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| Registros recuperados: 157 | |
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| Özbay,H. |
| The phytoplankton of the Kars River was studied from May to October 2005 at five sampling stations. Sixty-six phytoplankton taxa were determined, consisting of Cyanophyta (9), Chlorophyta (25), Euglenophyta (18), Bacillariophyta (7), Cryptophyta (3), Dinophyta (1) and Chrysophyta (3). Total phytoplankton density increased from May to July and then decreased until October. The dominant phytoplankton group was Cyanophyta (36.5 - 64.4%) for most of the study period, followed by Bacillariophyta (20.4 - 38.7%) and Chlorophyta (20.9 - 28.9%). Temperature, pH and dissolved oxygen ranged from 9.6 °C to 21.6 °C; 7.6 to 8.0, and 5.9 to 7.4 mg/L, respectively. Chlorophyl a level changed from 0.0025 to 0.0059 mg/L. On the other hand, both phosphate and nitrogen levels... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: River Kars; Running water; Phytoplankton; Environmental factors. |
| Ano: 2011 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100013 |
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| VIDAL,R.A.; FIPKE,M.V.; QUEIROZ,A.R.S.; SOARES,D.S.; GHEREKHLOO,J.. |
| ABSTRACT Temperature affects the selectivity of post-emergence herbicides in a complex manner. The objective of this work was to develop a method to estimate the impact of temperature on herbicide selectivity using the white oat (Avena sativa) crop and iodosulfuron-methyl as study models. Greenhouse/growth-chamber experiments were conducted using a completely randomized design with the treatments arranged as a bi-factorial, with three repetitions. The first factor consisted of six temperatures (10, 15, 20, 24, 28 and 32 oC) to which the plants were submitted during one week after the herbicide spray. The second factor corresponded to seven doses of iodosulfuron-methyl (0, 0.2, 0.4, 0.8, 1.2, 5 and 20 g ha-1). For each temperature, regression curves were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena sativa; Crop tolerance; Environmental factors; Herbicide detoxification. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100246 |
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| Gerpacio, Roberta V.; Pingali, Prabhu L.. |
| This book examines future technological and policy prospects for the sustainable intensification of rainfed upland maize production in Asia, and derives R&D priorities for specific maize production environments and markets. Village-level and farmer-group surveys were conducted to characterize upland maize production environments and systems in China, India, Indonesia, Nepal, the Philippines, Thailand, and Vietnam. Survey findings, particularly farmer-identified constraints to maize production, complemented with other relevant data, were used in country-level, R&D priority-setting workshops. High on the list of farmer constraints was drought, estimated to affect three production environments that are home to about 48 million rural poor and produce... |
| Tipo: Book |
Palavras-chave: Maize; Agricultural development; Farming systems; Production policies; Environmental factors; Cropping systems; Research projects; Project management; Asia; Crop Production/Industries; E10. |
| Ano: 2007 |
URL: http://purl.umn.edu/56107 |
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| Nettesheim,Felipe Cito; Conto,Tiago de; Pereira,Marcos Gervasio; Machado,Deivid Lopes. |
| Natural processes that determine soil and plant litter properties are controlled by multiple factors. However, little attention has been given to distinguishing the effects of environmental factors from the effects of spatial structure of the area on the distribution of soil and litter properties in tropical ecosystems covering heterogeneous topographies. The aim of this study was to assess patterns of soil and litter variation in a tropical area that intercepts different levels of solar radiation throughout the year since its topography has slopes predominantly facing opposing geographic directions. Soil data (pH, C, N, P, H+Al, Ca, Mg, K, Al, Na, sand, and silt) and plant litter data (N, K, Ca, P, and Mg) were gathered together with the geographic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical forest; Spatial factors; Environmental factors; Slope geographic orientation; Soil chemistry; Litter chemistry. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300750 |
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| Medeiros,Jeniffer; Araújo,Arrilton; Araújo,Helder F. P.; Queiroz,João Paulo C.; Vasconcellos,Alexandre. |
