scholarly journals Diversity and Abundance of Fish Larvae Drifting in the Madeira River, Amazon Basin: Sampling Methods Comparison

10.5772/57404 ◽  
2014 ◽  
Author(s):  
Ronaldo Barthem ◽  
Marcio Candido da Costa ◽  
Fernanda Cassemiro ◽  
Rosseval Galdino Leite ◽  
Nelson Jorge da Silva
Keyword(s):  
Amazon Basin ◽  
Sampling Methods ◽  
Fish Larvae ◽  
Methods Comparison ◽  
Madeira River

scholarly journals Preliminary Study on Fish Larvae at Selected Coastal Waters of Sarawak

1970 ◽  
Vol 4 (2) ◽  
pp. 1-8
Author(s):  
Norhakimi Muhamad ◽  
Siti Akmar Khadijah Ab Rahim
Keyword(s):  
Coastal Waters ◽  
Intertidal Zone ◽  
Larval Dispersal ◽  
Sampling Methods ◽  
Fish Larvae ◽  
Mesh Size ◽  
Subtidal Zone ◽  
Preliminary Study ◽  
Study Sites

A survey were carried out from April to November 2012 at five study sites namely Teluk Pandan beach, Rambungan beach, Puteri beach, Sampadi Island and Satang Besar Island, Sarawak. This survey was carried out in order to obtain early documentation of fish larvae at selected coastal waters of Sarawak. Seine net (1 mm mesh size) which was pulled by two persons at intertidal zone; and bridle net (0.5 mm mesh size) that was towed by boat at subtidal zone (Sampadi Island only) were used to collect the samples. A total of 2,562 fish larvae which comprise 25 families were obtained from both sampling methods. A total of 16 families of fish larvae were caught by seine net from the intertidal zone. The same number of families was collected at the subtidal zone of Sampadi Island by bridle net. Ambassidae, Clupeidae, Engraulidae and Gerreidae found to be dominant families in the study sites. Clupeidae and Gerreidae shown a wide larval dispersal area because they were collected at all study sites. These findings seem to indicate that the subtidal zone of Sampadi support more species of fish larvae.

scholarly journals Triplodon chodo, a new species of pearly fresh water mussel from the Amazon Basin (Mollusca: Bivalvia: Unionoida: Hyriidae)

2008 ◽  
Vol 25 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Maria C. D. Mansur ◽  
Daniel M. Pimpão
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Shell Height ◽  
Anterior Region ◽  
Obtuse Angle ◽  
Madeira River ◽  
Amazonas State ◽  
The Guianas ◽  
A New Species ◽  
Madeira River Basin

A new species of the genus Triplodon Spix, 1827 is described based on shell samples collected on Rivers Jamari (Rondônia State) and Aripuanã (Amazonas State) from the Madeira River Basin; on the Amazon at Oriximiná and on the mouth of Tapajós River at Alter do Chão (Pará State). Triplodon chodo is a new species considered closely related to T. stevensi Lea, 1871, (described from the part of the River Essequibo which borders the Guianas). Triplodon chodo is distinguished from the latter by its smaller, lighter shell, the absence of a wing in the anterior region and by the delicate shape of the external sculpture, which is composed of minuscule nodules organized in rows that converge and crosses on the centre of the valves. The straight and vertical posterior margin forms a right or slightly obtuse angle with the shell's dorsal and ventral margins. The anterior region is short, low and slightly tapering, with the distal extremity situated on the half of the shell height. The dorsal and ventral margins are equally curved.

Effects of natural rapids and waterfalls on fish assemblage structure in the Madeira River (Amazon Basin)

2011 ◽  
Vol 20 (4) ◽  
pp. 588-597 ◽  
Author(s):  
Gislene Torrente-Vilara ◽  
Jansen Zuanon ◽  
Fabien Leprieur ◽  
Thierry Oberdorff ◽  
Pablo A. Tedesco
Keyword(s):  
Fish Assemblage ◽  
Amazon Basin ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Madeira River

scholarly journals Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Marília Hauser ◽  
Carolina R. C. Doria ◽  
Larissa R. C. Melo ◽  
Ariel R. Santos ◽  
Daiana M. Ayala ◽  
...  
Keyword(s):  
River Basin ◽  
Amazon Basin ◽  
Growth Parameters ◽  
Growth Patterns ◽  
Age And Growth ◽  
Growth Rings ◽  
Madeira River ◽  
Lower Maximum ◽  
Future Evaluation ◽  
Madeira River Basin

ABSTRACT The goliath catfish Brachyplatystoma rousseauxii has crucial economical and ecological functions in the Amazon basin. Although its life history characteristics have been studied in the Amazon, there is little information in the Madeira River basin, which holds genetically distinct populations and where dams were recently built. Using fish collected in Bolivia, Brazil and Peru, this study provides a validation of growth rings deposition and details the growth patterns of B. rousseauxii in the Madeira before the dams’ construction. Age structure and growth parameters were determined from 497 otolith readings. The species exhibits two growth rings per year and sampled fish were between 0 and 16 years old. In the Brazilian portion of the basin, mainly young individuals below 5 years old were found, whereas older fish (> 5 years) were caught only in the Bolivian and Peruvian stretches, indicating that after migrating upstream to reproduce, adults remain in the headwaters of the Madeira River. Comparing with previous publications, B. rousseauxii had a slower growth and 20 cm lower maximum standard length in the Madeira River than in the Amazon River. This study provides a baseline for future evaluation of changes in population dynamics of the species following dams closure.

