Página 1 dos resultados de 12 itens digitais encontrados em 0.003 segundos

Musculo vasto lateral obliquo correlações anatomo-clinicas

Debora Bevilaqua Grosso
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 09/02/1996 PT
Relevância na Pesquisa
16.91%
Trinta e duas coxas foram dissecadas com o objetivo de se estudar as duas porções do músculo vasto lateral e os respectivos ângulos de inserção na patela, bem como suas relações com as estruturas associadas: retináculo lateral e tracto iliotibial. De acordo com os resultados obtidos, o músculo vasto lateral divide se em duas porções: uma longa e proximal, o vasto lateral longo e outra oblíqua e distal, o vasto lateral oblíquo. O músculo vasto lateral oblíquo origina-se da linha áspera do fêmur e septo intermuscular lateral inserindo-se por tendão próprio, o qual dirige-se inferior e lateralmente ao músculo vasto lateral longo, unindo-se a este na borda superolateral da patela, freqüentemente unido à cápsula articular. As fibras distais do músculo vasto lateral oblíquo apresentaram-se interdigitadas no retináculo lateral e tracto iliotibial. A porção superficial do músculo vasto lateral oblíquo mediu em média 8,95cm e as porções distal e proximal do seu ventre muscular distaram respectivamente 2,2cm e 11, 15cm do epicôndilo lateral. Os ângulos de inserção na patela foram, em média, de 13,6 graus para o músculo vasto lateral longo e 50,4 graus para o músculo vasto lateral oblíquo. Através dos resultados...

Biologia e ecologia do percebe Pollicipes pollicipes (Gmelin, 1790), no litoral sudoeste portugês

Cruz, Teresa Paula Gonçalves
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Tese de Doutorado
POR
Relevância na Pesquisa
26.41%
"Sem resumo feito pelo autor"; Pollicipes pollicipes (Gmelin, 1790), cujo nome vulgar é percebe, é um crustáceo cirrípede que se distribui sobretudo na zona intertidal de substrato duro de Portugal Continental. No nosso país, o percebe é o recurso económico mais importante da zona entre marés. No entanto, com excepção da Reserva Natural da Berlenga e das áreas portuárias em geral, onde a apanha do percebe é proibida, não existe qualquer regulamentação da sua apanha e comercialização. É opinião generalizada, especialmente dos apanhadores de percebes, que a sua abundância nesta costa tem sofrido uma considerável diminuição nas últimas décadas, sobretudo no respeitante aos exemplares de maior dimensão. Apesar de a sua distribuição geográfica ser extensa (desde a Bretanha, em França, até ao Senegal, sendo raros no Mediterrâneo), os estudos sobre a sua biologia, em geral, e a sua ecologia, em particular, são pouco abundantes. Os objectivos gerais deste trabalho consistiram no estudo dos padrões de distribuição, abundância, reprodução, recrutamento e crescimento desta espécie no litoral sudoeste português. Com algumas excepções, a maior parte das respectivas amostragens foram realizados no Cabo de Sines e no Cabo Sardão...

As lapas (Patella aspera Röding, 1798) como habitat de macroalgas

Furtado, Miguel Aguiar, 1991-
Fonte: Universidade de Lisboa Publicador: Universidade de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2013 POR
Relevância na Pesquisa
67.55%
Tese de mestradoBiologia (Ecologia Marinha)Universidade de Lisboa, Faculdade de Ciências, 2013; Embora as lapas possam controlar a distribuição e abundância de algas e outros organismos, as suas conchas podem oferecer um substrato disponível e um refúgio para o estabelecimento de diversas espécies, especialmente em ambientes onde a competição por espaço é elevada, como é o caso dos Açores. Este trabalho foi o primeiro a identificar o epibiota e a caracterizar a sua respectiva percentagem de cobertura nas conchas da lapa Patella aspera nos Açores testando o número de taxa presentes e a sua percentagem de cobertura em função do tamanho da concha, bem como a composição do epibiota em função da localização do basibionte nos diferentes grupos do arquipélago (separados por centenas de quilómetros), nas diferentes ilhas de cada grupo (separadas por dezenas de quilómetros) e entre locais da mesma ilha e grupo (separados por quilómetros). Foram colectados 707 indivíduos de P. aspera em dois locais de cada uma das nove ilhas do arquipélago dos Açores nos meses de verão (Junho a Setembro) de dois anos consecutivos. As conchas foram medidas, os epibiontes presentes foram identificados e quantificados ao nível da espécie enquanto...

