scholarly journals Quantifying Changes on Forest Succession in a Dry Tropical Forest Using Angular-Hyperspectral Remote Sensing

2018 ◽  
Vol 10 (12) ◽  
pp. 1865 ◽  
Author(s):  
Virginia Garcia Millan ◽  
Arturo Sanchez-Azofeifa
Keyword(s):  
Large Scale ◽  
Forest Succession ◽  
Early Stage ◽  
Tropical Dry Forest ◽  
Intermediate Stage ◽  
Hyperspectral Data ◽  
Dry Forest ◽  
Support Vector ◽  
Spectral Angle Mapper ◽  
Different Levels

The tropical dry forest (TDF) is one the most threatened ecosystems in South America, existing on a landscape with different levels of ecological succession. Among satellites dedicated to Earth observation and monitoring ecosystem succession, CHRIS/PROBA is the only satellite that presents quasi-simultaneous multi-angular pointing and hyperspectral imaging. These two characteristics permit the study of structural and compositional differences of TDFs with different levels of succession. In this paper, we use 2008 and 2014 CHRIS/PROBA images from a TDF in Minas Gerais, Brazil to study ecosystem succession after abandonment. Using a −55° angle of observation; several classifiers including spectral angle mapper (SAM), support vector machine (SVM), and decision trees (DT) were used to test how well they discriminate between different successional stages. Our findings suggest that the SAM is the most appropriate method to classify TDFs as a function of succession (accuracies ~80 for % for late stage, ~85% for the intermediate stage, ~70% for early stage, and ~50% for other classes). Although CHRIS/PROBA cannot be used for large-scale/long-term monitoring of tropical forests because of its experimental nature; our results support the potential of using multi-angle hyperspectral data to characterize the structure and composition of TDFs in the near future.

scholarly journals Tree diameter growth for three successional stages of Tropical Dry Forest in Minas Gerais, Brazil

2017 ◽  
Vol 14 (35) ◽  
pp. 24 ◽  
Author(s):  
Sofía Calvo-Rodriguez ◽  
Mario M. Do Espírito-Santo ◽  
Yule R.F. Nunes ◽  
Julio Calvo-Alvarado
Keyword(s):  
Late Stage ◽  
Early Stage ◽  
Tropical Dry Forest ◽  
Intermediate Stage ◽  
Minas Gerais ◽  
Dry Forest ◽  
Permanent Plots ◽  
Diameter Growth ◽  
Diameter Class ◽  
Successional Stages

he tropical dry forests of Brazil are classified as the most threatened and disturbed ecosystems in the country. We estimate the diameter growth in three successional stages in the Mata Seca State Park, in Minas Gerais, Brazil, through annual measurement of all individuals with more than 5 cm of diameter at breast height in 18 permanent plots (6 plots for each succession stage) in the early, intermediate, and late successional stages, over a period of 5 years (2006-2011). With this information the annual diameter increments for each individual were calculated to determine the diameter increments per stage, plot, and diameter class. The results show the following annual increments for each stage of succession: early (5.02 mm/year), intermediate (2.55 mm/year), and late (1.91 mm/year). We found high similarity in incremental growth between the plots in the intermediate and late stages. The greatest increments in the early stage was in  the 15-20 cm diameter class, in the intermediate stage in the 30-35 cm class, and in the late stage in the 45-50 cm class. The dominant species with the highest increments were Myracrodruon urundeuva (9.33 mm/year) and Mimosa hostilis (10.35 mm/year). Species with lower increments were mostly those of the late stage. The high diameter increment in the early stage and the differences we observed between stages were associated with species composition and biophysical factors that regulate the growth and structure of each forest.

