Estudos climatológicos da Reserva Florestal Ducke, Manaus, AM. III. Evapotranspiração ()

Ribeiro, Maria de Nazaré Góes; Nova, Nílson Augusto Villa

doi:10.1590/1809-43921979092305

Cited by 28 publications

(12 citation statements)

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“…dry season is from June to October. Average rainfall is 2000 mm/year, and mean annual temperature is 26 • C. Seasonal temperature variation is small (Ribeiro & Nova 1979).…”

Section: Study Areamentioning

confidence: 99%

Effects of Reduced‐Impact Logging on Fish Assemblages in Central Amazonia

Dias

Magnusson

Zuanon

2010

Conservation Biology

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In Amazonia reduced-impact logging, which is meant to reduce environmental disturbance by controlling stem-fall directions and minimizing construction of access roads, has been applied to large areas containing thousands of streams. We investigated the effects of reduced-impact logging on environmental variables and the composition of fish in forest streams in a commercial logging concession in central Amazonia, Amazonas State, Brazil. To evaluate short-term effects, we sampled 11 streams before and after logging in one harvest area. We evaluated medium-term effects by comparing streams in 11 harvest areas logged 1-8 years before the study with control streams in adjacent areas. Each sampling unit was a 50-m stream section. The tetras Pyrrhulina brevis and Hemigrammus cf. pretoensis had higher abundances in plots logged > or =3 years before compared with plots logged <3 years before. The South American darter (Microcharacidium eleotrioides) was less abundant in logged plots than in control plots. In the short term, the overall fish composition did not differ two months before and immediately after reduced-impact logging. Temperature and pH varied before and after logging, but those differences were compatible with normal seasonal variation. In the medium term, temperature and cover of logs were lower in logged plots. Differences in ordination scores on the basis of relative fish abundance between streams in control and logged areas changed with time since logging, mainly because some common species increased in abundance after logging. There was no evidence of species loss from the logging concession, but differences in log cover and ordination scores derived from relative abundance of fish species persisted even after 8 years. For Amazonian streams, reduced-impact logging appears to be a viable alternative to clear-cut practices, which severely affect aquatic communities. Nevertheless, detailed studies are necessary to evaluated subtle long-term effects.

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“…dry season is from June to October. Average rainfall is 2000 mm/year, and mean annual temperature is 26 • C. Seasonal temperature variation is small (Ribeiro & Nova 1979).…”

Section: Study Areamentioning

confidence: 99%

Effects of Reduced‐Impact Logging on Fish Assemblages in Central Amazonia

Dias

Magnusson

Zuanon

2010

Conservation Biology

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“…The rainy season extends from December to May, and the dry season from June to November. According to Thornthwaite's water balance, a water deficit occurs in the soil between the months of August and October (Ribeiro & Villa Nova, 1979). The relief is composed of rolling hills, with a variation of altitude of 100 m between the plateaus and the lowlands.…”

Section: Study Sitementioning

confidence: 99%

Genetic diversity in rosewood saplings (Aniba rosaeodora ducke, Lauraceae): an ecological approach

