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Zarco–gonzález M. M. - One of the best experts on this subject based on the ideXlab platform.
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Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México
Museu de Ciències Naturals de Barcelona, 2016Co-Authors: González–desales G. A., Monroy–vilchis O., Charruau P., Zarco–gonzález M. M.Abstract:Ecological aspects of nesting in Caiman Crocodilus chiapasius (Bocourt 1876) in La Encrucijada Biosphere Reserve, Mexico Studies on Caiman, Caiman Crocodilus chiapasius, in Mexico are scarce. The present study was conducted to evaluate the key characteristics regarding the reproductive ecology of Caiman in Mexico. We conducted nest searches from April to September 2014. We observed that nests were built in June and that hatching occurred in September and October. The phase of the moon had an effect on nesting events. The height of the nest, the distance to the nearest tree, and the distance from the top of the nest to the first egg were related to hatching success and incubation temperature
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Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México
'Consorci del Museu de Ciencies Naturals de Barcelona', 2016Co-Authors: González–desales G. A., Monroy–vilchis O., Charruau P., Zarco–gonzález M. M.Abstract:Existen pocos estudios sobre el caimán de anteojos, Caiman Crocodilus chiapasius, realizados en México. En el presente estudio evaluamos las características clave de la ecología reproductiva del caimán en México. Se realizó una búsqueda de nidos entre abril y septiembre de 2014, y se observó que la construcción de los mismos tiene lugar en junio y las eclosiones, en septiembre y octubre. La fase lunar influye en la anidación. Asimismo, la altura del nido, la distancia al árbol más cercano y la distancia desde el borde superior del nido al primer huevo están relacionadas con el éxito de eclosión y la temperatura de incubación.Ecological aspects of nesting in Caiman Crocodilus chiapasius (Bocourt 1876) in La Encrucijada Biosphere Reserve, Mexico Studies on Caiman, Caiman Crocodilus chiapasius, in Mexico are scarce. The present study was conducted to evaluate the key characteristics regarding the reproductive ecology of Caiman in Mexico. We conducted nest searches from April to September 2014. We observed that nests were built in June and that hatching occurred in September and October. The phase of the moon had an effect on nesting events. The height of the nest, the distance to the nearest tree, and the distance from the top of the nest to the first egg were related to hatching success and incubation temperature.Existen pocos estudios sobre el caimán de anteojos, Caiman Crocodilus chiapasius, realizados en México. En el presente estudio evaluamos las características clave de la ecología reproductiva del caimán en México. Se realizó una búsqueda de nidos entre abril y septiembre de 2014, y se observó que la construcción de los mismos tiene lugar en junio y las eclosiones, en septiembre y octubre. La fase lunar influye en la anidación. Asimismo, la altura del nido, la distancia al árbol más cercano y la distancia desde el borde superior del nido al primer huevo están relacionadas con el éxito de eclosión y la temperatura de incubación
Gisela Garcia C C - One of the best experts on this subject based on the ideXlab platform.
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caracteristicas anatomicas del aparato genital masculino del Caiman Crocodilus Crocodilus
Revista de la Facultad de Ciencias Veterinarias UCV, 2013Co-Authors: Francisco Cabrera J A, Gisela Garcia C CAbstract:Se realizo la descripcion anatomica del aparato genital masculino de nueve babas adultas salvajes (Caiman Crocodilus Crocodilus), mediante tecnicas clasicas de necropsia. Los hallazgos mas importantes fueron: confirmacion de ausencia de glandulas genitales accesorias y presencia de un organo copulador semejante en estructura al de los mamiferos, con un cuerpo del pene libre, de forma cilindrica y convexa, en cuya superficie dorsal se encuentra un surco eyaculador compuesto de tejido erectil, capaz de transformarse en un conducto analogo de la uretra peneana de los mamiferos. Esta estructura anatomica puede brindar a esta especie algunas ventajas en la fisiologia de la copula sobre otros cocodrilidos de los llanos venezolanos. Anatomical Characteristics of the Male Genital Tract of the Caiman Crocodilus Crocodilus ABSTRACT The anatomical description of the male genital apparatus was carried out on nine wild mature spectacled Caiman (Caiman Crocodilus Crocodilus), by means of classic necropsy techniques. The most important findings were: confirmation of the absence of accessory genital glands and, presence of an intromitent organ similar to the mammalian penis, with a free penis’s body, cylindrical and convex in shape, in whose dorsal surface has an ejaculatory groove made up of erectile tissue, able to become a similar conduit of the mammalian penile urethra. We suggest that this anatomical structure offers to this species some advantages in the physiology of the mating over other crocodilians of the Venezuelan plains.