Testing Chronosequences through Dynamic Approaches: Time and Site Effects on Tropical Dry Forest Succession

Biotropica ◽  
2014 ◽  
Vol 47 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Francisco Mora ◽  
Miguel Martínez-Ramos ◽  
Guillermo Ibarra-Manríquez ◽  
Alfredo Pérez-Jiménez ◽  
Jenny Trilleras ◽  
...  
Keyword(s):  
Site Effects ◽  
Forest Succession ◽  
Tropical Dry Forest ◽  
Dry Forest

scholarly journals Myiarchus flycatchers are the primary seed dispersers of Bursera longipes in a Mexican dry forest: An overlooked coevolutionary process?

2015 ◽  
Author(s):  
R. Carlos Almazán-Núñez ◽  
Luis E. Eguiarte ◽  
María del Coro Arizmendi ◽  
Pablo Corcuera
Keyword(s):  
Forest Succession ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Geographic Mosaic ◽  
Frugivorous Birds ◽  
Nurse Plants ◽  
Adaptive Processes ◽  
Mutualistic Relationship ◽  
Seed Dispersers ◽  
Study Sites

We evaluated the seed dispersal of Bursera longipes by birds along a successional gradient of tropical dry forest (TDF) in southwestern Mexico. B. longipes is an endemic tree to the TDF in the Balsas basin. The relative abundance of frugivorous birds, their frequency of visits to B. longipes and the number of removed fruits were recorded at three study sites with different stages of forest succession (early, intermediate and mature) characterized by distinct floristic and structural elements. Flycatchers of the Myiarchus and Tyrannus genera removed the majority of fruits at each site. Overall, visits to B. longipes were less frequent at the early successional site. Birds that function as legitimate dispersers by consuming whole seeds and regurgitating or defecating intact seeds in the process also remove the pseudoaril from seeds, thereby facilitating the germination process. The highest germination percentages were recorded for seeds that passed through the digestive tract of two migratory flycatchers: M. cinerascens and M. nutingii. Perch plants, mainly composed of legumes (e.g., Eysenhardtia polystachya, Acacia cochliacantha, Calliandra eryophylla, Mimosa polyantha), serve also as nurse plants since the number of young individuals recruited from B. longipes was higher under these than expected by chance. This study shows that Myiarchus flycatchers are the most efficient seed dispersers of B. longipes across all successional stages. This suggests a close mutualistic relationship derived from adaptive processes and local specializations throughout the distribution of both taxa, as supported by the geographic mosaic theory of coevolution.

scholarly journals Myiarchusflycatchers are the primary seed dispersers ofBursera longipesin a Mexican dry forest

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2126 ◽  
Author(s):  
R. Carlos Almazán-Núñez ◽  
Luis E. Eguiarte ◽  
María del Coro Arizmendi ◽  
Pablo Corcuera
Keyword(s):  
Forest Succession ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Geographic Mosaic ◽  
Frugivorous Birds ◽  
Nurse Plants ◽  
Adaptive Processes ◽  
Mutualistic Relationship ◽  
Seed Dispersers ◽  
Study Sites

We evaluated the seed dispersal ofBursera longipesby birds along a successional gradient of tropical dry forest (TDF) in southwestern Mexico.B. longipesis an endemic tree to the TDF in the Balsas basin. The relative abundance of frugivorous birds, their frequency of visits toB. longipesand the number of removed fruits were recorded at three study sites with different stages of forest succession (early, intermediate and mature) characterized by distinct floristic and structural elements. Flycatchers of theMyiarchusandTyrannusgenera removed the majority of fruits at each site. Overall, visits toB. longipeswere less frequent at the early successional site. Birds that function as legitimate dispersers by consuming whole seeds and regurgitating or defecating intact seeds in the process also remove the pseudoaril from seeds, thereby facilitating the germination process. The highest germination percentages were recorded for seeds that passed through the digestive system of two migratory flycatchers:M. cinerascensandM. nutingii. Perch plants, mainly composed of legumes (e.g.,Eysenhardtia polystachya, Acacia cochliacantha, Calliandra eryophylla, Mimosa polyantha), serve also as nurse plants since the number of young individuals recruited fromB. longipeswas higher under these than expected by chance. This study shows thatMyiarchusflycatchers are the most efficient seed dispersers ofB. longipesacross all successional stages. This suggests a close mutualistic relationship derived from adaptive processes and local specializations throughout the distribution of both taxa, as supported by the geographic mosaic theory of coevolution.

