Base de dados : MEDLINE
Pesquisa : B01.050.150.900.649.313.875.267.150 [Categoria DeCS]
Referências encontradas : 63 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 7 ir para página                  

  1 / 63 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28192446
[Au] Autor:Farías-Curtidor N; Barragán-Barrera DC; Chávez-Carreño PA; Jiménez-Pinedo C; Palacios DM; Caicedo D; Trujillo F; Caballero S
[Ad] Endereço:Conjunto Caeli Reservado, Cajicá, Colombia.
[Ti] Título:Range extension for the common dolphin (Delphinus sp.) to the Colombian Caribbean, with taxonomic implications from genetic barcoding and phylogenetic analyses.
[So] Source:PLoS One;12(2):e0171000, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The nearest known population of common dolphins (Delphinus sp.) to the Colombian Caribbean occurs in a fairly restricted range in eastern Venezuela. These dolphins have not been previously reported in the Colombian Caribbean, likely because of a lack of study of the local cetacean fauna. We collected cetacean observations in waters of the Guajira Department, northern Colombia (~11°N, 73°W) during two separate efforts: (a) a seismic vessel survey (December 2009-March 2010), and (b) three coastal surveys from small boats (May-July 2012, May 2013, and May 2014). Here we document ten sightings of common dolphins collected during these surveys, which extend the known range of the species by ~1000 km into the southwestern Caribbean. We also collected nine skin biopsies in 2013 and 2014. In order to determine the taxonomic identity of the specimens, we conducted genetic barcoding and phylogenetic analyses using two mitochondrial markers, the Control Region (mtDNA) and Cytochrome b (Cytb). Results indicate that these specimens are genetically closer to the short-beaked common dolphin (Delphinus delphis) even though morphologically they resemble a long-beaked form (Delphinus sp.). However, the specific taxonomic status of common dolphins in the Caribbean and in the Western Atlantic remains unresolved. It is also unclear whether the distribution of the species between northern Colombia and eastern Venezuela is continuous or disjoined, or whether they can be considered part of the same stock.
[Mh] Termos MeSH primário: Golfinhos Comuns/genética
Citocromos b/genética
Código de Barras de DNA Taxonômico/métodos
DNA Mitocondrial/genética
Filogenia
[Mh] Termos MeSH secundário: Animais
Região do Caribe
Cetáceos/classificação
Cetáceos/genética
Colômbia
Golfinhos Comuns/classificação
Golfinhos Comuns/fisiologia
DNA Mitocondrial/química
Geografia
Reação em Cadeia da Polimerase
Dinâmica Populacional
Análise de Sequência de DNA/métodos
Especificidade da Espécie
Venezuela
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Mitochondrial); 9035-37-4 (Cytochromes b)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170824
[Lr] Data última revisão:
170824
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170214
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0171000


  2 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27995620
[Au] Autor:Thean T; Kardjilov N; Asher RJ
[Ad] Endereço:Department of Zoology, University of Cambridge, Cambridge, UK.
[Ti] Título:Inner ear development in cetaceans.
[So] Source:J Anat;230(2):249-261, 2017 Feb.
[Is] ISSN:1469-7580
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Cetaceans face the challenge of maintaining equilibrium underwater and obtaining sensory input within a dense, low-visibility medium. The cetacean ear represents a key innovation that marked their evolution from terrestrial artiodactyls to among the most fully aquatic mammals in existence. Using micro-CT and histological data, we document shape and size changes in the cetacean inner ear during ontogeny, and demonstrate that, as a proportion of gestation time, the cetacean inner ear is precocial in its growth compared with that of suid artiodactyls. Cetacean inner ears begin ossifying and reach near-adult shape as early as at 32% of the gestation period, and near-adult dimensions as early as at 27% newborn total length. Our earliest embryos with measurable inner ears (13% newborn length) exhibit a flattened cochlea (i.e. smaller distance from cochlear apex to round window) compared with later and adult stages. Inner ears of Sus scrofa have neither begun ossifying nor reached near-adult dimensions at 55% of the gestation period, but have an adult-like ratio of cochlear diameters to each other, suggesting an adult-like shape. The precocial development of the cetacean inner ear complements previous work demonstrating precocial development of other cetacean anatomical features such as the locomotor muscles to facilitate swimming at the moment of birth.
[Mh] Termos MeSH primário: Balaenoptera/crescimento & desenvolvimento
Golfinhos Comuns/crescimento & desenvolvimento
Orelha Interna/crescimento & desenvolvimento
Jubarte/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Animais
Balaenoptera/anatomia & histologia
Cetáceos/anatomia & histologia
Cetáceos/crescimento & desenvolvimento
Cóclea/anatomia & histologia
Cóclea/crescimento & desenvolvimento
Golfinhos Comuns/anatomia & histologia
Orelha Interna/anatomia & histologia
Jubarte/anatomia & histologia
Canais Semicirculares/anatomia & histologia
Canais Semicirculares/crescimento & desenvolvimento
Especificidade da Espécie
Sus scrofa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170904
[Lr] Data última revisão:
170904
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161221
[St] Status:MEDLINE
[do] DOI:10.1111/joa.12548


