scholarly journals Selective consumption of rodents by the Variable hawk Geranoaetus polyosoma (Accipitriformes: Accipitridae) in the Atacama Desert, northern Chile

2020 ◽  
Vol 37 ◽  
pp. 1-6
Author(s):  
Andrés Muñoz-Pedreros ◽  
Heraldo Norambuena ◽  
Claudia Gil ◽  
Jaime Rau
Keyword(s):  
South America ◽  
Trophic Ecology ◽  
Rattus Rattus ◽  
Atacama Desert ◽  
Rodent Species ◽  
Large Prey ◽  
Northern Chile ◽  
Desert Zone ◽  
Introduced Rodent ◽  
Prey Items

Geranoaetus polyosoma (Quoy & Gaimard, 1824) is a diurnal raptor widely distributed in South America. Although the trophic ecology of this bird has been more studied in the southern extreme of its range, little information is available on its dietary response to prey supply in desert environments. In the present study, we report on the trophic ecology of G. polyosoma in a sub-urban desert zone in northern Chile, with the following objectives: (1) to quantitatively describe its diet and (2) to determine its dietary selectivity in response to prey supply in the study area. The diet of G. polyosoma consisted mainly of rodents (97.2%). A greater preference (p < 0.05) was observed for the following large prey items (> 19.5 g): two native rodent species, Phyllotis xanthopygus (Waterhouse, 1837) and Eligmodontia puerulus (Philippi, 1896); and two introduced rodent species: Rattus rattus (Linnaeus, 1769) and R. norvegicus (Berkenhout, 1769).

scholarly journals A comparison of foraging between the South American and Cabot's Tern in southern Brazil

2011 ◽  
Vol 11 (3) ◽  
pp. 189-196 ◽  
Author(s):  
Hélio Augusto Alves Fracasso ◽  
Joaquim Olinto Branco ◽  
Edison Barbieri
Keyword(s):  
South America ◽  
Trophic Ecology ◽  
South American ◽  
Southern Brazil ◽  
The South ◽  
Santa Catarina ◽  
Late Afternoon ◽  
Large Populations ◽  
Breeding Seasons ◽  
Prey Items

Despite being widely distributed in South America and having relatively large populations, little is known about the trophic ecology of the South American Tern (Sterna hirundinacea) and Cabot's Tern (Thalasseus acuflavidus). In Brazil, South American and Terns Cabot's breed in mixed colonies from the state of Espírito Santo to Santa Catarina. Here, we describe results of a study of the feeding ecology of these two species during the reproductive seasons of April to October of 2003, 2005 and 2006 from Cardos Island, Santa Catarina, Brazil. A total of 6248, 5140, and 4006 fishes were delivered to chicks or females by South American Terns; and 1157, 628 and 98 fish and or other prey items by Cabot's Terns during the breeding seasons of 2003, 2005, and 2006, respectively. Prey items identified included eight, seven and nine fish families for South American Terns; and, five, three and two families for Cabot's terns, in the three respective years. The number of food deliveries per chick for South American Terns was between 09:00 and 10:00 am in 2006, and between 11:00 and 12:00 am in 2005. Cabot's Terns chicks were fed in the early hours of the morning until late afternoon.

scholarly journals A new titanosaur sauropod from the Atacama Desert, Chile

2011 ◽  
Vol 83 (1) ◽  
pp. 211-219 ◽  
Author(s):  
Alexander W.A. Kellner ◽  
David Rubilar-Rogers ◽  
Alexander Vargas ◽  
Mario Suárez
Keyword(s):  
New Species ◽  
South America ◽  
Upper Cretaceous ◽  
Atacama Desert ◽  
Northern Chile ◽  
Red Sandstone ◽  
Caudal Vertebrae ◽  
The Pacific ◽  
Pacific Margin ◽  
A New Species

Partial remains of a titanosaur sauropod collected in the Tolar Formation (Upper Cretaceous) at the Atacama Desert (Antofagasta Region), northern Chile, is described, and a new species, Atacamatitan chilensis gen. et sp. nov., is erected. The material consists mainly of dorsal and caudal vertebrae, part of a humerus and a femur. The presence of a titanosaur confirms the Cretaceous age for the outcrops of red sandstone of the Tolar Formation whose age was previously uncertain, ranging from the Upper Cretaceous to the Paleocene. The new specimen represents the most complete dinosaur reported for this region and one of the most complete titanosaur known from Chile and the pacific margin of South America so far.

