scholarly journals ECOLOGICAL NICHE MODELLING OF HIMALAYAN LANGUR (Semnopithecus entellus) IN SOUTHERN FLANK OF THE HIMALAYA

2018 ◽  
Vol 23 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Laxman Khanal ◽  
Mukesh Kumar Chalise ◽  
Xuelong Jiang
Keyword(s):  
River Basin ◽  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
Population Census ◽  
Niche Modelling ◽  
Semnopithecus Entellus ◽  
Wide Range ◽  
Southern Flank ◽  
The Himalaya

 The species and subspecies status of various populations of the Himalayan langur (Semnopithecus entellus) have been disputed in many literatures. Before delineating the taxonomic boundaries, it is important to identify the potential distribution areas of extant populations of the species. Ecological niche modeling (ENM) can be coupled with the systematic survey of species presence to identify the species’ potential distribution range. Therefore, we did extensive survey and population census of the Himalayan langur across three major river basins (Koshi, Gandaki and Karnali) of Nepal and analyzed the population patterns. In addition, we also modelled the ecological niche of the species by using maximum entropy (MaxEnt) algorithm. We counted a total of 559 individuals from 33 troops that accounted the average troop size of 16.94 (±8.39) individuals. Within Nepal territory, the highest population of langurs was observed from the Gandaki River basin followed by the Karnali River basin. We revealed that Himalayan langurs have a wide range of altitudinal (49 m - 4190 m above sea level) distributions from Bhutan to Kashmir across southern flank of the Himalaya. We warrant for the detail distribution assessment and taxonomic analysis of Himalayan langurs using ecological, morphological and genetic variables.

Ecological niche modeling of coastal dune plants and future potential distribution in response to climate change and sea level rise

2013 ◽  
Vol 19 (8) ◽  
pp. 2524-2535 ◽  
Author(s):  
Gabriela Mendoza-González ◽  
M. Luisa Martínez ◽  
Octavio R. Rojas-Soto ◽  
Gabriela Vázquez ◽  
Juan B. Gallego-Fernández
Keyword(s):  
Climate Change ◽  
Sea Level Rise ◽  
Sea Level ◽  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
Niche Modeling ◽  
Coastal Dune Plants ◽  
Future Potential ◽  
Dune Plants

scholarly journals Occurrence of Cabassous tatouay (Cingulata, Dasypodidae) in Rio Grande do Sul and its potential distribution in southern Brazil

2015 ◽  
Vol 105 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Stefan V. de Oliveira ◽  
Luiz L. C. Corrêa ◽  
Felipe B. Peters ◽  
Fábio D. Mazim ◽  
Felipe M. Garcias ◽  
...  
Keyword(s):  
South America ◽  
Rare Species ◽  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
Rio Grande ◽  
Niche Modeling ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Southern South America

ABSTRACT Cabossous tatouay Desmarest, 1804 is considered a rare species in southern South America, and Rio Grande do Sul State, Brazil, records of the species are scarce and inaccurate. This study reports 40 localities for C. tatouay, and provides a map of the species' potential distribution using ecological niche modeling (ENM). The ENM indicated that in this region C. tatouay is associated with open grasslands, including the areas of "Pampas" and the open fields in the highlands of the Atlantic Forest. This study contributes to the information about the greater naked-tailed armadillo in southern Brazil, and provides data key to its future conservation.

scholarly journals Potential distribution and conservation of the Colobosauroides carvalhoi Soares and Caramaschi, 1998: a rare and endemic lizard of Northeast Brazil

2017 ◽  
Vol 77 (4) ◽  
pp. 686-695 ◽  
Author(s):  
A. J. C. Magalhães-Júnior ◽  
G. J. B. Moura ◽  
L. B. Ribeiro ◽  
S. M. Azevedo-Júnior
Keyword(s):  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
Conservation Status ◽  
Distribution Patterns ◽  
Ecological Niche Model ◽  
Niche Model ◽  
Species Population ◽  
Surrounding Areas ◽  
Occurrence Records

Abstract Ecological niche modeling has contributed to the investigation of the geographical distribution and conservation of rare or little recorded species. Therefore, we studied the known and potential distributions of Colobosauroides carvalhoi Soares and Caramaschi 1998 and discuss the implications for its conservation. Data were obtained by manual collections made in quarterly samplings in three different regions, considering the regions with occurrence records and surrounding areas. The known distribution was determined by occurrence records and literature data, and potential distribution was estimated with an ecological niche model by the MaxEnt algorithm. Twenty-five specimens were collected exclusively in forest formations of Caatinga and Caatinga-Cerrado. Our data corroborated the relative rarity of C. carvalhoi and reflected the biogeographical history of the group, where it is restricted to forest formations with milder environmental conditions. The occurrence records indicated new records of C. carvalhoi, but the known distribution value is compatible with a restricted distribution. The ecological niche model estimated few areas with environmental suitability for the species and corroborated the restricted and relict distribution patterns. Finally, the known and potential distribution values were compatible with criteria for threatened species. These results suggest a worrisome scenario for C. carvalhoi conservation. However, the limited data about the species population do not allow the proper definition of its conservation status. Therefore, we suggest using potential distribution values with alternative criteria for redefining the conservation status of C. carvalhoi and the development of new studies that support a better assessment of its conservation aspects.

scholarly journals Progressively approaching the distribution of Passiflora ischnoclada (Passifloraceae) from a single occurrence record

