Base de dados : MEDLINE
Pesquisa : B01.050.150.900.833.848 [Categoria DeCS]
Referências encontradas : 7730 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 773 ir para página                         

  1 / 7730 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
[PMID]:29210232
[Au] Autor:Tantipisanuh N; Gale GA; Pollino C
[Ti] Título:Bayesian networks for habitat suitability modeling: a potential tool for conservation planning with scarce resources.
[So] Source:Ecol Appl;24(7):1705-18, 2014.
[Is] ISSN:1051-0761
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Bayesian networks (BN) have been increasingly used for habitat suitability modeling of threatened species due to their potential to construct robust models with limited survey data. However, previous applications of this approach have only occurred in countries where human and budget resources are highly available, but the highest concentrations of threatened vertebrates globally are located in the tropics where resources are much more limited. We assessed the effectiveness of Bayesian networks in generating habitat suitability models in Thailand, a biodiversity-rich country where the knowledge base is typically sparse for a wide range of threatened species. The Bayesian network approach was used to generate habitat suitability maps for 52 threatened vertebrate species in Thailand, using a range of evidence types, from relatively well-documented species with good local knowledge to poorly documented species, with few local experts. Published information and expert knowledge were used to define habitat requirements. Focal species were categorized into 22 groups based on known habitat preferences, and then habitat suitability models were constructed with outcomes represented spatially. Models had a consistent structure with three major components: potential habitat, known range, and threat level. Model classification sensitivity was tested using presence-only field data for 21 species. Habitat models for 12 species were relatively sensitive (>70% congruency between observed and predicted locations), three were moderately congruent, and six were poor. Classification sensitivity tended to be high for bird models and moderate for mammals, whereas sensitivity for reptiles was low, presumably reflecting the relatively poor knowledge base for reptiles in the region. Bayesian network models show significant potential for biodiversity-rich regions with scarce resources, although they require further refinement and testing. It is possible that one detailed ecological study is sufficient to develop a model with reasonable sensitivity, but BN models for species groups with no quantitative data continue to be problematic.
[Mh] Termos MeSH primário: Conservação dos Recursos Naturais/métodos
Ecossistema
Modelos Biológicos
[Mh] Termos MeSH secundário: Anfíbios/fisiologia
Animais
Teorema de Bayes
Aves/fisiologia
Lontras/fisiologia
Especificidade da Espécie
Tailândia
Tartarugas/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171207
[St] Status:MEDLINE


  2 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28458430
[Au] Autor:Adel M; Sadegh AB; Arizza V; Abbasi H; Inguglia L; Saravi HN
[Ad] Endereço:Department of Aquatic Animal Health and Diseases, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Tehran, Iran.
[Ti] Título:Anesthetic efficacy of ketamine-diazepam, ketamine-xylazine, and ketamine-acepromazine in Caspian Pond turtles ( ).
[So] Source:Indian J Pharmacol;49(1):93-97, 2017 Jan-Feb.
[Is] ISSN:1998-3751
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:OBJECTIVES: The objective of this study was to assess the efficacy of different anesthetic drug combinations on the Caspian Pond turtles ( ). SUBJECTS AND METHODS: Three groups of the Caspian Pond turtles ( = 6) were anesthetized with three different drug combinations. Initially, a pilot study was conducted to determine the best drug doses for the anesthetization of the turtles, and according to these results, ketamine-diazepam (120 mg/kg ketamine hydrochloride [5%] and 2 mg/kg diazepam [5%]), ketamine-acepromazine (120 mg/kg ketamine hydrochloride [5%] and 1 mg/kg acepromazine [1%]), and ketamine-xylazine (120 mg/kg ketamine hydrochloride [5%] and 1 mg/kg xylazine [2%]) were injected intramuscularly. The onset times of anesthetization and the recovery time were measured. Statistical analysis of the data was performed using one-way analysis of variance followed by -tests, and < 0.05 was considered statistically significant. RESULTS: There were statistically significant differences in the mean of the onset times of anesthesia and recovery time among the three drug combinations depending on the treatment used. The onset of anesthesia of the animals treated with the ketamine-diazepam combination was 60% and 42% shorter, for male and female turtles, respectively, compared to that obtained with the ketamine-acepromazine combination and 64% (male turtles) and 50% (female turtles) shorter than that obtained with the ketamine-xylazine combination. Further, the recovery time, in male turtles, was 17% shorter in animals treated with the first drug combination than those treated with the ketamine-acepromazine combination and 37% shorter than those treated with the ketamine-xylazine combination. The recovery time, in female turtles, did not seem to be significantly different among treatments. CONCLUSIONS: The study showed that the ketamine-diazepam drug combination is the anesthetic combination with the fastest onset time and shortest recovery time.
[Mh] Termos MeSH primário: Acepromazina/administração & dosagem
Diazepam/administração & dosagem
Ketamina/administração & dosagem
Xilazina/administração & dosagem
[Mh] Termos MeSH secundário: Acepromazina/farmacologia
Período de Recuperação da Anestesia
Anestésicos/administração & dosagem
Anestésicos/farmacologia
Animais
Diazepam/farmacologia
Relação Dose-Resposta a Droga
Feminino
Injeções Intramusculares
Ketamina/farmacologia
Masculino
Projetos Piloto
Fatores Sexuais
Fatores de Tempo
Tartarugas
Xilazina/farmacologia
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anesthetics); 2KFG9TP5V8 (Xylazine); 54EJ303F0R (Acepromazine); 690G0D6V8H (Ketamine); Q3JTX2Q7TU (Diazepam)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171229
[Lr] Data última revisão:
171229
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170502
[St] Status:MEDLINE
[do] DOI:10.4103/0253-7613.201023