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descripcion morfologica de las celulas sanguineas de la baba Caiman Crocodilus Crocodilus en vida silvestre
Revista de la Facultad de Ciencias Veterinarias UCV, 2010Co-Authors: Mario Rossini, Gisela Garcia C CAbstract:La “baba”, Caiman Crocodilus Crocodilus , es una especie que ha existido desde hace mas de 200 millones de anos y manteniendose sin variaciones durante el tiempo. El estudio de la morfologia y las dimensiones celulares es de gran utilidad al comparar e interpretar los hemogramas desde el punto de vista clinico patologico. Con el objetivo de estudiar las dimensiones y morfologia de las celulas sanguineas, se tomaron 100 animales del medio ambiente en la zona de Guaritico, estado Apure, con edades comprendidas entre 2 a 5 anos, de los cuales se obtuvieron muestras de sangre completa en tubos con EDTA, para ser procesadas en el laboratorio. Se realizaron frotis de las muestras que fueron tenidos con Giemsa, para analizar las caracteristicas morfologicas de cada grupo celular. Se utilizaron para la medicion, plantillas de acetato con agujeros al azar y se tomaron fotos de los campos para ser sometidas al programa morfometrico Sigma Scan Pro 5, el cual discrimina el tamano celular de la siguiente manera: eritrocitos: 12,5-19,5 µm; heterofilos: 11,3-18,5mm; eosinofilos: 11,5-14,9mm; basofilos: 12,7-16,0 mm; linfocitos: 6,5- 8,9mm; monocitos: 9,4-14,6 mm, respectivamente. En el caso de los trombocitos, el tamano fue 9,3-12,0 mm. La morfologia de las diferentes celulas coincide con la descrita para el Alligator mississippiensis , Caiman Crocodilus yacare , Caiman Crocodilus lacostris , la Agrionemys horsfieldi y en otros reptiles. ( Palabras clave : Caiman Crocodilus Crocodilus; Celulas sanguineas; Vida silvestre; Morfologia; Apure) Abstract The Caiman Crocodilus crocodiles is a species that has existed in nature for over 200 million years and has practically remained unchanged during this time. From the clinical pathological point of view, the morphological studies as well as the cellular dimensions are of great usefulness when describing and comparing hemograms. The aim of this investigation was to study the dimensions and morphology of blood cells. A sample of 100 animals from a wildlife reserve in Guaritico region, in the State of Apure, aged 2 to 5 years, was taken. Samples of whole blood using EDTA tubes were obtained and processed in the laboratory. Blood smears were stained with Giemsa and the morphological characteristics of each cellular group were analyzed. For measuring cell dimensions, randomly distributed holes were punched to acetate templates. Subsequently, photographs of the fields were taken and analysed using the Sigma Scan Pro 5 morphometric program. Results show the size of the different cells: erythrocytes: 12,5-19,5 µm; heterophils: 11,3-18,5 mm; eosinophils: 11,5-14,9mm; basophils: 12,7-16,0 mm; lymphocyte: 6,5- 8,9 mm; monocytes: 9,4-14,6 mm, respectively and thrombocytes 9,3-12,0 mm. The morphology of these different blood cells coincides with that described for the Alligator mississippiensis, Caiman Crocodilus yacare, Caiman Crocodilus lacostris , the Agrionemys horsfieldi and other reptile species. ( Key words : Caiman Crocodilus crocodiles; Blood cells; Wildlife; Morphology; Apure)
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caracteristicas histologicas del aparato genital masculino de la baba Caiman Crocodilus Crocodilus
Revista Científica de la Facultad de Ciencias Veterinarias de la Universidad del Zulia, 2007Co-Authors: Francisco Cabrera J A, Gisela Garcia C C, Maria A Gonzalezvera, Mario RossiniAbstract:Se realizo la descripcion histologica del aparato genital masculino de 9 babas adultas salvajes (Caiman Crocodilus Crocodilus), provenientes de los Llanos de Apure, Venezuela; las muestras obtenidas mediante necropsia, fijadas en formol al 10% amortiguado a pH 7,0 y procesadas mediante la tecnica de inclusion en parafina, fueron tenidas con la coloracion de rutina Hematoxilina-Eosina y con la coloracion Tricromica de Mallory. Los hallazgos mas importantes fueron: gran actividad espermatogenica; evidencia de granulos de secrecion acidofilos en algunos casos, y sin afinidad tintorial en otros, en diferentes segmentos del epididimo, presencia de glandulas de secrecion mucosa en el surco eyaculador y gran cantidad de tejido erectil a nivel de este surco y a lo largo del pene.
