scholarly journals Trees and shrubs of the tropical dry forest of the Magdalena river upper watershed (Colombia)

2019 ◽  
Vol 7 ◽  
Author(s):  
Luz Romero-Duque ◽  
Jesion Rosero-Toro ◽  
Mateo Fernández-Lucero ◽  
Andrea Simbaqueba-Gutierrez ◽  
Caterinne Pérez
Keyword(s):  
Forest Conservation ◽  
Conservation Status ◽  
Tropical Dry Forest ◽  
Abundant Species ◽  
Dry Forest ◽  
Forest Patches ◽  
Conservation Area ◽  
Magdalena River ◽  
North And South ◽  
Trees And Shrubs

We describe the database of trees and shrubs of tropical dry forest patches of the Magdalena upper river basin in Colombia, preserved in the Herbarium of Universidad de Ciencias Aplicadas y Ambientales. The dataset includes 211 taxa, from which 156 were identified to species. We reported 48 families and 137 genera. The most species rich and abundant families were Fabaceae and Rubiaceae and the most abundant species was Talisia stricta (Sapindaceae). We found differences in diversity between north and south zones of the study area. The Magdalena river upper watershed region is an important tropical dry forest conservation area. Twenty nine species and 4 genera recorded in this study have not been reported in previous reviews of the region. Additionally, Oxandra espintana is reported in literature as critically endangered and Aspidosperma polyneuron is reported as endangered, but there are no studies about their conservation status in the region. Our results suggest the strong need to develop additional inventories of plants that contribute to the knowledge of the plant diversity of this ecosystem in the region and studies of their conservation status.

scholarly journals MAMIFEROS EN DOS LOCALIDADES DE SELVA SECA EN EL ESTADO DE GUERRERO

2016 ◽  
Vol 6 (2) ◽  
pp. 50
Author(s):  
Alejandro Marín ◽  
Gerardo Ceballos ◽  
Jesús Pacheco
Keyword(s):  
Latin America ◽  
Endangered Species ◽  
Conservation Status ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Pacific Region ◽  
Forest Patches ◽  
Mexican Pacific ◽  
Global Context ◽  
Terrestrial Mammals

RESUMENLas selvas secas son uno de los ecosistemas más diversos y amenazados en Latinoamérica. Se realizó un muestreo de la mastofauna terrestre en dos localidades de las selvas secas del estado de Guerrero en el Pacífico mexicano. En total se registraron 44 especies de mamíferos terrestres que pertenecen a 20 familias y 8 órdenes, lo que representa el 9% de la mastofauna terrestre del país y el 29% para el estado de Guerrero. De las especies encontradas, 9 son endémicas a México. Sobre el estado de conservación, 3 de ellas se encuentran amenazadas y 3 en peligro de extinción de acuerdo a la lista mexicana de especies en riesgo. A nivel mundial, 2 especies son consideradas vulnerables. Destacan los registros del zorrillo pigmeo (Spilogale pygmaea), la rata leñera (Hodomys alleni) y el jaguarundi (Herpailurus yagouaroundi). Para los murciélagos Musonycteris harrisoni y Myotis carteri se amplía su rango de distribución con los registros aquí presentados. La diversidad de mamíferos registrada enfatiza la importancia de conservar parches de selva en ambientes altamente urbanizados, así como la necesidad de estrategias que incrementen la conectividad entre los diferentes parches y que consideren las amenazas urbanas a la fauna en estos sitios.Palabras clave: Acapulco de Juárez, Guerrero, mamíferos, Omitlán, selva seca.ABSTRACTThe tropical dry forest represents one of the most diverse and threatened ecosystems in Latin America. We carried out a survey of the terrestrial mammals’ community in two locations at the Mexican Pacific region of dry forest in Guerrero state. We registered 44 species of mammals belonging to 20 families and 8 orders, representing 9 % of Mexico’s terrestrial mammals and 29 % of Guerrero’s. About 9 species of the mammals reported in this study are endemic to Mexico. About the conservation status, 3 species are classified as “threatened” and 3 as “endangered” in the Mexican list of endangered species. In the global context, 2 species are listed as vulnerable. Also, the presence of the pygmy skunk (Spilogale pygmaea), the allen’s woodrat (Hodomys alleni) and the presence of the jaguaroundi (Herpailurus yagouaroundi), is noteworthy. With the records in this study, we extend the known distribution of the bats Musonycteris harrisoni and Myotis carteri. The great diversity and peculiarity of the found mammals emphasize the importance of conserve forest patches in highly urbanized, also the need of strategies that increment the connectivity between the patches and consider the urban threats, as roadkill’s, in these sites.Key words: Acapulco de Juárez, dry forest, Guerrero, mammals, Omitlan.

