Gustavo Bizama - Academia.edu (original) (raw)

Papers by Gustavo Bizama

Research paper thumbnail of Matching global and regional distribution models of the recluse spider<i>Loxosceles rufescens</i>: to what extent do these reflect niche conservatism?

Medical and Veterinary Entomology, Jun 8, 2018

Research paper thumbnail of Dispersal processes and environmental extrapolation on predictive accuracy of species distribution models across time: an example with the endemic and threatened Darwin frog

F1000Research, Feb 28, 2016

Research paper thumbnail of Niche modelling of the Chilean recluse spider<i>Loxosceles laeta</i>and araneophagic spitting spider<i>Scytodes globula</i>and risk for loxoscelism in Chile

Medical and Veterinary Entomology, Jul 18, 2016

Research paper thumbnail of Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog

Ecological Applications, Jun 19, 2017

Research paper thumbnail of Invasión de Drosophila suzukii (Matsumura) en Chile: utilizando los modelos de distribución de especies como herramienta de bioseguridad

Revista chilena de entomología, Jan 31, 2020

Research paper thumbnail of Using Global and Regional Species Distribution Models (SDM) to Infer the Invasive Stage of<i>Latrodectus geometricus</i>(Araneae: Theridiidae) in the Americas

Environmental Entomology, Sep 17, 2016

Research paper thumbnail of Climate change can disproportionately reduce habitats of stream fishes with restricted ranges

Freshwater fishes are among the most threatened taxa worldwide due to changes in land use, specie... more Freshwater fishes are among the most threatened taxa worldwide due to changes in land use, species introductions, and climate change. Although more than half of the freshwater fishes in the Chilean Mediterranean ecoregion are considered vulnerable or endangered, still little is known about their biogeography. Fishes of the family Perciliidae are endemic of this region and ideal cases to study potential implications of global warming given their endangered conservation status, small size, restricted range, and limited dispersal capacity in fragmented habitats. Here, we model the spatial distribution of habitats for Percilia irwini and P. gillissi under current (1970-2000) and future (2050-2080) climatic scenarios (SSP245, SSP585). We implement maximum entropy (MaxEnt) models adapted for stream networks using high-resolution datasets of selected geophysical and climatic variables. At present, both species inhabit relatively low-quality habitats. In the future (SSP585), suitable habita...

Research paper thumbnail of Niche modelling of the Chilean recluse spiderLoxosceles laetaand araneophagic spitting spiderScytodes globulaand risk for loxoscelism in Chile

Medical and Veterinary Entomology, 2016

Research paper thumbnail of Spatio temporal population dynamics of the invasive diatom Didymosphenia geminata in central-southern Chilean rivers

The Science of the total environment, Jan 3, 2016

We document the distribution of Didymosphenia geminata in central-southern Chilean rivers and ide... more We document the distribution of Didymosphenia geminata in central-southern Chilean rivers and identify the chemical and physical factors associated with its presence/absence (p/a). Repeated surveys in five successive years provided evidence that D. geminata could be nearing a biogeographic equilibrium in the region. D. geminata databases from extensive biological and environmental surveys in 187 rivers, within ten catchments, south of 38°S commenced in November 2010 and ran through May 2013. In addition, data from two other field surveys were used. The sites evenly distributed latitudinally were climatically characterized. The recent sampling program, following a published species distribution model, was designed to explore D. geminata distribution within thirteen catchments (34°S-48°S). An extensive river survey in 2014 (spring-summer) and in 2015 (autumn) included the p/a, and relative abundance of D. geminata cells in phytobenthos and in the drift. These p/a results showed that t...

Research paper thumbnail of The Advocate - Sept. 10, 1964

Research paper thumbnail of Matching global and regional distribution models of the recluse spiderLoxosceles rufescens: to what extent do these reflect niche conservatism?