Mapping tropical dry forest succession using multiple criteria spectral mixture analysis

2015 ◽  
Vol 109 ◽  
pp. 17-29 ◽  
Author(s):  
Sen Cao ◽  
Qiuyan Yu ◽  
Arturo Sanchez-Azofeifa ◽  
Jilu Feng ◽  
Benoit Rivard ◽  
...  
Keyword(s):  
Forest Succession ◽  
Tropical Dry Forest ◽  
Multiple Criteria ◽  
Dry Forest ◽  
Spectral Mixture Analysis ◽  
Mixture Analysis ◽  
Spectral Mixture

Temporal variation in the influence of forest succession on caterpillar communities: A long‐term study in a tropical dry forest 

Biotropica ◽  
2019 ◽  
Vol 51 (4) ◽  
pp. 529-537 ◽  
Author(s):  
Karina Boege ◽  
Edith Villa‐Galaviz ◽  
Antonio López‐Carretero ◽  
Rubén Pérez‐Ishiwara ◽  
Alejandro Zaldivar‐Riverón ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Forest Succession ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Term Study ◽  
Long Term Study

scholarly journals Tropical dry forest succession and the contribution of lianas to wood area index (WAI)

2009 ◽  
Vol 258 (6) ◽  
pp. 941-948 ◽  
Author(s):  
G. Arturo Sánchez-Azofeifa ◽  
Margaret Kalácska ◽  
Mario Marcos do Espírito-Santo ◽  
G. Wilson Fernandes ◽  
Stefan Schnitzer
Keyword(s):  
Forest Succession ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Area Index

scholarly journals Seabed Mapping in Coastal Shallow Waters Using High Resolution Multispectral and Hyperspectral Imagery

2018 ◽  
Vol 10 (8) ◽  
pp. 1208 ◽  
Author(s):  
Javier Marcello ◽  
Francisco Eugenio ◽  
Javier Martín ◽  
Ferran Marqués
Keyword(s):  
High Resolution ◽  
Aquatic Vegetation ◽  
Hyperspectral Imagery ◽  
Remote Sensing Data ◽  
Hyperspectral Data ◽  
Support Vector ◽  
Shallow Waters ◽  
Benthic Habitats ◽  
Spectral Angle Mapper ◽  
Seabed Mapping

Coastal ecosystems experience multiple anthropogenic and climate change pressures. To monitor the variability of the benthic habitats in shallow waters, the implementation of effective strategies is required to support coastal planning. In this context, high-resolution remote sensing data can be of fundamental importance to generate precise seabed maps in coastal shallow water areas. In this work, satellite and airborne multispectral and hyperspectral imagery were used to map benthic habitats in a complex ecosystem. In it, submerged green aquatic vegetation meadows have low density, are located at depths up to 20 m, and the sea surface is regularly affected by persistent local winds. A robust mapping methodology has been identified after a comprehensive analysis of different corrections, feature extraction, and classification approaches. In particular, atmospheric, sunglint, and water column corrections were tested. In addition, to increase the mapping accuracy, we assessed the use of derived information from rotation transforms, texture parameters, and abundance maps produced by linear unmixing algorithms. Finally, maximum likelihood (ML), spectral angle mapper (SAM), and support vector machine (SVM) classification algorithms were considered at the pixel and object levels. In summary, a complete processing methodology was implemented, and results demonstrate the better performance of SVM but the higher robustness of ML to the nature of information and the number of bands considered. Hyperspectral data increases the overall accuracy with respect to the multispectral bands (4.7% for ML and 9.5% for SVM) but the inclusion of additional features, in general, did not significantly improve the seabed map quality.

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