scholarly journals Temporal changes in the potential geographic distribution of Histiotus velatus (Chiroptera, Vespertilionidae), the “decade effect”

2021 ◽  
Author(s):  
Liriann Chrisley Da Silva ◽  
Rafaela Almeida ◽  
Pablo Silva ◽  
Monik Oprea ◽  
Poliana Mendes ◽  
...  
Keyword(s):  
Potential Distribution ◽  
Euclidean Distance ◽  
New Records ◽  
Support Vector ◽  
Research Centers ◽  
Bioclimatic Variables ◽  
Geographic Knowledge ◽  
Southeastern Region ◽  
Occurrence Records ◽  
Occurrence Of Species

Also investigate how the potential distribution of this species changes with the addition of new records over the decades (decade effect). Assuming that (1: hypothesis of the effect of the decade) the addition of new occurrence records over time increases the potential size of the species distribution; and (2: Wallacean distance hypothesis) over the years, the new points added are increasingly distant from the research centers. Considering the geographic knowledge gap of Histiotu velatus, our objective is to report a new record of this species and estimate its potential distribution in South America through ENMs. For this, we compiled records of occurrence of species, selected from 1900 to 2015. We used 19 bioclimatic variables available in the WorldCLim database to estimate the potential distribution of the species and we used three modeling algorithms: Maximum Entropy (MXT) Random Forest (RDF) and Support Vector Machine (SVM). We selected the main bat research centers in Brazil, using the Lattes platform for the Wallacean distance hypothesis, using the Euclidean distance calculation. To test the hypothesis of the decade effect, we used beta regression analysis, taking conservative and non-conservative approaches. The results showed that the predicted area expanded and retracted over the decades, with an improvement in the accuracy of the models with the addition of new data. Most of the records are located in the southeastern region of Brazil, but the algorithms predicted areas in countries where there were no records. Only the conservatism approach has had a positive relationship over the decades. The distance from new points does not increase over the years of research centers.

scholarly journals Modeling potential distribution of Baccaurea macrocarpa in South Kalimantan, Indonesia

2021 ◽  
Vol 22 (8) ◽  
Author(s):  
Gunawan Gunawan ◽  
Muhammad Ikhwan Rizki ◽  
Olivia Anafarida ◽  
Nurul Mahmudah
Keyword(s):  
Solar Radiation ◽  
Potential Distribution ◽  
Maxent Model ◽  
Potential Source ◽  
Bioclimatic Variables ◽  
Auc Value ◽  
Predicted Model ◽  
Random Method ◽  
Better Than ◽  
Occurrence Records

Abstract. Gunawan, Rizki MI, Anafarida O, Mahmudah N. 2021. Modeling potential distribution of Baccaurea macrocarpa in South Kalimantan, Indonesia. Biodiversitas 22: 3230-3236. Baccaurea macrocarpa is fruit tree that has a potential source of food and medicine. However, little is known about the occurrences and potential distribution of B. macrocarpa mainly in South Kalimantan. This study is the first to predict the distribution of B. macrocarpa in South Kalimantan using maximum entropy (MaxEnt). Modeling included 102 occurrence records with 19 bioclimatic variables, solar radiation, altitude, and slope. Temperature, solar radiation, and precipitation were the key environmental factor influencing the distribution of B. macrocarpa. The district of HS (Hulu Sungai Selatan), HT (Hulu Sungai Tengah), HU (Hulu Sungai Utara), BL (Balangan), and TG (Tabalong) were predicted as highly suitable areas (IHS 0.6-1) for this species. The MaxEnt model performed better than the random method with an Area Under Curve (AUC) value of 0.817, indicating that the model is good and informative model for habitat suitability of B. macrocarpa. The predicted model we presented here can help habitat conservation, biodiversity conservation planning and monitoring, and cultivation in the future for B. macrocarpa.