Medical and Veterinary Entomology, 2018

Research paper thumbnail of Uribe-Rivera Et Al 2017 Dataset: High Resolution Bioclimatic Layers For Southwest Of South America For Three Recent Past Periods (1970, 1990 And 2010)

These files were generated as part of the article "Dispersal and extrapolation on the accura... more These files were generated as part of the article "Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog" (Uribe-Rivera et al. 2017; accepted in Ecological Applications) We used point data of meteorological stations between 34°-48°S and 70°-75°W, to generate new climatic surfaces for three recent past periods (1970; 1990; 2010). Meteorological data encompassed 293 weather stations, and were extracted from three databases: Dirección Meteorológica de Chile (DMC); Dirección General de Aguas de Chile (DGA); and the FAOClim-NET Agroclimatic database management system (FAO 2001), recording monthly records of mean daily minimum temperature, mean daily maximum temperature and total rainfall for 5-year periods (1965-1969 for 1970 climatic conditions; 1985-1989 for 1990 climatic conditions; and 2005-2009 for 2010 climatic conditions). For each period monthly mean values of each climatic variable were interpolated to ge...

Research paper thumbnail of Climatic Niche Conservatism and Biogeographical Non-Equilibrium in Eschscholzia californica (Papaveraceae), an Invasive Plant in the Chilean Mediterranean Region

Species climate requirements are useful for predicting their geographic distribution. It is often... more Species climate requirements are useful for predicting their geographic distribution. It is often assumed that the niche requirements for invasive plants are conserved during invasion, especially when the invaded regions share similar climate conditions. California and central Chile have a remarkable degree of convergence in their vegetation structure, and a similar Mediterranean climate. Such similarities make these geographic areas an interesting natural experiment for testing climatic niche dynamics and the equilibrium of invasive species in a new environment. We tested to see if the climatic niche of Eschscholzia californica is conserved in the invaded range (central Chile), and we assessed whether the invasion process has reached a biogeographical equilibrium, i.e., occupy all the suitable geographic locations that have suitable conditions under native niche requirements. We compared the climatic niche in the native and invaded ranges as well as the projected potential geograph...

Research paper thumbnail of Environmental changes in two lakes of Northern Patagonia (Chile): A 1000 yr reconstruction based on pollen and charcoal

We aim to reconstruct the environmental changes experimented in Patagonian ecosystems during the ... more We aim to reconstruct the environmental changes experimented in Patagonian ecosystems during the last 1000 years. We analyze sediment cores from two lakes (Thompson and Burgos), located in Aysen Region, Southern Chile. The samples were obtained using a gravity corer and sampled at intervals of 1 cm to 30 cm depth and every 5 cm until the end of the core. Thompson lake sediment core was sampled every 5 cm. Age model is based on radiocarbon datings on bulk sediments and macroremains.

Research paper thumbnail of Predicting the potential distribution of the endemic seabird Pelecanus thagus in the Humboldt Current Large Marine Ecosystem under different climate change scenarios

PeerJ, 2019

Background The effects of global climate change on species inhabiting marine ecosystems are of gr... more Background The effects of global climate change on species inhabiting marine ecosystems are of growing concern, especially for endemic species that are sensitive due to restricted distribution. One method employed for determining the effects of climate change on the distribution of these organisms is species distribution modeling. Methods We generated a model to evaluate the potential geographic distribution and breeding distribution of the Peruvian pelican (Pelecanus thagus). Based on maximum entropy modeling (MaxEnt), we identified the environmental factors that currently affect its geographic distribution and breeding. Then we predicted its future distribution range under two climate change scenarios: moderate (rcp 2.6) and severe (rcp 8.5). Results The mean daytime temperature range and marine primary productivity explain the current potential distribution and breeding of the pelican. Under the future climate change scenarios, the spatial distribution of the pelican is predicted...

Research paper thumbnail of Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog

Ecological Applications, 2017

Research paper thumbnail of Climatic Niche Conservatism and Biogeographical Non-Equilibrium in Eschscholzia californica (Papaveraceae), an Invasive Plant in the Chilean Mediterranean Region

Research paper thumbnail of Invasión de Drosophila suzukii (Matsumura) en Chile: utilizando los modelos de distribución de especies como herramienta de bioseguridad

REVISTA CHILENA DE ENTOMOLOGÍA, 2020

Research paper thumbnail of Dispersal processes and environmental extrapolation on predictive accuracy of species distribution models across time: an example with the endemic and threatened Darwin frog

Research paper thumbnail of Supplementary material 1 from: Ramírez-Albores JE, Richardson DM, Stefenon VM, Bizama GA, Pérez-Suárez M, Badano EI (2021) A global assessment of the potential distribution of naturalized and planted populations of the ornamental alien tree Schinus molle. NeoBiota 68: 105-126. https://doi.org/10....