Exploitation of rocky intertidal grazers: population status and potential impacts on community structure and functioning.

Martins, Gustavo M.; Jenkins, Stuart R.; Hawkins, Stephen J.; Neto, Ana I.; Thompson, Richard C.
Fonte: Inter Research Publicador: Inter Research
Tipo: Artigo de Revista Científica
Publicado em /07/2008 ENG
Relevância na Pesquisa
26.65%
Copyright © Inter-Research 2008.; A wide range of anthropogenic activities are impacting the ecology of coastal areas. Exploitation of marine resources is one such activity, which, through cascading trophic effects, can have influences well beyond that of the target species. We investigated the mid-rocky-shore community structure of the Azores archipelago, a seldom-studied habitat, where there is a local tradition of exploiting limpets, the main intertidal grazers. The limpet population structure differed among islands, and there was an inverse relationship between the abundance of larger limpets and the human population per coastal perimeter, but not the associated catch data. At small scales of resolution (quadrats), there was a negative relationship between the cover of algae and limpets and a positive relationship between barnacles and limpets. These relationships were also apparent at the larger scale of islands as a function of the gradient of exploitation. Our results show how natural habitat fragmentation may be useful where the experimental testing of a hypothesis is not possible, and provide evidence for the trophic cascading effects of limpet exploitation at landscape scales.

Illegal harvesting affects the success of fishing closure areas.

Martins, Gustavo M.; Jenkins, Stuart R.; Hawkins, Stephen J.; Neto, Ana I.; Medeiros, André; Thompson, Richard C.
Fonte: Marine Biological Association of the United Kingdom Publicador: Marine Biological Association of the United Kingdom
Tipo: Artigo de Revista Científica
Publicado em /06/2011 ENG
Relevância na Pesquisa
26.65%
Copyright © Marine Biological Association of the United Kingdom 2010.; There is clear evidence that marine reserves can be used as effective tools to foster the recovery of disturbed ecosystems. In the Azores, intense exploitation of the patellid limpets Patella candei and P. aspera has led to a rapid decline in their populations and subsequent collapse of the fishery in 1985. In 1993, legislation was passed to protect limpets, including the establishment of limpet protected zones (LPZs) where harvesting was completely prohibited. Outside LPZs, a seasonal fishing closure prohibited the harvesting of limpets from October to May. Here we examine the effect of such measures 16 years after they were put into practice. In each of the 3 years examined, limpet density, biomass and size were generally similar both inside and outside the LPZs. In addition, there were clear signs of exploitation as most individual limpets inside the LPZ were smaller than the legal catch size suggesting that illegal harvesting was taking place. Observations confirmed that illegal harvesting of limpets was common both inside and outside LPZs. Lack of enforcement of regulations is therefore a likely reason for the failure of legislation to protect limpet populations and facilitate stock recovery.

Temporal variation in reproductive phenology of Patella spp.: past and present.

Vale, Maria; Ribeiro, Pedro; Golbold, J.; Neto, Ana I.; Martins, Gustavo M.; Hawkins, Stephen J.
Fonte: Sociedade Afonso Chaves Publicador: Sociedade Afonso Chaves
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
57.29%
World Congress of Malacology, Universidade dos Açores, Ponta Delgada, 21-28 de julho.; Global changes occurring in the biogeochemistry o f the oceans may influence the ecology of the biota. There is evidence that species are reacting to changes in climate through variations in the abundance and phenology with many species showing a poleward shift in their distributional range. The rocky intertidal is a relatively simple ecosystem but highly susceptible to anthropogenic activities and is thus an excellent model system for the understanding of the consequences of change in climate. This study presents a preliminary analysis of the changes in gonad phenology of Patella aspera over time. Patella aspera is being collected in various locations of the São Miguel Island (Azores) and their gonad development assessed visually using a trained observer. These data are then compared to unpublished data on gonad development collected in the period of 1985-1987 through a chi-square test of independence. Overall, in contrast to the period of 1985-87, there was a much lower number of individuals reaching maturity (gonad development stages IV and V) in 2012-2013 and there was no clear peak in spawning. In addition, the resting period appears to be starting in june...

