Effect of nesting environment on incubation temperature and hatching success of Morelet's crocodile (Crocodylus moreletii) in an urban lake of Southeastern Mexico

López-Luna, Marco A.; Hidalgo‐Mihart, Mircea G.; Aguirre-León, Gustavo; González-Ramón, Mariana del C.; Rangel-Mendoza, Judith A.

doi:10.1016/j.jtherbio.2015.01.006

Cited by 37 publications

(13 citation statements)

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“…This reduces the confidence in the statistics associated with this section (pivotal temperatures and transitional ranges of temperature) as well as the generality of the FMF pattern. A special case was C. moreletii , for which only two studies were available, but the most extensive one presented male‐only clutches, a result possibly due to the amount of pollution in the area (López‐Luna, Hidalgo‐Mihart, Aguirre‐León, González‐Ramón, & Rangel‐Mendoza, ). Because knowledge of the response crocodilian species have to high incubation temperatures will become more relevant under a scenario of higher climate temperatures (Neuwald & Valenzuela, ), it is important that future work focuses on this information gap.…”

Section: Discussionmentioning

confidence: 99%

“…Flow diagram of the study selection in the performed systematic search. The 25 studies included in the models that considered control of temperature were as follows: Ferguson and Joanen (, ), Webb, Manolis, and Buckworth (), Hutton (), Webb, Beal, Manolis, and Dempsey (), Joanen and McNease (), Lang, Andrews, and Whitaker (), Deeming and Ferguson (), Aguilar (), Guillette et al (), Lang and Andrews (), Rhodes and Lang (), Conley et al (), Leslie (), Pinheiro, Mourao, Campos, and Coutinho (), Mohanty‐Hejmadi et al (), Piña et al (), Stoker et al (), Charruau (), Marcó et al (), Elsey and Lang (), Simoncini et al (), López‐Luna et al (), Charruau, Martínez, Cantón, and Méndez de la Cruz () and Marcó et al (). The six studies also included in the models that did not consider control of temperature were as follows: Charruau (), Lance and Bogart (, ), Milnes, Allen, Bryan, Sedacca, and Guillette (), Milnes, Bryan, Medina, Gunderson, and Guillette () and Moore et al ()…”

Section: Methodsmentioning

confidence: 99%

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The sex‐determination pattern in crocodilians: A systematic review of three decades of research

González

Martínez‐López

Morales‐Garduza

et al. 2019

Journal of Animal Ecology

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Sex in crocodilians is not determined by chromosomes, but by egg incubation temperature, where different temperatures produce different clutch sex ratios. Two patterns have been proposed to describe these changes in sex ratios: a 100% female proportion at low and high temperatures with male predominance at intermediate ones (FMF) or a simpler pattern with a single female‐to‐male transition (FM). Over the last three decades, researchers have provided empirical information to support either of these two patterns in different species; however, no consensus has been reached partly because data have not been analysed as a whole. Here, we aimed at gathering the existing data on these patterns to provide models of temperature‐dependent sex determination in those crocodilians studied so far. Potentially relevant publications were searched on Web of Knowledge, Scopus, Scielo and Science Direct. Studies that reported results on the sexual identity of crocodilian hatchlings obtained from constant temperature incubation treatments were considered. Using statistical models varying in their underlying assumptions, we evaluated which sex‐determination pattern was best supported for the studied crocodilians and constructed species‐specific and latitude‐specific models. Based on the 8,458 sexed hatchlings studied throughout 31 studies, we show that the evidence supports a shared FMF pattern in all the crocodilian species for which enough data are available. We find that such pattern changes between species and at different latitudes. These results suggest a lability of the FMF crocodilian sex‐determination pattern, a key feature under the present climate change scenario.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The sex‐determination pattern in crocodilians: A systematic review of three decades of research