Zilca Campos - One of the best experts on this subject based on the ideXlab platform.
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RESEARCH ARTICLE Spatial and Temporal Variation in Reproduction of a Generalist Crocodilian, Caiman Crocodilus yacare, in a Seasonally Flooded Wetland
2016Co-Authors: Zilca Campos, William E Magnusson, Guilherme Mourao, Marcos Coutinho, M. A. SorianoAbstract:Wemonitored the number of Caiman (Caiman Crocodilus yacare) nests in two ranches in the Brazilian Pantanal that cover an area of about 50.000 ha for 28 years (1987–2014). The number of nests was related to combinations of rainfall, water level, and number of days with temperature below 20°C, depending on the area. Most of the variation in number of nests could not be predicted by the environmental variables, but could be represented mathematically by a sine wave. We were not able to identify any external driver and suspect that the regular fluctuations may have resulted from an intrinsic population process. Pres-ently, ranches are used as management units under the legislation for ranching Pantanal Caimans. However, although some breeding females were recaptured in the area after peri-ods of up to 21 years, most were not recaptured near nests or in general surveys of the area, suggesting that females are not strongly philopatric and that ranches do not represent isolated demographic units
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spatial and temporal variation in reproduction of a generalist crocodilian Caiman Crocodilus yacare in a seasonally flooded wetland
PLOS ONE, 2015Co-Authors: Zilca Campos, William E Magnusson, Guilherme Mourao, Marcos Coutinho, B M A SorianoAbstract:We monitored the number of Caiman (Caiman Crocodilus yacare) nests in two ranches in the Brazilian Pantanal that cover an area of about 50.000 ha for 28 years (1987–2014). The number of nests was related to combinations of rainfall, water level, and number of days with temperature below 20°C, depending on the area. Most of the variation in number of nests could not be predicted by the environmental variables, but could be represented mathematically by a sine wave. We were not able to identify any external driver and suspect that the regular fluctuations may have resulted from an intrinsic population process. Presently, ranches are used as management units under the legislation for ranching Pantanal Caimans. However, although some breeding females were recaptured in the area after periods of up to 21 years, most were not recaptured near nests or in general surveys of the area, suggesting that females are not strongly philopatric and that ranches do not represent isolated demographic units.
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camera traps capture images of predators of Caiman Crocodilus yacare eggs reptilia crocodylia in brazil s pantanal wetlands
Journal of Natural History, 2015Co-Authors: Zilca Campos, Guilherme MouraoAbstract:Camera traps were set up in forest nests in 2009, 2010 and 2012 to capture images of possible predators eating eggs of the Pantanal Caiman, Caiman Crocodilus yacare. We monitored 57 Caiman nests; 42 nests were opened and the eggs were counted (mean = 25 eggs/nest, SD = 4.3). Females were present and captured at 38 of those nests. The remaining 15 nests were used as controls, and we did not capture the females or open the egg cavities of these nests. Most of the nests had the eggs eaten by predators, in both the disturbed group (38 nests) and the control group (13 nests). The main predators were carnivorous mammals, such as crab-eating foxes (Cerdocyon thous), coatis (Nasua nasua) and tayras (Eira barbara), although feral pigs (Sus scrofa) and armadillos (Dasypus novemcinctus) were also photographed eating Caiman eggs. The lizard Salvator merianae was photographed eating eggs of two nests.