  3 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29116881
[Au] Autor:Li T; Cao P; Bei YJ; Du WG
[Ti] Título:Latitudinal and Temperature-Dependent Variation in Embryonic Development Rate and Offspring Performance in a Freshwater Turtle.
[So] Source:Physiol Biochem Zool;91(1):673-681, 2018 Jan/Feb.
[Is] ISSN:1537-5293
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The thermal environment of embryos differs significantly along a latitudinal cline, and the mechanism by which embryos respond to this geographic temperature variation has attracted increasing attention recently. Here, we carried out a common-garden experiment of egg incubation at two fluctuating temperature regimes to elucidate the latitudinal pattern and thermal dependence of the embryonic development rate and offspring performance in the Chinese soft-shelled turtle (Pelodiscus sinensis). Our results demonstrated significant temperature-by-population interactions on variations in the incubation period and hatchling righting response. The incubation period was shorter and the daily number of heart beats was higher in the medium- and high-latitude populations than in the low-latitude population at low incubation temperatures but not at high temperatures. Offspring from the medium- and high-latitude populations showed a faster righting response than those from the low-latitude population when incubated at low temperatures, whereas offspring from the high-latitude population showed a faster righting response than those from the medium-latitude population when incubated at high temperatures. This indicates that turtle embryos from different latitudinal locations may have evolved divergent thermal sensitivities of embryonic development in response to their respective nest environments.
[Mh] Termos MeSH primário: Distribuição Animal
Embrião não Mamífero/fisiologia
Desenvolvimento Embrionário/fisiologia
Temperatura Ambiente
Tartarugas/embriologia
Tartarugas/fisiologia
[Mh] Termos MeSH secundário: Animais
China
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171109
[St] Status:MEDLINE
[do] DOI:10.1086/694856


