Results 21 to 30 of about 1,830,274 (183)

Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina [PDF]

open access: yesActa Palaeontologica Polonica, 2018
We report here two megaspores species related to the aquatic ferns of the Order Salviniales from the Late Cretaceous Mata Amarilla Formation (Austral Basin), southern Santa Cruz Province, Argentina.
Patricio E. Santamarina   +3 more
doaj   +1 more source

Sheep faeces decomposition and nutrient release across an environmental gradient in Southern Patagonia

open access: yesEcología Austral, 2017
In Southern Patagonia, most of the land ranging from the mountains to the sea in contrasting environmental conditions is devoted to extensive sheep farming. Existing estimations indicate that in ecosystems under livestock use, around 85% of the nitrogen
Héctor A. Bahamonde   +2 more
doaj   +1 more source

The Last Glacial Maximum and deglaciation in central Patagonia, 44°S–49°S

open access: yesCuadernos de Investigación Geográfica, 2017
This paper reviews published geochronological data on glacier fluctuations and environmental changes in central Patagonia (44° S - 49° S) from the Last Glacial Maximum (LGM) through to the Holocene.
M. Mendelova   +3 more
doaj   +1 more source

Otolith elemental composition reveals separate spawning areas of anchoveta, Engraulis ringens, off central Chile and northern Patagonia

open access: yesScientia Marina, 2019
The anchoveta (Engraulis ringens) is widely distributed throughout the Humboldt Current (4°30′-44°S). In recent years, its eggs and larvae have also been found inside fjords and channels of northern Patagonia, close to the southern limit of the central ...
María José Cuevas   +4 more
doaj   +1 more source

The lichen genera Gondwania and Transdrakea gen. nov. ( Teloschistaceae ) - speciation in three southern continents

open access: yesPlant and Fungal Systematics, 2023
Within the lichen family Teloschistaceae , a high number of genera are restricted to the extreme southern part of the Southern Hemisphere. The taxonomy and phylogeny of the southern genus Gondwania have been analyzed based upon fieldwork in Antarctica,
Ulrik Søchting   +2 more
doaj   +1 more source

Deep submarine infiltration of altered geothermal groundwater on the south Chilean Margin

open access: yesCommunications Earth & Environment, 2022
Freshening of porewater in marine sediments offshore the southern Chilean Margin is driven by submarine emplacement of fossil groundwater below Patagonia, according to elemental and isotopic analyses of sedimentary pore waters.
Vincent J. Clementi   +9 more
doaj   +1 more source

White-crested elaenias (Elaenia albiceps chilensis) breeding across Patagonia exhibit similar spatial and temporal movement patterns throughout the year.

open access: yesPLoS ONE
For migratory birds, events happening during any period of their annual cycle can have strong carry-over effects on the subsequent periods. The strength of carry-over effects between non-breeding and breeding grounds can be shaped by the degree of ...
Rocío Fernanda Jara   +2 more
doaj   +1 more source

Blooms of Alexandrium catenella in Coastal Waters of Chilean Patagonia: Is Subantarctic Surface Water Involved?

open access: yesFrontiers in Marine Science, 2021
At the southern tip of South America, evidence of shellfish toxicity has been recorded in the accounts of early explorers and shipwreck survivors since the late 16th Century.
David W. Crawford   +2 more
doaj   +1 more source

Sr ages for the Chenque Formation in the Comodoro Rivadavia region (Golfo San Jorge Basin, Argentina): Stratigraphic implications

open access: yesLatin American Journal of Sedimentology and Basin Analysis, 2021
The age and stratigraphic subdivisions for the late Oligocene-Miocene, marine deposits of Patagonia (Patagoniense succession) have been largely debated. Most studies for the Comodoro Rivadavia region were focused on its biostratigraphy and stratigraphic
José I. Cuitiño   +3 more
doaj   +2 more sources

Holocene History of Río Tranquilo Glacier, Monte San Lorenzo (47°S), Central Patagonia

open access: yesFrontiers in Earth Science, 2021
The causes underlying Holocene glacier fluctuations remain elusive, despite decades of research efforts. Cosmogenic nuclide dating has allowed systematic study and thus improved knowledge of glacier-climate dynamics during this time frame, in part by ...
Esteban A. Sagredo   +11 more
doaj   +1 more source

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