scholarly journals Structure and biodiversity of zooplankton communities in freshwater habitats of a Vereda Wetland Region, Minas Gerais, Brazil

2015 ◽  
Vol 27 (3) ◽  
pp. 275-288 ◽  
Author(s):  
Olívia Penatti Pinese ◽  
José Fernando Pinese ◽  
Kleber Del Claro
Keyword(s):  
Aquatic Macrophytes ◽  
Biological Diversity ◽  
Zooplankton Community ◽  
Environmental Parameters ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Brazilian Savannah ◽  
Local Diversity ◽  
Freshwater Habitats ◽  
The Difference

Abstract Aims: Vereda wetlands are among the most important aquatic habitats in Brazilian savannah (Cerrado) because of their association with river springs and its relevancy for biodiversity conservation. This study aimed to determine and compare the biodiversity of zooplankton in vereda lakes, differentiated by the presence or absence of aquatic macrophytes at an environmental reserve in Uberlândia, Minas Geais, Southeastern Brazil. Zooplanctonic abundance patterns and their relation with environmental parameters were also discussed and presented through multivariate statistics. Methods Twelve samples were taken at water surface, at 15-day intervals in 2006. It was observed a total richness of 75 species, including 12 genera, 29 species and one sub-species as new records for Minas Gerais State. Results Rotifers were the predominant group and Lecanidae was the most diverse family. Among cladocerans, Chydoridae showed the greatest richness and Bosminidae the highest abundance. Few adult copepods were sampled in this study, but nauplii were very frequent. Cyclopidae was the most common family among copepods and there was no record of Calanoida. Conclusions The difference in composition among the studied lakes was remarkable. The lake with macrophytes showed the greatest richness but the lowest density, and the opposite situation occurred in the other lake. This can be explained by the fact that aquatic macrophytes, as primary producers, exert a bottom-up effect on zooplankton community, sustaining a high local diversity in contrast with a low numeric abundance of these microorganisms. Therefore, this pattern may have been created by the surround heterogeneity and, at the same time, by the reduction of available minerals of the system caused by macrophyte matter fixation. Many studies on zooplankton need to be developed in palm swamp communities in order to better comprehend the biological diversity and the energy balance in different habitats for the conservation of aquatic ecosystems.

Information support for expert evaluation of the states of the external environment

2020 ◽  
pp. 71-76
Author(s):  
Rasol Murtadha Najah
Keyword(s):  
Decision Making ◽  
Environmental Conditions ◽  
Fuzzy Inference ◽  
Environmental Parameters ◽  
Information Support ◽  
Expert Assessment ◽  
Fuzzy Variables ◽  
Decision Making Models ◽  
The Difference ◽  
State Of The Environment

This article discusses the application of methods to enhance the knowledge of experts to build a decision-making model based on the processing of physical data on the real state of the environment. Environmental parameters determine its ecological state. To carry out research in the field of expert assessment of environmental conditions, the analysis of known works in this field is carried out. The results of the analysis made it possible to justify the relevance of the application of analytical, stochastic models and models based on methods of enhancing the knowledge of experts — experts. It is concluded that the results of using analytical and stochastic objects are inaccurate, due to the complexity and poor mathematical description of the objects. The relevance of developing information support for an expert assessment of environmental conditions is substantiated. The difference of this article is that based on the analysis of the application of expert methods for assessing the state of the environment, a fuzzy logic adoption model and information support for assessing the environmental state of the environment are proposed. The formalization of the parameters of decision-making models using linguistic and fuzzy variables is considered. The formalization of parameters of decision-making models using linguistic and fuzzy variables was considered. The model’s description of fuzzy inference is given. The use of information support for environment state assessment is shown on the example of experts assessing of the land desertification stage.

A New Species of the Scinax catharinae Species Group (Anura: Hylidae) from Minas Gerais, Southeastern Brazil

Herpetologica ◽  
2009 ◽  
Vol 65 (4) ◽  
pp. 468-479 ◽  
Author(s):  
Ana Carolina Calijorne Lourenço ◽  
Luciana Barreto Nascimento ◽  
Maria Rita Silvério Pires
Keyword(s):  
New Species ◽  
Species Group ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
A New Species

A new species of Microvelia Westwood, 1834 (Hemiptera: Heteroptera: Veliidae) from southeastern Brazil

Zootaxa ◽  
2021 ◽  
Vol 4958 (1) ◽  
pp. 160-166
Author(s):  
OSÉIAS MARTINS MAGALHÃES ◽  
GUSTAVO LISBOA VIEIRA MACHADO ◽  
MARCO ANTONIO ALVES CARNEIRO ◽  
FELIPE FERRAZ FIGUEIREDO MOREIRA
Keyword(s):  
New Species ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Minas Gerais State ◽  
A New Species

Microvelia joceliae Magalhães & Moreira, sp. nov. is described and illustrated based on material from Parque Natural Municipal das Andorinhas, Minas Gerais State, in southeastern Brazil. The new species can be distinguished from congeners occurring in the region by the pronotum of the apterous form covering almost the entire thorax dorsally, proepisternum with black denticles, male abdominal segments V–VII ventrally depressed, shape of the asymmetrical parameres, and female abdominal laterotergites reflected over the mediotergites and almost touching over segments V–VII. 