scholarly journals Herpetofaunal diversity in a tropical dry forest on the Central Coast of Oaxaca, Mexico

2019 ◽  
Vol 29 ◽  
pp. 1-11
Author(s):  
Jesús García Grajales ◽  
Yolanda López-López ◽  
Alejandra Buenrostro Silva
Keyword(s):  
Conservation Status ◽  
Tropical Dry Forest ◽  
Similarity Index ◽  
Dry Forest ◽  
Central Coast ◽  
Amphibian Species ◽  
Baseline Information ◽  
Threatened Habitats ◽  
High Diversity ◽  
Pueblo Viejo

The dry forest is an ecosystem with a relatively high diversity of species. It is also one of the most threatened habitats. This research was carried out between January and November 2010 aiming to describe species richness, composition, and conservation status of the herpetofauna in the Yerbasanta micro-basin in the Central Coast of Oaxaca. Standard visual encounter surveys were used to observe herpetofaunal community in four locations of the micro-basin. Five amphibian species and 37 reptiles species were found. The Shannon-Wienner index showed that Pueblo Viejo had the highest value of diversity, followed by Unión, and the remainder localities had lower values. The similarity index was moderate between locations. Among the registered species, 12 can be classified under some conservation status. These results also suggest that this region can maintain a significant number of herpetofauna species. Additionally, this research represents baseline information that contributes to other studies.

scholarly journals Effect of fragmentation on the Costa Rican dry forest avifauna

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2422 ◽  
Author(s):  
Gilbert Barrantes ◽  
Diego Ocampo ◽  
José D. Ramírez-Fernández ◽  
Eric J. Fuchs
Keyword(s):  
Tropical Dry Forest ◽  
Bird Community ◽  
Dry Season ◽  
Costa Rican ◽  
Dry Forest ◽  
Forest Fragment ◽  
Avian Community ◽  
Forest Patches ◽  
Species Occupancy ◽  
Avian Assemblages

Deforestation and changes in land use have reduced the tropical dry forest to isolated forest patches in northwestern Costa Rica. We examined the effect of patch area and length of the dry season on nestedness of the entire avian community, forest fragment assemblages, and species occupancy across fragments for the entire native avifauna, and for a subset of forest dependent species. Species richness was independent of both fragment area and distance between fragments. Similarity in bird community composition between patches was related to habitat structure; fragments with similar forest structure have more similar avian assemblages. Size of forest patches influenced nestedness of the bird community and species occupancy, but not nestedness of assemblages across patches in northwestern Costa Rican avifauna. Forest dependent species (species that require large tracts of mature forest) and assemblages of these species were nested within patches ordered by a gradient of seasonality, and only occupancy of species was nested by area of patches. Thus, forest patches with a shorter dry season include more forest dependent species.

scholarly journals A new park in the Bolivian Gran Chaco – an advance in tropical dry forest conservation and community-based management

Oryx ◽  
1997 ◽  
Vol 31 (3) ◽  
pp. 189-198 ◽  
Author(s):  
Andrew Taber ◽  
Gonzalo Navarro ◽  
Miguel Angel Arribas
Keyword(s):  
National Park ◽  
Forest Conservation ◽  
Integrated Management ◽  
Tropical Dry Forest ◽  
Habitat Type ◽  
Dry Forest ◽  
Community Based ◽  
Gran Chaco ◽  
Community Based Conservation ◽  
Management Area

The Kaa-Iya del Gran Chaco National Park and Integrated Management Area was established in September 1995. At 3.44 million hectares it is one of South America's largest protected areas. The tropical dry forest of the Chaco, which this reserve protects, is Bolivia's most threatened major lowland habitat type. With the creation of this reserve the protected-area coverage of the Gran Chaco increased to 4.7 per cent. With at least 69 species of mammals (the Chiroptera have not yet been surveyed), it is one of the richest Neotropical sites for this taxonomic group. The Kaa-Iya park is being administered by the Izoceño-Guaraní Indian organization, the Capitanía del Alto y Bajo Izozog, and puts community-based conservation into practice. Threats to the park include encroachment by colonists, ranchers and farmers; the Bolivia-Brazil gas pipeline; and hunting.

