Assessment of threats to ecosystems in South America

Jarvis, Andy; Touval, Jerome L.; Schmitz, Mauricio Castro; Sotomayor, Leonardo; Hyman, Glenn

doi:10.1016/j.jnc.2009.08.003

Cited by 60 publications

(62 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As far as we know, this is the first systematic threat assessment of plant species at intraspecific level. Our approach complements spatial threat assessments at species and ecosystem level (Jarvis, Touval, Schmitz, Sotomayor, & Hyman, 2010;Ramirez-Villegas, Jarvis, & Touval, 2012;Underwood, Viers, Klausmeyer, Cox, & Shaw, 2009). …”

Section: Trade In Endangered Species (Cites)mentioning

confidence: 99%

“…We combined six maps showing different types of threats associated with human pressure on ecosystems, developed by Jarvis et al (2010), into one map of direct human pressure, which reflects the maximum value among the six threats in each pixel. The six depicted threats are due to (1) human accessibility; (2) conversion to agriculture; (3) fires; (4) grazing pressure; (5) infrastructure; and (6) land clearance because of oil and gas.…”

Section: Direct Human Pressurementioning

confidence: 99%

“…The six depicted threats are due to (1) human accessibility; (2) conversion to agriculture; (3) fires; (4) grazing pressure; (5) infrastructure; and (6) land clearance because of oil and gas. The threat maps have a 2.5 arc minutes resolution and indicate a threat magnitude from 0 (no threat) to 3 (maximum threat), which is determined by the threat exposure on the basis of freely available datasets and threat sensitivity at ecosystem level according to experts (Jarvis et al, 2010).…”

Section: Direct Human Pressurementioning

confidence: 99%

“…The maps of direct human pressure, which were used in our analysis, indicate sensitivity to threat exposure at ecosystem level but not at species level (Jarvis et al, 2010). Although these maps can be used for continental threat assessments, the threat values should be interpreted carefully for specific species.…”

Section: Limitations and Future Researchmentioning

confidence: 99%

See 3 more Smart Citations

Tree genetic resources at risk in South America: A spatial threat assessment to prioritize populations for conservation

Zonneveld

Thomas²,

Castañeda‐Álvarez³

et al. 2018

Diversity and Distributions

View full text Add to dashboard Cite

show abstract

Section: Trade In Endangered Species (Cites)mentioning

confidence: 99%

Section: Direct Human Pressurementioning

confidence: 99%

Section: Direct Human Pressurementioning

confidence: 99%

Section: Limitations and Future Researchmentioning

confidence: 99%

See 2 more Smart Citations

Tree genetic resources at risk in South America: A spatial threat assessment to prioritize populations for conservation

Zonneveld

Thomas²,

Castañeda‐Álvarez³

et al. 2018

Diversity and Distributions

View full text Add to dashboard Cite

show abstract

“…In the case of threats, all were divided by 3, which is the 176 maximum value reported by Jarvis et al (2010), in the case of PE and PTP the division 177 was done by 100, and in the case of HD and VD the division was done by the maximum 178 vertical and horizontal distances of the continent (7,505 and 5,170 km, respectively). 179…”

Section: Taxon-and Genus-specific Assessmentmentioning

confidence: 99%

Analysis of threats to South American flora and its implications for conservation

Ramírez-Villegas

Jarvis

Touval

2012

Journal for Nature Conservation

Self Cite

View full text Add to dashboard Cite

Modeling forest dynamics along climate gradients in Bolivia

et al. 2014

View full text Add to dashboard Cite

Dynamic vegetation models have been used to assess the resilience of tropical forests to climate change, but the global application of these modeling experiments often misrepresents carbon dynamics at a regional level, limiting the validity of future projections. Here a dynamic vegetation model (Lund Potsdam Jena General Ecosystem Simulator) was adapted to simulate present-day potential vegetation as a baseline for climate change impact assessments in the evergreen and deciduous forests of Bolivia. Results were compared to biomass measurements (819 plots) and remote sensing data. Using regional parameter values for allometric relations, specific leaf area, wood density, and disturbance interval, a realistic transition from the evergreen Amazon to the deciduous dry forest was simulated. This transition coincided with threshold values for precipitation (1400 mm yr −1 ) and water deficit (i.e., potential evapotranspiration minus precipitation) (−830 mm yr −1 ), beyond which leaf abscission became a competitive advantage. Significant correlations were found between modeled and observed values of seasonal leaf abscission (R 2 = 0.6, p <0.001) and vegetation carbon (R 2 = 0.31, p <0.01). Modeled Gross Primary Productivity (GPP) and remotely sensed normalized difference vegetation index showed that dry forests were more sensitive to rainfall anomalies than wet forests. GPP was positively correlated to the El Niño-Southern Oscillation index in the Amazon and negatively correlated to consecutive dry days. Decreasing rainfall trends were simulated to reduce GPP in the Amazon. The current model setup provides a baseline for assessing the potential impacts of climate change in the transition zone from wet to dry tropical forests in Bolivia.

show abstract

Assessment of threats to ecosystems in South America

Cited by 60 publications

References 7 publications

Tree genetic resources at risk in South America: A spatial threat assessment to prioritize populations for conservation

Tree genetic resources at risk in South America: A spatial threat assessment to prioritize populations for conservation

Analysis of threats to South American flora and its implications for conservation

Modeling forest dynamics along climate gradients in Bolivia

Contact Info

Product

Resources

About