A new species of Calea (Neurolaeneae, Asteraceae) from the Atlantic Forest, Minas Gerais, southeastern Brazil

Phytotaxa ◽  
2021 ◽  
Vol 494 (1) ◽  
pp. 129-136
Author(s):  
GENILSON ALVES DOS REIS E SILVA ◽  
JIMI NAOKI NAKAJIMA
Keyword(s):  
New Species ◽  
Atlantic Forest ◽  
Conservation Status ◽  
Minas Gerais ◽  
The State ◽  
Identification Key ◽  
Southeastern Brazil ◽  
Distribution Map ◽  
A New Species

A new species, Calea arachnoidea, which belongs to Calea sect. Meyeria, is hereby described and illustrated. This species occurs in the Serra Negra region, located in the southern portion of the “Zona da Mata” in the state of Minas Gerais, southeastern Brazil. Calea arachnoidea resembles C. quadrifolia, C. heteropappa and C. semirii, and its relationships with these species are discussed and an identification key for the species of C. sect. Meyeria in the state of Minas Gerais is provided. Additionally, photographs, a distribution map, comments about habitat and conservation status are provided.

scholarly journals The complex vocalization of Scinax cardosoi (Anura: Hylidae), with comments on advertisement calls in the S. ruber Clade

2015 ◽  
Vol 14 (2) ◽  
pp. 127 ◽  
Author(s):  
Thiago Ribeiro de Carvalho ◽  
Lucas Borges Martins ◽  
Ariovaldo Antonio Giaretta
Keyword(s):  
Original Description ◽  
Minas Gerais ◽  
The Other ◽  
Single Type ◽  
Southeastern Brazil ◽  
Advertisement Calls ◽  
Call Duration ◽  
Phenotypic Characters ◽  
Acoustic Data ◽  
Lower Amplitude

The complex vocalization of Scinax cardosoi (Anura: Hylidae), with comments on advertisement calls in the S. ruber Clade. The complex vocalization of Scinax cardosoi from a population of Minas Gerais in southeastern Brazil is described and compared with available acoustic data for the other species of the S. ruber Clade. Three distinct types of high-pitched, pulsed calls were identified, and are referred to as “short,” “long,” and “trilled” calls. Short calls (16–66 ms) resemble squeaks, and consist of a pulsed signal (8–28 pulses/call) with regular amplitude modulations throughout their duration; the amplitude peak occurs at about the midpoint of the call duration. Long calls (268–518 ms) resemble giggles, and have lower amplitude than short calls; typically, they consist of pulsed note series (1–6 notes/call). Trilled calls resemble insect chirps and have the lowest amplitude of the three call types; they consist of long (1.1–3.0 s) pulsed note series (9–25 notes/call). Acoustic data are taxonomically informative in the Scinax ruber Clade and provide phenotypic characters diagnosing S. cardosoi in addition to those features proposed in its original description. The vocalization repertoire of S. cardosoi resembles the complex vocal repertoires (i.e., multiple call types emitted in variable combinations) of members of the S. catharinae Clade more than some species of the S. ruber Clade, which tend to have simpler call structures (i.e., a single type of multipulsed note).

scholarly journals Nest architecture of the stingless bee Geotrigona subterranea (Friese,1901) (Hymenoptera: Apidae: Meliponini)

2013 ◽  
Vol 13 (1) ◽  
pp. 147-152 ◽  
Author(s):  
Fernando Mendes Barbosa ◽  
Rogério Marcos de Oliveira Alves ◽  
Bruno de Almeida Souza ◽  
Carlos Alfredo Lopes de Carvalho
Keyword(s):  
Minas Gerais ◽  
Stingless Bee ◽  
Southeastern Brazil ◽  
Nest Architecture ◽  
Congeneric Species ◽  
Nest Structure ◽  
Transition Area

We located ten nests of Geotrigona subterranea in the transition area between Cerrado and Caatinga within the municipalities of Lontra and Januária, state of Minas Gerais, southeastern Brazil. We collected the nests to study their architecture in detail. In the present paper, we describe the general nest structure of this bee species in terms of: number, shape and area of the combs; size of the brood cells; size of honey and pollen pots; volume of honey and mass of pollen stored in closed pots; presence of inquiline species; and defensive characteristics. All nests were found in subterranean cavities. The nest structure of G. subterranea is similar to that of other congeneric species.

scholarly journals Evidence for biological inheritance of the eosinophil response to internal parasites in southeastern Brazil

1999 ◽  
Vol 22 (4) ◽  
pp. 481-485 ◽  
Author(s):  
Fátima Conti ◽  
Glória M. Duccini Dal' Colletto ◽  
Mary Furlan Feitosa ◽  
Henrique Krieger
Keyword(s):  
Segregation Analysis ◽  
Familial Aggregation ◽  
Major Gene ◽  
Minas Gerais ◽  
The State ◽  
Southeastern Brazil ◽  
Nuclear Families ◽  
Internal Parasites ◽  
Intestinal Worms

