Entity

Time filter

Source Type

Lisbon, Portugal

Elias R.B.,3nter for Ecology | Dias E.,University of The Azores
Phytotaxa | Year: 2014

Based on morphological, genetic and ecological data, we describe new infraspecific taxa of the Azorean endemic Juniperus brevifolia. J. brevifolia subsp. maritima is an erect shrub or small tree, found in Flores, Terceira, Pico and São Jorge , in coastal scrubs below 100 m. J. brevifolia subsp. brevifolia occurs in all islands of the archipelago except Graciosa, between 300 and 1500 m. J. brevifolia subsp. brevifolia var. brevifolia is a small to medium tree found between 300 and 1000 m. J. brevifolia subsp. brevifolia var. montanum is a small prostrate shrub, common in mountain scrubs and blanket bogs, between 850 and 1500 m. The most striking morphological differences of subsp. maritima are the larger leaves, seed cones and seeds. Phenological patterns of the subspecies also differ, notably in the periods of seed maturation and pollination. The distribution of taxa within islands is peripatric. Coastal populations (subsp. maritima) are small and isolated from the usually much larger subsp. brevifolia populations, above 300 m. In subsp. brevifolia the varieties are parapatric, since their ranges are adjacent to each other, occurring together in narrow contact zones. © 2014 Magnolia Press. Source


Marques S.,Federal University of Pernambuco | Barreiros J.P.,3nter for Ecology | Barreiros J.P.,University of The Azores
Pan-American Journal of Aquatic Sciences | Year: 2015

This report is about two feeding behaviors of the silver porgy Diplodus argenteus in two rock reefs systems from the south Atlantic in Brazil. This species was a bottom feeder, which exhibited occasional and opportunistic behaviors. Source


Lopes S.T.,University of Lisbon | Lopes S.T.,Center for Environmental and Marine Studies | Dourado C.G.,University of Lisbon | Dourado C.G.,Center for Environmental and Marine Studies | And 10 more authors.
Journal of the Entomological Research Society | Year: 2015

Due to the difficulties associated with morphological identification of insects, it became necessary to resort to other identification tools, such as DNA barcoding, where the mitochondrial cytochrome c oxidase subunit I (COI) molecular marker is commonly used. The effectiveness of DNA-based identification of species relies on the availability of sequences in public databases for comparison. Nevertheless, there is still a large number of non-sequenced species in these databases, preventing a molecular identification. In this study, we generate COI barcode sequences, with a total of 658 bp, for the six studied Chrysomelidae species. Phylogenetic and sequence divergence analyses were also performed, which allowed the discrimination of all species under study, supporting once again the suitability of this genetic marker. The obtained sequences were added to BOLD and GenBank databases, contributing to the increase of records in online databases and making the identification of some Chrysomelidae species easier. Source


Fattorini S.,3nter for Ecology | Fattorini S.,University of LAquila
Web Ecology | Year: 2016

Habitat fragmentation caused by urbanization is considered a prominent threat to biodiversity. Urban development creates a mosaic of natural fragments which can be occupied by organisms able to survive in small spaces. These fragments are a set of habitat islands separated by less suitable non-native habitats. Because of their isolation, communities of urban green spaces can be investigated using hypotheses developed in island biogeography. The "equilibrium theory of island biogeography" (ETIB) allows the formulation of some predictions about how various characteristics of green spaces (such as their area, shape, level of isolation, environmental heterogeneity, age) should influence species richness. Many studies found support for ETIB predictions, but results varied considerably according to the species' sensitivity to patch size, matrix characteristics, and history of the city. In some cases ETIB predictions were falsified. These contrasting results warn against making generalizations on conservation strategies only based on ETIB models. On the other hand, the ETIB may represent a useful framework for urban conservation, especially for small animals like insects, if the roles of other factors, such as the surrounding landscape, the specific needs of the species under study, and the history of the urbanization process, are taken into account. © 2016 Author(s). Source


Godinho S.,University of Evora | Gil A.,3nter for Ecology | Guiomar N.,University of Evora | Neves N.,New University of Lisbon | And 2 more authors.
Agroforestry Systems | Year: 2016

Mapping the land-cover pattern dominated by complex Mediterranean silvo-pastoral systems with an accuracy that enables precise monitoring of changing tree-cover density is still an open challenge. The main goal of this paper is to demonstrate the implementation and effectiveness of the Forest Canopy Density (FCD) model in producing a remote sensing-based and detailed map of montado canopy density over a large territory in southern Portugal. This map will make a fundamental contribution to accurately identifying and assessing High Nature Value farmland in montado areas. The results reveal that the FCD model is an effective approach to estimating the density classes of montado canopy (overall accuracy = 78.0 %, kappa value = 0.71). The study also shows that the FCD approach generated good user’s and producer’s accuracies for the three montado canopy-density classes. Globally, the results obtained show that biophysical indices such as the advanced vegetation index, the bare soil index, the shadow index and the thermal index are suitable for estimating and mapping montado canopy-density classes. These results constitute the first remote sensing-based product for mapping montado canopy density that has been developed using the FCD model. This research clearly demonstrates that this approach can be used in the context of Mediterranean agro-forestry systems. © 2014, Springer Science+Business Media Dordrecht. Source

Discover hidden collaborations