance of constant temperature incubation in experimental studies on ectotherm development.</p>
Data from: Conservation of sex-linked markers among conspecific populations of a viviparous skink, Niveoscincus ocellatus, exhibiting genetic and temperature-dependent sex determination
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Data from: Maternal nesting behaviour in city dragons: a species with temperature-dependent sex determination
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Maternal provisioning and fluctuating thermal regimes enhance immune response in a reptile with temperature-dependent sex determination
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Data from: Thyroid hormone modulates offspring sex ratio in a turtle with temperature-dependent sex determination
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Identification of candidate genes associated with temperature-dependent sex determination of Reeves' Turtle (Mauremys reevesii) by genome-wide transcriptome analysis
GEO Series GSE98234. Mauremys reevesii. 9 samples. Type: Expression profiling by high throughput sequencing.
Identification and characterization of miRNAs in temperature-dependent sex determination (TSD) of Chinese pond turtles (Mauremys reevesii)
GEO Series GSE92957. Mauremys reevesii. 3 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.