  4 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28950002
[Au] Autor:Mitura A; Niemczuk K; Zareba K; Zajac M; Laroucau K; Szymanska-Czerwinska M
[Ad] Endereço:Department of Cattle and Sheep Diseases, National Veterinary Research Institute, Pulawy, Poland.
[Ti] Título:Free-living and captive turtles and tortoises as carriers of new Chlamydia spp.
[So] Source:PLoS One;12(9):e0185407, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A variety of Chlamydia species belonging to the Chlamydiaceae family have been reported in reptilian hosts but scarce data about their occurrence in turtles and tortoises are available. In this study, research was conducted to acquire information on invasive alien species (IAS) of turtles and indigenous turtles and tortoises, living both free and in captivity, as possible reservoirs of Chlamydiaceae. Analysis of specimens (pharyngeal and cloacal swabs and tissues) from 204 turtles and tortoises revealed an overall Chlamydiaceae prevalence of 18.3% and 28.6% among free-living and captive animals respectively, with variable levels of shedding. Further testing conducted with a species-specific real-time PCR and microarray test was unsuccessful. Subsequently sequencing was applied to genotype the Chlamydiaceae-positive samples. Almost the full lengths of the 16S rRNA and ompA genes as well as the 16S-23S intergenic spacer (IGS) and 23S rRNA domain I were obtained for 14, 20 and 8 specimens respectively. Phylogenetic analysis of 16S rRNA amplicons revealed two distinct branches. Group 1 (10 specimens), specific to freshwater turtles and reported here for the first time, was most closely related to Chlamydia (C.) pneumoniae strains and the newly described Candidatus C. sanzinia. Group 2 (four specimens), detected in Testudo spp. samples, showed highest homology to C. pecorum strains but formed a separate sub-branch. Finally, molecular analysis conducted on positive samples together with their geographical distribution in places distant from each other strongly suggest that Group 1 specimens correspond to a new species in the Chlamydiaceae family. In-depth studies of Chlamydia spp. from turtles and tortoises are needed to further characterise these atypical strains and address arising questions about their pathogenicity and zoonotic potential.
[Mh] Termos MeSH primário: Chlamydia/isolamento & purificação
Tartarugas/microbiologia
[Mh] Termos MeSH secundário: Animais
Chlamydia/classificação
Chlamydia/genética
Genótipo
Filogenia
RNA Ribossômico 16S/genética
RNA Ribossômico 23S/genética
Reação em Cadeia da Polimerase em Tempo Real
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S); 0 (RNA, Ribosomal, 23S)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170927
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0185407


  5 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28893547
[Au] Autor:Díaz-Hernández V; Vázquez-Gómez A; Marmolejo-Valencia A; Montaño LM; Merchant-Larios H
[Ad] Endereço:Departamento de Embriología, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico. Electronic address: roveazdih@yahoo.com.mx.
[Ti] Título:17ß-Estradiol modulates cell proliferation of medullary cords during ovarian differentiation of the Lepidochelys olivacea sea turtle.
[So] Source:Dev Biol;431(2):263-271, 2017 11 15.
[Is] ISSN:1095-564X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In turtles undergoing temperature sex determination (TSD), bipotential gonads express Sox9 in medullary cords at both female- (FPT) and male-producing temperatures (MPT). Subsequently, when the sex fate of medullary cords becomes dimorphic, at FPT, Sox9 is downregulated, whereas at MPT, its expression is maintained. Medullary cords in the ovary turn into ovarian lacuna, whereas in the testis they differentiate as seminiferous cords. When embryos of Lepidochelys olivacea sea turtle are incubated at MPT and treated with estradiol, Sox9 expression persists in the medullary cords in the form of tiny ovotestis-like formations. The perturbed development of the treated gonads is due to a significant decrease in the number of proliferating cells. This suggests that the disturbed effect caused by exogenous estradiol may be due to a conflict between the gene networks regulated by temperature and the increased level of endogenous estrogens, induced by the treatment. Here, we decided to use fadrozole and fulvestrant, an aromatase inhibitor and an estrogen-receptor antagonist, respectively, to provide insights into the role played by endogenous estrogens in regulating the cell proliferation of the two main gonadal compartments: the medullary cords and the cortex. Comparing cell proliferation patterns, our current results suggest that the endogenous estrogens are involved in determining the sex fate of medullary cords, by repressing proliferation. Interestingly, our results showed that endogenous estradiol levels are unnecessary for the thickening of the ovarian cortex.
[Mh] Termos MeSH primário: Estradiol/farmacologia
Ovário/citologia
Diferenciação Sexual/efeitos dos fármacos
Tartarugas/fisiologia
[Mh] Termos MeSH secundário: Animais
Proliferação Celular/efeitos dos fármacos
Embrião não Mamífero/efeitos dos fármacos
Embrião não Mamífero/metabolismo
Estradiol/análogos & derivados
Fadrozol/farmacologia
Feminino
Imunofluorescência
Queratinas/metabolismo
Masculino
Ovário/embriologia
Ovário/ultraestrutura
Fatores de Transcrição SOX9/metabolismo
Temperatura Ambiente
Testículo/efeitos dos fármacos
Tartarugas/embriologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (SOX9 Transcription Factor); 22X328QOC4 (fulvestrant); 4TI98Z838E (Estradiol); 68238-35-7 (Keratins); H3988M64PU (Fadrozole)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171111
[Lr] Data última revisão:
171111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170913
[St] Status:MEDLINE


