oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Ecology and conservation of the endemic lizard Tropidurus hygomi in “restinga” habitats of the north coast of Bahia state, Brazil
Karina Vieira Martins,Eduardo José dos Reis Dias,Carlos Frederico Duarte da Rocha
Biotemas , 2010,
Abstract: “Restingas” are herbaceous/ shrubby coastal sand-dune habitats that cover great areas of Brazil, particularly along the Bahia state coast. The restingas are disturbed and are under strong pressure, mainly in northeastern Brazil. Fragmentation of the landscape and habitat loss within natural ecosystems are the factors which are mainly responsible for reduction of species diversity by extinction events. The goal of thepresent study was elucidate whether the conservation status of restinga habitats on the northern coast of Bahia state was interfering with microhabitat use by the endemic lizard Tropidurus hygomi. The results showed that the use of microhabitat resources by T. hygomi did not have any signifi cant differences in the four areas we chose for study. However, diverse factors of degradation were found to contribute indirectly to its habitat loss. The T. hygomi lizard is a generalist in its use of restinga microhabitats, and probably due the endemic condition, its conservation status is linked directly to conservation of the restinga habitats on the northern coast of Bahia state.
Frog species richness, composition and beta-diversity in coastal Brazilian restinga habitats
Rocha, CFD.;Hatano, FH.;Vrcibradic, D.;Van Sluys, M.;
Brazilian Journal of Biology , 2008, DOI: 10.1590/S1519-69842008000100014
Abstract: we studied the species richness and composition of frogs in 10 restinga habitats (sand dune environments dominated by herbaceous and shrubby vegetation) along approximately 1500 km of coastal areas of three brazilian states: rio de janeiro (grumari, maricá, massambaba, jurubatiba and grussaí), espírito santo (praia das neves and setiba) and bahia (prado and trancoso). we estimated b-diversity and similarity among areas and related these parameters to geographic distance between areas. all areas were surveyed with a similar sampling procedure. we found 28 frog species belonging to the families hylidae, microhylidae, leptodactylidae and bufonidae. frogs in restingas were in general nocturnal with no strictly diurnal species. the richest restinga was praia das neves (13 species), followed by grussaí and trancoso (eight species in each). the commonest species in the restingas was scinax alter (found in eight restingas), followed by aparasphenodon brunoi (seven areas). our data shows that richness and composition of frog communities vary consistently along the eastern brazilian coast and, in part, the rate of species turnover is affected by the distance among areas. geographic distance explained approximately 12% of species turnover in restingas and about 9.5% of similarity among frog assemblages. although geographic distance somewhat affects frog assemblages, other factors (e.g. historical factors, disturbances) seem to be also involved in explaining present frog assemblage composition in each area and species turnover among areas. the frog fauna along restinga habitats was significantly nested (matrix community temperature = 26.13°; p = 0.007). our data also showed that the most hospitable restinga was praia das neves and indicated that this area should be protected as a conservation unit. frog assemblage of each area seems to partially represent a nested subset of the original assemblage, although we should not ignore the importance of historical factors. this nestedn
Florística de um trecho de floresta de restinga no município de Guarapari, Espírito Santo, Brasil
Assis, André Moreira de;Thomaz, Luciana Dias;Pereira, Oberdan José;
Acta Botanica Brasilica , 2004, DOI: 10.1590/S0102-33062004000100016
Abstract: the paulo césar vinha state park (pcvsp), in setiba, guarapari municipality (es), is the best studied of all restinga conservation units in the state of espírito santo. but there is still much to be learned concerning the flora of some of the plant communities found here. from 1997 to 2000, plants were collected on random walks through approximately four hectares of forest that covers the outer beach ridges of the pcvsp. a total of 172 species were surveyed, belonging to 54 families. the most species-rich families are myrtaceae (25 spp.), bromeliaceae (14), orchidaceae (13), sapotaceae (10), lauraceae (7), and rubiaceae (7).the most common geographic distribution pattern, based on the literature, was that of atlantic coast species, followed by widespread species, species found on both the atlantic coast and in central brazil, disjunct species and those endemic to espírito santo. floristic similarity with other coastal areas is directly related to the distance between these areas. the presence of endemic and threatened species in the neighborhood of the park reinforces the need for effective conservation of this area and provides the incentive to create other conservation units in the restingas of espírito santo state.
