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1
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The use of the 210Pb method for preliminary evaluating the sedimentation rate in Amazon river mouth

100%
Althammer S., Fosshag E., Hoffmann H. M., Nery J. R. C., Bonotto D. M.
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
|
2010
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tom 42
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nr 1
149-157
This investigation reports the preliminary results for determining the sedimentation rate at the Amazonas River mouth, Brazil, by the 210Pb method. The CIC (constant initial concentration) of unsupported/excess 210Pb model was successfully applied to one sediments core. The measurements were made in a sediments core comprising ten samples 10 cm – thick each. The year of the sampling (2006) was used as reference for the establishment of the rate of sedimentation from the beginning of the top of the testimony. However, the atmospheric conditions and climate in Amapá State, Brazil, claimed for optimization of the results. Because the Channel North is opened into the Atlantic Ocean, it exhibits a huge water volume, causing a permanent motion of sediments and water. So, heavy waves are formed at the water surface, stirring the upper sand strata. Only at a depth of 40–50 cm the profile tends to be more homogeneous, where it is mostly composed by fine sand and very fine sand. Thus, it is reasonable utilize the CIC model from 210Pb data, which allows estimate a sedimentation rate corresponding to 0.61 g/cm²yr and a mean linear rate of 0.8 cm/yr. The 238U and 210Pb activities in the sediments allowed the reconstruction of the sedimentation processes over a period of about 130 years.
2
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Can payments for ecosystem services contribute to sustainable development in the Brazilian Amazon?

88%
Seehusen S. E.
Folia Forestalia Polonica. Series A . Forestry
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2009
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tom 51
|
nr 1
The Brazilian Amazon supplies the world with several forests ecosystem services, many of which are essential to sustain human life on earth. Nevertheless, the Amazon is threatened by deforestation and degradation implying in reductions on the provision of these. According to economic theory, as ecosystem services are positive externalities and public goods, agents do not take into consideration the costs and benefits of their consumption and production of ecosystem services into their economic decisions. To address this problem payment for ecosystem services – PES – emerged, aiming to provide a source of income to the poor people living in forest areas, stimulating them not to deforest, and making agents who are indebted with the nature pay for their overconsumption of ecosystem services. There is still controversy about possible impacts of the instrument. This article accesses the potentials of PES to contribute to sustainable development in the Brazilian Amazon using the three goals related to sustainable development proposed by the ecological economics theory: efficient allocation, fair distribution, and sustainable scale. The study shows that PES as a pure market approach is unlikely to solve neither the scale nor the distribution problems. Therefore, for PES to achieve sustainable development, markets for ecosystem services should first be constrained by a maximum sustainable scale. Then, measures should ensure fair distribution in second place. Only after these questions have been tackled, it is desirable that agents interact in the ecosystem services markets to lead to an efficient allocation of resources.
3

Seasonal pattern in parasite infracommunities of Hoplerythrinus unitaeniatus and Hoplias malabaricus (Actinopterygii: Erythrinidae) from the Brazilian Amazon

75%
Goncalves R. A., Oliveira M. S. B., Neves L. R., Tavares-Dias M.
Acta Parasitologica
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2016
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tom 61
|
nr 1
4

Ecology and seasonal variation of parasites in wild Aequidens tetramerus, a Cichlidae from the Amazon

63%
Tavares-Dias M., Oliveira M. S. B., Goncalves R. A., Silva L. M. A.
Acta Parasitologica
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2014
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tom 59
|
nr 1
This study is the first investigation on seasonal dynamics of parasites component community of the Aequidens tetramerus from an Amazon River tributary, in Northern Brazil. A total of 239,2407 parasites were recovered from 92 hosts examined from February to October 2011. Such parasites included Ichthyophthirius multifiliis, Tripartiella tetramerii and Trichodina nobilis (Protozoa), Dolops longicauda (Argulidae), Gussevia alioides, Gussevia disparoides (Monogenoidea), Digenea metacercarie, Pseudoproleptus larvae, Anisakidae larvae (Nematoda), Proteocephalidea plerocercoid (Eucestoda) and Gorytocephalus spectabilis (Acanthocephala). Ciliates were the most dominant and abundant taxon, while cestodes were the least prevalent. The parasites showed seasonal variation in their infection dynamics associated with environmental changes during the Amazonian drainage season, except the infection with I. multifiliis. The parasites community in A. tetramerus was also characterized by higher diversity, species richness and uniformity during the drainage season when compared to Amazon flood season. With the exception of T. tetramerii, these parasite species are new records for A. tetramerus.
5

Ultrastructural description of a new myxosporean parasite Kudoa aequidens sp. n. [Myxozoa, Myxosporea], found in the sub-opercular musculature of Aequidens plagiozonatus [Teleostei] from the Amazon River

63%
Casal G., Matos E., Matos P., Azevedo C.
Acta Protozoologica
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2008
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tom 47
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nr 2
135-141
6

Interannual and seasonal variation in protozoan and metazoan parasite communities of Hemibrycon surinamensis, a characid fish inhabiting the Brazilian Amazon

63%
de Melo Hoshino E., Tavares-Dias M.
Acta Parasitologica
|
2019
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tom 64
|
nr 3
7

Ultrastructural description of Microsporidium brevirostris sp. n., parasite of the teleostean Brachyhypopomus brevirostris [Hypopomidae] from the Amazon River