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growth of Caiman Crocodilus yacare in the brazilian pantanal
PLOS ONE, 2014Co-Authors: Zilca Campos, Guilherme Mourao, Marcos Coutinho, William E MagnussonAbstract:We studied growth of the Caiman, Caiman Crocodilus yacare, in the Brazilian Pantanal for 27 years between 1987 and 2013.We recaptured 647 of 7769 C. c. yacare initially marked in an area of 50 km2, in two ranches. We were able to determine size at age accurately for 24 male and17 female Caimans that had been marked at hatching or less than 1 year old, and recaptured over periods of 5 to 24 years. The other 606 Caimans were used to evaluate short-term growth rates. Age-size relationships were estimated using growth models from the Richards family of curves (full model, von Bertalanffy and monomolecular). The form of the relationships differed between analyses based on Caimans of known age and analyses based on integration of growth rate on size relationships for Caimans whose ages were not known. Individuals showed large variation in short-term growth rates, but data on known-age animals indicated little between-individual variability in long-term growth rates. There was evidence of a small effect of rainfall, but not temperature, on short-term growth of small Caimans, but most variation in growth rates was unexplained by variables other than age and sex. Data on known-age individuals indicated that female C. c. yacare generally reach sexual maturity between 10 and 15 years of age. Because of the asymptotic relationship between age and size, deviations of observations from the model for age are larger than for size, and estimates of age at a given size have greater errors than estimates of size at a given age. Integration of growth rate on size relationships may be adequate for estimating size from age in many cases, but accurate estimates of age from size require data on known-age individuals over the size range of the species.
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avaliacao do risco de extincao do jacare tinga Caiman Crocodilus linnaeus 1758 no brasil
Biodiversidade Brasileira - BioBrasil, 2013Co-Authors: Izeni Pires Farias, Boris Marioni, William E Magnusson, Marcos Coutinho, Luciano Martins Verdade, Luis Bassetti, Sonia H S T De Mendonca, Tiago Quaggio Vieira, Zilca CamposAbstract:O risco de extincao de Caiman Crocodilus foi avaliado de acordo com os criterios da Uniao Internacional para a Conservacao da Natureza (IUCN 2001, 2003), com base nos dados disponiveis ate 2011. A especie habita praticamente todos os tipos de ambientes de zonas umidas de baixa altitude na regiao Neotropical, sendo a especie dentre os crocodilianos mais abundantes e com maior distribuicao na America Latina. E encontrado naturalmente do Mexico ate a regiao amazonica. Sua extensao de ocorrencia (EOO) no territorio brasileiro e de 5.006.412,4 km2, podendo ser bem maior, caso as investigacoes sobre o status taxonomico da especie confirmarem a sua distribuicao nas bacias dos rios Madeira, Mamore e Guapore. Acredita-se que sua area de ocupacao (AOO) seja maior que 20.000 km2. E uma especie extremamente adaptavel, podendo ser encontrada em todos os habitats fluviais e lacustres presentes dentro de sua area de distribuicao geografica, e ocorre em grandes numeros ao longo da bacia amazonica e da bacia Tocantins-Araguaia, em especial em rios de agua branca. Portanto, C. Crocodilus foi categorizada como Menos Preocupante (LC). Ainda assim, a caca e uma forte ameaca para algumas subpopulacoes, sendo imprescindivel a implementacao de estudos de avaliacao da efetividade do manejo sustentavel como medida de conservacao das populacoes naturais e diminuicao do uso ilegal. Ha conectividade com populacoes dos paises vizinhos, porem nao se sabe se ha trocas significativas para justificar uma alteracao na categoria indicada na avaliacao brasileira.
