Diel Variations
Mostrando 1-8 de 8 artigos, teses e dissertações.
-
1. Diel Variations and Ecological Aspects in Fish Assemblages of a Sandy Beach in the Semi-Arid Region of Northeast Brazil.
ABSTRACT For the demersal fish that inhabit sandy beaches, the variation between day and night periods represents a determinant factor in their behavior, especially for species that live in shallow waters. This research aims at determining whether there are differences in the fish assemblage structure of the sandy beach of São Cristóvão, RN, Brazil, betwe
Braz. arch. biol. technol.. Publicado em: 31/10/2016
-
2. Reproductive ecology of two species of Leptodactylus and the evolution of morphological, behavioural and ecological characters in the L. pentadactylus species group (Anura, Leptodactylidae) / Ecologia reprodutiva de duas espécies de Leptodactylus e a evolução de caracteres morfológicos, comportamentais e ecológicos no grupo de L. pentadactylus (Anura, Leptodactylidae)
Historical Ecology unifies concepts in ecology, behavior and phylogeny. To determine the evolutionary context of reproductive characters within the Leptodactylus pentadactylus species group and also to explore questions such as predation and habitat selection, I described the reproductive ecology of two key species, L. labyrinthicus and L. syphax) (Anura, Le
Publicado em: 2009
-
3. Spatial and temporal (seasonal, diel and per hour) in fish assemblages from two sandy beaches with different degree of expousure to waves in Municipality of Rio de Janeiro, Brazil. / Variações espaciais e temporais (sazonais, diurnais e por horário) nas assembléias de peixes em duas praias arenosas com diferentes graus de exposição às ondas do Município do Rio de Janeiro, Brasil.
Variações espaciais e temporais (sazonais, diurnais e por horário) na composição e estrutura das assembléias de peixes das praias do Flamengo (2255S e 4310W - protegida) e de Grumari (2303 S e 4332W - exposta) foram descritas com base em 384 arrastos realizados trimestralmente ao longo de ciclos de quarenta e oito horas para coleta de peixes e tomada d
Publicado em: 2008
-
4. A comunidade fital : variação espacial e nictemeral da epifauna, especialmente anfipodos, associada a alga parda Sargassum spp. em quatro praias de Ubatuba, litoral norte do Estado de São Paulo
Diel variations and spatial differences in the species composition of the epifaunal community of the brown algae Sargassum were investigated within and among four shores, respectively ? Domingas Dias, Lázaro, Lamberto e Perequê-mirim - of the north coast of São Paulo state, Brazil. It?s supposed that patterns of diel movements of the populations of epifau
Publicado em: 2004
-
5. Diel Interactions of Oxygenic Photosynthesis and N2 Fixation (Acetylene Reduction) in a Marine Microbial Mat Community
Diel variations in N2 fixation (acetylene reduction), CO2 fixation, and oxygen concentrations were measured, on three separate occasions, in a marine microbial mat located on Shackleford Banks, North Carolina. Nitrogenase activity (NA) was found to be inversely correlated with CO2 fixation and, in two of the three diel periods studied, was higher at night th
-
6. Carbon Partitioning in Eelgrass (Regulation by Photosynthesis and the Response to Daily Light-Dark Cycles).
Diel variations in rates of C export, sucrose-phosphate synthase (SPS) and sucrose synthase (SS) activity, and C reserves were investigated in Zostera marina L. (eelgrass) to elucidate the environmental regulation of sucrose formation and partitioning in this ecologically important species. Rates of C flux and SPS activity increased with leaf age, consistent
-
7. Temporal Variation of Denitrification Activity in Plant-Covered, Littoral Sediment from Lake Hampen, Denmark
Diel and seasonal variations in denitrification were determined in a littoral lake sediment colonized by the perennial macrophyte Littorella uniflora (L.) Aschers. In the winter, the activity was low (5 μmol of N m−2 h−1) and was restricted to the uppermost debris layer at a depth of 0 to 1 cm. By midsummer, the activity increased to 50 μmol of N m−2
-
8. Measurement of rRNA Variations in Natural Communities of Microorganisms on the Southeastern U.S. Continental Shelf †
The development of a clear understanding of the physiology of marine prokaryotes is complicated by the difficulties inherent in resolving the activity of various components of natural microbial communities. Application of appropriate molecular biological techniques offers a means of overcoming some of these problems. In this regard, we have used direct probi