Research paper thumbnail of Matching global and regional distribution models of the recluse spider<i>Loxosceles rufescens</i>: to what extent do these reflect niche conservatism?

Medical and Veterinary Entomology, Jun 8, 2018

Research paper thumbnail of Dispersal processes and environmental extrapolation on predictive accuracy of species distribution models across time: an example with the endemic and threatened Darwin frog

F1000Research, Feb 28, 2016

Research paper thumbnail of Niche modelling of the Chilean recluse spider<i>Loxosceles laeta</i>and araneophagic spitting spider<i>Scytodes globula</i>and risk for loxoscelism in Chile

Medical and Veterinary Entomology, Jul 18, 2016

Research paper thumbnail of Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog

Ecological Applications, Jun 19, 2017

Research paper thumbnail of Invasión de Drosophila suzukii (Matsumura) en Chile: utilizando los modelos de distribución de especies como herramienta de bioseguridad

Revista chilena de entomología, Jan 31, 2020

Research paper thumbnail of Using Global and Regional Species Distribution Models (SDM) to Infer the Invasive Stage of<i>Latrodectus geometricus</i>(Araneae: Theridiidae) in the Americas

Environmental Entomology, Sep 17, 2016

Research paper thumbnail of Climate change can disproportionately reduce habitats of stream fishes with restricted ranges

Freshwater fishes are among the most threatened taxa worldwide due to changes in land use, specie... more Freshwater fishes are among the most threatened taxa worldwide due to changes in land use, species introductions, and climate change. Although more than half of the freshwater fishes in the Chilean Mediterranean ecoregion are considered vulnerable or endangered, still little is known about their biogeography. Fishes of the family Perciliidae are endemic of this region and ideal cases to study potential implications of global warming given their endangered conservation status, small size, restricted range, and limited dispersal capacity in fragmented habitats. Here, we model the spatial distribution of habitats for Percilia irwini and P. gillissi under current (1970-2000) and future (2050-2080) climatic scenarios (SSP245, SSP585). We implement maximum entropy (MaxEnt) models adapted for stream networks using high-resolution datasets of selected geophysical and climatic variables. At present, both species inhabit relatively low-quality habitats. In the future (SSP585), suitable habita...

Research paper thumbnail of Niche modelling of the Chilean recluse spiderLoxosceles laetaand araneophagic spitting spiderScytodes globulaand risk for loxoscelism in Chile

Medical and Veterinary Entomology, 2016

Research paper thumbnail of Spatio temporal population dynamics of the invasive diatom Didymosphenia geminata in central-southern Chilean rivers

The Science of the total environment, Jan 3, 2016

We document the distribution of Didymosphenia geminata in central-southern Chilean rivers and ide... more We document the distribution of Didymosphenia geminata in central-southern Chilean rivers and identify the chemical and physical factors associated with its presence/absence (p/a). Repeated surveys in five successive years provided evidence that D. geminata could be nearing a biogeographic equilibrium in the region. D. geminata databases from extensive biological and environmental surveys in 187 rivers, within ten catchments, south of 38°S commenced in November 2010 and ran through May 2013. In addition, data from two other field surveys were used. The sites evenly distributed latitudinally were climatically characterized. The recent sampling program, following a published species distribution model, was designed to explore D. geminata distribution within thirteen catchments (34°S-48°S). An extensive river survey in 2014 (spring-summer) and in 2015 (autumn) included the p/a, and relative abundance of D. geminata cells in phytobenthos and in the drift. These p/a results showed that t...

Research paper thumbnail of The Advocate - Sept. 10, 1964

Research paper thumbnail of Matching global and regional distribution models of the recluse spiderLoxosceles rufescens: to what extent do these reflect niche conservatism?

Medical and Veterinary Entomology, 2018

Research paper thumbnail of Uribe-Rivera Et Al 2017 Dataset: High Resolution Bioclimatic Layers For Southwest Of South America For Three Recent Past Periods (1970, 1990 And 2010)

These files were generated as part of the article "Dispersal and extrapolation on the accura... more These files were generated as part of the article "Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog" (Uribe-Rivera et al. 2017; accepted in Ecological Applications) We used point data of meteorological stations between 34°-48°S and 70°-75°W, to generate new climatic surfaces for three recent past periods (1970; 1990; 2010). Meteorological data encompassed 293 weather stations, and were extracted from three databases: Dirección Meteorológica de Chile (DMC); Dirección General de Aguas de Chile (DGA); and the FAOClim-NET Agroclimatic database management system (FAO 2001), recording monthly records of mean daily minimum temperature, mean daily maximum temperature and total rainfall for 5-year periods (1965-1969 for 1970 climatic conditions; 1985-1989 for 1990 climatic conditions; and 2005-2009 for 2010 climatic conditions). For each period monthly mean values of each climatic variable were interpolated to ge...

