The conservation value of linear forest remnants in central Amazonia

Lima, Marcelo Gomes de; Gascon, Claude

doi:10.1016/s0006-3207(99)00084-1

Cited by 111 publications

(72 citation statements)

References 34 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Altered riparian forests are now common in agricultural landscapes of the southern Amazon and throughout much of Brazil (Lima and Gascon 1999, Lees and Peres 2008, Macedo et al 2013. This is because the Brazilian Forest Code mandates that land clearing practices leave standing at least 30 m of forest on both sides of streams less than 10 m wide to ''conserve hydrological functions, prevent soil erosion, support frontier defence, guarantee public health, protect sites of natural beauty and provide protection for rare native species of flora and fauna '' (Stickler et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Structure and composition of altered riparian forests in an agricultural Amazonian landscape

Nagy

Porder

Neill

et al. 2015

Ecological Applications

View full text Add to dashboard Cite

Abstract. Deforestation and fragmentation influence the microclimate, vegetation structure, and composition of remaining patches of tropical forest. In the southern Amazon, at the frontier of cropland expansion, forests are converted and fragmented in a pattern that leaves standing riparian forests whose dimensions are mandated by the Brazilian National Forest Code. These altered riparian forests share many characteristics of well-studied upland forest fragments, but differ because they remain connected to larger areas of forest downstream, and because they may experience wetter soil conditions because reduction of forest cover in the surrounding watershed raises groundwater levels and increases stream runoff. We compared forest regeneration, structure, composition, and diversity in four areas of intact riparian forest and four areas each of narrow, medium, and wide altered riparian forests that have been surrounded by agriculture since the early 1980s. We found that seedling abundance was reduced by as much as 64% and sapling abundance was reduced by as much as 67% in altered compared to intact riparian forests. The most pronounced differences between altered and intact forest occurred near forest edges and within the narrowest sections of altered riparian forests. Woody plant species composition differed and diversity was reduced in altered forests compared to intact riparian forests. However, despite being fragmented for several decades, large woody plant biomass and carbon storage, the number of live or dead large woody plants, mortality rates, and the size distribution of woody plants did not differ significantly between altered and intact riparian forests. Thus, even in these relatively narrow forests with high edge : area ratios, we saw no evidence of the increases in mortality and declines in biomass that have been found in other tropical forest fragment studies. However, because of the changes in both species community and reduced regeneration, it is unclear how long this relative lack of change will be sustained. Additionally, Brazil recently passed a law in their National Forest Code allowing narrower riparian buffers than those studied here in restored areas, which could affect their long-term sustainability.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure and composition of altered riparian forests in an agricultural Amazonian landscape

Nagy

Porder

Neill

et al. 2015

Ecological Applications

View full text Add to dashboard Cite

show abstract

“…Outras não são tolerantes aos distúrbios antrópicos e dependem diretamente das matas ciliares, como é o caso das ariranhas (Rosas et al 2008) e outras espécies aquáticas ou semi-aquáticas. Além de favorecer o deslocamento de indivíduos entre manchas de vegetação nativa, os corredores servem como habitat, abrigando populações de espécies nativas de mamíferos de menor porte (Lima & Gascon 1999), mas não de espécies exóticas ou invasoras (Naxara 2008). Pela influência direta dos rios e córregos e consequente minimização dos efeitos microclimáticos associados a bordas, os corredores ripários associados às RLs parecem ser particularmente adequados como habitat para espécies de pequenos mamíferos florestais (Naxara 2008).…”

Section: Introductionunclassified

Mudanças no Código Florestal e seu impacto na ecologia e diversidade dos mamíferos no Brasil

et al. 2010

View full text Add to dashboard Cite

legislative changes and their impacts on mammal ecology and diversity in Brazil. Biota Neotrop. 10(4): http://www.biotaneotropica.org.br/v10n4/en/abstract?article+bn00710042010.Abstract: Forest ecosystems within Brazil host one of the highest levels of mammalian diversity on Earth, much of which within legally required forest set-asides in private landholdings. The Legal Reserves (RLs) and Permanent Protected Areas (APPs) of the Brazilian Forest Code provide an important strategy to maintain this diversity. Yet a proposed amendment to Brazil's 1965 forestry code would reduce protection of Brazil's forests, including the Amazon and the Atlantic forest, and bring irreversible detrimental effects to mammal diversity. Mammals are key components of forest ecosystem, providing important environmental services as pollinators, seed dispersers and ecosystem engineers. The local extinction of some species will negatively affect forest ecosystem service provisioning throughout the country. Another important effect of forest conversion within private properties, should the proposed changes happen, will be the emergence of new diseases, bringing serious public health problems in Brazil. Resumo: Os ecossistemas florestais do Brasil abrigam um dos mais altos níveis de diversidade de mamíferos da Terra, e boa parte dessa diversidade se encontra nas áreas legalmente protegidas em áreas de domínio privado. As reservas legais (RLs) e áreas de proteção permanente (APPs) representam estratégias importantes para a proteção e manutenção dessa diversidade. Mudanças propostas no Código Florestal certamente trarão efeitos irreversíveis para a diversidade de mamíferos no Brasil. Os mamíferos apresentam papéis-chave nos ecossistemas, atuando como polinizadores e dispersores de sementes. A extinção local de algumas espécies pode reduzir os serviços ecológicos nas RLs e APPs. Outra consequência grave da redução de áreas de vegetação nativa caso a mudança no Código Florestal seja aprovada será o aumento no risco de transmição de doenças, trazendo sério problemas a saúde pública no Brasil. Palavras-chave: efeito de borda, várzea, matas ciliares, corredores, conectividade de paisagens, paisagens antropizadas, serviços ecossistêmicos.