| Seasonal activity of Dinoponera quadriceps Santschi (Formicidae, Ponerinae) in the semi-arid Caatinga of northeastern Brazil. We studied seasonal foraging patterns of the queenless ant D. quadriceps (Formicidae, Ponerinae) for 24 months in a Caatinga area of northeastern Brazil, an ecosystem characterized by strong climatic changes throughout the year, in order to determine if regulation of worker activity is based on environmental conditions (air temperature, relative humidity, precipitation) and/or food resources (potential prey: Coleoptera, Diptera, Hemiptera, Hymenoptera, Lepidoptera, Orthoptera, Araneae, Chilopoda and Diplopoda). Foraging activity of D. quadriceps varied over the course of both years, with the highest frequency occurring from May to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ants; Environmental factors; Foraging; Neotropical region; Seasonality. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000100013 |
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| Siqueira,Carla C.; Vrcibradic,Davor; Nogueira-Costa,Paulo; Martins,Angele R.; Dantas,Leonardo; Gomes,Vagner L. R.; Bergallo,Helena G.; Rocha,Carlos Frederico D.. |
| Despite a recent increase of information on leaf litter frog communities from Atlantic rainforests, few studies have analyzed the relationship between environmental parameters and community structure of these animals. We analyzed the effects of some environmental factors on a leaf litter frog community at an Atlantic Rainforest area in southeastern Brazil. Data collection lasted ten consecutive days in January 2010, at elevations ranging between 300 and 520 m above sea level. We established 50 quadrats of 5 x 5 m on the forest floor, totaling 1,250 m² of sampled area, and recorded the mean leaf-litter depth and the number of trees within the plot, as well as altitude. We found 307 individuals belonging to ten frog species within the plots. The overall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Frog richness; Density estimates; Environmental factors. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000200005 |
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| Araújo,Cristiane S.; Candido,Denise M.; Araújo,Helder F. P. de; Dias,Sidclay C.; Vasconcellos,Alexandre. |
| Seasonal variations in scorpion activity were investigated during a 24 month period in an area of Caatinga (dryland) vegetation in the state of Paraíba, Brazil. The total number of scorpions captured was correlated with climatic variables and prey abundance. Scorpions were captured monthly using pitfall traps; their potential prey was captured using malaise, beating trays and pitfalls. A total of 104 scorpions were captured, representing four species: the bothriurids Bothriurus asper (Pocock, 1893) (n = 74; 71.2%) and B. rochai (Mello-Leitão, 1932) (n = 20; 19.2%), and the buthids Rhopalurus rochai (Borelli, 1910) (n = 4; 3.8%) and Tityus stigmurus (Thorell, 1876) (n = 1; 1.0%). The sex ratios (male:female) of the two most abundant species were 14:1 for B.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental factors; Neotropical region; Reproduction; Semi-arid; Seasonality. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000300008 |
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| Paksoy,Yavuzkan; Ünal,Necmettin. |
| ABSTRACT The objective of this study was to determine the effects of morphometric measurements on race performance (m/sec) of Thoroughbred horses. Data of morphometric measurements (withers height, rump height, chest girth, chest width, front chest width, chest depth, neck length, shoulder length, length of withers to rump, rump length, body length, head width, head length, and cannon circumference) were taken from 244 Thoroughbred horses chosen at random. A total of 2888 racing records were considered for race performance. The effects of environmental factors on morphometric measurements (stallion, gender, age, and mother age) and race performance (gender, age, mother age, year, hippodrome, race distance, racetrack, and race type) were analyzed using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental factors; Morphometric measurements; PCA; Flat racing. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100511 |
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| Araújo,Janaina P.; Araújo,Maria E.; Souto,Antonio; Parente,Cristiano L.; Geise,Lena. |