New records of Gymnopogon doellii (Poaceae, Chloridoideae, Cynodonteae, Hubbardochloinae), a Brazilian endangered species

Phytotaxa ◽  
2020 ◽  
Vol 435 (1) ◽  
pp. 57-62
Author(s):  
RONALDO VINÍCIUS-SILVA ◽  
CLÁUDIO COELHO DE PAULA ◽  
DIOGO FELCAR SARAIVA
Keyword(s):  
Leaf Blade ◽  
New Records ◽  
Federal District ◽  
Minas Gerais ◽  
Distribution Map ◽  
Campos Rupestres ◽  
Native Grass ◽  
Minas Gerais State ◽  
Southeastern Region ◽  
Occurrence Records

We report new occurrence records of Gymnopogon doellii in Brazil, based on collections from the Ferruginous Campos Rupestres (rocky outcrops) of Minas Gerais state, in the southeastern region of the country. This native grass had been previously reported in Brazil only from Cerrado areas of Minas Gerais and Goiás states and the Federal District. According to the IUCN criteria, the species is endangered. Within the genus, G. doellii is distinguished by having short rhizomes, indistinct leaf blade midveins, ligules with a fringe of hairs and acuminate glumes twice the size of the floret. We provide photographs of individuals in the field, an illustration with details of the species morphology and an updated geographic distribution map.

scholarly journals Flora vascular da Serra da Pedra Branca, Caldas, Minas Gerais e relações florísticas com áreas de altitude da Região Sudeste do Brasil

2013 ◽  
Vol 13 (4) ◽  
pp. 201-224 ◽  
Author(s):  
Munike Gonçalves de Rezende ◽  
Ricardo Cunha Loyola Elias ◽  
Fátima Regina Gonçalves Salimena ◽  
Luiz Menini Neto
Keyword(s):  
New Records ◽  
Vascular Plant ◽  
Montane Forest ◽  
Minas Gerais ◽  
The State ◽  
Mountain Range ◽  
Floristic Similarity ◽  
Floristic Survey ◽  
Ombrophilous Forest ◽  
Southeastern Region

Serra da Pedra Branca (SPB) is a mountain range located in the Southwestern portion of the state Minas Gerais, in the municipality of Caldas (21°58′-21°55′S, 46°24′-46°22′W). It is a striking feature in the landscape, between 1100 and 1780 m.s.m., in a region that is part of the Atlantic Forest Domain and is considered as a priority area for conservation of the flora in Minas Gerais state. The vegetation is composed by a mosaic of “campo de altitude” (which occupy the greatest extension in the area), Seasonal Semidecidual Montane Forest, Dense Ombrophilous High-Montane Forest and Mixed Ombrophilous Forest. The aims of this study was the elaboration of a floristic survey of SPB added to the specimens collected by Anders Fredrik Regnell in the nineteenth century in Caldas and to analyze its floristic similarity with altitude areas of the Southeastern Region of Brazil. There were recorded 502 vascular plant species, distributed in 274 genera and 100 families. The majority of recorded species present herbaceous habit, terricolous, saxicolous and/or rupicolous (representing around 58% of recorded species), predominantly occurring in the “campo de altitude” (ca. 46%). The richest families were Polypodiaceae (20 spp.) and Dryopteridaceae (10 spp.) among the ferns, and Orchidaceae (56 spp.), Asteraceae (27 spp.) and Fabaceae (26 spp.) among the angiosperms. Just one species of gymnosperm was recorded, Araucaria angustifolia (Bertol.) Kuntze (Araucariaceae). Five new records were made for the Minas Gerais flora, 13 species are cited as threatened with extinction in the state and at least six are endemic to SPB. Amongst 127 species collected in XIX century in the region, only 29 collected again, while 375 new records were made for SPB. The analysis of floristic similarity performed between the flora of SPB and other altitude areas of Southeastern Region revealed isolation of SPB in relation to other areas, highlighting its floristic peculiarity, which can probably be explained by its location in a distinct hydrographic basin. The vegetation of the SPB must be considered as endangered since the presence of endemic species and/or threatened species, associated with local environmental conditions suffering accelerated rate of destruction, highlight the need for urgent actions to preserve local biodiversity.

scholarly journals A novel feature selection algorithm based on damping oscillation theory

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0255307
Author(s):  
Fujun Wang ◽  
Xing Wang
Keyword(s):  
Feature Selection ◽  
Optimization Algorithm ◽  
Euclidean Distance ◽  
Oscillation Theory ◽  
Feature Subset Selection ◽  
Support Vector ◽  
Data Sets ◽  
Feature Subset ◽  
Selection Algorithm ◽  
Filter Model