One hundred and seventy-seven individuals belonging to 120 complete or incomplete nuclear families from Bambui, in the State of Minas Gerais, southeastern Brazil, were studied in order to examine causes of variation in the eosinophil rate among subjects infested by intestinal worms with an extra-digestive cycle. Segregation analysis without correction for skewness showed that the hypothesis of the presence of an additive major gene was consistent with the data, although a dominant, recessive, or a multifactorial hypothesis could not account properly for the observed significant familial aggregation. The most parsimonious correction for skewness showed similar results, but could not distinguish between dominant and recessive models, although co-dominance was rejected. Since these models assume that skewness was attributable to the commingling of two distributions, these results seem to agree with those for uncorrected data. These findings suggest that several genetically independent factors determine the resistance/susceptibility to helminth infestation mainly through their ability to influence the eosinophil response.

A new species of Leptodactylus Fitzinger (Anura, Leptodactylidae) from Serra do Brigadeiro, State of Minas Gerais, Southeastern Brazil

Zootaxa ◽  
2008 ◽  
Vol 1861 (1) ◽  
pp. 44 ◽  
Author(s):  
ULISSES CARAMASCHI ◽  
RENATO N. FEIO ◽  
VINÍCIUS A. SÃO-PEDRO
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Dominant Frequency ◽  
Species Group ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Advertisement Call ◽  
Large Size ◽  
O 31 ◽  
A New Species

A new species of Leptodactylus belonging to the L. fuscus species group, and related to the L. mystaceus complex, is described from the Lagoa das Bromélias (20 o 53’S, 42 o 31’W; 1,227 m above sea level), Parque Estadual da Serra do Brigadeiro, Municipality of Ervália, State of Minas Gerais, Southeastern Brazil. Leptodactylus cupreus sp. nov. is characterized by the large size for the group (SVL 50.1–55.1 mm in males) and color pattern. The new species has a non-pulsed advertisement call, with call rate about 12 calls/s and a dominant frequency between 2,800 and 3,058 Hz.

scholarly journals The inverted trophic cascade in tropical plankton communities: impacts of exotic fish in the Middle Rio Doce lake district, Minas Gerais, Brazil

2008 ◽  
Vol 68 (4 suppl) ◽  
pp. 1025-1037 ◽  
Author(s):  
RM. Pinto-Coelho ◽  
JF. Bezerra-Neto ◽  
F. Miranda ◽  
TG. Mota ◽  
R. Resck ◽  
...  
Keyword(s):  
Fish Fauna ◽  
Zooplankton Community ◽  
Minas Gerais ◽  
Ecological Impacts ◽  
Trophic Levels ◽  
Lake District ◽  
Exotic Fish ◽  
Ecological Release ◽  
Piscivorous Fish ◽  
Cladoceran Species

The present study deals with the ecological impacts of the introduction of two alien species of piscivorous fish in several lakes of the Middle Rio Doce lake district in Minas Gerais, Brazil. It was demonstrated that these effects were not restricted only to the fish community. The introduction of the predatory red piranha Pygocentrus nattereri and the tucunaré Cichla cf. ocellaris caused not only a sharp decrease in the number of native fish species, but also major shifts in other trophic levels. Just after the fish were introduced, most lakes began to show conspicuous changes in phytoplankton species composition, in which Cyanophyceae gradually came to dominate. The zooplankton community lost several species, and in some cases, such as Lake Carioca, all the cladoceran species disappeared. On the other hand, invertebrate predators, represented by the dipteran Chaoboridae, boomed in the lake, with higher densities of exotic species, probably as a result of the "ecological release" by reduction of the original fish fauna. There was a general trend of species loss in different trophic levels. All these changes are apparently associated with decreases in water quality. The present situation in these lakes demands new approaches to the management and conservation of these ecosystems.

scholarly journals Amphibia, Anura, Hylodidae, Megaelosia apuana Pombal, Prado and Canedo, 2003: distribution extension, new state record and geographic distribution map

Check List ◽  
2011 ◽  
Vol 7 (4) ◽  
pp. 394 ◽  
Author(s):  
Patrícia Da Silva Santos ◽  
Emanuel Teixeira da Silva ◽  
Bruno Henrique Barbosa Felhberg ◽  
Marcus Thadeu Teixeira Santos ◽  
Paulo Christiano De Anchietta Garcia
Keyword(s):  
Geographic Distribution ◽  
First Record ◽  
Minas Gerais ◽  
The State ◽  
Type Locality ◽  
Southeastern Brazil ◽  
Distribution Map

In this study we report the first record of the giant torrent frog Megaelosia apuana in the state of Minas Gerais, southeastern Brazil. The finding of this species at Reserva Particular do Patrimônio Natural (RPPN) Mata do Sossego, municipality of Simonésia, east of Minas Gerais extends its geographic distribution by 120 km from the type locality, and 45 km northwest from its westernmost known record. A geographic distribution map is presented. 

Sign in / Sign up

Export Citation Format

Share Document