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Search Results: 1 - 10 of 1998 matches for " Wood Turtle "
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Page 1 /1998
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Nesting ecology and hatching success of the Wood Turtle, Glyptemys insculpta in Quebec
Andrew D. Walde,J. Roger Bider,Denis Masse
Herpetological Conservation and Biology , 2007,
Abstract: The nesting ecology of Wood Turtles (Glyptemys insculpta) was studied in Québec, Canada during 1996 and 1997.Females made long-distance migrations to nesting grounds, where they staged for up to nine days before nesting. Fifty-fivepercent of the estimated female population was observed at this staging area. Wood Turtles exhibited strong nest sitefidelity, with 95% of females observed to nest in two consecutive years returning to the same nest site. Nesting occurred forapproximately two weeks during mid-June. Turtles were observed nesting during all daylight hours, with morning andevening peaks in activity. Clutch size was positively correlated to female size with larger females having larger clutches.Mean clutch sizes were significantly different between years. Nest success was 74% in 1996 and 65% in 1997. Nestsconstructed during the first half of the nesting season had significantly greater success, suggesting that northern WoodTurtle populations may be delimited by insufficient degree days for the completion of incubation. Staging, nest-site fidelity,and a short nesting season make them vulnerable to anthropogenic disturbances.
Green Turtle, Chelonia mydas, Nesting and Temperature Profile of the Nesting Beach at Huyong Island, the Similan Islands in Andaman Sea  [PDF]
Sarawoot Gomuttapong, Winai Klom-In, Jirarach Kitana, Putsatee Pariyanonth, Kumthorn Thirakhupt, Noppadon Kitana
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.44043
Abstract:

Global change in temperature is regarded as a serious natural disaster that may cause extinction of organisms. Green turtle, Chelonia mydas, is not only an endangered species but also a species with temperature dependent sex determination that could be affected by the global warming. In this study, nesting and temperature profile of C. mydas nesting beach at HuyongIsland, the most important nesting site of C. mydas in Andaman Sea of Thailand, were studied in order to monitor a potential effect of regional climate change on the green turtle nesting activity and habitat. Nesting activities were surveyed during May-August 2011 and temperature profiles of the nesting beach were monitored for 58 days during the normal incubation period of this species. The total of 25 nests with clutch size of 105 ± 25 eggs was found during this study period suggesting normal nesting activity of the green turtle. Temperature profile of the nesting beach showed similar trend among nests with no clear influence of the vegetation cover. Mean nest temperature at the middle-third period, corresponding to the temperature-sensitive period of C. mydas, ranged from 28.3°C to 28.9°C, suggesting a slightly male-biased sex ratio of the offspring. Overall, temperature profile of the nesting beach showed little or no indication of adverse effects of regional increase in temperature on nesting activity and egg incubation of the green turtle at this

Characterization of Blood Mononuclear Phagocytes in Phrynops hilarii (Chelonia Chelidae)
Pitol,Dimitrius Leonardo; Issa,Joáo Paulo Mardegan; Caetano,Flávio Henrique; Lunardi,Laurelúcia Orive;
International Journal of Morphology , 2007, DOI: 10.4067/S0717-95022007000200021
Abstract: the localization of peroxidase activity in different cell regions is used as a criterion for the classification of the stage of maturation of mammalian mononuclear phagocytes with a positive peroxidase reaction indicating the presence of monoblasts, promonocytes, monocytes and macrophages. in this study it was evaluated the peroxidase activity of blood mononuclear phagocytes of this turtle detected at different stages of differentiation. the present observations suggest that, in turtles, the differentiation of mononuclear phagocytes occur in the blood circulation, in contrast to animals, where only are monocytes in circulating blood and macrophage differentiation occurs in other body compartments
Morphological Characterization of the Leukocytes in Circulating Blood of the Turtle (Phrynops hilarii)
Pitol,Dimitrius Leonardo; Issa,Joao Paulo Mardegan; Caetano,Flávio Henrique; Lunardi,Laurelúcia Orive;
International Journal of Morphology , 2007, DOI: 10.4067/S0717-95022007000400002
Abstract: the phrynops hilarii specie of turtle has its characterization not well defined in the literature, it was proposed in this study the leukocyte characterization of the blood, stained by leishman and analyzed under light and transmission electron microscope. it was not observe any cellular type with similar characteristics to neutrophils in mammalian group. we believed, based on the data obtained in this study that the heterophils have a morphofuncional analogy with another neutrophils belonged to mammalian group. this conclusion is being supported in many recent studies found in the literature
Transferrin polymorphism in Amazon turtle (Podocnemis expansa) stocks
Teixeira, Aylton Saturnino;Jamieson, Alan;Raposo, José Carlos Paula;Vieira, Alvaro Alves;
Brazilian Journal of Genetics , 1996, DOI: 10.1590/S0100-84551996000400004
Abstract: the transferrin gene locus (tf) was investigated in five populations of the amazon turtle (podocnemis expansa) sampled from five geographical areas in the amazon region. this locus was polymorphic, showing three genotypes (tfa tfa, tfa tfb and tfb tfb), presumably encoded by two co-dominant alleles, tfa and tfb. all populations showed good genetic balance according to hardy-weinberg expectations, and may sustain the hypothesis of a single stock in the area investigated. the data are consistent with free flow of genes among the population samples examined.
