The Need for Large-Scale, Integrated Studies of Biodiversity - the Experience of the Program for Biodiversity Research in Brazilian Amazonia

Costa, Flávia R. C.; Magnusson, William E.

doi:10.4322/natcon.00801001

Cited by 84 publications

(72 citation statements)

References 51 publications

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“…Especially in the Amazon, financial costs limit the extent of biodiversity studies (Costa and Magnusson, 2010). The cost (time and money) of environmental monitoring is a crucial factor for the viability of biodiversity studies (Margules & Pressey, 2000), and any reliable alternative should be used to increase the area covered or the duration of the time series.…”

Section: Discussionmentioning

confidence: 99%

“…Tropical Amazonian rainforests contain mosaic textures, which are correlated with forest architecture and linked to the altitudinal gradient (Guillaumet, 1987;Costa & Magnusson, 2010). These combinations of environmental variables account for the variation associated with ant's assemblage structure across tropical landscapes (Vasconcelos et al, 2003;Oliveira et al, 2009).…”

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A comparison between time of exposure, number of pitfall traps and the sampling cost to capture ground-dwelling poneromorph ants (Hymenoptera: Formicidae)

2018

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Using effective survey protocols to address the effects of environmental change are key to saving time, resources and costs. Although exhaustive sampling in any location has been shown as impractical, biodiversity sampling projects must capture sufficient information to show how species assemblages change with the environmental variables. This study investigated time of exposure in the field and the number of pitfall traps that efficiently sampled poneromorph ants in 30 250 m long plots across an area of 25 km2 of tropical rain forest in Brazil. The treatments used for the surveys included two days and 300 traps, 14 days and 300 traps, 14 days and 750 traps, and were considered the minimum, intermediate and maximum sampling efforts, respectively. We characterized each assemblage of ants in relation to a gradient of soil texture, terrain slope and leaf and branch litter volume, and then tested whether the ecological relationships observed with the maximum effort were comparable to data on intermediate and minimum sampling efforts. We also estimated the cost-effectiveness of using the protocols in survey programs. The assemblage of species sampled during 14 days was similar to the assemblage captured during two days, indicating that the number of days influenced the assemblage similarity more than the number of sampling traps. All ecological patterns detected with the maximum effort were also captured with lesser sampling efforts. Overall, both the intermediate and minimum sampling efforts represented savings around 26˗40% of total project costs and 43˗45% of time to process the samples. We recommend that two days of trapping time combined with 300 pitfall traps is a highly effective shortcut for monitoring assessment, which can be applied to large-scale biodiversity surveys in tropical forests.

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Section: Discussionmentioning

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A comparison between time of exposure, number of pitfall traps and the sampling cost to capture ground-dwelling poneromorph ants (Hymenoptera: Formicidae)

2018

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“…For each east -west trail, there are five uniformly distributed plots located at 1-km intervals along the trails. These plots are 250 m in length and follow the altitudinal contour lines [for more details on this sampling design see Magnusson et al (2008) and Costa and Magnusson (2010)]. Of the 30 evenly distributed plots in the grid, 19 are seasonally flooded, and are considered aquatic plots in this study (Figure 1).…”

Section: Sampling Pointsmentioning

confidence: 99%

The influence of rain in limnological characteristics of Viruá wetlands, Brazilian Amazon

2014

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Aim: Floodplains occupy a vast area of the Amazon basin but little is known of how their physical and limnological characteristics respond to local and regional ecological processes. In the Negro River basin and its main tributary, the Branco River, there are large areas that are seasonally flooded by water from local rainfall and that are not directly connected to major rivers. One such area is the floodplain of Viruá National Park, in Roraima state, northern Brazil. Methods: The physical and chemical limnological characteristics of 19 plots in this area were monitored over three years (2008)(2009)(2010), with samples collected each year at the beginning and end of the rainy season (May to August). Results: The water bodies studied had low mean values for electrical conductivity (22.0 ± 14.0 µS*cm -1 ) and pH (4.8 ± 0.7), relatively high temperatures (26.6 ± 2.7 °C), and moderate values for dissolved oxygen saturation (43.0 ± 21.5%) and water transparency (87.9 ± 38.7 cm). There was no significant difference in the limnological characteristics of the aquatic plots between the beginning and end of the rainy seasons in 2008 and 2010, but there were significant differences in 2009 due to an atypical rainfall pattern with two short dry spells during the rainy season. Multivariate analysis showed that the highest temporal variations in the limnological characteristics of the aquatic plots resulted from changes in water transparency, and these changes were related to soil type, elevation of the plot, and the particular micro-basins to which they were connected. Conclusions: This dynamic is different from that of most floodplains in the Amazon region, where the limnological pattern is well-defined seasonally and strongly dependent on the direct connectivity to large river systems. Floodplains not connected to large rivers should receive special attention in relation to the expected impacts of global climate change because of their high dependence on local rainfall.Keywords: water transparency, seasonal variation, wetland, Branco River basin, Viruá National Park, temporary ponds. Resumo: Objetivos:As planícies alagáveis da Amazônia ocupam uma vasta área e compreender os padrões das características limnológicas dessas planícies é de grande importância para os processos ecológicos locais e regionais. Na bacia do rio Negro e de seu principal afluente, o rio Branco, há grandes áreas sazonalmente alagadas que são abastecidas principalmente por chuvas locais e não são conectadas diretamente com grandes rios. Uma dessas áreas é a planície alagável do Parque Nacional do Viruá, em Roraima, no extremo norte do Brasil. Métodos: Foram monitoradas as características físicas e limnológicas de 19 parcelas durante três anos (2008 -2010), com coletas realizadas no início e no fim do período de chuvas (maio -agosto). Resultados: Os corpos d'água estudados apresentaram baixos valores médios de condutividade elétrica (22.0 ± 14,0 µS*cm -1 ) e pH (4.8 ± 0.7). A temperatura foi relativamente alta (26.6 ± 2.7 °C) e o oxigênio dis...

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“…Localities I, II and IV consist of 12 1-ha permanent plots, and locality III includes 8 plots. There is a minimum distance of 1 km between all permanent plots (40 x 250m) in each locality, and each plot follows a topographical contour to minimize internal soil variation (Magnusson et al 2005;Costa and Magnusson 2010). Localities I, II and III are approximately 20 km apart, and locality IV is approximately 360 km away from the localities I, II, and III.…”

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“…Individuals of Triuridaceae were collected in four permanent sampling localities: three in Claudia municipality, where the climate is dry (locality I: 11°34'54.0" S, 55°17'15.6" W, locality II: 11°35'20.3" S, 55°17'34.7" W in Continental Farm; locality III: 11°39'09.4" S, 55°04'54.6" W in Iracema Farm), and one in Cotrigaçu municipality, where the climate is wet (locality IV: 09°49'11,1" S, 58°15'31,4" W in São Nicolau Farm). This study was carried out in southern Amazonia as part of the Research Program in Biodiversity (PPBio), using the RAPELD methodology (see Magnusson et al 2005;Costa and Magnusson 2010). Localities I, II and IV consist of 12 1-ha permanent plots, and locality III includes 8 plots.…”

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confidence: 99%

New records of Sciaphila Blume, Sciaphila purpurea Benth; Triuris Miers and Triuris hyalina Miers in the southern Amazon forest, Mato Grosso, Brazil

Vilela-Santos¹,

Barbosa²,

Santos³

et al. 2013

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The Need for Large-Scale, Integrated Studies of Biodiversity - the Experience of the Program for Biodiversity Research in Brazilian Amazonia

Cited by 84 publications

References 51 publications

A comparison between time of exposure, number of pitfall traps and the sampling cost to capture ground-dwelling poneromorph ants (Hymenoptera: Formicidae)

A comparison between time of exposure, number of pitfall traps and the sampling cost to capture ground-dwelling poneromorph ants (Hymenoptera: Formicidae)

The influence of rain in limnological characteristics of Viruá wetlands, Brazilian Amazon

New records of Sciaphila Blume, Sciaphila purpurea Benth; Triuris Miers and Triuris hyalina Miers in the southern Amazon forest, Mato Grosso, Brazil

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