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| Registros recuperados: 10 | |
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| Brasil,Leandro S.; Shimano,Yulie; Batista,Joana Darc; Cabette,Helena S. R.. |
| We analyzed the effects of environmental factors on abundance, species richness, and functional group richness of Leptophlebiidae in 16 sampling points along four Cerrado streams. Across three periods of 2005, we collected 5,492 larvae from 14 species in stream bed substrate. These species belong to three functional feeding groups: scrapers, filtering collectors and shredders. The abundance and species richness were not affected by water quality, but habitat quality related to presence of riparian vegetation had positive effects on the abundance of shredders. Our results add important information on the natural history of the species and functional groups of aquatic insects and also provide relevant data for the monitoring and conservation of streams in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquatic insects; Functional feeding groups; Environmental changes. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212013000300008 |
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| Soares,Paula Fernanda Chaves; Anjos,Lúcia Helena Cunha dos; Pereira,Marcos Gervasio; Pessenda,Luiz Carlos Ruiz. |
| ABSTRACT: Highland environments favor accumulation and preservation of soil organic matter (SOM) due to low temperatures, leading to the formation of Histosols. The Itatiaia National Park (INP), Rio de Janeiro, Brazil, offers conditions for preservation of SOM deposited over time, which has led to the formation of these soils. The objective of this study was to characterize Histosols in this environment, with the premise that it may provide evidence of changes in vegetation. Organossolos (Histosols) were sampled, characterized, described, and analyzed for their properties, stable isotopes of 12C and 13 14 15 14 C, N and N, and dating of organic matter through C. The soils were classified in the Brazilian Soil Classification System as Organossolo Háplico... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peat lands; Itatiaia National Park; Environmental changes. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100315 |
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| Harff, Jan; Flemming, Nicholas C; Groh, Andreas; Hunicke, Birgit; Lericolais, Gilles; Meschede, Martin; Rosentau, Alar; Sakellariou, Dimitris; Uscinowicz, Szymon; Zhang, Wenyan; Zorita, Eduardo. |
| This chapter gives an overview of the environmental changes to the European shelf and its marginal seas during the Late Pleistocene to the Middle Holocene. It first explains the regional tectonics of Europe. The age of the consolidation of the basement together with the plate tectonic setting serves as the main parameters determining coastal formation. Next, the chapter reviews the fluctuation of glacial and interglacial stadia as an effect of orbital parameters of the Earth around the Sun. In addition, it examines eustatic change during the Last Glacial Cycle (LGC). The chapter also describes the development of the Baltic Sea, the North Sea and the Atlantic shelf, based on numerical sea-level scenarios constrained by observational data. Finally, it... |
| Tipo: Text |
Palavras-chave: Baltic Sea; Climate change; Coastal formation; Environmental changes; European continental shelf; Eustatic change; Late Pleistocene; Middle Holocene; Sea level. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00391/50263/51051.pdf |
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| Carvalho,Thaís B.; Mendonça,Francine Z.; Costa-Ferreira,Roselene S.; Gonçalves-de-Freitas,Eliane. |
| Animals show behavioral and physiological changes that emerge in response to environmental perturbations (i.e., emergency life-history stages). In this study, we investigate the effects of light intensity on aggressive encounters and social stability in groups of adult male Nile tilapia, Oreochromis niloticus (Linnaeus, 1758). The study compared the behavior observed under low (280.75 ± 50.60 lx) and high (1394.14 ± 520.32 lx) light intensities, with 12 replicates for each treatment. Adult fish were isolated in 36-L aquaria for 96 hours, and three males were grouped for 11 days in 140-L aquaria. Agonistic behavior was video-recorded (10 min/day) on the 3rd, 5th, 7th, and 9th day to quantify aggressive interactions and social stability. There was an effect... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggressiveness; Aquaculture; Environmental changes; Social rank. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200001 |
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| AMADEU SANTANA,Ana Rute; WERTH,Martin; BENEDITO-CECILIO,Evanilde. |
| The present review investigated the sources of energy for detritivorous fish species in floodplains. Recent studies have shown that environmental changes that alter the terrestrial vegetation affect essentially the resource base in these areas, such as the detritus. In aquatic environments, especially floodplains, a major part of metabolic processes is supported by terrestrial detritus, which accounts for maintaining the detritivorous food chain. Thus, one way to evaluate environments changes is through isotopic studies of organic matter, which allows acquiring information about the quantity and quality of organic matter. This approach is required for understanding the interactions between the organic matter dynamics and its ecological effects, allowing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental changes; Detritus; Microbial biomass; Stable isotopes. |
| Ano: 2015 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000100001 |
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| Registros recuperados: 10 | |
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