Temnocefalídeo em tartaruga de água doce, Hydromedusa tectifera, da regi?o central do Rio Grande do Sul
Soares, Jo?o Fábio;Oliveira, Camila Belmonte;Silva, Aleksandro Schafer da;Souza, Carini Pascoal;Monteiro, Silvia Gonzalez;
Ciência Rural , 2007, DOI: 10.1590/S0103-84782007000300050
Abstract: this study was aimed at reporting the presence of temnocephala sp. in fresh water turtle (hydromedusa tectifera) central area of rio grande do sul, brazil. the platyhelminths have been found fastened in body, members, and shell of the host being collected through cutaneous scratching. in the laboratory they were assembled between glass sheets and identified as being belonging to the temnocephala genus.
Observa??es sobre o comportamento de nidifica??o de três espécies de Podocnemis Wagler (Testudinata, Pelomedusidae) no Baixo Rio Branco, Roraima, Brasil
Nascimento, Sebasti?o Pereira do;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000100018
Abstract: some aspects on nidification behavior of three species of turtles [podocnemis unifdis (troschel, 1848), podocnemis sextuberculata (cornália, 1849) and podocnemis expansa (schweigger, 1812)] in the northern brazilian amaz?nia are reported. the three species showed similar nidification activities.
Notes on the hematology of free-living Phrynops geoffroanus (Testudines: Chelidae) in polluted rivers of Southeastern Brazil
Ferronato, Bruno O.;Genoy-Puerto, Alexander;Pi?a, Carlos I.;Souza, Franco L.;Verdade, Luciano M.;Matushima, Eliana R.;
Zoologia (Curitiba) , 2009, DOI: 10.1590/S1984-46702009000400027
Abstract: phrynops geoffroanus (schweigger, 1812) is the freshwater turtle with the widest geographical distribution in south america. during 2006, physical examination and hematological evaluation were performed on free-ranging turtles from two polluted rivers, the piracicaba river (n = 51) and its tributary piracicamirim (n = 42), in southeastern brazil. red blood cell and thrombocyte counts, mean corpuscular volume and mean corpuscular hemoglobin levels differed in turtles from the two water courses. although free-ranging turtles showed ectoparasites and boat propeler lesions, animals apparently had no signs of clinical disease. in spite of our results, further monitoring of the demography and health status of phrynops geoffroanus in anthropogenically altered environments is recommended.
The Direct Use of Post-Processing Wood Dust in Gas Turbines  [PDF]
Al?ne Doherty, Eilín Walsh, Kevin P. McDonnell
Journal of Sustainable Bioenergy Systems (JSBS) , 2012, DOI: 10.4236/jsbs.2012.23009
Abstract: Woody biomass is a widely-used and favourable material for energy production due to its carbon neutral status. Energy is generally derived either through direct combustion or gasification. The Irish forestry sector is forecasted to expand significantly in coming years, and so the opportunity exists for the bioenergy sector to take advantage of the material for which there will be no demand from current markets. A by-product of wood processing, wood dust is the cheapest form of wood material available to the bioenergy sector. Currently wood dust is primarily processed into wood pellets for energy generation. Research was conducted on post-processing birch wood dust; the calorific value and the Wobbe Index were determined for a number of wood particle sizes and wood dust concentrations. The Wobbe Index determined for the upper explosive concentration (4000 g/m3) falls within range of that of hydrogen gas, and wood dust-air mixtures of this concentration could therefore behave in a similar manner in a gas turbine. Due to its slightly lower HHV and higher particle density, however, alterations to the gas turbine would be necessary to accommodate wood dust to prevent abrasive damage to the turbine. As an unwanted by-product of wood processing the direct use of wood dust in a gas turbine for energy generation could therefore have economic and environmental benefits.
Effect of localized oil spills on Atlantic loggerhead population dynamics  [PDF]
Margaret-Rose Leung, Melissa Marchand, Samantha Stykel, My Huynh, José D. Flores
Open Journal of Ecology (OJE) , 2012, DOI: 10.4236/oje.2012.23013
Abstract: The purpose of this study is to analyze the population dynamics of loggerhead sea turtles (Caretta caretta) affected by localized oil spills. Methods include development of a spatial, stage-classified matrix model parameterized for the following primary loggerhead populations: Gulf of Mexico, western North Atlantic Ocean, and Florida peninsula. Oil spills are simulated deterministically in each population's nesting region, with 1) oil-induced mortality ranging from 25% to 100% and 2) stage classes affected either proportionally or equally. A transient sensitivity analysis was performed to determine the parameters most influential to the population growth rate. Results suggest that increased protection and understanding of young sea turtles found in the Sargasso Sea is essential to the survival of the species. In addition, findings provide insights into the population dynamics of the At- lantic loggerhead turtles and identify conservation measures appropriate in each oil spill case.
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