Relevant bibliographies by topics / Crocodile hatchlings

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Academic literature on the topic 'Crocodile hatchlings'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Crocodile hatchlings"

1

Hénaut, Yann, and Pierre Charruau. "Nest attendance and hatchling care in wild American crocodiles (Crocodylus acutus) in Quintana Roo, Mexico." Animal Biology 62, no. 1 (2012): 29–51. http://dx.doi.org/10.1163/157075511x597629.

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AbstractCrocodilians show universal parental care, but few studies concentrate on this behavior in wild crocodiles. We studied nest and hatchling care in genetically pure wild American crocodiles (Crocodylus acutus) on two Caribbean islands of Mexico. From 2006 to 2009 we made direct observations of crocodile behavior upon discovery of nests and groups of hatchlings in Banco Chinchorro. In 2009, we installed camera traps at 4 nests from the time of their discovery to the hatching of each nest, in Banco Chinchorro and Cozumel Island. Twenty-one other species were observed to visit crocodile nests. No nest predation was observed but nine species represented some danger to nests and/or hatchlings. Females seemed to remain in the nest vicinity during incubation. There was variability in nest visit frequencies and no nest defense toward human intrusion was observed. Visit frequency by other species at nests decreased with increased crocodile visitation. Crocodiles mainly visited nests on darker nights, corresponding to the visits of species representing greater danger for nests. Repair of the nest by females after disturbance was observed for the first time in wild American crocodiles. Crocodile visits were more frequent at the beginning and the end of incubation, which could represent different antipredation strategies. Although adult crocodiles helped during hatching for the emergence of neonates, hatchling care seemed reduced compared to other crocodile species. We provide the first data on nesting behavior of genetically pure American crocodiles in the Yucatan peninsula, which provides a base for future comparisons with Morelet's crocodiles and their hybrids.
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2

Read, Mark A., Jeffrey D. Miller, Ian P. Bell, and Adam Felton. "The distribution and abundance of the estuarine crocodile, Crocodylus porosus, in Queensland." Wildlife Research 31, no. 5 (2004): 527. http://dx.doi.org/10.1071/wr02025.

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A total of 6444 Crocodylus porosus (4303 non-hatchlings and 2141 hatchlings) were recorded during 196 vessel-based surveys of 103 waterways to determine the distribution and abundance of Crocodylus porosus in Queensland. The surveys, conducted from January 1994 to December 2000, covered 4174.3 km of waterway. Population structure was biased towards immature crocodiles, with 91% of all animals sighted being less than the minimum breeding size for individuals in the Northern Territory. The mean relative density of non-hatchling C. porosus was highest in waterways of north-western Cape York Peninsula and Lakefield National Park, and lowest for waterways along the populated east coast of Queensland. The highest numbers of hatchlings were recorded from waterways of north-western Cape York Peninsula, where nearly 74% of all hatchlings were recorded during the seven-year survey period. The C. porosus population in northern Queensland appears to be undergoing a limited recovery, with marginal increases in the mean relative density of non-hatchlings in seven of the eight crocodile biogeographic regions. On the basis of the distribution and abundance of hatchling and non-hatchling crocodiles, the north-western Cape York Peninsula region contains the best habitat for C. porosus in Queensland, particularly in the Wenlock River and Tentpole Creek area.
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Briggs-Gonzalez, Venetia S., Mathieu Basille, Michael S. Cherkiss, and Frank J. Mazzotti. "American crocodiles (Crocodylus acutus) as restoration bioindicators in the Florida Everglades." PLOS ONE 16, no. 5 (May 19, 2021): e0250510. http://dx.doi.org/10.1371/journal.pone.0250510.

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The federally threatened American crocodile (Crocodylus acutus) is a flagship species and ecological indicator of hydrologic restoration in the Florida Everglades. We conducted a long-term capture-recapture study on the South Florida population of American crocodiles from 1978 to 2015 to evaluate the effects of restoration efforts to more historic hydrologic conditions. The study produced 10,040 crocodile capture events of 9,865 individuals and more than 90% of captures were of hatchlings. Body condition and growth rates of crocodiles were highly age-structured with younger crocodiles presenting with the poorest body condition and highest growth rates. Mean crocodile body condition in this study was 2.14±0.35 SD across the South Florida population. Crocodiles exposed to hypersaline conditions (> 40 psu) during the dry season maintained lower body condition scores and reduced growth rate by 13% after one year, by 24% after five years, and by 29% after ten years. Estimated hatchling survival for the South Florida population was 25% increasing with ontogeny and reaching near 90% survival at year six. Hatchling survival was 34% in NE Florida Bay relative to a 69% hatchling survival at Crocodile Lake National Wildlife Refuge and 53% in Flamingo area of Everglades National Park. Hypersaline conditions negatively affected survival, growth and body condition and was most pronounced in NE Florida Bay, where the hydrologic conditions have been most disturbed. The American crocodile, a long-lived animal, with relatively slow growth rate provides an excellent model system to measure the effects of altered hydropatterns in the Everglades landscape. These results illustrate the need for continued long-term monitoring to assess system-wide restoration outcomes and inform resource managers.
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4

Ouedraogo, Ilassa, Idrissa Ouedraogo, Noëllie W. Kpoda, Adama Oueda, Victor Bance, Justine Kabore, and Gustve B. Kabre. "Impact of road construction on the distribution of Crocodylus suchus (Étienne Geoffroy Saint-Hilaire 1807) in urban park Bangr-Weoogo (Burkina Faso)." International Journal of Biological and Chemical Sciences 14, no. 2 (May 11, 2020): 390–401. http://dx.doi.org/10.4314/ijbcs.v14i2.7.