Flora and phytosociology of an area of Restinga along the northern Coast of Bahia, Brazil
Christiano Marcelino Menezes,Flávia Delgado Santana,Vinicius Sancho A. Silva,Vanessa Iris Silva da Silva
Biotemas , 2012,
Abstract: Areas of restinga are geologically recent environments. The species that inhabit this type of ecosystem are typical of adjacent areas, such as rain forest, tabuleiro forest and caatinga, and form a diverse community of trees, shrubs and erect and prostrate herbs. The goal of this work was to evaluate the vegetation in an area of restinga located along Praia do Forte, in the state of Bahia, Brazil. Four 200m transects where made within five plots of 100m2 each, and 1,640 individuals within 68 species were collected. High species diversity was found in transects 1 and 2 (H′ = 3.882) and 3 and 4 (H′ = 3.835). The most representative families were Myrtaceae, Rubiaceae and Malpighiaceae. Based on the species composition, a significant difference (p < 0.001) was found between the sampled areas, and the findings show that there are two distinct plant communities in this region, Mata deRestinga and Restinga em Moitas.
Magnoliophyta species of restinga, state of Pernambuco, Brazil.  [PDF]
Zickel, C. S.,Almeida Jr., E. B.,Medeiros, D. P. W.,Lima, P. B.
Check List , 2007,
Abstract: Restinga vegetation occurs along the entire coast of Brazil. The 187 km of coastline of the state ofPernambuco demonstrates a diversity of habitats, such as beaches, dunes, and restingas. The present study sought toelaborate a checklist of the phanerogamic species found there. The species listed were compiled from surveysundertaken between 1951 and 2007, as well as from herbaria collections in that state. A total of 477 species distributedamong 303 genera and 95 families were encountered. The families with the greatest numbers of species were Poaceae(39 species), Fabaceae (34), Cyperaceae (26), Euphorbiaceae (25), Myrtaceae (24), Rubiaceae (20), Caesalpiniaceae(17), Mimosaceae (16), Asteraceae (14), Orchidaceae (14), Bromeliaceae (9), Boraginaceae (8), Malvaceae (8),Solanaceae (8), and Annonaceae, Araceae, Chrysobalanaceae, Malpighiaceae, and Melastomataceae (7 each).Approximately 60 % of the species were common to other restinga areas in northeastern Brazil, and 39.3 % wererestricted to the coast of Pernambuco.
Use of cacti as heat sources by thermoregulating Mabuya agilis (Raddi) and Mabuya macrorhyncha Hoge (Lacertflia, Scincidae) in two restinga habitats in southeastern Brazil
Vrcibradic, Davor;Rocha, Carlos Frederico Duarte;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000100005
Abstract: lizards may benefit from gain of heat from contact with the substrate via conduction. in this study, evidence that the lizards mabuya agilis (raddi, 1823) and mabuya macrorhynclui hoge, 1946 (scincidae) inhabiting two restinga habitats in southeastern brazil (grussaf, rio de janeiro and praia das neves, espfrito santo), may shift microhabitat preferences along the day, and that such shifts may be related to the use of cacti surfaces as direct sources of heat is presented. for both species, body temperature (tb) was always significantly correlated (p < 0,05) with air temperature (ta). tb was significantly correlated (p < 0,0.5) with substrate temperature (ts) for m. agilis collected on cacti, but not for specimens collected on the ground. for m. macrorhyncha collected on cacti, both ta and ts were more important in conjunction than separately, in explaining lizard tb. use of cacti as perches by m. agilis was more frequent during late afternoon when environmental temperatures are declining, but such a trend was not evident for m. macrorhynclui. we suggest that the use of cacti as direct heat sources may be more evident in the ground-dwelling m. agilis than in the scansorial m. macrorhynclui.
Bats from the Restinga of Praia das Neves, state of Espírito Santo, Southeastern Brazil  [PDF]
Luz, J. L.,Costa, L. M.,Louren?o, E. C.,Gomes, L. A. C.
Check List , 2009,
Abstract: Studies on bat richness and diversity in coastal sand dunes (‘restinga’) are still scarce. Therefore, the objectives of thepresent study were to estimate bat richness in the restinga of Praia das Neves (state of Espírito Santo, southeasternBrazil) and to analyze species abundance. Ten sampling nights were carried out in May and July 2008, resulting in asampling effort of 21,847.5 h.m2. We captured 125 individuals from 17 bat species. In this study, Tonatia saurophilawas recorded for the first time not only in the state of Espírito Santo but also in the restinga ecosystem. The mostabundant species was Artibeus lituratus with 32% of all captures. Surveys in coastal restingas are urgently needed inorder to obtain more information about the bats living in this environment.