  3 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27990670
[Au] Autor:Arribart M; Ognard J; Guintard C; Domergue F; Hassani S; Ben Salem D; Jung JL
[Ad] Endereço:Service d'anatomie comparée, Ecole Nationale Vétérinaire ONIRIS, 102 Route de Gachet, 44300, Nantes, France.
[Ti] Título:Magnetic Resonance Imaging Study of Adipose Tissues in the Head of a Common Dolphin (Delphinus delphis): Structure Identification and Influence of a Freezing-Thawing Cycle.
[So] Source:Anat Histol Embryol;46(2):204-212, 2017 Apr.
[Is] ISSN:1439-0264
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Magnetic resonance imaging (MRI) was used to scan the head of a common dolphin (Delphinus delphis) in order to visualize the different adipose tissues involved in echolocation functioning and to precisely delineate their anatomical topology. MRI scans were performed on the head taken from a freshly stranded carcass and repeated after a 2-week freezing time followed by thawing. The main fatty organs of the head, that is the melon, the mandibula bulba, the bursae cantantes, and their different connections with surrounding tissues were identified and labelled. The nasal sacs, other organs of echolocation, were also identified and labelled thanks to different MRI acquisitions. The shape, the location, the type of MRI signal of each organ and of their different connections were successfully analysed on all images, and then, the images of the head fresh or after thawing were compared. No impacts of the freezing/thawing cycle on the fatty tissues of the head were identified. Different parts were distinguished in the melon on the basis of the MRI signal emitted, corresponding most likely to the internal and external melon already identified by other analytical approaches, and linked to differences in lipid composition. MRI is shown here to be a useful tool to study the functional anatomy of the organs responsible for echolocation in odontocetes, with a particularly high level of precision.
[Mh] Termos MeSH primário: Tecido Adiposo/anatomia & histologia
Golfinhos Comuns/anatomia & histologia
Cabeça/diagnóstico por imagem
Imagem por Ressonância Magnética/veterinária
Tomografia Computadorizada por Raios X/veterinária
[Mh] Termos MeSH secundário: Tecido Adiposo/diagnóstico por imagem
Animais
Ecolocação/fisiologia
Cabeça/anatomia & histologia
Imagem por Ressonância Magnética/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170803
[Lr] Data última revisão:
170803
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161220
[St] Status:MEDLINE
[do] DOI:10.1111/ahe.12258


  4 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27851763
[Au] Autor:Cruz MJ; Menezes G; Machete M; Silva MA
[Ad] Endereço:Departamento de Oceanografia e Pescas, Universidade dos Açores, 9901-862, Horta, Portugal.
[Ti] Título:Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna Fishery in the Azores.
[So] Source:PLoS One;11(11):e0164107, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Common dolphins (Delphinus delphis) are responsible for the large majority of interactions with the pole-and-line tuna fishery in the Azores but the underlying drivers remain poorly understood. In this study we investigate the influence of various environmental and fisheries-related factors in promoting the interaction of common dolphins with this fishery and estimate the resultant catch losses. We analysed 15 years of fishery and cetacean interaction data (1998-2012) collected by observers placed aboard tuna fishing vessels. Dolphins interacted in less than 3% of the fishing events observed during the study period. The probability of dolphin interaction varied significantly between years with no evident trend over time. Generalized additive modeling results suggest that fishing duration, sea surface temperature and prey abundance in the region were the most important factors explaining common dolphin interaction. Dolphin interaction had no impact on the catches of albacore, skipjack and yellowfin tuna but resulted in significantly lower catches of bigeye tuna, with a predicted median annual loss of 13.5% in the number of fish captured. However, impact on bigeye catches varied considerably both by year and fishing area. Our work shows that rates of common dolphin interaction with the pole-and-line tuna fishery in the Azores are low and showed no signs of increase over the study period. Although overall economic impact was low, the interaction may lead to significant losses in some years. These findings emphasize the need for continued monitoring and for further research into the consequences and economic viability of potential mitigation measures.
[Mh] Termos MeSH primário: Golfinhos Comuns/fisiologia
Ecossistema
Pesqueiros
Atum/fisiologia
[Mh] Termos MeSH secundário: Animais
Açores
Modelos Teóricos
Probabilidade
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170626
[Lr] Data última revisão:
170626
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161117
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0164107


