Results 31 to 40 of about 29,608 (209)

Amplified bioproductivity during Transition IV (332 000–342 000 yr ago): evidence from the geochemical record of Lake El'gygytgyn [PDF]

, 2013
To date, terrestrial archives of long-term climatic change within the Arctic have widely been restricted to ice cores from Greenland and, more recently, sediments from Lake El'gygytgyn in northeast Arctic Russia.
N. Nowaczyk, L. Cunningham, H. Vogel, Rosen, P., Juschus, O., Vogel, H., Cunningham, Laura, Cunningham, L., Cunningham, L.,, Nowaczyk, N., Rosen, Peter,, Wennrich, V., P. Rosén, O. Juschus, Vogel, Hendrik, V. Wennrich   +15 more
core   +1 more source

Limnological changes in Dom Helvécio Lake (South-East Brazil): natural and anthropogenic causes

Brazilian Journal of Biology
In order to verify changes in physical, chemical and biological features of Dom Helvécio Lake (South-East Brazil), this study compares previous and recent data obtained from limnological investigations over three decades. Plankton species composition and
PM. Maia-Barbosa, LG. Barbosa, SL. Brito, F. Garcia, CFA Barros, MBG Souza, N. Mello, AS. Guimarães, FAR Barbosa   +8 more
doaj   +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

The Lake Petén Itzá Scientifi c Drilling Project [PDF]

Scientific Drilling, 2006
Polar ice cores provide us with high-resolution records of past climate change at high latitudes on both glacial-to-interglacial and millennial timescales.
Daniel Ariztegui, Mark Brenner, Flavio S. Anselmetti, David A. Hodell   +3 more
doaj   +1 more source

Diurnal sampling reveals significant variation in CO2 emission from a tropical productive lake

Brazilian Journal of Biology
It is well accepted in the literature that lakes are generally net heterotrophic and supersaturated with CO2 because they receive allochthonous carbon inputs. However, autotrophy and CO2undersaturation may happen for at least part of the time, especially
PCJ Reis, FAR Barbosa
doaj   +1 more source

Profundal benthic invertebrates in an oligotrophic tropical lake: different strategies for coping with anoxia

Journal of Limnology, 2014
The deep benthic communities of tropical lakes are poorly understood with respect to their composition, abundance, biomass and regulatory factors. Whereas the hypolimnia of temperate oligotrophic lakes remain oxygenated, the higher temperatures in ...
María del Carmen Hernández, Javier Alcocer, Luis A. Oseguera, Elva Escobar   +3 more
doaj   +1 more source

Stable Isotopes Approach to Infer the Feeding Habit and Trophic Position of Freshwater Fishes in Tropical Lakes [PDF]

Iranica Journal of Energy and Environment, 2016
A study was conducted on the stable isotope variation of muscle tissues from selected freshwater fish species from Temenggor Lake and Chenderoh Lake, Perak, Malaysia from December 2014 to March 2015. The objective is to assess the stable isotopes of δ13C
S. K. Yap, I. Muneera, M. I. Syakir, H. H. Zarul, F. Widad   +4 more
doaj   +1 more source

Nitrogen transformation pathways, rates, and isotopic signatures in Lake Lugano [PDF]

, 2014
The consequences of detrimental alterations caused to the natural nitrogen (N) cycle are manifold. To tackle problems, such as eutrophication of coastal marine and lacustrine environments, or increasing emissions of greenhouse gas nitrous oxide (N2O ...
Wenk, Christine B.
core   +1 more source

Effects of turbidity and introduced tilapia (Oreochromis spp) on macrophytes and invertebrates in a shallow tropical lake

Knowledge and Management of Aquatic Ecosystems, 2023
Tropical freshwater wetlands are subject to multiple stressors but there is little information on which stressors cause wetland degradation. Increased turbidity is considered a major cause of degradation, but the effects of introduced fish are often ...
Rasoamihaingo Laurence Adel, Razafindrajao Felix, Andriambelo Harison, Rene de Roland Lily Arison, Bamford Andrew J.   +4 more
doaj   +1 more source

The fishes of Lake Kununurra, a highly regulated section of the Ord River in northern Western Australia

, 2006
The Ord River, situated in the east Kimberley region of Western Australia, is regulated by two darns that supply irrigation water for tropical agriculture. The regulation of water in the 55 km span of river between these dams has resulted in this section
Doupe, R G, Rowland, A J, Doupé, R.G., Rowland, A.J., Morgan, D.L., Morgan, D L, Gill, H. S., Gill, Howard S, Gill, H.S.   +8 more
core   +1 more source