Check List ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1717
Author(s):  
Renato De Giovanni ◽  
Luís Carlos Bernacci
Keyword(s):  
Ecological Niche ◽  
Potential Distribution ◽  
New Records ◽  
Field Work ◽  
Model Ensemble ◽  
Niche Modelling ◽  
Distribution Models ◽  
Guide Field ◽  
Real Distribution ◽  
Modelling Techniques

Until recently, Passiflora ischnoclada was only known from a single occurrence record. In this paper we describe how different ecological niche modelling techniques were successively used to generate better potential distribution models for the species and guide field work. At each step, new records were found until the species’ real distribution was approximated based on a model ensemble created with five different algorithms. The estimated distribution is concentrated on a single area of 84 km2 where the species is considered endangered.

scholarly journals Factores biogeográficos y cambios de uso del suelo (2009-2013) en el nicho de "Trogon elegans ambiguus" y "Euptilotis neoxenus" en Chihuahua, México

2018 ◽  
Vol 44 (2) ◽  
pp. 763
Author(s):  
M.E. Torres-Olave ◽  
L.C. Bravo-Peña ◽  
L.C. Alatorre-Cejudo ◽  
M.I. Uc-Campos ◽  
M.O. González-León
Keyword(s):  
Land Use ◽  
Vegetation Dynamics ◽  
Ecological Niche ◽  
Potential Distribution ◽  
Plant Cover ◽  
Land Use Changes ◽  
Hardwood Forests ◽  
Ecological Niches ◽  
Niche Modelling ◽  
Current State

Few studies have addressed the current state of the Trogon elegans ambiguus and Euptilotis neoxenus ecological niches, as well as the vegetation dynamics and land use changes where these birds live. This work estimates the potential distribution of Trogon elegans ambiguus and Euptilotis neoxenus in Chihuahua and studies the land use changes in two time periods (2009 and 2015). The MaxEnt software was used to model the ecological niches in Chihuahua, Mexico. The maps of changes in land use and plant cover were reclassified and the classes were homogenized. A crosstab analysis was used to compare correspondence matrices. The results indicate that Trogon elegans ambiguus and Euptilotis neoxenus underwent a niche loss in conifer and hardwood forests, which became farmland or pasture-bushes. Ecological niche modelling is a useful tool to identify suitable areas for species with NOM-059-SEMARNAT-2010 status. In the case of Trogon elegans ambiguus, land use changes mainly affect the municipalities of Temosachi and Madera.

scholarly journals Predicting potential distribution and evaluating biotic interactions of threatened species: a case study of Discocactus ferricola (Cactaceae)

2022 ◽  
Vol 22 (1) ◽  
Author(s):  
Luciana Vicente-Silva ◽  
Gabriel Paganini Faggioni ◽  
Gecele Matos Paggi
Keyword(s):  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
In Situ Conservation ◽  
Biotic Interactions ◽  
Niche Modeling ◽  
Ecological Data ◽  
Mato Grosso ◽  
Threat Status ◽  
Conservation Actions

Abstract: Information on distribution, number of populations, and biotic interactions are essential for assessing the threat status of species and to establish more effective conservation initiatives. Ecological niche modeling have been successfully applied to identify the potential distribution, even for rare species that have few recorded occurrence points. In this study, we evaluated the potential distribution and additionally generated the first data on the reproductive biology of Discocactus ferricola, due to its degree of threat and the absence of ecological data for that species. The potential distribution map highlighted areas with higher probability of occurrence of D. ferricola on the Residual Plateau of Maciço do Urucum located in Mato Grosso do Sul, Brazil. The occurrence of D. ferricola populations was limited to outcrops of flat ironstone (cangas) distributed in patches across the landscape, increasing the chances of serious threats, such as habitat loss due to mining and species extraction. We also found that D. ferricola is xenogamous. Therefore, in situ conservation actions must prioritize the maintenance of interactions with pollinators by preserving the flora and fauna of rocky outcrops and adjacent forests in areas of greater environmental suitability for D. ferricola. Our study highlights the use of ecological niche modeling and data on biotic interactions to evaluate species potential distribution, to guide new sampling efforts, and to assist conservation and management initiatives.

scholarly journals Using Ecological Niche Modeling For Biodiversity Conservation Guidance In The Western Podillya (Ukraine): Amphibians

2015 ◽  
Vol 49 (2) ◽  
pp. 135-144 ◽  
Author(s):  
V. Tytar ◽  
S. Mezhzherin ◽  
L. Sobolenko
Keyword(s):  
Habitat Suitability ◽  
Ecological Niche ◽  
Potential Distribution ◽  
Ecological Niche Modeling ◽  
Niche Modeling ◽  
Amphibian Species ◽  
Potential Habitat ◽  
Human Footprint ◽  
Bombina Variegata ◽  
The Mean

Abstract Maximum entropy niche modeling was employed as a tool to assess potential habitat suitability for 13 amphibian species and to map their potential distribution in the Western Podillya (Ukraine). The predictor variables used were of climate, topography and human impact (assessed by the Human Footprint). The “mean temperature of coldest quarter” and “isothermality” were two of the most important factors in predicting habitat suitability and distribution. Another profound contribution has been displayed by the Human Footprint, meaning that human infrastructure may benefit amphibians, a phenomenon that perhaps is much more widespread than thought. Areas have been distinguished that in the first place should be of interest to nature conservationists targeting amphibians (exemplified by Bombina variegata) and a map summarizing species richness was produced.

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