  6 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28873453
[Au] Autor:Robinson DP; Jabado RW; Rohner CA; Pierce SJ; Hyland KP; Baverstock WR
[Ad] Endereço:Jumeirah Group, Dubai, United Arab Emirates.
[Ti] Título:Satellite tagging of rehabilitated green sea turtles Chelonia mydas from the United Arab Emirates, including the longest tracked journey for the species.
[So] Source:PLoS One;12(9):e0184286, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We collected movement data for eight rehabilitated and satellite-tagged green sea turtles Chelonia mydas released off the United Arab Emirates between 2005 and 2013. Rehabilitation periods ranged from 96 to 1353 days (mean = 437 ± 399 days). Seven of the eight tagged turtles survived after release; one turtle was killed by what is thought to be a post-release spear gun wound. The majority of turtles (63%) used shallow-water core habitats and established home ranges between Dubai and Abu Dhabi, the same area in which they had originally washed ashore prior to rescue. Four turtles made movements across international boundaries, highlighting that regional cooperation is necessary for the management of the species. One turtle swam from Fujairah to the Andaman Sea, a total distance of 8283 km, which is the longest published track of a green turtle. This study demonstrates that sea turtles can be successfully reintroduced into the wild after sustaining serious injury and undergoing prolonged periods of intense rehabilitation.
[Mh] Termos MeSH primário: Migração Animal/fisiologia
Comunicações Via Satélite
Tartarugas/fisiologia
[Mh] Termos MeSH secundário: Animais
Ecossistema
Comportamento de Retorno ao Território Vital
Estações do Ano
Especificidade da Espécie
Temperatura Ambiente
Fatores de Tempo
Emirados Árabes Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170906
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184286


  7 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28842417
[Au] Autor:Guzulaitis R; Hounsgaard J
[Ad] Endereço:Department of Neuroscience, University of Copenhagen, Panum Institute, Copenhagen, DK 2200, Denmark r.guzulaitis@gmail.com.
[Ti] Título:Synaptic Excitation in Spinal Motoneurons Alternates with Synaptic Inhibition and Is Balanced by Outward Rectification during Rhythmic Motor Network Activity.
[So] Source:J Neurosci;37(38):9239-9248, 2017 Sep 20.
[Is] ISSN:1529-2401
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Regular firing in spinal motoneurons of red-eared turtles ( , either sex) evoked by steady depolarization at rest is replaced by irregular firing during functional network activity. The transition caused by increased input conductance and synaptic fluctuations in membrane potential was suggested to originate from intense concurrent inhibition and excitation. We show that the conductance increase in motoneurons during functional network activity is mainly caused by intrinsic outward rectification near threshold for action potentials by activation of voltage and Ca gated K channels. Intrinsic outward rectification facilitates spiking by focusing synaptic depolarization near threshold for action potentials. By direct recording of synaptic currents, we also show that motoneurons are activated by out-of-phase peaks in excitation and inhibition during network activity, whereas continuous low-level concurrent inhibition and excitation may contribute to irregular firing. Neurons embedded in active neural networks can enter a high-conductance state. High-conductance states were observed in spinal motoneurons during rhythmic motor behavior. Assuming no change in intrinsic conductance, it was suggested that the high-conductance state in motoneurons originated from balanced inhibition and excitation. In this study, we demonstrate that intrinsic outward rectification significantly contributes to the high-conductance state. Outward rectification balances synaptic excitation and maintains membrane potential near spike threshold. In addition, direct synaptic current recordings show out-of-phase excitation and inhibition in motoneurons during rhythmic network activity.
[Mh] Termos MeSH primário: Potenciais de Ação/fisiologia
Geradores de Padrão Central/fisiologia
Neurônios Motores/fisiologia
Inibição Neural/fisiologia
Periodicidade
Medula Espinal/fisiologia
Transmissão Sináptica/fisiologia
[Mh] Termos MeSH secundário: Animais
Potenciais Pós-Sinápticos Excitadores/fisiologia
Potenciais da Membrana/fisiologia
Neurônios Motores/citologia
Rede Nervosa/fisiologia
Medula Espinal/citologia
Tartarugas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170827
[St] Status:MEDLINE
[do] DOI:10.1523/JNEUROSCI.0800-17.2017