González

Martínez‐López

Morales‐Garduza

et al. 2019

Journal of Animal Ecology

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“…Most reptiles have specific microhabitat, temperature and moisture requirements for metabolism and reproduction; they are thus likely to be highly sensitive to climate change (Tuberville et al, 2015). Approximately 85% of reptiles are oviparous (Tinkle and Gibbons, 1977) and may be affected by increasing temperatures during development (Hawkes et al, 2009), potentially skewing the sex ratio for species with temperaturedependent sex determination, reducing hatching success, or shifting breeding season phenology (Hawkes et al, 2009;López-Luna et al, 2015). Other aspects of reptile life-history affected by climate change include altered behaviour patterns such as time spent foraging, basking, or resting (Bickford et al, 2010;Meiri et al, 2013), changes in the use of habitat and resources (Bickford et al, 2010;Scharf et al, 2014), disease (Sarmiento-Ramirez et al, 2014) and altered habitat structure which may also impact prey diversity and abundance (Whitfield et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Hot and bothered: Using trait-based approaches to assess climate change vulnerability in reptiles

Böhm

Cook

et al. 2016

Biological Conservation

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a b s t r a c tOne-fifth of the world's reptiles are currently estimated as threatened with extinction, primarily due to the immediate threats of habitat loss and overexploitation. Climate change presents an emerging slow-acting threat. However, few IUCN Red List assessments for reptiles explicitly consider the potential role of climate change as a threat. Thus, climate change vulnerability assessments can complement existing Red List assessments and highlight further, emerging priorities for conservation action.Here we present the first trait-based global climate change vulnerability assessment for reptiles to estimate the climate change vulnerability of a random representative sample of 1498 species of reptiles. We collected speciesspecific traits relating to three dimensions of climate change, sensitivity, low adaptability, and exposure, which we combined to assess overall vulnerability. We found 80.5% of species highly sensitive to climate change, primarily due to habitat specialisation, while 48% had low adaptability and 58% had high exposure. Overall, 22% of species assessed were highly vulnerable to climate change. Hotspots of climate change vulnerability did not always overlap with hotspots of threatened species richness, with most of the vulnerable species found in northwestern South America, southwestern USA, Sri Lanka, the Himalayan Arc, Central Asia and southern India. Most families were found to be significantly more vulnerable to climate change than expected by chance. Our findings build on previous work on reptile extinction risk to provide an overview of the risk posed to reptiles by climate change. Despite significant data gaps for a number of traits, we recommend that these findings are integrated into reassessments of species' extinction risk, to monitor both immediate and slow-acting threats to reptiles.

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“…Previous studies have successfully deployed similar data loggers with built in sensors and data storage (López-Luna et al, 2015;González-Desales et al, 2016;Murray et al, 2016). However, these projects did not experience the same apparent level of instrument loss (Charruau, 2012).…”

Section: Discussionmentioning

confidence: 99%

Crocodylus acutus (American crocodile) bite marks on a nest data logger

Drumheller

Nestler

Farris

et al. 2020

PeerJ

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Several data loggers deployed to monitor temperature and humidity of Crocodylus acutus (American crocodile) nests in South Florida could not be located after hatching. One badly damaged data logger was retrieved, providing insight into the possible fate of the others. Using a taphonomic approach, we identified numerous indentations, consistent with crocodylian bite marks, and inconsistent with potential mammalian or squamate bites. It seems most likely that the data logger was damaged by the nesting C. acutus rather than during attempted nest predation. Estimated bite forces for reproductive age, female C. acutus exceed the predicted material properties of the data logger’s housing, suggesting that the bites were exploratory in nature. We suggest that data loggers be removed prior to hatching or permit remote data storage.

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Effect of nesting environment on incubation temperature and hatching success of Morelet's crocodile (Crocodylus moreletii) in an urban lake of Southeastern Mexico

Cited by 37 publications

References 41 publications

The sex‐determination pattern in crocodilians: A systematic review of three decades of research

The sex‐determination pattern in crocodilians: A systematic review of three decades of research

Hot and bothered: Using trait-based approaches to assess climate change vulnerability in reptiles

Crocodylus acutus (American crocodile) bite marks on a nest data logger

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