Shell variation in Patellid limpets: scales of spatial variability

Martins, Gustavo M.; Faria, João; Furtado, Miguel; Enes, Manuel; Neto, Ana I.
Fonte: Sociedade Afonso Chaves Publicador: Sociedade Afonso Chaves
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
37.38%
World Congress of Malacology, Universidade dos Açores, Ponta Delgada, 21-28 de julho.; Species o f the genera Patella generally display a high degree of shell variation, which is thought to be an adaptation to environmental conditions. The present work examines the variation in the morphometry of the two patellid limpets present in the Azores (Patella candei and P. aspera) at multiple spatial scales. Individuals of both patellid species were collected on two sites in each of the nine islands of the Azores. All individuals were measured to estimate base ellipticity, base eccentricity, conicity and cone eccentricity. Shell variation in P. candei was consistent among groups of islands (eastern, central, western) but there was significant variation in shell morphometry at the scales of islands and sites. Components of variation showed that a substantial proportion of variation was associated with the scale of individuais. Shell variation in P. aspera was consistent at the scale of island groups and islands but there was significant variation among sites. Analysis of the components of variability showed that variability in shell morphometrv was mostly associated with differences among individuais. Overall, these results suggest that variation in shell morphometry in the two patellid is not influenced by large scale processes as would be expected given that P. candei and P. aspera both have a pelagic Iarvae. In addition...

Conservation of limpet populations: a heavily exploited resource in Azores, NE-Atlantic

Faria, João; Ribeiro, Pedro; Martins, Gustavo M.; Rivas, Manuel; Hawkins, Stephen J.; Presa, Pablo; Neto, Ana I.
Fonte: Universidade dos Açores Publicador: Universidade dos Açores
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 ENG
Relevância na Pesquisa
26.65%
10th International Temperate Reefs Symposium, The University of Western Australia, 12-17 de janeiro.; Limpet harvesting in Azores (NE Atlantic) has been taking place probably since the islands were first colonized in the XV century. Limpet species are highly exploited and populations from most islands have declined steadily bringing about catastrophic effects on coastal communities. Despite their economic importance limpets are also ecologically key species and require prioritizing conservation strategies. Patellid limpets are broadcast spawners which go through a planktonic larval stage in their life cycle. They are benthic as adults and the larva is the only phase during their life-cycle which has the ability to disperse over assumed large spatial distances. However, there is now mounting evidence that gene flow between islands and mainlands can be low, even for species with a relatively long planktonic larval stage. Low levels of larval exchange may thus limit the success of conservation objectives expected upon migration and recruitment. In dispersive isolated oceanic islands such as the Macaronesian Islands, the Azores Archipelago in particular, is not clear whether limpet populations from different islands form a single meta-population or...

Genetic population structure and connectivity of Azorean limpets

Faria, João; Presa, Pablo; Martins, Gustavo M.; Ribeiro, Pedro; Neto, Ana I.
Fonte: Universidade dos Açores Publicador: Universidade dos Açores
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 ENG
Relevância na Pesquisa
26.41%
Ocean Science Meeting. Hawaii Convention Center, Honolulu, Hawaii, USA, 23-28 de Fevereiro.; There is growing consensus that anthropogenic activities significantly rarefy the structure and functioning of marine ecosystems. Oceanic islands such as the Azores (NE Atlantic) constitute unique habitats with fragile communities, which are highly susceptible to degradation and ecosystem disruption. . Patellid limpets have traditionally been collected as a food resource and in 1988 the limpet fishery in São Miguel Island collapsed, and after a one-year ban throughout the archipelago, the stocks were allowed to recover, avoiding catastrophic overexploitation effects. In 1993, legislation was passed to protect this resource, i.e. limpet no-take areas were created, seasonal harvesting restrictions were applied and minimum legal catch sizes were established. However, a recent survey has shown that limpet populations still show clear signs of overexploitation and some populations are virtually extinct in some islands. Here we have developed new multiplexed and described microsatellite markers for the species Patella aspera and P. candei and have examined their genetic diversity, gene flow and population connectivity in the Azores Archipelago. Overall...