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In contrast to other anthropogenic activities, little is known about impact of road construction on reptile’s distribution in urban areas. Therefore, the present study aimed at quantifying impact of road construction on C. suchus distribution. It was conducted from February 2016 to May 2018, in the urban Park Bangr-weoogo. C. suchus populations were counted day by used binoculars pairs and night by spotlight. The different observations were carried on foot. Every time, we observed crocodile, we visually estimate its size class. When we couldn’t appreciate the size of an individual, it was just noted as eyes only. About road works, direct observations have been done and noted. To have mapping of the dynamics of crocodile habitats in the park, aerial shots were taken during road construction. We used QGIS version 2.18.2 to establish map distribution of crocodiles. A total of 145 crocodiles including 10.34% of hatchlings, 17.93% of juveniles, 31.03% of subadults and 24.14 of adults were counted before road works. While during road work, 202 crocodiles were counted, whose 5.45% of hatchlings, 19.8% of juveniles, 30.69% of subadults and 37.62% of adults. Road work has led to a loss of crocodile habitat.Keywords: Protected area, habitat, abundance.
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5

Untari, Dewi, Hardjanto Hardjanto, Bramasto Nugroho, and Rinekso Soekmadi. "Patterns and Trends of Crocodile Trade from Tanah Papua, Indonesia." Forest and Society 4, no. 1 (April 26, 2020): 209. http://dx.doi.org/10.24259/fs.v4i1.9058.

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Crocodylus porosus and C. novaeguineae are two protected and tradable crocodile species in Indonesia. Therefore, precautionary principles are needed in their utilization to ensure sustainability. Although the commodity from these species is traded domestically and internationally, the broader picture of its use in Indonesia is less known. The objectives of the study were to: (1) analyze the domestic trade of crocodiles, and (2) analyze the international trade of crocodiles. The analysis was conducted using data of direct utilization sourced from the wild in the form of skin and hatchlings, data on domestic transport permits, CITES export permits, and the CITES trade database. The study suggested that the harvest of crocodile hatchlings and skin do not represent the actual condition since the skin recorded were only those sent outside of the province. Determining zero harvest quotas of C. porosus did not stop species harvest for domestic trade. The dominant source of C. porosus skin export was captive breeding, while C. novaeguineaewas sourced from the wild. Ranch-sourced skin of both species for export were very low.
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6

Habarugira, Gervais, Jasmin Moran, Agathe M. G. Colmant, Steven S. Davis, Caitlin A. O’Brien, Sonja Hall-Mendelin, Jamie McMahon, et al. "Mosquito-Independent Transmission of West Nile virus in Farmed Saltwater Crocodiles (Crocodylus porosus)." Viruses 12, no. 2 (February 11, 2020): 198. http://dx.doi.org/10.3390/v12020198.

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West Nile virus, Kunjin strain (WNVKUN) is endemic in Northern Australia, but rarely causes clinical disease in humans and horses. Recently, WNVKUN genomic material was detected in cutaneous lesions of farmed saltwater crocodiles (Crocodylus porosus), but live virus could not be isolated, begging the question of the pathogenesis of these lesions. Crocodile hatchlings were experimentally infected with either 105 (n = 10) or 104 (n = 11) TCID50-doses of WNVKUN and each group co-housed with six uninfected hatchlings in a mosquito-free facility. Seven hatchlings were mock-infected and housed separately. Each crocodile was rotationally examined and blood-sampled every third day over a 3-week period. Eleven animals, including three crocodiles developing typical skin lesions, were culled and sampled 21 days post-infection (dpi). The remaining hatchlings were blood-sampled fortnightly until experimental endpoint 87 dpi. All hatchlings remained free of overt clinical disease, apart from skin lesions, throughout the experiment. Viremia was detected by qRT-PCR in infected animals during 2–17 dpi and in-contact animals 11–21 dpi, indicating horizontal mosquito-independent transmission. Detection of viral genome in tank-water as well as oral and cloacal swabs, collected on multiple days, suggests that shedding into pen-water and subsequent mucosal infection is the most likely route. All inoculated animals and some in-contact animals developed virus-neutralizing antibodies detectable from 17 dpi. Virus-neutralizing antibody titers continued to increase in exposed animals until the experimental endpoint, suggestive of persisting viral antigen. However, no viral antigen was detected by immunohistochemistry in any tissue sample, including from skin and intestine. While this study confirmed that infection of saltwater crocodiles with WNVKUN was associated with the formation of skin lesions, we were unable to elucidate the pathogenesis of these lesions or the nidus of viral persistence. Our results nevertheless suggest that prevention of WNVKUN infection and induction of skin lesions in farmed crocodiles may require management of both mosquito-borne and water-borne viral transmission in addition to vaccination strategies.
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7