CONFOUNDINGLY COMPLEX EXPOSURE HISTORIES REVEALED BY 21NE AND 10BE ABUNDANCES IN ALLUVIAL DEPOSITS OF THE ATACAMA DESERT, NORTHERN CHILE

2017 ◽  
Author(s):  
Matthew Cross Jungers ◽  
◽  
Arjun M. Heimsath ◽  
Ronald Amundson ◽  
Greg Balco ◽  
...  
Keyword(s):  
Atacama Desert ◽  
Northern Chile ◽  
Alluvial Deposits

Potential of arsenic bioremediation by a cyanobacterium isolated from the Salado River in the Atacama Desert

2021 ◽  
Vol 43 (2) ◽  
pp. 156-160
Author(s):  
Pablo Pérez-Portilla ◽  
Juan Araya ◽  
Karem Gallardo ◽  
Adriana Aránguiz-Acuña
Keyword(s):  
Atacama Desert ◽  
Aquatic Systems ◽  
Arid Environments ◽  
Northern Chile ◽  
Evolutionary Mechanisms ◽  
Alkaline Conditions ◽  
Ph Conditions ◽  
Removal Of Arsenic ◽  
Salado River ◽  
Over Time

Abstract Cyanobacteria and microalgae are recognized as excellent metal(loid)s-bioremediators of aquatic systems. We isolated a cyanobacterium from the Salado River in the Atacama Desert, northern Chile, which was identified as Cyanobium sp. Growth inhibition bioassays were conducted with arsenic and cadmium, and tolerance of Cyanobium to these metals was estimated. Removal of arsenic was assessed under different pH conditions and over time. We showed that the Cyanobium strain isolated from the Salado River has a greater tolerance to the arsenic and cadmium compounds than other species commonly used in metal(loid)s-bioremediation. Removal of up to 90% of arsenic was obtained in alkaline conditions, within the first 3 hours of exposure suggesting that Cyanobium sp. isolated from the Atacama Desert could be further studied with biotechnological purposes and to understand the evolutionary mechanisms of adaption to arid environments.

The Paleoepidemiology of American Trypasonomiasis (Chagas disease)

1970 ◽  
Vol 80 (1) ◽  
Author(s):  
Wilmar Salo ◽  
William C. Auferheide ◽  
Michael Madden ◽  
John Streitz ◽  
Jane Buikstra ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Ancient Dna ◽  
Academic Discipline ◽  
Atacama Desert ◽  
Geographic Area ◽  
Northern Chile ◽  
Kinetoplast Dna ◽  
Testing Hypotheses ◽  
The Past ◽  
Tissue Specimens

Ancient DNA methodology was applied to extract and amplify a segment of kinetoplast DNA of Trypanosoma cruzi in soft tissue specimens from about 300 spontaneously mummified human bodies from the Atacama Desert in northern Chile and southern Peru. A DNA probe was then employed to hybridize with the amplicon. Results indicate that about 41% of the population in that geographic area were infected with the trypanosome over the past 9000 years. The epidemiological implications of these findings are discussed. It is also emphasized that this and several other paleoepidemiological studies in progress have established that population-study cohorts of mummies now can generate statistically valid paleoepidemiological investigations capable of testing hypotheses. These reflect the maturation of the academic discipline of the scientific study of mummies.

scholarly journals Let's talk about stress, baby! Infant-feeding practices and stress in the ancient Atacama desert, Northern Chile

2018 ◽  
Vol 166 (1) ◽  
pp. 139-155 ◽  
Author(s):  
Charlotte L. King ◽  
Siân E. Halcrow ◽  
Andrew R. Millard ◽  
Darren R. Gröcke ◽  
Vivien G. Standen ◽  
...  
Keyword(s):  
Infant Feeding ◽  
Atacama Desert ◽  
Feeding Practices ◽  
Northern Chile ◽  
Infant Feeding Practices
Sign in / Sign up

Export Citation Format

Share Document