  5 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27769556
[Au] Autor:Monteiro SS; Pereira AT; Costa É; Torres J; Oliveira I; Bastos-Santos J; Araújo H; Ferreira M; Vingada J; Eira C
[Ad] Endereço:Departmento de Biologia & Centro de Estudos do Ambiente e do Mar (CESAM), Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Sociedade Portuguesa de Vida Selvagem, Universidade do Minho, Departamento de Biologia, Campus de Gualtar, 4710-057 Braga, Portugal. Elec
[Ti] Título:Bioaccumulation of trace element concentrations in common dolphins (Delphinus delphis) from Portugal.
[So] Source:Mar Pollut Bull;113(1-2):400-407, 2016 Dec 15.
[Is] ISSN:1879-3363
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The common dolphin (Delphinus delphis) is one of the most abundant species in Atlantic Iberia, representing a potentially important tool to assess the bioaccumulation of trace elements in the Iberian marine ecosystem. Nine elements (As, Cd, Cu, Hg, Mn, Ni, Pb, Se and Zn) were evaluated in 36 dolphins stranded in continental Portugal. Dolphins had increasing Hg concentrations (16.72µg·g ww, liver) compared with previous studies in Atlantic Iberia, whereas Cd concentrations (2.26µg·g ww, kidney) fell within reported ranges. The concentrations of some trace elements (including Cd and Hg) presented positive relationships with dolphin length, presence of parasites and gross pathologies. Common dolphins may help biomonitoring more offshore Atlantic Iberian areas in future studies, which would otherwise be difficult to assess.
[Mh] Termos MeSH primário: Cádmio/análise
Golfinhos Comuns/metabolismo
Monitoramento Ambiental/métodos
Mercúrio/análise
Oligoelementos/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Animais
Cádmio/metabolismo
Ecossistema
Feminino
Rim/química
Fígado/química
Masculino
Mercúrio/metabolismo
Portugal
Oligoelementos/metabolismo
Poluentes Químicos da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Trace Elements); 0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium); FXS1BY2PGL (Mercury)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161023
[St] Status:MEDLINE


  6 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27599576
[Au] Autor:Segura-García I; Gallo JP; Chivers S; Díaz-Gamboa R; Hoelzel AR
[Ad] Endereço:School of Biological and Biomedical Sciences, Durham University, Durham, UK.
[Ti] Título:Post-glacial habitat release and incipient speciation in the genus Delphinus.
[So] Source:Heredity (Edinb);117(6):400-407, 2016 Dec.
[Is] ISSN:1365-2540
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The role of ecological and changing environmental factors in the radiation of species diversity is a fundamental question in evolutionary biology. Of particular interest is the potential for these factors to determine the boundary between what we would consider differentiation among populations and incipient speciation. Dolphins in the genus Delphinus provide a useful test case, exhibiting morphological variation in beak length, coloration and body size across their wide geographic distribution, and in particular among coastal and more pelagic habitats. Two species have been proposed, D. delphis and D. capensis, but morphologically similar allopatric populations are not monophyletic, indicating that the mostly coastal 'long-beaked' D. capensis form is not a single globally distributed species. However, the sympatric populations in the Eastern North Pacific currently designated as these two species are both morphologically and genetically differentiated. Here we use microsatellite DNA and mitochondrial DNA markers to investigate the evolutionary mechanisms that led to this incipient speciation event. We used coalescent and assignment methods to investigate the timing and extent of reproductive isolation. Our data indicate that although there is some level of on-going gene flow, the putative species found in the Eastern North Pacific are reciprocally monophyletic. The timing of isolation appears to be associated with regional changes in paleoceanographic conditions within the Holocene timeframe.
[Mh] Termos MeSH primário: Golfinhos Comuns/classificação
Ecossistema
Especiação Genética
[Mh] Termos MeSH secundário: Animais
California
Golfinhos Comuns/genética
DNA Mitocondrial/genética
Fluxo Gênico
Marcadores Genéticos
Haplótipos
México
Repetições de Microssatélites
Oceano Pacífico
Filogenia
Dinâmica Populacional
Isolamento Reprodutivo
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Mitochondrial); 0 (Genetic Markers)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170626
[Lr] Data última revisão:
170626
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160908
[St] Status:MEDLINE
[do] DOI:10.1038/hdy.2016.66