Temporal fish community responses to two cascade run-of-river dams in the Madeira River, Amazon basin

Ecohydrology ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. e1889 ◽  
Author(s):  
Ariana Cella-Ribeiro ◽  
Carolina Rodrigues da Costa Doria ◽  
Jynessa Dutka-Gianelli ◽  
Hellison Alves ◽  
Gislene Torrente-Vilara
Keyword(s):  
Fish Community ◽  
Amazon Basin ◽  
Community Responses ◽  
Madeira River ◽  
Run Of River

scholarly journals Dataset of long-term monitoring of ground-dwelling ants (Hymenoptera: Formicidae) in the influence areas of a hydroelectric power plant on the Madeira River in the Amazon Basin

2018 ◽  
Vol 6 ◽  
pp. e24375 ◽  
Author(s):  
Itanna Fernandes ◽  
Jorge de Souza
Keyword(s):  
Power Plant ◽  
Amazon Basin ◽  
Hydroelectric Power Plant ◽  
Biodiversity Loss ◽  
Hydroelectric Power ◽  
Natural Ecosystems ◽  
Influence Area ◽  
Before And After ◽  
Madeira River ◽  
The Impact

Biodiversity loss is accelerating rapidly in response to increasing human influence on the Earth’s natural ecosystems. One way to overcome this problem is by focusing on places of human interest and monitoring the changes and impacts on the biodiversity. This study was conducted at six sites within the influence area of the Santo Antônio Hydroelectric Power Plant in the margins of the Madeira River in Rondônia State. The sites cover a latitudinal gradient of approximately 100 km in the Brazilian Amazon Basin. The sampling design included six sampling modules with six plots (transects) each, totaling 30 sampling plots. The transects were distributed with 0 km, 0.5 km, 1 km, 2 km, 3 km and 4 km, measured perpendicularly from the river margin towards the interior of the forest. For sampling the ground-dwelling ants, the study used the ALL (ants of the leaf litter) protocol, which is standardized globally in the inventories of ant fauna. For the purpose of impact indicators, the first two campaigns (September 2011 to November 2011) were carried out in the pre-filling period, while campaigns 3 to 10 (February 2012 to November 2014) were carried out during and after the filling of the hydroelectric reservoir. A total of 253 events with a total of 9,165 occurrences were accounted during the monitoring. The ants were distributed in 10 subfamilies, 68 genera and 324 species/morphospecies. The impact on ant biodiversity during the periods before and after filling was measured by ecological indicators and by the presence and absence of some species/morphospecies. This is the first study, as far as we know, including taxonomic and ecological treatment to monitor the impact of a hydroelectric power plant on ant fauna. Until recently, most studies conducted on hydroelectric plants, located in the Amazon Basin, were carried out after the implementation of dams in order to assess their impacts on the environment and biodiversity (Benchimol and Peres 2015, Latrubesse et al. 2017, Sá-Oliveira et al. 2015). Recent studies on dam impacts have begun to be conducted prior to dam implementation (e.g. Bobrowiec and Tavares 2017, Fraga et al. 2014, Moser et al. 2014), thus providing a better overview of the impact and a better assessment of its magnitude.

scholarly journals The Role of the Rainfall Variability in the Decline of the Surface Suspended Sediment in the Upper Madeira Basin (2003–2017)

2021 ◽  
Vol 3 ◽  
Author(s):  
Irma Ayes Rivera ◽  
Jorge Molina-Carpio ◽  
Jhan Carlo Espinoza ◽  
Omar Gutierrez-Cori ◽  
Wilmar L. Cerón ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Amazon Basin ◽  
Environmental Changes ◽  
Rainfall Variability ◽  
Water Discharge ◽  
Critical Issue ◽  
Base Flow ◽  
Rainfall Time Series ◽  
Madeira River

