Results 21 to 30 of about 50,390 (204)

Effects of El Niño on the dynamics of Lake Alchichica, central Mexico

Geofísica Internacional, 2003
Se presenta evidencia empírica que muestra los efectos contemporáneos del fenómeno El Niño Oscilación del Sur sobre Alchichica, un lago profundo, monomíctico cálido.
Javier Alcocer, Alfonso Lugo
doaj   +1 more source

Phytoplankton Composition and Dynamics at A Tropical Tidal Creek, Lagos. [PDF]

Egyptian Academic Journal of Biological Sciences, B. Zoology, 2018
The diversity and dynamics of phytoplankton at a tropical tidal creek in Lagos, in relation to water chemistry changes, were investigated for twenty-four months. Water samples were collected with a 75cl plastic bottle whereas phytoplankton samples were collected by a 55 µm mesh size standard plankton net towed horizontally  for 5 mins at
openaire   +1 more source

Serum calcium and its relationship with immunoglobulin G (IgG) levels in prepartum buffaloes from the Venezuelan humid tropics

Revista Científica, 2023
The immune system partially recognizes specific antigens due to the role of calcium (Ca2+) as an intracellular second messenger that regulates the humoral immune response.
Juan Pablo Uzcátegui-Varela, Anacelmira Urbina Andueza, Janeth Caamaño Carrero   +2 more
doaj   +1 more source

DISTRIBUCIÓN VERTICAL DE LA DIVERSIDAD BETA DE MACROINVERTEBRADOS EN UN LAGO OLIGOTRÓFICO DE ALTA MONTAÑA NEOTROPICAL

Acta Biológica Colombiana, 2023
Los componentes alfa (α) y beta (β) de la diversidad gamma (γ), y la partición de β en anidamiento y recambio, contribuyen a entender los factores que determinan la diversidad biológica.
Yimy Herrera-Martínez, Mabel Giovana Pimiento-Ortega, Narcís Prat, Nayibe Yanine Castiblanco Rodríguez, Yesica Lorena González Martínez   +4 more
doaj   +1 more source

Estimation of growth parameters for the exploited sea cucumber Holothuria arguinensis from South Portugal [PDF]

, 2018
Understanding how species grow is critical for choosing appropriate fisheries management strategies. Sea cucumbers shrink during periods of aestivation and have naturally flaccid bodies that make measuring growth difficult.
Erzini, Karim, Gonzalez-Wanguemert, Mercedes, Olaya-Restrepo, Julian   +2 more
core   +1 more source

Spatial and temporal variation of Peridinium umbonatum F. Stein, 1883 (Dinophyceae) and its relationship with total phytoplankton of a shallow, oligotrophic lake in central Brazil (Lagoon Bonita, Distrito Federal) Variação especial e temporal de Peridinium umbonatum F. Stein, 1883 (Dinophyceae) e sua relação com o fitoplâncton total de uma lagoa rasa e oligotrófica no Brasil Central (Lagoa Bonita, Distrito Federal)

Acta Limnologica Brasiliensia, 2010
AIM: The main goal of this study was to investigate the temporal and spatial distribution of Peridinium umbonatum and its relationship with the physical and chemical water variables of the pelagic and littoral zones of Lagoon Bonita, located in Brasília,
Patrícia Pereira Gomes, Maria do Socorro Rodrigues Ibañez, June Springer de Freitas   +2 more
doaj   +1 more source

Lago Chad: qué se esconde tras la crisis de sus aguas

Relaciones Internacionales, 2020
El lago Chad es un oasis en medio del desierto. Se trata de un lago tropical cuya cuenca activa se alimenta principalmente de las aguas del río Chari y de su afluente el río Logone. Cerca de cien millones de habitantes viven de sus aguas.
Silvia Alejandra Perazzo
doaj   +1 more source

Long-Term Vegetation Dynamics in a Megadiverse Hotspot: The Ice-Age Record of a Pre-montane Forest of Central Ecuador. [PDF]

, 2018
Tropical ecosystems play a key role in many aspects of Earth system dynamics currently of global concern, including carbon sequestration and biodiversity.
Absy, Alley, Aspden, Bennett, Bernal, Bernal, Blaauw, Bush, Bush, Bush, Bush, Bush, Bush, Bush, Bush, Clark, Colinvaux, Colinvaux, Colinvaux, Colinvaux, Coplen, Correa-Metrio, Cox, Cárdenas, Cárdenas, Cárdenas, Davis, de Berc, Deplazes, Faegri, Ferdon, Finsinger, Flantua, Flantua, Gentry, Gosling, Haberle, Haffer, Hall, Harling, Haug, Heine, Hijmans, Hill, Hogg, Jacobson, Juggins, Jørgensen, Keen, Liu, Livingstone, Lombardo, Lombardo, Loughlin, Luzuriaga, Malhi, Matthews-Bird, Meyers, Mosblech, Myers, Oksanen, Puyasena, Roubik, Rull, Sierra, Stocker, Stockmarr, Urrego, Urrego, van der Hammen, van’t Veer, Von Post, Whitlock, Whitney, Whittaker, Williams   +75 more
core   +9 more sources

Influence of seston quantity and quality on growth of tropical cladocerans Influência da quantidade e qualidade do séston sobre o crescimento de cladóceros tropicais

Brazilian Journal of Biology, 2005
The seston of the small, shallow, and tropical lake Monte Alegre was tested for quantity and quality for cladocerans by growth bioassays, which were carried out in spring (Daphnia gessneri and Moina micrura), summer (D. gessneri, M. micrura, Ceriodaphnia
A. S Ferão-Filho, M. S. Arcifa, C. Fileto   +2 more
doaj   +1 more source

Sporormiella as a tool for detecting the presence of large herbivores in the Neotropics [PDF]

, 2016
The reliability of using the abundance of Sporormiella spores as a proxy for the presence and abundance of megaherbivores was tested in southern Brazil. Mud-water interface samples from nine lakes, in which cattle-use was categorized as high, medium, or ...
ABSY ML, Alexandra M. Folcik, APTROOT A, AUGUSTINE DJ, BAKER AG, BAKKER ES, BARNOSKY AD, BORRERO LA, BURNEY DA, COLINVAUX P.A., COLINVAUX PA, COLINVAUX PA, Crystal H. McMichael, DAVIS OK, DAVIS OK, DAVIS OK, DOUGHTY CE, ETIENNE D, FAEGRI K, FROYD CA, GELMAN A, GILL JL, GILL JL, GILL JL, GILL JL, GOODLAND R, GRAYSON DK, JOHNSON CN, JOHNSON CN, JOHNSON CN, LEDRU M.-P, LEDRU ML, MACFADDEN BJ, MACPHEE RDE, Marco Felipe Raczka, Mark B. Bush, MARTIN PS, MARTIN PS, MARTIN PS, MCNAUGHTON SJ, MILLER GH, MORELLATO LPC, PARKER NE, RAPER D, RAUP D.M, RAUP DM, RIPPLE W.J, ROBINSON GS, SMITH FA, STOCKMARR J, VAN GEEL B, WEBB SD, WOOD JR   +52 more
core   +3 more sources