scholarly journals Early successional dynamics of ground beetles (Coleoptera, Carabidae) in the tropical dry forest ecosystem in Colombia

ZooKeys ◽  
2021 ◽  
Vol 1044 ◽  
pp. 877-906 ◽  
Author(s):  
Gloria Maria Ariza ◽  
Jorge Jácome ◽  
Héctor Eduardo Esquivel ◽  
D. Johan Kotze
Keyword(s):  
Tropical Dry Forest ◽  
Canopy Cover ◽  
Abundant Species ◽  
Carabid Beetle ◽  
Dry Forest ◽  
Carabid Beetles ◽  
Individual Species ◽  
Wet Season ◽  
Air Temperatures ◽  
Early Succession

Little is known about the successional dynamics of insects in the highly threatened tropical dry forest (TDF) ecosystem. For the first time, we studied the response of carabid beetles to vegetal succession and seasonality in this ecosystem in Colombia. Carabid beetles were collected from three TDF habitat types in two regions in Colombia: initial successional state (pasture), early succession, and intermediate succession (forest). The surveys were performed monthly for 13 months in one of the regions (Armero) and during two months, one in the dry and one in the wet season, in the other region (Cambao). A set of environmental variables were recorded per month at each site. Twenty-four carabid beetle species were collected during the study. Calosoma alternans and Megacephala affinis were the most abundant species, while most species were of low abundance. Forest and pasture beetle assemblages were distinct, while the early succession assemblage overlapped with these assemblages. Canopy cover, litter depth, and soil and air temperatures were important in structuring the assemblages. Even though seasonality did not affect the carabid beetle assemblage, individual species responded positively to the wet season. It is shown that early successional areas in TDF could potentially act as habitat corridors for species to recolonize forest areas, since these successional areas host a number of species that inhabit forests and pastures. Climatic variation, like the El Niño episode during this study, appears to affect the carabid beetle assemblage negatively, exasperating concerns of this already threatened tropical ecosystem.

scholarly journals Spatial and temporal distribution and microhabitat use of aquatic breeding amphibians (Anura) in a seasonally dry tropical forest in Chamela, Mexico

2017 ◽  
Vol 65 (3) ◽  
pp. 1082 ◽  
Author(s):  
Martha I. Luna-Gómez ◽  
Andrés García ◽  
Georgina Santos-Barrera
Keyword(s):  
Tropical Dry Forest ◽  
Temporal Distribution ◽  
Reproductive Activity ◽  
Abundant Species ◽  
Dry Forest ◽  
Microhabitat Use ◽  
Spatial And Temporal Distribution ◽  
Breeding Sites ◽  
Temporary Streams ◽  
Seasonally Dry

The distribution of amphibians is affected by abiotic and biotic factors, availability of resources and the characteristics of reproductive sites. In particular, reproductive activity of aquatic-breeding anurans that inhabit tropical dry areas is affected by rainfall, which determines the availability and quality of reproductive sites. In this study, we analyzed the spatial and temporal distribution of anurans with indirect development in a tropical dry forest in Western Mexico, during two rainy seasons (July 10-October 4, 2013, and June 26-September 26, 2014). We collected data on the occupancy and reproductive activity of 15 species in four temporary streams, and evaluated their relationship with precipitation, humidity and temperature. We determined richness, abundance and diversity of species in each stream; we also identified differences in the reproductive strategies and microhabitats used by the species. The most abundant species were: Tlalocohyla smithii and Exerodonta smaragdina, whereas the least abundant were Leptodactylus melanonotus and Incilius mazatlanensis. Species richness, abundance and reproductive activity peaked alongside the stream with the greatest number of breeding sites (e.g. pools). We found temporal segregation in the occupancy and reproductive activity of species in all streams which were mainly associated with precipitation. However, occupancy and reproductive activity of some species overlapped up to four weeks during part of the breeding season. Most species used specific substrates for particular reproductive activities (e.g. oviposition), but used a range of microhabitats (leaf-litter, water, rocks, branches, leaves, logs, etc.) for others (e.g. calling). We discuss these behavioral differences as factors that facilitate coexistence of species in this environment in the rainy season.