A new multiplexed microsatellite tool for metapopulation studies in the overexploited endemic limpet Patella aspera (Röding, 1798)

Faria, João; Rivas, Manuel; Martins, Gustavo M.; Hawkins, Stephen J.; Ribeiro, Pedro; Pita, Alfonso; Neto, Ana I.; Presa, Pablo
Fonte: Wiley / Stichting International Foundation for Animal Genetics Publicador: Wiley / Stichting International Foundation for Animal Genetics
Tipo: Artigo de Revista Científica
Publicado em //2015 ENG
Relevância na Pesquisa
67.38%
Patellid limpets are ecologically important keystone grazers having a long history of overexploitation in the Macaronesian Archipelagos (NE Atlantic islands), where some species, such as Patella aspera, are under serious risk.[1, 2] Patella aspera is a protandric sequential hermaphrodite species with external fertilization, in which individuals start off as males but may undergo a sex reversal with age.[3] Hence, exploitation tends to focus on the larger females in the population as larger limpets (predominantly females) are selectively removed. Despite conservation legislation in Canaries, Madeira and Azores, limpets are under severe pressure and few individuals survive long enough to become females, a phenomenon that severely restricts the effective population size.[4] New conservation actions for the protection and sustainable use of limpets in Macaronesian Archipelagos are urgently needed and should be based on a multidisciplinary framework based on knowledge of the population dynamics and connectivity of this species.

Shells of the limpet Patella aspera as habitat for epibionts

Faria, João; Martins, Gustavo M.; Furtado, Miguel; Neto, Ana I.
Fonte: Sociedade Afonso Chaves Publicador: Sociedade Afonso Chaves
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
57.21%
World Congress of Malacology, Universidade dos Açores, Ponta Delgada, 21-28 de julho.; Although limpets can control the abund ance and distribution of algae and other organisms, their shells can offer a refuge for the establishment of diverse assemblage that would otherwise be excluded. In this study, we make a preliminary analysis of the epibiota growing on shells of the limpet Patella aspern. Individuals of P. aspera were collected in all islands of the Azores and the biota on their shells was identified and quantified to species leveli. A total of 144 species was identified. The composition of the epibiota assemblage varied among islands and among locations within islands. There was also significant variation in epibiota richness at the scale of locations, but not at the scale of islands. A positive and highly significant correlation was also found between epibiota richness and shell length. This study adds to the literature by showing that the shells of P. aspern, an over-exploited species in the Azores, support a very rich community of algae and invertebrates and that this is controlled by processes operating at multiple spatial scales ranging from metres (among individuals) to 100's of kilometers (among islands).

Development and characterization of microsattelite Loci for the harvested limpets Patella Candei (D'orbigny, 1839) and Patella Aspera (Röding, 1798) using 454 sequencing

Rivas, Manuel; Faria, João; Ribeiro, Pedro; Presa, Pablo; Martins, Gustavo M.; Neto, Ana I.
Fonte: Sociedade Afonso Chaves Publicador: Sociedade Afonso Chaves
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
67.48%
World Congress of Malacology, Ponta Delgada, July 22-28, 2013.; There is growing consensus that anthropogenic activities are impacting the structure and functioning of marine ecosystems and that these can have profound community level effects, particularly when targeting keystone species. Limpet harvesting in Azores (NE Atlantic) has been taking place probably since the islands were first colonized. These species are highly exploited and the stocks in most islands have declined steadily with catastrophic effects on coastal communities. They are a locally important resource but also ecologically important species and require prioritizing conservation strategies. Such strategies should be su pported by reliable data on the structure and dynamics of their populations, so that ecological hotspots are identified and protected. Characterizing the genetic diversity and structure of marine exploited populations is thus of paramount importance to identify such units of conservation. Here we describe and develop species-specific microsatellite markers for the harvested limpets Patella candei and Patella aspera using whole genome shotgun 454 sequencing. A total of 309 bioinformatic-validated pairs of primers were obtained from P. aspera microsatellite enriched library. The optimization of the amplification conditions of selectect microsatellites (simplex and multiplex reactions) was performed in a gradient thermal cycler to optimize locus-specific amplification conditions and test their utility as genetic markers. Forty pairs of primers were tested...