Seasonal dynamics of bird assemblages in commercial plantations of Pinus radiata in southern-central Chile

Abstract Forest plantations are a relatively new environment in Chile, with impacts of different magnitude on different taxa. Birds are one of the taxa mostly used as ecological indicators to evaluate the effect of different types of disturbances, due to their level of specialization in the use of different microhabitats. We assessed the effect of the age of Pinus radiata plantations (2 sites of 8 and 12 years, respectively) and seasonal (three seasons) on the diversity of bird assemblages. The abundance of species from both sites was assessed through acoustic and visual survey records, which were also compared at trophic guild level. Differences were observed at both sites, with higher diversity calculated for Cerro Ñielol (8 years) compared to Rucamanque (12 years). In seasonal terms, diversity was not affected in Cerro Ñielol, while in Rucamanque significant differences were observed during fall. Guild composition of both localities also showed differences, resulting in higher diversity for Cerro Ñielol in most cases. Despite the fact that the younger plantation presented the highest diversity, elements associated with the landscape are discussed, as well as particularities in the use of space by the species.

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The late Paleozoic paired metamorphic belt of southern Central Chile: Consequence of a near-trench thermal anomaly?

10.31223/x58s4b ◽

2021 ◽

Author(s):

Guido Gianni

Keyword(s):

Thermal Anomaly ◽

Accretionary Prism ◽

Late Paleozoic ◽

Metamorphic Belt ◽

Central Chile ◽

Geodynamic Process ◽

Mid Ocean Ridge ◽

Southern Central ◽

Geological Units ◽

Ocean Ridge

The hypothesis of a subduction-related Miyashiro-type paired metamorphic belt for the origin of the late Paleozoic igneous and metamorphic complex in the Andean Coastal Cordillera has remained unquestioned since its proposal in the early seventies. A synthesis of the advances in the study of these metamorphic rocks between 33°S and 42°S, revising field relations among geological units, and geochemical and geochronological data from the contemporaneous granitoids of the Coastal Batholith, highlights inconsistencies in this model. The record of short-lived forearc magmatism in the late Paleozoic intruding the partially synchronous accretionary prism, and geochemical and isotopic data from the igneous rocks indicating sources from the accretionary prism sediments and the back-top lithosphere, suggest a departure from typical subduction settings. I conclude that the anomalous configuration of the paired metamorphic belt and the associated Coastal Batholith resulted from a complex geodynamic process involving a near-trench thermal anomaly caused by the subduction of a trench parallel mid-ocean ridge.

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WEAP21 based modelling under climate change considerations for a semi-arid region in southern-central Chile

MASKANA ◽

10.18537/mskn.08.02.10 ◽

2017 ◽

Vol 8 (2) ◽

pp. 125-146 ◽

Cited By ~ 1

Author(s):

Luis Duque ◽

Raúl Vázquez

Keyword(s):

Climate Change ◽

Arid Region ◽

Central Chile ◽

Southern Central ◽

Semi Arid Region ◽

Semi Arid

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Hiking trails as conduits for the spread of non-native species in mountain areas

Biological Invasions ◽

10.1007/s10530-019-02165-9 ◽

2019 ◽

Vol 22 (3) ◽

pp. 1121-1134 ◽

Cited By ~ 2

Author(s):

Rebecca Liedtke ◽

Agustina Barros ◽

Franz Essl ◽

Jonas J. Lembrechts ◽

Ronja E. M. Wedegärtner ◽

...

Keyword(s):

Native Species ◽

Control Plant ◽

Plant Invasions ◽

Native Plant ◽

Mountain Areas ◽

Central Chile ◽

Hiking Trails ◽

Local Plant ◽

Southern Central ◽

Recreational Use

AbstractRoadsides are major pathways of plant invasions in mountain regions. However, the increasing importance of tourism may also turn hiking trails into conduits of non-native plant spread to remote mountain landscapes. Here, we evaluated the importance of such trails for plant invasion in five protected mountain areas of southern central Chile. We therefore sampled native and non-native species along 17 trails and in the adjacent undisturbed vegetation. We analyzed whether the number and cover of non-native species in local plant assemblages is related to distance to trail and a number of additional variables that characterize the abiotic and biotic environment as well as the usage of the trail. We found that non-native species at higher elevations are a subset of the lowland source pool and that their number and cover decreases with increasing elevation and with distance to trails, although this latter variable only explained 4–8% of the variation in the data. In addition, non-native richness and cover were positively correlated with signs of livestock presence but negatively with the presence of intact forest vegetation. These results suggest that, at least in the region studied, hiking trails have indeed fostered non-native species spread to higher elevations, although less efficiently than roadsides. As a corollary, appropriate planning and management of trails could become increasingly important to control plant invasions into mountains in a world which is warming and where visitation and recreational use of mountainous areas is expected to increase.

