scholarly journals Checklist of benthic algae from beaches and rocky outcrops on the northeast coast of Pará state, Brazilian Amazonia

2021 ◽  
Vol 51 (2) ◽  
pp. 166-170
Author(s):  
Alexandre de Gusmão PEDRINI¹ ◽  
Gabriel Irene Pereira GUARINO¹ ◽  
Felipe dos Santos Pereira DINIZ¹ ◽  
José Eduardo MARTINELLI FILHO
Keyword(s):  
Benthic Algae ◽  
Brazilian Amazon ◽  
Artificial Substrates ◽  
Laguncularia Racemosa ◽  
Geographic Scale ◽  
Brazilian Amazonia ◽  
Rocky Outcrops ◽  
Northeast Coast

ABSTRACT We present a checklist with 23 taxa of the benthic phycological flora on three beaches on the northeast coast of Pará state, in the Brazilian Amazon, a rarely surveyed area for algae. Collections were made on substrates like rocky outcrops at Salinópolis municipality, and on trunks, branches and pneumatophores of Laguncularia racemosa and artificial substrates at Marapanim municipality. Despite the limited geographic scale of the sampling, we provide ten new citations for the benthic, marine and estuarine algal taxa of the Pará state coast: six Chlorophyta (Bryopsis pennata, Cladophora coelothrix, C. conferta, Gayralia brasiliensis, Pseudorhizoclonium africanum and Ulva chaetomorphoides), two Rhodophyta (Caloglossa confusa, Centroceras gasparrinii), one Ochrophyta (Bachelotia antillarum) and one Cyanophyta (Coleofasciculus chthonoplastes).

scholarly journals Hydroelectric Dams in the Brazilian Amazon as Sources of ‘Greenhouse’ Gases

1995 ◽  
Vol 22 (1) ◽  
pp. 7-19 ◽  
Author(s):  
Philip M. Fearnside
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Gases ◽  
Forest Biomass ◽  
Open Water ◽  
Brazilian Amazon ◽  
Methane Emissions ◽  
Hydroelectric Dams ◽  
Brazilian Amazonia ◽  
Methane Release ◽  
Gas Fluxes

Existing hydroelectric dams in Brazilian Amazonia emitted about 0.26 million tons of methane and 38 million tons of carbon dioxide in 1990. The methane emissions represent an essentially permanent addition to gas fluxes from the region, rather than a one-time release. The total area of reservoirs planned in the region is about 20 times the area existing in 1990, implying a potential annual methane release of about 5.2 million tons. About 40% of this estimated release is from underwater decay of forest biomass, which is the most uncertain of the components in the calculation. Methane is also released in significant quantities from open water, macrophyte beds, and above-water decay of forest biomass.

scholarly journals Checklist and key of genera and species of the Lamiaceae of the Brazilian Amazon

Rodriguésia ◽  
2012 ◽  
Vol 63 (1) ◽  
pp. 129-144 ◽  
Author(s):  
Raymond Mervyn Harley
Keyword(s):  
Brazilian Amazon ◽  
Brazilian Amazonia ◽  
Herbarium Voucher

A checklist and keys are provided for Lamiaceae native to Brazilian Amazonia (eight genera and 42 species), excluding the genera Vitex, Volkameria, Aegiphila and Amasonia, which have recently been transferred from the Verbenaceae, and for which the author did not have data. An herbarium voucher is listed for each state in which the species has been found. Notes on many cultivated taxa are included, and also a key to all species of Ocimum known from Brazil.

Two new species of Opeatocerata Melander (Diptera, Empididae, Empidinae) from the Brazilian Amazon Basin

Zootaxa ◽  
2011 ◽  
Vol 3062 (1) ◽  
pp. 37 ◽  
Author(s):  
J. T. CÂMARA ◽  
J. A. RAFAEL
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Brazilian Amazon ◽  
First Record ◽  
Brazilian Amazonia ◽  
Two New Species

Two new species of the Neotropical genus of Empidinae, Opeatocerata: O. trilobata sp. nov. and O. melanderi sp. nov., are described and illustrated from Manaus. This is the first record of the genus from Brazilian Amazonia.

Life at the river's edge: ecology of Kentropyx altamazonica in Brazilian Amazonia

2001 ◽  
Vol 79 (10) ◽  
pp. 1855-1865 ◽  
Author(s):  
Laurie J Vitt ◽  
Shawn S Sartorius ◽  
Teresa Cristina S Avila-Pires ◽  
Maria Cristina Espósito
Keyword(s):  
Cloud Cover ◽  
Brazilian Amazon ◽  
The Other ◽  
Body Temperatures ◽  
Insect Larvae ◽  
Brazilian Amazonia ◽  
Air Temperatures ◽  
Brazilian Amazon Region ◽  
Body Sizes ◽  
Water Courses

The teiid lizard Kentropyx altamazonica was studied at two localities in the Brazilian Amazon region, one in Amazonas (Rio Ituxi) and the other in Rondônia (Rio Formoso). This lizard is linearly distributed along water courses, where it carries on most activities in well-lit, warm microhabitats. Activity does not occur on days with cloud cover. Late morning and midday activity predominates on sunny days. Body temperatures of active lizards were 35.9 ± 0.37°C (mean ± SE) and were higher than substrate or air temperatures at the point of capture and higher than overall temperatures in the habitat. Although a variety of prey types are eaten, spiders, grasshoppers and crickets, roaches, and insect larvae dominate the diet. Larger lizards eat larger prey but also include small prey in their diets. Absolute and relative prey sizes were greater for lizards at the Rio Ituxi than for those in Rondônia, but lizard stomachs were equally full, suggesting that prey types available varied between sites. Males reach larger body sizes than females and have relatively larger heads. Although K. altamazonica is similar in ecology to other Amazonian Kentropyx species, it is more closely associated with water than the others.