Feature selection is an important task in big data analysis and information retrieval processing. It reduces the number of features by removing noise, extraneous data. In this paper, one feature subset selection algorithm based on damping oscillation theory and support vector machine classifier is proposed. This algorithm is called the Maximum Kendall coefficient Maximum Euclidean Distance Improved Gray Wolf Optimization algorithm (MKMDIGWO). In MKMDIGWO, first, a filter model based on Kendall coefficient and Euclidean distance is proposed, which is used to measure the correlation and redundancy of the candidate feature subset. Second, the wrapper model is an improved grey wolf optimization algorithm, in which its position update formula has been improved in order to achieve optimal results. Third, the filter model and the wrapper model are dynamically adjusted by the damping oscillation theory to achieve the effect of finding an optimal feature subset. Therefore, MKMDIGWO achieves both the efficiency of the filter model and the high precision of the wrapper model. Experimental results on five UCI public data sets and two microarray data sets have demonstrated the higher classification accuracy of the MKMDIGWO algorithm than that of other four state-of-the-art algorithms. The maximum ACC value of the MKMDIGWO algorithm is at least 0.5% higher than other algorithms on 10 data sets.

DIVERSITY AND DISTRIBUTION OF NIGERIAN LEGUMES (FABACEAE)

Phytotaxa ◽  
2021 ◽  
Vol 480 (2) ◽  
pp. 103-124
Author(s):  
ABUBAKAR BELLO ◽  
FATIMA BATUL MUKHTAR ◽  
ALEXANDRA NORA MUELLNER-RIEHL
Keyword(s):  
Conservation Planning ◽  
New Records ◽  
Distribution Patterns ◽  
Northern Nigeria ◽  
Growth Forms ◽  
Tropical Africa ◽  
Savanna Vegetation ◽  
Herbarium Collections ◽  
West Tropical Africa ◽  
Occurrence Records

This study provides the first comprehensive checklist and analysis of the species of Fabaceae from Nigeria, based on over 5000 herbarium collections and the completed "Flora of West Tropical Africa (FWTA)". We report 552 taxa, belonging to 540 species in 155 genera from six subfamilies, with an outstanding number of taxa (36) representing new records for the country. We mapped the distribution of the species using their occurrence records obtained from GBIF and our own field and herbarium collections. The majority of taxa (43%) was distributed in the savanna vegetation of northern Nigeria, followed by the adjacent tropical forest formations of southern Nigeria (34%), and they were found in highest percentages in Papilionoideae (67%) and Caesalpinioideae (19%), followed by Deterioideae (11%), Cercidoideae and Dialioideae (6% each) and Duparquetioideae (<1%) subfamilies. Endemic and native taxa were 5 and 73% respectively. The most prevalent subfamilies in terms of endemicity were Papilionoideae (14 species), and Deterioideae (11 species), while the most prevalent genera were Indigofera (three species), Dalbergia (three species), Brachystegia (two species) and Cryptosepalum (two species). We found that the majority (37%) of the species were phanerophytes and the fewest were cryptophytes (0.7%). These results suggest that Nigeria has a considerable diversity of legumes, with a predominant distribution in the savanna, probably due to the demanding environmental conditions limiting the dispersion of generalists or invasive species. The diversity of growth forms and distribution patterns of Nigerian legumes could be useful in screening these plants for other potential uses, such as conservation planning or specific agricultural purposes. We recommend a similar study on other families as this will help locals, natural scientists, governments and conservation bodies to recognise and appreciate the flora of the country.

Polychaetes from Santa Catarina State (southern Brazil): checklist and remarks on species distribution

Zootaxa ◽  
2012 ◽  
Vol 3486 (1) ◽  
pp. 1 ◽  
Author(s):  
PAULO ROBERTO PAGLIOSA ◽  
JOÃO GABRIEL DORIA ◽  
GIORGIA FREITAS ALVES ◽  
TITO CESAR MARQUES DE ALMEIDA ◽  
LUCIANO LORENZI ◽  
...  
Keyword(s):  
Species Distribution ◽  
New Records ◽  
Progressive Increase ◽  
Water Masses ◽  
Valid Species ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Rarefaction Curves ◽  
Occurrence Of Species ◽  
Santa Catarina State