2008

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This article takes an ecological approach to the genetic diversity of Rosewood (Aniba rosaeodora Ducke) in a central Amazonian terra firme forest north of Manaus. Planted Rosewood setting, under partial shaded canopy, were assessed in terms of fruiting production, frugivory, and seed dispersal. Using RAPD molecular analysis procedures, the influence of the spatial distribution of adult trees on the genetic diversity (polymorphism) of saplings was assessed with genetic samples from 34 reproductive trees and 60 saplings. The density and distribution patterns the reproductive trees did not modify the sapling's diversity (1.86%, AMOVA). Two types of adult tree dispersion were identified; i) clumped and ii) more widely dispersed. Polymorphism (77.5%) and gene flow were high between these. Although more sapling genetic variability in areas with a higher density of mature plants was not as high as expected, density did not affect the genetic diversity of samplings, indicating a high incidence of gene flow amongst trees. In planted Rosewood population (surrounded by low disturbed forest), fruiting trees experienced a high level of removal of seeds by toucans (Rhamphastidae), about of 50%. The high gene flow found among native trees suggested that toucans, promoting seed rain at short and long distances from maternal trees, actively contribute to the maintenance of genetic diversity within wild rosewood populations.Key words: Amazonian tree, RAPD, seed dispersal, gene flow, genetic diversity.Diversidade genética em plantas jovens de Pau-rosa (Aniba Rosaeodora Ducke, Lauraceae): uma abordagem ecológica resumo Dados genéticos e ecológicos foram obtidos do Pau-rosa (Aniba rosaeodora Ducke) em uma floresta de terra firme localizada ao norte de Manaus. Em um sistema de plantio composto de plantas sob sombreamento parcial, foram analisados dados de frugivoria, produção de frutos e dispersão. Numa população natural, com 34 plantas adultas e 60 jovens, foi analisada a influência da distribuição espacial das plantas adultas na diversidade genética (polimorfismo) das jovens utilizando o marcador molecular RAPD. O modelo de distribuição e densidade das plantas adultas não alterou a diversidade genética da progênie (1,86%; AMOVA). Tanto o polimorfismo (77,5%) quanto o fluxo gênico entre os dois subgrupos de plantas (dispersas e agrupadas) foram altos. Embora se esperasse que a diversidade genética fosse maior na progênie oriunda do grupo com maior densidade de plantas, isso não foi observado, indicando um alto fluxo gênico entre as adultas. No plantio, as árvores com frutos tiveram uma alta taxa de remoção de sementes por tucanos (Rhamphastidae), em torno de 50%. Estes resultados indicam que estes pássaros também têm um papel fundamental na dispersão de sementes em população naturais. De fato o alto fluxo gênico encontrado entre as plantas adultas em populações naturais sugere que estes animais promovem chuva de sementes a curtas e longas distâncias entre árvores reprodutivas, o que contribui com a manutenção da diversidade ...

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“…The year is divided into a rainy season (December-May: average precipitation 1550 mm) and a "dry season" (June-November: average precipitation 550mm), but each month has significant precipitation; see Ribeiro & Adis, 1984;Ribeiro & Villa NOVA, 1979). Nine years of precipitation records are available for Reserva Ducke ( Fig.…”

Section: Climatementioning

confidence: 99%

“…Nine years of precipitation records are available for Reserva Ducke ( Fig. 13; data from Ribeiro & Villa Nova, 1979).…”

Section: Climatementioning

confidence: 99%

Spatial and temporal distribution of a tiger beetle guild (Coleoptera: Carabidae: Cicindelinae) along a 105m long transect in the reserva florestal A. Ducke near Manaus (Central Amazonia)

et al. 1998

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-The spatial and temporal distribution of a guild of eight diurnal tiger beetle species was studied on a 105 m long transect near the field station of the Reserva Florestal A. Ducke near Manaus (AM), Brazil. The transect followed a path that included both shaded and an open areas. Five of the species, restricted to primary forest, occurrred only in shaded areas of the transect, and three species occurred in open areas. Of all eight species only two of the open habitat species showed no clear seasonality in adult activity. In six species the activity of adults was limited to the rainy season. The most pronounced annual rhythm was found in Pentacomia ventralis, an open habitat species. Activity of adults was limited to October/November. First instar larvae appeared shortly thereafter. Larval development mainly took place from January to May. The third instar larva entered a dormancy which lasted up to 10 months, and which

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Estudos climatológicos da Reserva Florestal Ducke, Manaus, AM. III. Evapotranspiração ()

Cited by 28 publications

References 0 publications

Effects of Reduced‐Impact Logging on Fish Assemblages in Central Amazonia

Effects of Reduced‐Impact Logging on Fish Assemblages in Central Amazonia

Genetic diversity in rosewood saplings (Aniba rosaeodora ducke, Lauraceae): an ecological approach

Spatial and temporal distribution of a tiger beetle guild (Coleoptera: Carabidae: Cicindelinae) along a 105m long transect in the reserva florestal A. Ducke near Manaus (Central Amazonia)

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