Isertia psammophila (Isertieae, Rubiaceae), a new species from white-sand areas of the Brazilian Amazon

Phytotaxa ◽  
2016 ◽  
Vol 257 (2) ◽  
pp. 174 ◽  
Author(s):  
Nállarett Dávila ◽  
Alberto Vicentini
Keyword(s):  
New Species ◽  
National Park ◽  
Brazilian Amazon ◽  
Morphological Characters ◽  
Molecular Evidence ◽  
White Sand ◽  
Brazilian Amazonia ◽  
A New Species

Isertia psammophila, a new species from the white-sand campinarana forests in Northern Brazilian Amazonia is here described and illustrated. While molecular evidence indicates that it is closely related to I. rosea, I. parviflora and I. spiciformis, morphologically it is most similar to I. rosea by its short stipules and glabrescent leaves. Isertia psammophila occurs in sympatry with I. rosea and I. parviflora in the Viruá National Park, Roraima, Brazil, and these three species can be easily differentiated by morphological characters, which are here discussed.

Morphology of the Vessel Elements in the Secondary Xylem of the Myristicaceae from Brazilian Amazonia

IAWA Journal ◽  
1987 ◽  
Vol 8 (3) ◽  
pp. 202-212 ◽  
Author(s):  
Pedro L. B. Lisboa ◽  
J. Cesar A. da Silva ◽  
A. A. Loureiro ◽  
Gracielza M. dos A. dos Santos
Keyword(s):  
Morphological Study ◽  
Secondary Xylem ◽  
Brazilian Amazon ◽  
Amazon Region ◽  
Simple Type ◽  
Brazilian Amazonia ◽  
Brazilian Amazon Region ◽  
Vessel Elements ◽  
Perforation Plates

A morphological study of vessel elements was carried out in species representing the five genera of Myristicaceae present in the Brazilian Amazon region. The results show that perforation plates of the scalariform type predominate in Compsoneura, Iryanthera and Otoba, where as perforation plates of the simple type predominate in Osteophloeum and Virola. The phylogenetic and taxonomie implications of these findings are discussed.

Responses of crocodilians to construction of a hydroelectric dam on the Madeira River in the Brazilian Amazon

2020 ◽  
pp. 215-221
Author(s):  
Zilca Campos
Keyword(s):  
Water Level ◽  
Apparent Density ◽  
Size Structure ◽  
Brazilian Amazon ◽  
Population Characteristics ◽  
Affected Area ◽  
Brazilian Amazonia ◽  
Caiman Crocodilus ◽  
Hydroelectric Dam ◽  
Madeira River

The spillways of the Santo Antônio Hydro-electric Dam on the Madeira River in Brazilian Amazonia were closed in November 2011, inundating more than 100 km of river and reducing the annual fluctuations in water level. We surveyed the crocodilians in the affected area for two years before and for eight years after dam filling in order to evaluate the effects of the dam on the size structure of the population, the distribution of each species, and the detectability of individuals to interpret changes in apparent density. Our methodology was probably not appropriate to evaluate trends in population characteristics of Paleosuchus palpebrosus or P. trigonatus, but there was little evidence of an effect of the dam on the numbers of Caiman crocodilus and Melanosuchus niger in the area, and the distributions of all caiman species along the river changed only slightly after the dam was constructed. However, the proportions of small C. crocodilus and large M. niger detected in surveys increased eight years after dam filling. Despite having detectable effects on some population characteristics, the dam does not appear to represent a threat to the persistence of the species in the area if deforestation along the banks of the reservoir can be avoided.

scholarly journals Terrestrial gastropods of Humaitá Forest Reserve, southwestern Brazilian Amazon

Check List ◽  
2021 ◽  
Vol 17 (1) ◽  
pp. 269-281
Author(s):  
Marcos Silva de Lima ◽  
Fernanda dos Santos Silva ◽  
Luiz Ricardo Lopes Simone ◽  
Rodrigo Brincalepe Salvador ◽  
Edson Guilherme
Keyword(s):  
Brazilian Amazon ◽  
Forest Fragment ◽  
Forest Reserve ◽  
Brazilian Amazonia ◽  
Terrestrial Gastropods ◽  
Molluscan Fauna ◽  
First Time

The molluscan fauna of southwestern Brazilian Amazonia is poorly known due to the lack of focused collection areas in the region since the early 20th century. The present study provides an inventory of the terrestrial gastropods from a forest fragment in the eastern Acre state, Brazil: the Humaitá Forest Reserve (“Reserva Florestal Humaitá”). Live specimens and empty shells were collected between August 2018 and January 2019. A total of 20 species were identified, distributed in 11 families. Most (13) of these species were recorded in Acre for the first time. Furthermore, we confirm the occurrence of Systrophia helicycloides (d’Orbigny, 1835) in Brazil, reiterate the synonymy of Plekocheilus pentadinus (d’Orbigny, 1835) with P. floccosus (Spix in Wagner, 1827), and synonymize Solaropsis peruviana Haas, 1951 with S. juruana Ihering, 1905.

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