63%
Matos E., Azevedo C.
Acta Protozoologica
|
2004
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tom 43
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nr 3
8

Description of Triangulamyxa psittaca sp. nov. (Myxozoa: Myxosporea), a new parasite in the urinary bladder of Colomesus psittacus (Teleostei) from the Amazon River, with emphasis on the ultrastructure of plasmodial stages

51%
Rocha S., Casal G., Matos P., Matos E., Dkhil M., Azevedo C.
Acta Protozoologica
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2011
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tom 50
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nr 4
9

Morphological and molecular characteristics of Kudoa viseuensis n. sp. (Myxosporea: Multivalvulida), found in the muscle of Batrachoides surinamensis (Teleostei: Batrachoididae) in the Brazilian Amazon region

51%
Monteiro E. P., Da Silva D. T., Hamoy I., Sanches O., Matos E.
Acta Protozoologica
|
2019
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tom 58
|
nr 1
10

The Amazon floodplain demonstration site: Sustainable timber production and management of Central Amazonian white-water floodplains

51%
Wittmann F., Schongart J., Queiroz H. L., Wittmann A. O., Conserva A. S., Piedade M. T. F., Kesselmeier J., Junk W. J.
International Journal of Ecohydrology and Hydrobiology
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2009
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tom 09
|
nr 1
Within the frame of the UNESCO Ecohydrology Program, the present Demonstration Project aims at the enrichment of degraded várzea forest patches with economically important timber species in the Mamirauá Sustainable Development Reserve (MSDR), western Brazilian Amazon. Enrichment plantations will reduce exploitation pressure in the natural environment and will contribute to the conservation of várzea forests and its ecological integrity by introducing alternative sources of income for the inhabitants. We present preliminary results from an interdisciplinary research, including data about the use and the net present values of timber trees in western Brazilian várzea; growth models and management criteria of the most exploited timber species; and germination experiments, which demonstrate that várzea timber species are easy to germinate, without requiring complicate treatments and expensive materials. These data allow for the initialization of timber species reproduction at larger scales, and provide the scientific basis to enrich degraded várzea forests with economically important timber species.
11

Ultrastructure and phylogeny of Pleistophora beebei sp. nov. (Microsporidia) infecting the Amazonian teleostean Brachyhypopomus beebei (fam. Hypopomidae)

51%
Casal G., Matos E., Rocha S., Sindeaux-Neto J., Al-Quraishy S., Azevedo C.
Acta Protozoologica
|
2016
|
tom 55
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nr 4
12

Redescription of the tapeworm Monticellia amazonica de Chambrier et Vaucher, 1997 [Cestoda, Proteocephalidea], a parasite of Calophysus macropterus [Siluriformes, Pimelodidae] from the Amazon River

51%
Scholz T., de Chambrier A., Kuchta R.
Acta Parasitologica
|
2008
|
tom 53
|
nr 1
The proteocephalidean cestode Monticellia amazonica de Chambrier et Vaucher, 1997 (nom. nov. for Nomimoscolex piracatinga Woodland, 1935), a parasite of Calophysus macmpterus (Lichtenstein, 1819) (Siluriformes, Pimelodidae), is redescribed on the basis of type specimens and recently collected material from the Amazon River near the type localities in Brazil, and from Peru. This insufficiently known taxon is most similar to M. ventrei de Chambrier et Vaucher, 1999 from Pinirampus spp. from Paraguay and Brazil in having almost indistinguishable internal longitudinal musculature formed by a very few (5–15) tiny bundles of muscle fibres. Monticellia amazonica differs from M. ventrei in the shape of proglottids (much more elongate in the former taxon), absence of medially situated vitelline follicles at the ovarian level (present in M. ventrei) and the number of testes (175–233 in M amazonica vs. 222–325 in M ventrei).
13

Some optical properties of surface waters in the north-western Tropical Atlantic

51%
Krezel A., Kamieniecki M.
Oceanologia
|
1992
|
tom 32
14

New data on the morphology of Nilonema senticosum [Nematoda, Philometridae], a parasite of Arapaima gigas [Pisces], with notes on another philometrid, Alinema amazonicum, in Peru

51%
Moravec F., Scholz T., Kuchta R., Dykova I., Posel P.
Acta Parasitologica
|
2006
|
tom 51
|
nr 4
Female specimens of a little-known philometrid nematode, Nilonema senticosum (Baylis, 1927), were collected from the swimbladder of the arapaima, Arapaima gigas, from the Amazon River basin (Iquitos, Loreto District) in Peru. Scanning electron microscopical (SEM) examination, used for the first time in this species, made it possible to reveal some taxonomically important, previously unreported features of N. senticosum, such as the presence of minute cephalic papillae (10 papillae in 2 circles) and amphids surrounding the small oral aperture, and to confirm the absence of an anal opening in this species. Males and females of another philometrid, Alinema amazonicum (Travassos, 1960), were recovered from the body cavity of the pimelodid catfishes Calophysus macropterus and Brachyplatystoma juruense (a new host record) from the Amazon River basin (fish market in Iquitos, Loreto District) in Peru. SEM examination, not previously used in the male of A. amazonicum, enabled to study in detail the male cephalic and caudal structures.
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