Drivers of fire occurrence in a mountainous Brazilian cerrado savanna: Tracking long-term fire regimes using remote sensing

Alvarado, Swanni T.; Fornazari, Tamires; Cóstola, Andresa; Morellato, Leonor Patrícia Cerdeira; Silva, Thiago Sanna Freire

doi:10.1016/j.ecolind.2017.02.037

Cited by 99 publications

(87 citation statements)

References 66 publications

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“…Cipo Cinclodes occur in areas with a fire frequency of 3–6 yr (Alvarado et al. ). More frequent man‐made fires may pose a threat to the campos rupestres , but the ecological consequences and impacts of such fires have been poorly studied (Figueira et al.…”

Section: Discussionmentioning

confidence: 99%

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

et al. 2019

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Birds in the genus Cinclodes are habitat specialists, with most restricted to the highlands of South America. The recently described Cipo Cinclodes (C. espinhacensis) is isolated in the southern Espinhaço Range of Brazil and is considered Endangered in Brazil and Near Threatened by the IUCN, but as a subspecies of Long‐tailed Cinclodes (C. pabsti). We examined the population and spatial ecology of Cipo Cinclodes at two geographic scales to improve our understanding of their basic biology and conservation status. We monitored 30 birds at Serra do Breu and found relatively large home ranges (mean = 9.3 ha), a density of paired adults of 0.09/ha, a male‐skewed adult sex ratio (males/total adults = 0.57) due to territories occupied by unpaired males, and long‐term site fidelity. Cipo Cinclodes used all habitat types available in our study area, including rocky outcrops, grasslands, and riparian areas, but habitat selection analyses revealed the importance of riparian areas for foraging and rocky outcrops for nesting. At the species distribution scale, we compiled known and novel recorded occurrence points and used them to calculate the extent of occurrence (EOO) and the area of occupancy (AOO). We used a Maxent species distribution model to generate a binary map to estimate upper limits for EOO (EOO around the model predicted area) and AOO (comprised by the model predicted area within the EOO). We obtained 41 locations, resulting in an EOO of 890.7 km2 (up to 1748.7 km2) and an AOO of 100 km2 (up to 327.5 km2). The global population is estimated to be between 880 and 2882 birds, which is concerning because small populations are at risk of extinction due to demographic stochasticity, genetic drift, and the interaction of these factors. As such, our results support the designation of Cipo Cinclodes as Endangered on the Brazilian red list.

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Section: Discussionmentioning

confidence: 99%

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

et al. 2019

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Section: Fire Assessment and Variablesmentioning

confidence: 99%

“…The study region has been historically affected by a severe natural fire regime and the occurrence of criminal fires (Alvarado et al, 2017). There was an extensive fire event in 2014, and the fire event before that was in 2011 (see Alvarado et al, 2017).…”

Section: Site Descriptionmentioning

confidence: 99%

“…We acquired fire event data from Alvarado et al (2017). These authors mapped burn scars by visual interpretation of false colour composites of each Landsat satellite image from 1984 to 2014 with manual delineation at the fixed visualisation scale of 1:25 000 [see Alvarado et al (2017) for additional details]. We then compared the locations of our sampling sites with the registered fire events to determine which sampling points had been affected by the 2014 fire event, as well as the last local fire event and the frequency of fire occurrence at the sampling points since 1984.…”

Section: Fire Assessment and Variablesmentioning

confidence: 99%

“…The campos rupestres (rupestrian grasslands) ecosystem in the Cerrado is widely known for its severe and intensive fire regime Alvarado et al, 2017). This ecosystem harbours an unique diversity of plants and animals with a high degree of endemism, and which exist under severe environmental stresses (Fernandes, 2016;Silveira et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Fire? They don't give a dung! The resilience of dung beetles to fire in a tropical savanna

Nunes

Beiroz

Silva

et al. 2018

Ecological Entomology

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1. Disturbance is a strong driver of community assembly and fire has long been recognised as one of the main disturbances of terrestrial ecosystems. This study tested the resilience of dung beetles to fire events in campos rupestres, which is a tropical savanna ecosystem that evolved under a frequent fire regime, by assessing the resistance and recovery of their communities.2. Dung beetles were sampled before and after a fire event and the effect of fire on dung beetle richness, abundance, mean community biomass and composition was tested. The effects of time since last fire and fire frequency on the community were also tested.3. No effect of fire occurrence, time since last fire and fire frequency on any community variable was found.4. Some non-mutually exclusive mechanisms promoting the resistance and recovery of dung beetles in campos rupestres could be acting in synergy. One potential mechanism is the mismatched seasonality between fire events and dung beetle occurrence, as fires occur during the dry season and dung beetles are present above ground during the rainy season. Furthermore, dung beetles are insects that remain buried during most of their lifetime, which could protect individuals from being burned. Another potential mechanism is the replacement of species in burned areas by the movement of individuals from unburned areas, attracted by resources and/or by metacommunity dynamics.5. It is concluded that in this 'fire-dependent' ecosystem, dung beetle communities are resilient to fire and seem not to be structured by this disturbance.

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Color signals of bee‐pollinated flowers: the significance of natural leaf background

Martins

Arista

Morellato

et al. 2021

American J of Botany

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Flower color is a primary pollinator attractant and generally adjusted to the cognitive system of the pollinators. The perception of flower color depends on the visual system of pollinators and also on environmental factors such as light conditions and the background against which flowers are displayed. METHODS:Using bee-pollinated Fabaceae species as a model, we analyzed flower color diversity and compared flower color signals considering both the standard green and the natural leaf background of two tropical seasonally dry vegetations-a mountain rupestrian grassland (campo rupestre) and a woody savanna (cerrado)-compared to a nontropical Mediterranean shrubland. RESULTS: By using natural background, bees discriminated color for 58% of the flowers in the campo rupestre and for only 43% in cerrado. Both vegetations were surpassed by 75% of bee color discrimination in Mediterranean vegetation. Chromatic contrast and purity were similar among the three vegetation types. Green contrast and brightness were similar between the tropical vegetations but differed from the Mediterranean shrubland. Green contrast differences were lost when using a standard green background, and most variables (purity, green contrast, and brightness) differed according to the background (natural or standard green) in all vegetations. CONCLUSIONS:The natural background influenced bee perception of flower color regardless of vegetation. The background of the campo rupestre promoted green contrast for flowers, ensuring flower detection by pollinators and, along with bees, may also act as a selective pressure driving the diversity of flower colors in Fabaceae species. We highlight the importance of considering the natural background coloration when analyzing flower color signals.

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Drivers of fire occurrence in a mountainous Brazilian cerrado savanna: Tracking long-term fire regimes using remote sensing

Cited by 99 publications

References 66 publications

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

Spatial ecology and conservation of the microendemic ovenbird Cipo Cinclodes (Cinclodes espinhacensis) from the Brazilian highlands

Fire? They don't give a dung! The resilience of dung beetles to fire in a tropical savanna

Color signals of bee‐pollinated flowers: the significance of natural leaf background

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