Heterogeneidade florística das fitocenoses de restingas nos estados do Rio de Janeiro e Espírito Santo, Brasil
Magnago, Luiz Fernando Silva;Martins, Sebasti?o Venancio;Pereira, Oberdan José;
Revista árvore , 2011, DOI: 10.1590/S0100-67622011000200009
Abstract: this study aimed to compare the flora of the vegetation formations that compose the restinga ecosystem in the states of rio de janeiro and espírito santo, brazil. the compile data about floristic and phytosociological was carried, using the jaccard similarity index, in which the interpretations were given by the unweighted pair group method with arithmetic mean (upgma). 11 configurations analyzed totalize 990 species belonging to 141 families, being the richest families: "fabaceae (73), myrtaceae (59), rubiaceae (48), orchidaceae (44), cyperaceae (38), poaceae (36), bromeliaceae (35), euphorbiaceae (30), and asteraceae (30)". the similarity among areas was low, with the highest value of 33%. the results reflected high floristic heterogeneity in the formations that compose the restinga ecosystem in those states, and this heterogeneity caused by different factors that act on each plant communities (phytocenoses).
Varia o na estrutura e na composi o de Bromeliaceae em cinco zonas de restinga no Parque Nacional da Restinga de Jurubatiba, Macaé, RJ
COGLIATTI-CARVALHO LUCIANA,FREITAS ANDRé FELIPPE NUNES DE,ROCHA CARLOS FREDERICO DUARTE DA,VAN SLUYS MONIQUE
Brazilian Journal of Botany , 2001,
Abstract: Estudamos as bromeliáceas do Parque Nacional da Restinga de Jurubatiba, Macaé, RJ, nas cinco diferentes zonas de vegeta o: psamófila halófila reptante (PHR), fechada pós-praia (FPP), arbustiva aberta de Clusia (AAC), arbustiva aberta de ericácea (AAE) e mata periodicamente inundada (MPI). Analisamos abundancia, densidade, biomassa, riqueza, diversidade, equitabilidade e similaridade de espécies entre as zonas. Estimamos a quantidade de água reservada no interior das bromélias por zona de restinga e por espécie de bromélia. Em 98 parcelas de 100 m2 (10 X 10 m) cada, registramos as espécies de bromélias, a abundancia de cada espécie e a zona amostrada. A quantidade de água armazenada e a biomassa das bromélias foram estimadas medindo-se o volume de água reservada no vaso e pesando 10 indivíduos por espécie. Encontramos 10 espécies na restinga de Jurubatiba, com densidade total estimada de 10386 ind.ha-1. Na zona PHR, n o ocorreu nenhuma espécie de bromélia. Na FPP, ocorreu a maior biomassa total (7721,2 kg.ha-1), sendo Bromelia antiacantha a mais abundante e com maior biomassa (1366,5 kg.ha-1). Na AAE, ocorreu a maior densidade total (15725 ind.ha-1), diversidade (H' = 2,358), equitabilidade (0,786) e quantidade de água reservada no interior de bromélias (3294,8 L.ha-1). Na MPI, Aechmea bromeliifolia foi a mais abundante, sendo exclusiva desta zona. A maior similaridade ocorreu entre AAC e AAE (88,9%). Concluímos que a estrutura e a composi o de Bromeliaceae da restinga de Jurubatiba variam fortemente entre as zonas estudadas, com cada zona possuindo um conjunto particular de espécies com diferentes distribui es de abundancia.
The remnants of restinga habitats in the brazilian Atlantic Forest of Rio de Janeiro state, Brazil: habitat loss and risk of disappearance
Rocha, CFD.;Bergallo, HG.;Van Sluys, M.;Alves, MAS.;Jamel, CE.;
Brazilian Journal of Biology , 2007, DOI: 10.1590/S1519-69842007000200011
Abstract: "restingas" (herbaceous/shrubby coastal sand-dune habitats) used to cover most of rio de janeiro state coast, and have suffered extensive degradation over the last five centuries. using satellite images and field work, we identified the remaining restingas in the state, recording the factors that might cause their degradation. we used two mosaics of landsat 7 scenes (spatial resolution 15 and 30 m) to map and evaluate preliminarly the remaining areas and conservation status. each remnant area was checked in the field, degraded areas within it were mapped and subtracted from the remnants. we identified 21 restinga remnants totalling 105,285 ha. the largest and smallest restinga remnants were jurubatiba (25,141 ha) and itaipu (23 ha), respectively. we identified 14 causes of degradation. the most important were vegetation removal for housing developments, establishment of exotic plant species, change of original substrate, and selective removal of species of economic importance for the horticultural industry. all restingas had disturbed parts under strong pressure due to human activities. due to intense habitat loss, and occurrence of endemic/threatened vertebrate species in restinga habitats, we strongly indicate the implementation of new conservation units to protect these fragile remnants. this habitat is steadily decreasing and most remnants lack legal protection. therefore, under the current human pressure most of this unique habitat is likely to be lost from the state within the next few years.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.