Hossain, Md Sakhawat, M. Firoj Jaman, Mushtaq Ahmed, Md Mokhlesur Rahman, and Mayen Uddin. "Food consumption of saltwater crocodile (Crocodylus Porosus) in a reptile farm of Bangladesh." Bangladesh Journal of Zoology 41, no. 2 (May 13, 2015): 173–79. http://dx.doi.org/10.3329/bjz.v41i2.23319.

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An extensive study was conducted on food consumption and feeding behavior of saltwater crocodile (Crocodylus porosus) in the Reptiles Farm Ltd. (RFL) located at Hatiber village, Bhaluka, Mymensingh. The study was mainly based on direct observation and previous data collected by the technicians of the RFL. Average temperature (0C) in the farm area was significantly correlated with average food consumption (g) of the hatchlings (r = 0.714, p<0.05, n = 12). The average temperature and the average food consumption were highest in August and it was 30.5 ±5.5 0C and 45.02 ±13.05 g, respectively. Monthly feeding of hatchlings was different in three individual tubs. The highest food consumption was in August although; hatchery’s temperature was constant (320C). Crocodilians can increase their level of consumption during warmer months of the year while decreasing it in the cooler months. The highest quantity of food was given in October, probably for accumulation of fat in their body which would provide energy in the whole winter season. A total of 93.1 kg provisioned food was supplied to an adult crocodiles per year. Food consumption of crocodile is temperature dependent and the potentiality of crocodile farming is embedded in it, by considering this factor it may gain prosperity of crocodile farming in our country.Bangladesh J. Zool. 41(2): 173-179, 2013
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8

Rauhut, Oliver W. M., and Regina Fechner. "Early development of the facial region in a non-avian theropod dinosaur." Proceedings of the Royal Society B: Biological Sciences 272, no. 1568 (May 24, 2005): 1179–83. http://dx.doi.org/10.1098/rspb.2005.3071.

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An isolated maxilla of the theropod dinosaur Allosaurus from the Late Jurassic (the Kimmeridgian, 153 million years ago) of Portugal is the first cranial remain of a non-coelurosaurian theropod hatchling reported so far, and sheds new light on the early cranial development of non-avian theropods. Allosaurus hatchlings seem to have been one-seventh or less of the adult length and are thus comparable in relative size to hatchlings of large extant crocodile species, but are unlike the relatively larger hatchlings in coelurosaurs. The snout experienced considerable positive allometry and an increase in tooth count during early development. The element is especially noteworthy for the abundant and well-developed features associated with the paranasal pneumatic system. Pneumatic structures present include all those found in adult allosaurids and most are even more developed than in adult skulls. Together with evidence on the ontogeny of the tympanic pneumatic system in allosaurids, these findings demonstrate that cranial pneumaticity developed early in theropod ontogeny. The strong development of pneumatic features in early ontogenetic stages of non-avian theropods supports the hypothesis that pneumatization of cranial bones was opportunistic and indicates that heterochrony played an important role in the evolution of craniofacial pneumaticity in this group.
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9

ARIEL, E., PW LADDS, and GN BUENVIAJE. "Concurrent gout and suspected hypovitaminosis A in crocodile hatchlings." Australian Veterinary Journal 75, no. 4 (April 1997): 247–49. http://dx.doi.org/10.1111/j.1751-0813.1997.tb10089.x.

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10

Palei, Nimain Charan, Bhakta Padarbinda Rath, and Bimal Prasanna Acharya. "An observation of the White-bellied Sea Eagle Haliaeetus leucogaster preying on Saltwater Crocodile hatchlings Crocodylus porosus in Bhitarkanika Wildlife Sanctuary, India." Journal of Threatened Taxa 11, no. 13 (October 26, 2019): 14767–69. http://dx.doi.org/10.11609/jott.4916.11.13.14767-14769.

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During our regular monitoring of Salt Water Crocodile in Bhitarakanika National Park in Odisha, eastern India, we for the first time photographed the predation of a hatchling Salt Water Crocodile by a White-bellied Sea Eagle. This information is very crucial as it aid in understanding the natural history of the species.
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Dissertations / Theses on the topic "Crocodile hatchlings"

1

Jamerlan, Mona Lisa. "Establishing mating systems by microsatellite analysis in declining saltwater crocodile (Crocodylus porosus) hatchling production at Edward River Crocodile Farm (Nth. Queensland) /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17070.pdf.

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