| Data on Sotalia guianensis Van Bénéden, 1864 occurrence on the beaches of Pernambuco (Northeastern Brazil) is restricted to information on stranding and on printed material from local newspapers; actual observations of such animals have not been published. This study intends to determine the use of habitat, behavioral activities and assess the relationships between environmental factors and the recorded behavior. Observations were conducted on open sea coastal areas, on the beaches of Olinda and Piedade, as well as in sheltered areas, in the ports of Recife and Suape. Monitoring was carried out every month in each area, during two consecutive days, from September 2004 to August 2005. Results corroborate that this species prefers to occupy more protected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavioral activities; Environmental factors; Estuarine dolphin. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000400032 |
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| Dias-Terceiro,Randolpho Gonçalves; Peixoto,Gabriela Marques; Gomes,Vitor Serrano; Menezes,Marcelo Costa; Neco,Eudécio Carvalho; Pessoa,Tainá Sherlakyann Alves; Fabricante,Juliano Ricardo; Albuquerque,Manoel Bandeira. |
| Epiphytes are common in the canopy of temperate and tropical forests, where they substantially contribute to species diversity and to key ecosystem processes. However, little is known about the effects caused by deforestation on this group of species, especially in northeastern Brazil, an area experiencing intense anthropogenic pressure. This study aimed to evaluate the effect of environmental variables on the structure of assemblies of vascular epiphytes in a fragment of open ombrophilous forest, Areia, northeastern Brazil. Sixty 10 × 10 m sampling plots were installed to cover different environments within the fragment. The relationship between environmental variables and species composition was evaluated by means of a generalized linear mixed model. The... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Brejo de altitude; Community ecology; Epiphytism; Environmental factors; Forest fragmentation. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000200270 |
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| Rocha, Ronne-von Ribeiro da; Universidade Federal do Piauí; Oliveira, Petrônio Batista de; Universidade Federal do Piauí; Nunes, Amaury Guimarães; Universidade Federal do Piauí; Silva, Tairon Pannunzio Dias e; Universidade de São Paulo; Pereira, Alécio Matos; Universidade Federal do Piauí; Torreão, Jacira Neves da Costa; Colégio Técnico de Bom Jesus. |
| Current analysis evaluated adaptive parameters and thermal comfort of postpartum ewes fed on concentrate supplementation in grazing system. Thirty lactating pluriparous sheep, 16 Santa Inês (SI) and 14 Morada Nova (MN) were used. Physiological parameters such as respiratory rate (RR), heart rate (HR) and rectal temperature (RT) were measured, in that order, with the animals at rest in the morning (6:00-7:00 am) and in the afternoon (1:00-2:00 pm), respectively, every seven days, with 10 samples. A significant effect (p < 0.05) for RR and HR was reported in the strain. Similar behavior was reported for RR between the breeds where MN sheep had high adaptability. Supplementation levels of 0.5 and 1.5% influenced (p < 0.05) RR which was stronger... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental factors; Heat stress; Nutrition; Thermoregulation. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/22823 |
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| Ferrari, Isabella Ribeiro; Alcalde, Claudete Regina; Gomes, Ludmila Couto; Molina, Bruna Susan de Labio; Barbosa, Orlando Rus; Santos, Sérgio Mangano de Almeida. |
| This study aimed to evaluate the effect of the addition of calcium salts of long chain fatty acids (CSFA) on the intake and digestibility of diets. Twenty-five female goat kids housed in digestibility cages and subjected to heat stress of 32°C in a climatic chamber, were used. The female kids were distributed in a randomized block design with five treatments: control (without inclusion of CSFA) and 6.25; 12.50; 18.75 and 25.00 g CSFA kg-1 of DM. The inclusion of CSFA in rations did not influence water intake (3.08 L day-1), dry matter (0.66 kg day-1), organic matter (0.62 kg day-1), crude protein (0.12 kg day-1), neutral detergent fiber (0.27 kg day-1) and total carbohydrate (0.47 kg day-1). The results of the digestibility of dry matter (0.66 kg kg-1),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.04.03.00-1 goats; Environmental factors; Water intake; Protected fat.. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/29910 |
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| Registros recuperados: 157 | |
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