  8 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28841368
[Au] Autor:Rousselet E; Levin M; Gebhard E; Higgins BM; DeGuise S; Godard-Codding CAJ
[Ad] Endereço:a Department of Environmental Toxicology , The Institute of Environmental and Human Health, Texas Tech University , Lubbock , TX , USA.
[Ti] Título:Polychlorinated biphenyls (PCBs) modulate both phagocytosis and NK cell activity in vitro in juvenile loggerhead sea turtles (Caretta caretta).
[So] Source:J Toxicol Environ Health A;80(10-12):556-561, 2017.
[Is] ISSN:1528-7394
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Threatened loggerhead sea turtles (Caretta caretta) face numerous environmental challenges, including exposure to anthropogenic chemicals such as polychlorinated biphenyls (PCBs). Despite being banned by the USA in the 1970s, PCBs persist in the environment and produce immunotoxic effects in a wide range of marine vertebrate species. This is of particular concern, as the modulation of the immune system may enhance the susceptibility to a variety of pathogens. Blood samples were collected from 19 immature, captive-reared loggerhead sea turtles. Functional immune assays phagocytosis and natural killer (NK) cell activity were used to quantify the direct effects of PCB congeners 105, 138, and 169 on innate immune functions upon in vitro exposure of sea turtle cells to increasing concentrations (control (0), 0.5, 1, 2.5, 5, 10, 15, or 20 ppm) of each PCB. PCB 105 significantly elevated eosinophil phagocytosis at 10 and 15 ppm and PCB 138 at 15 ppm compared to unexposed (0 ppm). The effects of PCB 169 on phagocytosis were not evaluated. PCB 138 and 105 significantly decreased NK cell activity at 15 and 20 ppm, compared to unexposed (0 ppm) controls. PCB 169 did not markedly modulate NK activity. This constitutes the first study to investigate the in vitro effects of these three PCBs on sea turtle innate immune functions. These results add to our understanding of PCB-induced immunotoxicity in sea turtles and may provide a framework for establishing the relationships between chemical levels and turtle immunity.
[Mh] Termos MeSH primário: Exposição Ambiental
Células Matadoras Naturais/efeitos dos fármacos
Fagocitose/efeitos dos fármacos
Bifenilos Policlorados/toxicidade
Tartarugas/fisiologia
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Animais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); DFC2HB4I0K (Polychlorinated Biphenyls)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171006
[Lr] Data última revisão:
171006
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170826
[St] Status:MEDLINE
[do] DOI:10.1080/15287394.2017.1363102