scholarly journals Edaphic and Seasonal Heterogeneity of Seed Banks in Agricultural Fields of a Tropical Dry Forest Region in Southern Mexico

2012 ◽  
Vol 90 (3) ◽  
pp. 287 ◽  
Author(s):  
Jorge A. Meave ◽  
Claudia Flores-Rodríguez ◽  
Eduardo A. Pérez-García ◽  
Marco Antonio Romero-Romero
Keyword(s):  
Seed Bank ◽  
Tropical Dry Forest ◽  
Abundant Species ◽  
Black Soil ◽  
Seed Banks ◽  
Dry Forest ◽  
Agricultural Fields ◽  
Tropical Region ◽  
Soil Cores ◽  
Southern Mexico

<p class="p1"><span class="s1">The slash-and-burn agriculture practiced across tropical dry regions results in the elimination of native vegetation. Upon field abandonment, the seed bank becomes a potentially important mechanism of natural regeneration at early successional stages. Soil properties and climate seasonality may affect seed bank characteristics, thus we analyzed the effects of these two factors on seed bank density and composition in agricultural fields of a seasonally dry tropical region of southern Mexico. Soil cores were collected for the rainy and the dry seasons in order to assess changes occurring in the seed bank from the time of harvest to the moment when succession could potentially start (the next rainy season). The 12 studied fields comprised three different soil types recognized by local inhabitants: sandy and stony, silty, and clayey soils, locally known as cascajo, black soil, and red soil, respectively. At each fi eld 20 soil cores (8 cm diameter, 4.5 cm depth) were collected and mixed to form four pooled samples, which were placed in a greenhouse to induce germination. A total of 4,422 seedlings (2,291 seeds m<sup>-2</sup>) representing 40 species were recorded. The most abundant species were, in decreasing order, <em>Melanthera nivea</em>, <em>Rhynchelytrum repens</em>, <em>Waltheria indica</em>, <em>Amaranthus scariosus</em>, <em>Digitaria bicornis</em>, and <em>Cenchrus pilosus</em>. Herbs were the prevailing growth form (&gt; 80% of total richness). No clear pattern was observed in the seed bank related to soil type; however, seed bank characteristics tended to be associated with the time of use of the agricultural fields, a variable that was not controlled in the study. Seed bank species richness was significantly larger in the dry season, and although seed density showed a similar trend, it was not significant. The studied seed banks contain no elements of the regional primary tropical dry forest, which suggests that seed banks in deforested areas cannot guarantee their maintenance beyond forested areas.</span></p>

scholarly journals A new park in the Bolivian Gran Chaco – an advance in tropical dry forest conservation and community-based management

Oryx ◽  
1997 ◽  
Vol 31 (03) ◽  
pp. 189 ◽  
Author(s):  
Andrew Taber ◽  
Gonzalo Navarro ◽  
Miguel Angel Arribas
Keyword(s):  
Forest Conservation ◽  
Tropical Dry Forest ◽  
Dry Forest ◽  
Community Based ◽  
Gran Chaco

Post-Fire Regeneration of Woody Species in a Colombian Tropical Dry Forest

2020 ◽  
pp. 324-345
Author(s):  
Anghy Gutiérrez-Rincón ◽  
Angela Parrado-Rosselli
Keyword(s):  
Plant Species ◽  
Forest Fires ◽  
Natural Regeneration ◽  
Tropical Dry Forest ◽  
Woody Species ◽  
Dry Forest ◽  
Forest Sites ◽  
Regeneration Response ◽  
Magdalena River ◽  
In Fire

In fire-influenced ecosystems, some plant species have the ability to recover, germinate, and to establish after a fire; however, their proportion and dominance varies between sites. The objective of this work was to evaluate natural regeneration following a fire in a tropical dry forest located in the Upper Magdalena River Valley in Colombia. In that way, all seedlings and saplings of woody species were recorded, 1.5 years after a fire, in 75 2x2-m plots installed in burned and unburned forest sites, as well as in forest gaps. Results showed that although abundance was higher in the burned sites, the species richness was lower than in unburned areas. Based on the regeneration response of the species, we identified three groups of plants: 1) fire-stimulated, 2) fire-tolerant, and 3) fire-sensitive species, which means that this tropical dry forest has species with the ability to recover, germinate, and establish after a fire. These three groups of plant species should be considered in restoration programs in light of future and more frequent forest fires due to climate change.

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