Research paper thumbnail of Climatic Niche Conservatism and Biogeographical Non-Equilibrium in Eschscholzia californica (Papaveraceae), an Invasive Plant in the Chilean Mediterranean Region

Species climate requirements are useful for predicting their geographic distribution. It is often... more Species climate requirements are useful for predicting their geographic distribution. It is often assumed that the niche requirements for invasive plants are conserved during invasion, especially when the invaded regions share similar climate conditions. California and central Chile have a remarkable degree of convergence in their vegetation structure, and a similar Mediterranean climate. Such similarities make these geographic areas an interesting natural experiment for testing climatic niche dynamics and the equilibrium of invasive species in a new environment. We tested to see if the climatic niche of Eschscholzia californica is conserved in the invaded range (central Chile), and we assessed whether the invasion process has reached a biogeographical equilibrium, i.e., occupy all the suitable geographic locations that have suitable conditions under native niche requirements. We compared the climatic niche in the native and invaded ranges as well as the projected potential geograph...

Research paper thumbnail of Environmental changes in two lakes of Northern Patagonia (Chile): A 1000 yr reconstruction based on pollen and charcoal

We aim to reconstruct the environmental changes experimented in Patagonian ecosystems during the ... more We aim to reconstruct the environmental changes experimented in Patagonian ecosystems during the last 1000 years. We analyze sediment cores from two lakes (Thompson and Burgos), located in Aysen Region, Southern Chile. The samples were obtained using a gravity corer and sampled at intervals of 1 cm to 30 cm depth and every 5 cm until the end of the core. Thompson lake sediment core was sampled every 5 cm. Age model is based on radiocarbon datings on bulk sediments and macroremains.

Research paper thumbnail of Predicting the potential distribution of the endemic seabird Pelecanus thagus in the Humboldt Current Large Marine Ecosystem under different climate change scenarios

PeerJ, 2019

Background The effects of global climate change on species inhabiting marine ecosystems are of gr... more Background The effects of global climate change on species inhabiting marine ecosystems are of growing concern, especially for endemic species that are sensitive due to restricted distribution. One method employed for determining the effects of climate change on the distribution of these organisms is species distribution modeling. Methods We generated a model to evaluate the potential geographic distribution and breeding distribution of the Peruvian pelican (Pelecanus thagus). Based on maximum entropy modeling (MaxEnt), we identified the environmental factors that currently affect its geographic distribution and breeding. Then we predicted its future distribution range under two climate change scenarios: moderate (rcp 2.6) and severe (rcp 8.5). Results The mean daytime temperature range and marine primary productivity explain the current potential distribution and breeding of the pelican. Under the future climate change scenarios, the spatial distribution of the pelican is predicted...

Research paper thumbnail of Dispersal and extrapolation on the accuracy of temporal predictions from distribution models for the Darwin's frog

Ecological Applications, 2017

Research paper thumbnail of Climatic Niche Conservatism and Biogeographical Non-Equilibrium in Eschscholzia californica (Papaveraceae), an Invasive Plant in the Chilean Mediterranean Region

Research paper thumbnail of Invasión de Drosophila suzukii (Matsumura) en Chile: utilizando los modelos de distribución de especies como herramienta de bioseguridad

REVISTA CHILENA DE ENTOMOLOGÍA, 2020

Research paper thumbnail of Dispersal processes and environmental extrapolation on predictive accuracy of species distribution models across time: an example with the endemic and threatened Darwin frog

Research paper thumbnail of Supplementary material 1 from: Ramírez-Albores JE, Richardson DM, Stefenon VM, Bizama GA, Pérez-Suárez M, Badano EI (2021) A global assessment of the potential distribution of naturalized and planted populations of the ornamental alien tree Schinus molle. NeoBiota 68: 105-126. https://doi.org/10....