  9 / 7730 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28829820
[Au] Autor:Acuña-Marrero D; Smith ANH; Hammerschlag N; Hearn A; Anderson MJ; Calich H; Pawley MDM; Fischer C; Salinas-de-León P
[Ad] Endereço:Charles Darwin Research Station, Puerto Ayora, Islas Galápagos, Ecuador.
[Ti] Título:Residency and movement patterns of an apex predatory shark (Galeocerdo cuvier) at the Galapagos Marine Reserve.
[So] Source:PLoS One;12(8):e0183669, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The potential effectiveness of marine protected areas (MPAs) as a conservation tool for large sharks has been questioned due to the limited spatial extent of most MPAs in contrast to the complex life history and high mobility of many sharks. Here we evaluated the movement dynamics of a highly migratory apex predatory shark (tiger shark Galeocerdo cuvier) at the Galapagos Marine Reserve (GMR). Using data from satellite tracking passive acoustic telemetry, and stereo baited remote underwater video, we estimated residency, activity spaces, site fidelity, distributional abundances and migration patterns from the GMR and in relation to nesting beaches of green sea turtles (Chelonia mydas), a seasonally abundant and predictable prey source for large tiger sharks. Tiger sharks exhibited a high degree of philopatry, with 93% of the total satellite-tracked time across all individuals occurring within the GMR. Large sharks (> 200 cm TL) concentrated their movements in front of the two most important green sea turtle-nesting beaches in the GMR, visiting them on a daily basis during nocturnal hours. In contrast, small sharks (< 200 cm TL) rarely visited turtle-nesting areas and displayed diurnal presence at a third location where only immature sharks were found. Small and some large individuals remained in the three study areas even outside of the turtle-nesting season. Only two sharks were satellite-tracked outside of the GMR, and following long-distance migrations, both individuals returned to turtle-nesting beaches at the subsequent turtle-nesting season. The spatial patterns of residency and site fidelity of tiger sharks suggest that the presence of a predictable source of prey and suitable habitats might reduce the spatial extent of this large shark that is highly migratory in other parts of its range. This highly philopatric behaviour enhances the potential effectiveness of the GMR for their protection.
[Mh] Termos MeSH primário: Ecossistema
Comportamento Predatório
Tubarões/fisiologia
[Mh] Termos MeSH secundário: Migração Animal
Animais
Oceano Atlântico
Feminino
Masculino
Densidade Demográfica
Tartarugas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170823
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183669


  10 / 7730 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28813439
[Au] Autor:Currylow AFT; Mandimbihasina A; Gibbons P; Bekarany E; Stanford CB; Louis EE; Crocker DE
[Ad] Endereço:Integrative and Evolutionary Biology, University of Southern California, Los Angeles, California, United States of America.
[Ti] Título:Comparative ecophysiology of a critically endangered (CR) ectotherm: Implications for conservation management.
[So] Source:PLoS One;12(8):e0182004, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Captive breeding is a vital conservation tool for many endangered species programs. It is often a last resort when wild animal population numbers drop to below critical minimums for natural reproduction. However, critical ecophysiological information of wild counterparts may not be well documented or understood, leading to years of minimal breeding successes. We collected endocrine and associated ecological data on a critically endangered ectotherm concurrently in the wild and in captivity over several years. We tracked plasma concentrations of steroid stress and reproductive hormones, body condition, activity, and environmental parameters in three populations (one wild and two geographically distinct captive) of ploughshare tortoise (Astrochelys yniphora). Hormone profiles along with environmental and behavioral data are presented and compared. We show that animals have particular seasonal environmental requirements that can affect annual reproduction, captivity affects reproductive state, and sociality may be required at certain times of the year for breeding to be successful. Our data suggest that changes in climatic conditions experienced by individuals, either due to decades-long shifts or hemispheric differences when translocated from their native range, can stifle breeding success for several years while the animals physiologically acclimatize. We also found that captivity affects stress (plasma corticosterone) and body condition of adults and juveniles differently and seasonally. Our results indicate that phenotypic plasticity in reproduction and behavior is related to environmental cues in long-lived ectotherms, and detailed ecophysiological data should be used when establishing and improving captive husbandry conditions for conservation breeding programs. Further, considering the recent revelation of this tortoises' possible extirpation from the wild, these data are critically opportune and may be key to the survival of this species.
[Mh] Termos MeSH primário: Conservação dos Recursos Naturais
Espécies em Perigo de Extinção
Tartarugas
[Mh] Termos MeSH secundário: Animais
Animais Selvagens
Comportamento Animal
Ecossistema
Meio Ambiente
Feminino
Hormônios/sangue
Madagáscar
Masculino
Estresse Fisiológico
Estados Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hormones)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171018
[Lr] Data última revisão:
171018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170817
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182004



página 1 de 773 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde