Birds trapped in mist nets killed by opportunistic predators in a forest in Southwestern Amazonia

The use of mist nets is a highly used method among researchers due to their efficiency in capture birds and bats. However, trapped animals are vulnerable to predator action. During three ornithological studies carried out in a forest fragment from southwest Amazonia, we recorded 15 predation events, with predation rate of 1.5%. Among predators, 26.7% (n = 4) of the cases were related to primates, 13.3% (n = 2) related to army ants, 13.3% (n = 2) related to an unidentified hawk species and in 46.7% (n = 7) of the cases the predators did not identified. Preventing predator access to mist nets and reducing network monitoring time are some of the measures that can prevent these events.

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Breeding records of Leptotila rufaxilla (Aves: Columbidae) in southwestern Brazilian Amazon with notes on nesting in some regions of occurrence

Revista Peruana de Biología ◽

10.15381/rpb.v28i3.18793 ◽

2021 ◽

Vol 28 (3) ◽

pp. e18793

Author(s):

Jônatas Lima ◽

Railene Almeida ◽

Edson Guilherme

Keyword(s):

Growth Rate ◽

Brazilian Amazon ◽

Nesting Success ◽

Daily Survival Rate ◽

Forest Fragment ◽

Lowland Forest ◽

Constant Growth Rate ◽

Nestling Period ◽

Constant Growth ◽

Southwestern Amazonia

We present new aspects of breeding biology of Gray-fronted Dove Leptotila rufaxilla, from five nests found between 2012 and 2014 in a lowland forest fragment in southwestern Brazil. The nests simple/platform shape were built at a mean height of 1.90 m above ground. The clutch size was two eggs white and elliptic, incubated for 15 days (based on three nests). We recorded predation in two nests still in incubation phase. Minimum hatch weight of nestlings was 10 g and young fledged with a mean mass of 56 g. The constant growth rate (K) of nestlings was 0.40 with a growth asymptote of 60.7 g. Daily survival rate, Mayfield and apparent nesting success in the incubation period was 90, 20 and 56%, respectively, while in the nestling period were all 100%. Our data and the contribution of citizen science showed that L. rufaxilla breeds over the year, mainly in the rainy season, both in southwestern Amazonia and in other regions of occurrence.

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New records and geographic distribution of Grey Woolly Monkeys, Lagothrix cana (É. Geoffroy, 1812) (Primates, Atelidae), in southern Brazilian Amazonia

Check List ◽

10.15560/12.6.2007 ◽

2016 ◽

Vol 12 (6) ◽

pp. 2007

Author(s):

André V. Nunes ◽

Vinicius S. Orsini

Keyword(s):

Endangered Species ◽

Geographic Distribution ◽

New Record ◽

New Records ◽

Forest Fragment ◽

Woolly Monkey ◽

Mato Grosso ◽

Woolly Monkeys ◽

Arc Of Deforestation ◽

Southwestern Amazonia

We report a range extension of the Grey Woolly Monkey, Lagothrix cana, from southwestern Amazonia, Mato Grosso, Brazil. Lagothrix cana was seen in a forest fragment near the “arc of deforestation”. This new record shows the need for conservation of forests in the region to protect this endangered species.

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Influence of habitat structure on Pristimantis species (Anura: Craugastoridae) in a bamboo-dominated forest fragment in southwestern Amazonia

Phyllomedusa Journal of Herpetology ◽

10.11606/issn.2316-9079.v14i1p19-31 ◽

2015 ◽

Vol 14 (1) ◽

pp. 19

Author(s):

Jhon Jairo López-Rojas ◽

Moisés Barbosa Souza ◽

Elder Ferreira Morato

Keyword(s):

Species Composition ◽

Habitat Structure ◽

Neutral Theory ◽

Canopy Cover ◽

Spatial Distance ◽

Niche Theory ◽

Forest Fragment ◽

Biodiversity Research ◽

Remnant Forest ◽

Southwestern Amazonia

Structural and determinate factors for the composition of assemblages of species are diverse. Two theories attempt to explain the pattern of species composition in assemblies using different approaches—i.e., Niche Theory and Neutral Theory. Anurans have complex responses to habitat structure. Species of Pristimantis are good indicators for conservation because they are organisms with direct development. The effect of habitat structure on species of Pristimantis in a bamboo-dominated remnant forest located in southwestern Amazonia is analyzed herein. Active visual and auditory searches in 10 plots of the Biodiversity Research Program (PPBio) were conducted between November 2012 and May 2013. Four hundred and sixty individuals of five species were recorded: Pristimantis altamazonicus, P. diadematus, P. fenestratus, P. reichlei, and P. skydmainus. Neither spatial distance nor the structure of the habitat of the plots affected the composition of Pristimantis. The first axis of PCA explained 45.6% variation of the characterization habitat structure, correlated significantly with the number of Pristimantis, species increasing with trees between 10 ≤ dbh < 30 cm and decreased with density of bamboo. The increase in litter depth and canopy cover influenced in the occurrence of P. reichlei, the occurrence of P. skydmainus decreased with increased density of bamboo and trees dbh ≥ 30 cm and the occurrence of P. diadematus decreased relative to increased canopy cover. Pristimantis diadematus and P. skydmainus were the most restricted species in terms of habitat and were especially susceptible to bamboo density.

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Predation of army ants by Toppin’s titi monkey, Plecturocebus toppini Thomas 1914 (Primates: Pitheciidae), in an urban forest fragment in eastern Acre, Brazil

Primates ◽

10.1007/s10329-018-0677-4 ◽

2018 ◽

Vol 59 (5) ◽

pp. 469-474 ◽

Cited By ~ 1

Author(s):

Francisco Salatiel Clemente de Souza ◽

Armando Muniz Calouro

Keyword(s):

Urban Forest ◽

Forest Fragment ◽

Army Ants ◽

Titi Monkey

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Tree mortality, recruitment and growth in a bamboo dominated forest fragment in southwestern Amazonia, Brazil

Biota Neotropica ◽

10.1590/s1676-06032013000200002 ◽

2013 ◽

Vol 13 (2) ◽

pp. 29-34 ◽

Cited By ~ 13

Author(s):

Herison Medeiros ◽

Wendeson Castro ◽

Cleber Ibraim Salimon ◽

Izaias Brasil da Silva ◽

Marcos Silveira

Keyword(s):

Growth Rate ◽

Edge Effect ◽

Tree Mortality ◽

Biodiversity Loss ◽

Average Diameter ◽

Recruitment Rate ◽

Diameter Growth ◽

Time Interval ◽

Forest Fragment ◽

Southwestern Amazonia

Forest fragmentation affects the structure and dynamics of plant communities, leading to biodiversity loss in forest remnants. In this paper we show that in a bamboo (Guadua weberbaueri Pilger) dominated forest fragment in southwestern Amazonia edge effect may be confounded by bamboo effect, which also occur inside the forest. We measured growth, mortality and, recruitment rate of trees with DBH ≥ 10 cm, in a fragment of bamboo dominated open forest in southwestern Amazonia, state of Acre, Brazil, in 15 plots at the forest edge and 15 plots inside the forest fragment, 500 m away from the border. Time interval between censuses was 1.8 years. The average diameter growth rate differed significantly between edge (3.82 ± 0.10 mm a-1) and interior (2.39 ± 0.18 mm a-1); but there were no differences in annual mortality rate (edge = 3.8 ± 2.5 % a-1 CV = 65.7%; interior = 3.6 ± 2.6% a-1 CV = 72.2%) or in annual recruitment rate (edge = 7.1 ± 3.2% a-1 CV = 45%; interior = 8.9 ± 7.9% a-1 CV = 88.7%). Diameter growth rate, particularly of pioneer and fast-growing trees, is favored by the environmental conditions of the edge, where bamboo abundance is higher. However, the absence of an edge effect on mortality and recruitment could be due to the particular dynamics of bamboo patches, which could be mimicking forest edges and therefore masking possible edge effect in this fragment. We speculate that the mortality and recruitment patterns in fragmented forests of southwestern Amazonia is different from other areas in Amazonia and that bamboo is one of the key controllers of successional processes in these fragments.

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First nest records, nestling growth and morphometrics of Dendroplex picus peruvianus (Aves: Dendrocolaptidae) in southwestern Brazilian Amazon

Revista Peruana de Biología ◽

10.15381/rpb.v28i3.20476 ◽

2021 ◽

Vol 28 (3) ◽

pp. e20476

Author(s):

Jônatas Lima ◽

Edson Guilherme

Keyword(s):

Growth Rate ◽

Clutch Size ◽

Rainy Season ◽

Brazilian Amazon ◽

Forest Fragment ◽

Constant Growth Rate ◽

Nestling Growth ◽

Constant Growth ◽

Southwestern Amazonia

We reported the first data on the breeding and growth in Dendroplex picus peruvianus from a forest fragment in southwestern Amazonia. We observed and netted this species between 1999 and 2019. We found two active nests in 2012 and 2013, but we monitored only one. Clutch size was two eggs, incubated for 16 days. The constant growth rate (K) of nestlings was 0.31 with a growth asymptote of 46.3 g. We recorded a longest minimum longevity of eight years. Our records showed that D. p. peruvianus breeds mainly in the rainy season (September–March) overlapping with the molt period.

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