  7 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26610944
[Au] Autor:Ary W; Cranford TW; Berta A; Krysl P
[Ad] Endereço:Department of Biology, San Diego State University, 2674 Russmar Drive, San Diego, CA, 92123-3422, USA. williamjamesary@gmail.com.
[Ti] Título:Functional Morphology and Symmetry in the Odontocete Ear Complex.
[So] Source:Adv Exp Med Biol;875:57-64, 2016.
[Is] ISSN:0065-2598
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Odontocete ear complexes or tympanoperiotic complexes (TPCs) were compared for asymmetry. Left and right TPCs were collected from one long-beaked common dolphin (Delphinus capensis) and one Amazon River dolphin (Inia geoffrensis). Asymmetry was assessed by volumetric comparisons of left and right TPCs and by visual comparison of superimposed models of the right TPC to a reflected mirror image of the left TPC. Kolmogorov-Smirnov tests were performed to compare the resonant frequencies of the TPCs as calculated by vibrational analysis. All analyses found slight differences between TPCs from the same specimen in contrast to the directional asymmetry in the nasal region of odontocete skulls.
[Mh] Termos MeSH primário: Golfinhos Comuns/anatomia & histologia
Golfinhos/anatomia & histologia
Orelha/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1606
[Cu] Atualização por classe:161109
[Lr] Data última revisão:
161109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151128
[St] Status:MEDLINE
[do] DOI:10.1007/978-1-4939-2981-8_7


  8 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:26559411
[Au] Autor:Cunha HA; de Castro RL; Secchi ER; Crespo EA; Lailson-Brito J; Azevedo AF; Lazoski C; Solé-Cava AM
[Ad] Endereço:Laboratório de Mamíferos Aquáticos e Bioindicadores (MAQUA), Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
[Ti] Título:Molecular and Morphological Differentiation of Common Dolphins (Delphinus sp.) in the Southwestern Atlantic: Testing the Two Species Hypothesis in Sympatry.
[So] Source:PLoS One;10(11):e0140251, 2015.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The taxonomy of common dolphins (Delphinus sp.) has always been controversial, with over twenty described species since the original description of the type species of the genus (Delphinus delphis Linnaeus, 1758). Two species and four subspecies are currently accepted, but recent molecular data have challenged this view. In this study we investigated the molecular taxonomy of common dolphins through analyses of cytochrome b sequences of 297 individuals from most of their distribution. We included 37 novel sequences from the Southwestern Atlantic Ocean, a region where the short- and long-beaked morphotypes occur in sympatry, but which had not been well sampled before. Skulls of individuals from the Southwestern Atlantic were measured to test the validity of the rostral index as a diagnostic character and confirmed the presence of the two morphotypes in our genetic sample. Our genetic results show that all common dolphins in the Atlantic Ocean belong to a single species, Delphinus delphis. According to genetic data, the species Delphinus capensis is invalid. Long-beaked common dolphins from the Northeastern Pacific Ocean may constitute a different species. Our conclusions prompt the need for revision of currently accepted common dolphin species and subspecies and of Delphinus delphis distribution.
[Mh] Termos MeSH primário: Golfinhos Comuns/genética
[Mh] Termos MeSH secundário: Animais
Oceano Atlântico
Golfinhos Comuns/anatomia & histologia
Golfinhos Comuns/classificação
Variação Genética
Haplótipos
Dados de Sequência Molecular
Filogenia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1606
[Cu] Atualização por classe:151120
[Lr] Data última revisão:
151120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151113
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0140251