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FORMATION OF POST-FIRE WATER-REPELLENT LAYERS IN MONTERREY PINE (pinus radiata D. DON) PLANTATIONS IN SOUTH-CENTRAL CHILE

Journal of soil science and plant nutrition ◽

10.4067/s0718-95162010000200001 ◽

2010 ◽

Vol 10 (4) ◽

pp. 399-406 ◽

Cited By ~ 7

Author(s):

P Garcia-Chevesich ◽

R Pizarro ◽

C.L Stropki ◽

P Ramirez de Arellano ◽

P.F Ffolliott ◽

...

Keyword(s):

Pinus Radiata ◽

Water Repellent ◽

Central Chile ◽

South Central

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The Chile Biliary Longitudinal Study: A Gallstone Cohort

American Journal of Epidemiology ◽

10.1093/aje/kwaa199 ◽

2020 ◽

Author(s):

Jill Koshiol ◽

Vanessa Van De Wyngard ◽

Emma E McGee ◽

Paz Cook ◽

Ruth M Pfeiffer ◽

...

Keyword(s):

Longitudinal Study ◽

Blood Cells ◽

Blood Clot ◽

Buffy Coat ◽

Central Chile ◽

Southern Central ◽

Risk Areas ◽

Detection Strategies ◽

Primary Risk Factor

Abstract Gallbladder cancer (GBC) is a highly fatal cancer that can be cured through cholecystectomy if identified early. The presence of gallstones is the primary risk factor for GBC, but few people with gallstones develop GBC. A key question is what drives the development of GBC among persons with gallstones. We initiated the Chile Biliary Longitudinal Study (Chile BiLS) to address this question. From 2016 to 2019, Chile BiLS enrolled 4,726 women aged 50–74 years with ultrasound-detected gallstones from southern-central Chile, accounting for an estimated 36% of eligible women with gallstones in the study area. The median age was 59 years; 25% of the women were Amerindian (Mapuche), 60% were obese, 25% had diabetes, and 6% had cardiovascular disease. Participants will be followed for gallbladder dysplasia or cancer for 6 years. As of April 30, 2020, over 91% of those eligible completed the year 2 follow-up visit. Data being collected include epidemiologic and sociodemographic information, anthropometric measurements, blood pressure, and tooth counts. Biosamples being taken include baseline plasma, buffy coat, red blood cells, serum, blood clot from serum, and PAXgene whole blood (PreAnalytiX GmbH, Hombrechtikon, Switzerland). Complete gallbladder sampling is conducted for most participants undergoing cholecystectomy. The Chile BiLS cohort study will increase our understanding of GBC etiology and could identify potential risk stratification and early detection strategies in high-risk areas.

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Effects of Human Activity on the Structure of Coastal Marine Bird Assemblages in Central Chile

Conservation Biology ◽

10.1111/j.1523-1739.2001.00163.x ◽

2008 ◽

Vol 15 (5) ◽

pp. 1396-1404 ◽

Cited By ~ 2

Author(s):

Cintia Cornelius ◽

Sergio A. Navarrete ◽

Pablo A. Marquet

Keyword(s):

Human Activity ◽

Central Chile ◽

Marine Bird ◽

Bird Assemblages ◽

Coastal Marine

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Contribution of Advanced Regeneration of Pinus radiata D. Don. to Transpiration by a Fragment of Native Forest in Central Chile Is out of Proportion with the Contribution to Sapwood Area

Forests ◽

10.3390/f11020187 ◽

2020 ◽

Vol 11 (2) ◽

pp. 187

Author(s):

Don A. White ◽

Richard P. Silberstein ◽

Francisco Balocchi-Contreras ◽

Juan Jose Quiroga ◽

Pablo Ramírez de Arellano

Keyword(s):

Climate Change ◽

Leaf Area ◽

Flux Density ◽

Pinus Radiata ◽

Native Forest ◽

Sap Flux ◽

Sap Flux Density ◽

Sapwood Area ◽

Central Chile ◽

Potential Index

The transpiration of Nothofagus glauca (Phil.) Krasser and advanced Pinus radiata D. Don. regeneration was measured in a fragment of native N. glauca forest. Over the eight months of this study, P. radiata contributed approximately 60% of the total stand transpiration. This was out of proportion with the approximately 34% of the stand sapwood area contributed by P. radiata. This was due to the significantly greater sap flux density of the P. radiata compared to the N. glauca between May and October. Though the results are from a small study conducted as part of a larger experiment, it is argued that they suggest that invasion by P. radiata may substantially increase the risk from climate change to reserves of N. glauca forest in the Maule region of central Chile. In some reserves of N. glauca forest, Forestal Arauco S.A. manually removed P. radiata that regenerated after the wildfire of January 2017. This was a costly operation and there is a need for indices to assess competition. The ratio of sapwood area to leaf area is suggested as a potential index for assessing competition to identify stands at risk.

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