ABSTRACT Tools to discriminate products from captive and wild sources will improve wildlife sustainability, stable isotopes of carbon nitrogen can be potentially useful for this. In this study, we evaluated δ 15 N 13 C in Caiman latirostris skins individuals (from Argentina Brazil), Argentina), leathers tanned skins) both Argentina). addition, compared the isotopic signatures caiman claws caimans Brazil. The main goal study was evaluate possible differences variability between skins,...

Temperature-dependent sex-determination has been reported for all extant crocodilians. We present information about incubation temperature effects on period, sex ratio, hatching success, and hatchling survivorship during the first year of life Caiman latirostris. Incubation period was negatively related to temperature. Sex hatchlings were Only females produced at 29°C 31°C, only males 33°C, both hatched 34.5°C. Hatching success unaffected by

The basis of fructophily in the yeast Zygosaccharomyces bailii has been shown to reside performance transport systems for hexoses. In this study, a gene encoding fructose-specific transporter was characterized. strategy involved functional complementation Saccharomyces cerevisiae strain that does not take up hexoses ( hxt-null strain). This transformed with genomic library Z. . One transformant capable growing on fructose, but glucose, obtained. did d -[ 14 C]glucose, and kinetic parameters...

Abstract A standard development embryological series is the primary basis to organize information of any study and also used determine age eggs embryos in field conditions. In this article, we calibrate developmental broad‐snouted caiman, Caiman latirostris , against an established for Alligator mississippiensis . Morphometric measures extend opaque‐shell banding were related embryo age. earlier stages, external morphological features alone can account age, but suggest that morphometric...

Abstract Reproductive aspects, like number of nests produced per season or clutch size (number eggs nest), broad-snouted caiman ( Caiman latirostris ) may be affected by a climatic variables such as rainfall and temperature. The success reproduction is not only the amount rainfall, but also time elapsed during which it takes place. In this study, we present evidence positive relationship between precipitation on water heads (“Bajos Submeridionales”) March. Surprisingly, there was significant...

Abstract C aiman latirostris has temperature‐dependent sex determination and is potentially susceptible to environmental temperature fluctuations and, thus, the global climate change phenomena. Considering potential consequences of increasing temperatures for a. offspring, we examined effects climatic conditions on ratios produced by caimans in wild nests particular how variables affect nest percentage females produced. We also explored a hypothetic 0.5 1.0°C increase caiman populations. The...

We studied 20 nesting female Caiman latirostris and their clutches in Santa Fe Province, Argentina. regressed clutch egg parameters hatchling size with several measurements of (ln-transformed) to evaluate the allometry reproduction wild. Larger females produced relatively smaller clutches. larger eggs hatchlings. Egg width, not length, limits relative body size. Future studies should address relationship between fecundity fitness.

Abstract Detecting multiple paternity in wild populations of the broad‐snouted caiman ( Caiman latirostris ) has important implications for conservation efforts. We have applied microsatellite markers to examine genetic variation C. and also provided first data concerning detection this species. Blood samples from four nest‐guarding females their hatchlings were obtained Santa Fe Province, Argentina. Amplified products analyzed by electrophoresis on 10% polyacrylamide gels visualized with...

Biogenic structures, herein interpreted as coprolites, were recorded in the ?upper Paleocene–Eocene Las Flores Formation, southeast Argentina. The coprolite origin is supported by several features, such recurrent extrusive external morphology, longitudinal wrinkles, flattening of ventral side, concentric and radial cracks, cryptocrystalline groundmass, a phosphatic composition. A detailed comparative study with modern fecal masses, based on surface texture, micromorphology, mineralogical...

We investigated the effects of incubation temperature (29°C, 31°C, and 33°C) on total length (TL) body mass (BM) Caiman latirostris, a crocodilian with temperature-dependent sex determination (TSD), at hatching (N = 180) in sample hatchlings 40) after one year raising. Size was strongly clutch-specific. Animals incubated 31°C (100% females) were larger than 29°C female) 33°C males). Absolute growth to higher for females (eggs 31°C) males 33°C). The possibility that constant had compromised...

The southern distribution of the Broad-snouted Caiman (Caiman latirostris Daudin 1802) in Argentina occurs Santa Fe Province, where its population has been under management by "Proyecto Yacaré" since 1990. From 1997 to 2016, we captured 77 nesting female Caimans Province. Our results suggest that previously defined size classes for do not adequately describe reproductively mature segment population. Here propose change ranges general Caiman. In addition, have observed reintroduced...

Abstract The Vulnerable marsh deer Blastocerus dichotomus , the largest native cervid in South America, is declining throughout its range as a result of conversion wetlands and overhunting. Estimated densities open several types are 0.1–6.8 individuals per km 2 . We undertook first unmanned aerial vehicle (UAV) survey to estimate density this species 113.6 area under forestry management lower delta Paraná River, Argentina. During 6–8 August 2019, at time year when canopy cover minimal, we...

The relationship between nesting habitat and hatching success in Caiman latirostris (Crocodylia, Alligatoridae).The Broad-snouted uses different habitats for nesting; it has temperature-dependent sex determination (TSD) selection by females could affect other hatchlings characteristics.Here we evaluated reproductive parameters three habitats: forest, savanna, floating vegetation.We collected 154 caiman nests during the summer of 2001-2002.Since natural incubation mask possible...

Egg inundation often results in poor hatching success crocodylians. However, how tolerant eggs are to submergence, and/or eggshell ultrastructure may affect embryo survival when inundated, not well understood. In this study, our objective was determine if Caiman latirostris is affected by surface roughness, submerged under water. Tolerance tested early (day 30) versus late 60) development, using eight clutches (four per time treatments), subdivided into four groups: ( N = 9 clutch treatment;...

Although there is much information available about reproduction in Caiman latirostris, knowledge related to steroid hormone levels and follicle development for wild adult females still lacking. In this study we monitored assessed the of follicles eggs correlated these results with plasma 32 captured Santa Fe, Argentina. Fieldwork was carried out over two reproductive seasons (October–January) between 2010 2012. Using an ultrasound device take images structures females, observed individuals...

The sustainable use of wildlife is considered a tool for conservation in addition to generating benefits the local population. Commercial reptile hunting targets skins, other by-products such as meat and fat. Meat from hunted reptiles widely available localities where management plans are place evaluated easily accessible hunters their families. objective our research was evaluate percent composition, protein composition microbiological quality black white tegu yellow anaconda meat. For this...