The Madeira River rises in the Andes, draining the southwestern Amazon basin and contributing up to 50% of the Amazon River sediment load. The Porto Velho station monitors the Upper Madeira basin and is located just downstream of the Jirau and Santo Antonio hydropower dams. At this station, decreasing trend (p < 0.10) of the surface suspended sediment concentration (SSSC) has been documented during the sediment peak season (December to February) for the 2003–2017 period. This study aims to evaluate the role of the rainfall variability on this documented decreasing trend. For this purpose, we applied correlation and trend analysis in water discharge, SSSC and rainfall time series over the main tributaries of the Upper Madeira basin. The decline of SSSC in December is attributed to the reduction of rainfall in the Madre de Dios sub-basin from the start of the rainy season in October. However, the SSSC negative trend (p < 0.10) in January and February is associated with a shift in the magnitude of rainfall during these months in the Andean region after 2008, and the dilution associated with base flow. These results reveal that the decline of SSSC in the Madeira River should not be evaluated just on the basis of the data downstream from the dams, but also of the processes upstream in the Andean part of the basin. In a context of drastic anthropogenic climate and environmental changes, understanding the combined influence of regional hydroclimate variability and human actions on erosion and sediment transport remains a critical issue for the conservation of the Amazon-Andes system.

scholarly journals The biosonar of the boto: evidence of differences among species of river dolphins (Inia spp.) from the Amazon

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11105
Author(s):  
Jéssica F. Melo ◽  
Thiago O. S. Amorim ◽  
Mariana Paschoalini ◽  
Artur Andriolo
Keyword(s):  
Amazon Basin ◽  
Conservation Status ◽  
River System ◽  
Peak Frequency ◽  
Acoustical Parameters ◽  
Araguaia River ◽  
The Family ◽  
Madeira River ◽  
Inia Geoffrensis ◽  
Species Specific

Echolocation clicks can reflect the anatomy of the vocalizing animal, enabling the distinction of species. River dolphins from the family Iniidae are formally represented by one species and two subspecies (Inia geoffrensis geoffrensis and I. g. humboldtiana). Additionally, two other species have been proposed (I. boliviensis and I. araguaiaensis) regarding its level of restricted distribution and morph-genetics differences. For the Committee on Taxonomy of the Society for Marine Mammalogy, the specific status of the proposed species relies on further knowledge on morphology, ecology, and genetics. Given that species-specific status is required for conservation efforts, we described and compared the echolocation clicks of Inia spp., searching for specific differences on their vocalizations. The sounds were captured with a Cetacean Research ™ C54XRS (+3/−20 dB, −185 dB re: 1V/μPa) in Guaviare River (Orinoco basin), Madeira River (Madeira basin), Xingu River (Amazon Basin), and Araguaia River (Tocantins-Araguaia basin). We found significant differences in all analyzed parameters (peak frequency, 3 dB bandwidth, 10 dB bandwidth and inter-click interval) for all species and subspecies. Differences in acoustical parameters of clicks are mainly related to the animal’s internal morphology, thus this study may potentially support with information for the species-level classification mostly of I. araguaiaensis (the Araguaian boto). Classifying the Araguaian boto separately from I. geoffrensis has important implications for the species in terms of conservation status, since it is restricted to a highly impacted river system.

scholarly journals Impacts of a large hydroelectric dam on the Madeira River (Brazil) on floodplain avifauna

2021 ◽  
Vol 51 (4) ◽  
pp. 298-310
Author(s):  
Tomaz Nascimendo de MELO ◽  
Marconi Campos CERQUEIRA ◽  
Fernando Mendonça D’HORTA ◽  
Hanna TUOMISTO ◽  
Jasper Van DONINCK ◽  
...  
Keyword(s):  
Amazon Basin ◽  
Bird Species ◽  
Floodplain Forest ◽  
Dam Construction ◽  
Automated Classification ◽  
Forest Sites ◽  
Madeira River ◽  
Seasonally Flooded ◽  
Successional Vegetation ◽  
Reservoir Filling

ABSTRACT Hydroelectric dams represent an important threat to seasonally flooded environments in the Amazon basin. We aimed to evaluate how a dam in the Madeira River, one of the largest tributaries of the Amazonas River, affected floodplain avifauna. Bird occurrence was recorded through simultaneous passive acoustic monitoring in early successional vegetation and floodplain forest downstream from the dam and upstream in sites impacted by permanent flooding after dam reservoir filling. Species were identified through manual inspection and semi-automated classification of the recordings. To assess the similarity in vegetation between downstream and upstream sites, we used Landsat TM/ETM+ composite images from before (2009-2011) and after (2016-2018) reservoir filling. Downstream and upstream floodplain forest sites were similar before, but not after dam construction. Early successional vegetation sites were already different before dam construction. We recorded 195 bird species. While species richness did not differ between upstream and downstream sites, species composition differed significantly. Ten species were indicators of early successional vegetation upstream, and four downstream. Ten species were indicators of floodplain forest upstream, and 31 downstream. Seven of 24 floodplain specialist species were detected by the semi-automated classification only upstream. While we found some bird species characteristic of early successional vegetation in the upstream sites, we did not find most species characteristic of tall floodplain forest. Predominantly carnivorous, insectivorous, and nectarivorous species appear to have been replaced by generalist and widely distributed species.

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