  9 / 63 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26377013
[Au] Autor:Pinela AM; Borrell A; Aguilar A
[Ad] Endereço:Department of Animal Biology and Biodiversity Research Institute (IrBio), University of Barcelona, Barcelona, Spain.
[Ti] Título:Variation in δ15 N and δ13 C stable isotope values in common dolphins (Delphinus spp.) worldwide, with particular emphasis on the eastern North Atlantic populations.
[So] Source:Rapid Commun Mass Spectrom;29(9):855-63, 2015 May 15.
[Is] ISSN:1097-0231
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:RATIONALE: Distinguishing population units of small cetaceans continuously distributed in a widespread area is challenging but critical for their conservation and management. The use of chemical markers allows the investigation of foraging ecology and inter-specific variability, in order to detect population structure and niche segregation in the common dolphin (Delphinus spp.). METHODS: The stable isotope ratios of carbon (δ(13)C values) and nitrogen (δ(15)N values) were measured in the bone tissue of common dolphins accidentally by-caught or stranded along the north-eastern and eastern Subtropical Atlantic Ocean, by means of continuous flow elemental analyser/isotope ratio mass spectrometry. Trophic positions were determined and compared, taking into account the local ecosystem trophic baseline for each study area. Data obtained for the study areas were qualitatively compared with those for common dolphin species/populations distributed worldwide. RESULTS: The δ(13)C and δ(15)N values were higher in the eastern Subtropical Atlantic as a consequence of the coexistence in the area of the common dolphin short- and long-beaked morphotypes. Individuals from the north-eastern Atlantic displayed lower δ(15)N values, reflecting dissimilarities in diet and variation in local isotopic baselines. Comparisons with other areas around the world suggest that the species is extremely adaptive and feeds at different trophic levels to adapt to local variations. CONCLUSIONS: Stable isotopes are a useful tool to investigate population structure and trophic niche segregation. The trophic behaviour of worldwide populations of common dolphins was fruitfully analysed and revealed substantial differences, probably reflective of both adaptive strategies of the genus and dissimilarities in the structure of the ecosystems.
[Mh] Termos MeSH primário: Isótopos de Carbono/análise
Golfinhos Comuns/metabolismo
Isótopos de Nitrogênio/análise
[Mh] Termos MeSH secundário: Animais
Oceano Atlântico
Feminino
Masculino
Espectrometria de Massas
Crânio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Carbon Isotopes); 0 (Nitrogen Isotopes)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:150917
[Lr] Data última revisão:
150917
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150918
[St] Status:MEDLINE
[do] DOI:10.1002/rcm.7173


  10 / 63 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:26156774
[Au] Autor:Berns GS; Cook PF; Foxley S; Jbabdi S; Miller KL; Marino L
[Ad] Endereço:Psychology Department, Emory University, Atlanta, GA, USA gberns@emory.edu.
[Ti] Título:Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe.
[So] Source:Proc Biol Sci;282(1811), 2015 Jul 22.
[Is] ISSN:1471-2954
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The brains of odontocetes (toothed whales) look grossly different from their terrestrial relatives. Because of their adaptation to the aquatic environment and their reliance on echolocation, the odontocetes' auditory system is both unique and crucial to their survival. Yet, scant data exist about the functional organization of the cetacean auditory system. A predominant hypothesis is that the primary auditory cortex lies in the suprasylvian gyrus along the vertex of the hemispheres, with this position induced by expansion of 'associative' regions in lateral and caudal directions. However, the precise location of the auditory cortex and its connections are still unknown. Here, we used a novel diffusion tensor imaging (DTI) sequence in archival post-mortem brains of a common dolphin (Delphinus delphis) and a pantropical dolphin (Stenella attenuata) to map their sensory and motor systems. Using thalamic parcellation based on traditionally defined regions for the primary visual (V1) and auditory cortex (A1), we found distinct regions of the thalamus connected to V1 and A1. But in addition to suprasylvian-A1, we report here, for the first time, the auditory cortex also exists in the temporal lobe, in a region near cetacean-A2 and possibly analogous to the primary auditory cortex in related terrestrial mammals (Artiodactyla). Using probabilistic tract tracing, we found a direct pathway from the inferior colliculus to the medial geniculate nucleus to the temporal lobe near the sylvian fissure. Our results demonstrate the feasibility of post-mortem DTI in archival specimens to answer basic questions in comparative neurobiology in a way that has not previously been possible and shows a link between the cetacean auditory system and those of terrestrial mammals. Given that fresh cetacean specimens are relatively rare, the ability to measure connectivity in archival specimens opens up a plethora of possibilities for investigating neuroanatomy in cetaceans and other species.
[Mh] Termos MeSH primário: Córtex Auditivo/anatomia & histologia
Vias Auditivas/anatomia & histologia
Golfinhos Comuns/anatomia & histologia
Stenella/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Imagem de Tensor de Difusão
Feminino
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1604
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150710
[St] Status:MEDLINE



página 1 de 7 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