Delayed responses and extinction debt: an opportunity for the conservation of Chaco Serrano forest birds DOI Open Access
Luna Emilce Silvetti, Gregorio Gavier-Pizarro, Julieta Rocío Arcamone

et al.

Animal Conservation, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 16, 2024

Abstract Land‐use change is one of the main threats to biodiversity at global level, and subtropical dry forests are not exempt from such a threat. Recent studies suggest that species can become extinct with considerable time lag, even if no further habitat loss occurs. Hence, there may be an extinction debt, which poses great challenge conservation. Here, we analyzed response taxonomic functional richness forest understory specialist birds 30 years (data 1989, 2004 2019) land‐cover land‐use changes in Chaco Serrano central Argentina. Our results showed occurrence debt both birds, being greater birds. Results for trait were inconclusive. We also found evidence equally sensitive change, indicating species‐specific response. conclude current presence some large native patches intermediate degree isolation region might prolonging persistence bird traits. Moreover, ecological legacies strongly affect distribution pattern permanence traits fragmented landscapes. These findings should considered conservation planning.

Language: Английский

30 Years of Land Cover Changes Within a Global Deforestation Front: Insights From the Chaco Serrano Mountains DOI Open Access
Julieta Rocío Arcamone, Laura M. Bellis, Luna Emilce Silvetti

et al.

Land Degradation and Development, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

ABSTRACT The South American Gran Chaco is among the most threatened ecoregions worldwide. Although land use change in plains of this region has been widely studied, less known about southern mountainous areas. Our main goal was to analyze cover dynamics Serrano between 1989 and 2019. We developed 3 maps for Sierras Chicas central Argentina (1989, 2004 2019) performed a analysis. forests lost 67,055 ± 8127 ha, annual rate deforestation increased from −0.58 (1989–2004) −1.87 (2004–2019). Between 2019, grasslands exhibited second‐highest negative (−0.59). In shrublands became dominant cover, increasing their size by 30% compared 1989. Urban areas had highest positive (5.60) extension 1% total study area 5% Invasive alien species expanded rapidly but only specific findings show that processes mountains have differed those observed plain were consistent with other regions world. current scenario forest critical, if conservation strategies are not applied near future, it could be expected forest, unique ecosystem within Chaco, would eventually disappear.

Language: Английский

Citations

0
Plant sexual reproduction is influenced by fire frequency: evidence from a resprouting herb in Chaco ecosystems DOI Open Access

M. L. Tosatto,

Ramiro Aguilar, Lucas M. Carbone

et al.

Plant Biology, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Reduced competition and increased availability of abiotic resources shortly after a fire can favour growth flowering herbaceous species. These changes may also affect the pollinator community, reproductive success, and, potentially, characteristics progeny. However, anthropogenic increases in frequency fires could reverse beneficial effects fire. We evaluate effect on sexual expression, pollination, female early progeny vigour Solanum palinacanthum, an andromonoecious resprouting herb South American Chaco ecosystems. Measurements were performed at six sites along gradient frequency, ranging from 0 to 5 over 22 years. found that plant size proportion hermaphrodite (relative male) flowers intermediate (twice burned) compared unburned sites, but both declined high‐fire sites. Pollinator visits more frequent plants area with frequency. Although did not enhance probability fruit set, it total number site burned twice. Seeds had higher mass germination rates. Soil maternal environmental shaped by play key role reproduction S. palinacanthum . Nonetheless, due human activities override reproduction.

Language: Английский

Citations

0
Fires in the South American Chaco, from dry forests to wetlands: response to climate depends on land cover DOI Creative Commons
Rodrigo San Martín, Catherine Ottlé, Anna Sörensson

et al.

Fire Ecology, Journal Year: 2023, Volume and Issue: 19(1)

Published: Oct. 2, 2023

Abstract Background Wildfires represent an important element in the bio-geophysical cycles of various ecosystems across globe and are particularly related to land transformation tropical subtropical regions. In this study, we analyzed links between fires, use (LU), meteorological variables South American Chaco (1.1 million km 2 ), a global deforestation hotspot fire-exposed region that has recently attracted greater attention as largest one last dry forests world. Results We found Dry (73% total area Chaco) exhibits unimodal fire seasonality (winter-spring), Wet (the remaining 23%) displays bimodal (summer-autumn winter-spring). While most burnt (BA) was (113,859 ; 55% entire BA), showed fraction forest loss (93,261 88% loss). Between 2001 2019, 26% Chaco’s occurred areas with BA detections, percentage varies regionally countries, revealing potential connections LU policy. Argentina lost 51,409 its tree cover, surpassing losses Paraguay Bolivia, 40% detections. The effect fluctuations on fuel production flammability cover (LC), which emerged principal factor behind BA. wet covered herbaceous vegetation negative correlations precipitation, some regions below 800 mm/year, mostly by shrublands, positive correlations. These results reveal two different roles precipitation (a) moisture content (b) biomass fuel. Conclusions As fires keep expanding Chaco, our study represents step forward understanding their drivers effects. is dependent LC types, explains discrepancies frequency subregions. also vary exposing role anthropic forcing, management, To better understand interactions these drivers, further studies at regional scale combining environmental sciences social needed. Such research should help policy makers take action preserve protect wetlands Chaco.

Language: Английский

Citations

5
Detection of woody species Schinopsis haenkeana using phenological spectral differences and NDVI texture measures in subtropical forests DOI
Luna Emilce Silvetti, Laura M. Bellis

Remote Sensing Applications Society and Environment, Journal Year: 2023, Volume and Issue: 33, P. 101128 - 101128

Published: Dec. 19, 2023

Language: Английский

Citations

1
Delayed responses and extinction debt: an opportunity for the conservation of Chaco Serrano forest birds DOI Open Access
Luna Emilce Silvetti, Gregorio Gavier-Pizarro, Julieta Rocío Arcamone

et al.

Animal Conservation, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 16, 2024

Abstract Land‐use change is one of the main threats to biodiversity at global level, and subtropical dry forests are not exempt from such a threat. Recent studies suggest that species can become extinct with considerable time lag, even if no further habitat loss occurs. Hence, there may be an extinction debt, which poses great challenge conservation. Here, we analyzed response taxonomic functional richness forest understory specialist birds 30 years (data 1989, 2004 2019) land‐cover land‐use changes in Chaco Serrano central Argentina. Our results showed occurrence debt both birds, being greater birds. Results for trait were inconclusive. We also found evidence equally sensitive change, indicating species‐specific response. conclude current presence some large native patches intermediate degree isolation region might prolonging persistence bird traits. Moreover, ecological legacies strongly affect distribution pattern permanence traits fragmented landscapes. These findings should considered conservation planning.

Language: Английский

Citations

0