González–desales G. A. - One of the best experts on this subject based on the ideXlab platform.
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Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México
Museu de Ciències Naturals de Barcelona, 2016Co-Authors: González–desales G. A., Monroy–vilchis O., Charruau P., Zarco–gonzález M. M.Abstract:Ecological aspects of nesting in Caiman Crocodilus chiapasius (Bocourt 1876) in La Encrucijada Biosphere Reserve, Mexico Studies on Caiman, Caiman Crocodilus chiapasius, in Mexico are scarce. The present study was conducted to evaluate the key characteristics regarding the reproductive ecology of Caiman in Mexico. We conducted nest searches from April to September 2014. We observed that nests were built in June and that hatching occurred in September and October. The phase of the moon had an effect on nesting events. The height of the nest, the distance to the nearest tree, and the distance from the top of the nest to the first egg were related to hatching success and incubation temperature
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Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México
'Consorci del Museu de Ciencies Naturals de Barcelona', 2016Co-Authors: González–desales G. A., Monroy–vilchis O., Charruau P., Zarco–gonzález M. M.Abstract:Existen pocos estudios sobre el caimán de anteojos, Caiman Crocodilus chiapasius, realizados en México. En el presente estudio evaluamos las características clave de la ecología reproductiva del caimán en México. Se realizó una búsqueda de nidos entre abril y septiembre de 2014, y se observó que la construcción de los mismos tiene lugar en junio y las eclosiones, en septiembre y octubre. La fase lunar influye en la anidación. Asimismo, la altura del nido, la distancia al árbol más cercano y la distancia desde el borde superior del nido al primer huevo están relacionadas con el éxito de eclosión y la temperatura de incubación.Ecological aspects of nesting in Caiman Crocodilus chiapasius (Bocourt 1876) in La Encrucijada Biosphere Reserve, Mexico Studies on Caiman, Caiman Crocodilus chiapasius, in Mexico are scarce. The present study was conducted to evaluate the key characteristics regarding the reproductive ecology of Caiman in Mexico. We conducted nest searches from April to September 2014. We observed that nests were built in June and that hatching occurred in September and October. The phase of the moon had an effect on nesting events. The height of the nest, the distance to the nearest tree, and the distance from the top of the nest to the first egg were related to hatching success and incubation temperature.Existen pocos estudios sobre el caimán de anteojos, Caiman Crocodilus chiapasius, realizados en México. En el presente estudio evaluamos las características clave de la ecología reproductiva del caimán en México. Se realizó una búsqueda de nidos entre abril y septiembre de 2014, y se observó que la construcción de los mismos tiene lugar en junio y las eclosiones, en septiembre y octubre. La fase lunar influye en la anidación. Asimismo, la altura del nido, la distancia al árbol más cercano y la distancia desde el borde superior del nido al primer huevo están relacionadas con el éxito de eclosión y la temperatura de incubación
Zarco-gonzález, Martha Mariela - One of the best experts on this subject based on the ideXlab platform.
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Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México
Animal Biodiversity and Conservation, 2016Co-Authors: González-desales, Giovany Arturo, Monroy-vilchis Octavio, Charruau Pierre, Zarco-gonzález, Martha MarielaAbstract:Aspectos ecológicos de la anidación de Caiman Crocodilus chiapasius (Bocourt, 1876) en la reserva de la biosfera La Encrucijada, México. — Existen pocos estudios sobre el caimán de anteojos, Caiman Crocodilus chiapasius, realizados en México. En el presente estudio evaluamos las características clave de la ecología reproductiva del caimán en México. Se realizó una búsqueda de nidos entre abril y septiembre de 2014, y se observó que la construcción de los mismos tiene lugar en junio y las eclosiones, en septiembre y octubre. La fase lunar influye en la anidación. Asimismo, la altura del nido, la distancia al árbol más cercano y la distancia desde el borde superior del nido al primer huevo están relacionadas con el éxito de eclosión y la temperatura de incubación