show abstract

“…É a maior do planeta, devido à alta pluviosidade e a uma grande área de drenagem, constituída de inúmeros rios e igarapés (Sioli, 1984). Os igarapés (nome regional para rios de pequena ordem) são componentes importantes da floresta, pois criam uma heterogeneidade estrutural marcada (Lima & Gascon, 1999). Além disso, mantêm uma fauna diversa que é sustentada energeticamente principalmente pelo material orgânico proveniente das florestas adjacentes (Henderson & Walker, 1986;Nolte, 1988;Nessimian et al, 1998).…”

Section: Introductionunclassified

Distribuição espacial de insetos aquáticos em igarapés de pequena ordem na Amazônia Central

Fidelis¹,

Nessimian

Hamada³

2008

Acta Amaz.

View full text Add to dashboard Cite

RESUMOIgarapés de pequena ordem, nas reservas do Projeto Dinâmica Biológica de Fragmentos Florestais -INPA, a cerca de 80 km ao norte da cidade de Manaus, AM foram estudados quanto à composição das comunidades de insetos aquáticos em diferentes substratos. Em cada um dos 20 trechos amostrados, foram coletadas amostras nos quatro substratos principais: folhiço retido em áreas de correnteza, folhiço depositado no leito do igarapé, areia e raízes/vegetação nos barrancos marginais. Este estudo teve como objetivo avaliar a entomofauna aquática e relacioná-la com substratos específicos dentro do igarapé. O substrato com maior número de gêneros foi folhiço retido em áreas de correnteza (106) enquanto areia apresentou o menor número (55). As maiores similaridades ocorreram entre os substratos de folhiço depositado em áreas de remanso e barrancos marginais. As menores similaridades ocorreram entre folhiço retido em áreas de correnteza e areia. Alguns táxons coletados mostraram-se indicadores de um tipo de substrato, enquanto outros estiveram presentes em todos os substratos amostrados. Alguns táxons indicadores de folhas em correnteza foram encontrados em folhiço depositado em áreas de remanso em outros estudos na região Sudeste do país. Isso indica que a velocidade da correnteza pode estar determinando a fauna que ocupa esse biótopo. Igarapés maiores, com maiores valores de vazão e ordem, apresentaram comunidades mais distintas nos diferentes substratos amostrados que os igarapés menores.PALAVRAS-CHAVE: Amazônia, Igarapés, Insetos aquáticos, Distribuição espacial, Substratos. Spatial distribution of aquatic insects communites in small streams in Central Amazonia ABSTRACTSmall streams, at the Biological Dynamics of Fragmented Forest Project -INPA ca. 80 Km north from the city of Manaus (Amazonas, Braszil) , were studied concerning the composition of the aquatic insects communities in different substrates. In each one of the 20 stretches, four samples of the principal biotopes were collected: leaf litter in riffle areas, leaf litter deposited on the botton of the stream, sand and roots/vegetation on marginal banks.The aim of this study were to evaluate the aquatic insect fauna and relate it with specific substrates inside the igarapé. Leaf litter in riffle presented high richness number (106) while sand showed the lowest value (55). Higher similarity values occurred between leaf litter deposited on the botton and marginal roots/vegetation. Lower values occurred between leaf litter in riffle and sand substrates. Some collected taxa were considered indicators of one type of substrate, but there were some taxa that showed no preference. The indicator taxa occurred in riffle litter were found in deposited leaf litter in Southeast streams of Brazil. This indicates the current velocity may be responsible for the community established. The size of the stream is related to the order and flow regime. In this study bigger streams (presenting higher values of flow and order) showed more distinct communities in each substrate than th...

show abstract

The conservation value of linear forest remnants in central Amazonia

Cited by 111 publications

References 34 publications

Structure and composition of altered riparian forests in an agricultural Amazonian landscape

Structure and composition of altered riparian forests in an agricultural Amazonian landscape

Mudanças no Código Florestal e seu impacto na ecologia e diversidade dos mamíferos no Brasil

Distribuição espacial de insetos aquáticos em igarapés de pequena ordem na Amazônia Central

Contact Info

Product

Resources

About