This study summarizes taxonomic information on polychaetes from Santa Catarina State, southern Brazil, between25º57'S and 29º23'S, and provides species distribution records together with information on habitats, based on historicaldata and novel records from primary surveys. Rarefaction curves showed that most species were found in the shallowsublittoral (to 60 m) rather than in deep sublittoral (>60 m) or estuarine habitats. Altogether, 228 valid species belongingto 141 genera and 44 families were recorded. This inventory adds 141 new records to previous regional reports. We founda shift in occurrence of species when comparing data from the study area with data from both southward (29–33º S) andnorthward (23–26º S) sites. Few species were shared between consecutive sites: this could be a response to the regionalbehaviour of the atmosphere and water masses, with a progressive increase in the influence of subantarctic waters and a decrease in the influence of subtropical waters.

scholarly journals Kalanchoe(Crassulaceae) as invasive aliens in China - new records, and actual and potential distribution

2016 ◽  
Vol 34 (3) ◽  
pp. 349-354 ◽  
Author(s):  
Zhi-Qiang Wang ◽  
Daniel Guillot ◽  
Ming-Xun Ren ◽  
Jordi López-Pujol
Keyword(s):  
Potential Distribution ◽  
New Records

scholarly journals Anopheles spp. distribution and climatological niche modeling to predict malaria potential along bioclimatic envelope gradients in South Coast of West Java landscape

2021 ◽  
Author(s):  
Andri Wibowo
Keyword(s):  
Habitat Suitability ◽  
Potential Distribution ◽  
Health Planning ◽  
Public Health Problem ◽  
South Coast ◽  
Major Public Health Problem ◽  
West Java ◽  
Novel Approach ◽  
Bioclimatic Variables ◽  
Bioclimatic Envelope

AbstractMalaria remains a major public health problem mainly in particular South East Asian countries. As malaria transmission and Anopheles spp. continues to spread, control interventions should emphasize on the ability to define potential areas that can favor Anopheles spp. distribution. Then there is an urgent need to use novel approach capable to predict potential spatial patterns of Anopheles spp. and delineate malaria potential hotspots for better environmental health planning and management. Here, this study modeled Anopheles spp. potential distribution as a function of 15 bioclimatic variables using Species Distribution Modeling (SDM) in South Coast of West Java Province spans over 20 km from West to East. Findings of this study show that bioclimatic variables and SDM can be used to predict Anopheles spp. habitat suitability, suggesting the possibility of developing models for malaria early warning based on habitat suitability model. The resulting model shows that the potential distributions of Anopheles spp. encompassed areas from West to Central parts of the coasts, with Central parts were the most potential prevalence areas of Anopheles spp. considering this area has higher precipitation. The less potential prevalence areas of Anopheles spp. were observed in the East parts of the coast. The model also shows that inland areas adjacent to the settlements were more potential in comparison to the areas near coast and in the beach. Land cover conditions dominated by cropland, herbaceous wetland, and inundated land were also influencing the Anopheles spp. potential distribution.

scholarly journals New occurrence records for stygobiontic invertebrates from the Edwards and Trinity aquifers in west-central Texas, USA

2018 ◽  
Vol 28 ◽  
pp. 1-13 ◽  
Author(s):  
Bradley D. Nissen ◽  
Thomas J. Devitt ◽  
Nathan F. Bendik ◽  
Andrew G. Gluesenkamp ◽  
Randy Gibson
Keyword(s):  
New Records ◽  
Undescribed Species ◽  
West Central ◽  
Central Texas ◽  
Occurrence Records

We report new occurrence records for stygobiontic invertebrates from the Edwards and Trinity aquifers in Blanco, Hays, and Travis counties of central Texas, USA. Our collection includes seven species from four families: Caecidoteareddelli (Steeves, 1968), Asellidae; Crangonyxnr.pseudogracilis Bousfield, 1958, Stygobromusbalconis (Hubricht, 1943), Stygobromusbifurcatus (Holsinger, 1967), and Stygobromusrusselli (Holsinger, 1967), Crangonyctidae; Sphalloplanamohri Hyman, 1938, Kenkiidae; and Cirolanides sp., Cirolanidae. Specimens of Caecidoteareddelli and Crangonyxnr.pseudogracilis are new records for Hays County and Travis county, respectively. Specimens of an undescribed species of Cirolanides were collected from a well in Hays County and from two localities in Travis County.

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