scholarly journals Distribución potencial y conectividad del paisaje: criterios para reevaluar el grado de amenaza de Campylorhynchus yucatanicus (Aves: Troglodytidae)

2017 ◽  
Vol 65 (4) ◽  
pp. 1554
Author(s):  
Anay Serrano-Rodríguez ◽  
Griselda Escalona Segura ◽  
Alexis H. Plasencia Vázquez ◽  
Eduardo E. Iñigo Elias ◽  
Lorena Ruiz-Montoya
Keyword(s):  
Land Use ◽  
Urban Areas ◽  
Potential Distribution ◽  
Landscape Connectivity ◽  
Yucatan Peninsula ◽  
Distribution Model ◽  
Northern Coast ◽  
Dune Vegetation ◽  
Narrow Strip ◽  
Yucatán Peninsula

Geographic distribution and habitat quality are key criteria for assessing the degree of risk of species extinction threat. Campylorhynchus yucatanicus (Yucatán Wren, Troglodytidae) is an endemic bird of the Northern coast of the Yucatán Peninsula, Mexico, with a distribution restricted to a narrow strip of habitat, between Campeche and Yucatán states. Currently, the Yucatán coast has lost more than half of the coastal dune vegetation, and other habitats have been modified mainly because there is no urban development plan and the natural resources management is poor. These factors threaten C. yucatanicus, which is listed as a near threatened species by IUCN and as an endangered species by Mexican law NOM-059-2010. In this paper, C. yucatanicus´s potential distribution was modeled using 64 presence records from several sources (1960 y 2009), a set of climate variables, and a vegetation index layer of normalized difference (NDVI). To assess the degree of landscape connectivity we used a map of vegetation types and land use, distance to villages and paved roads. The potential distribution model showed an area of approximately 2 711 km2, which is 2 % of the total area of the Yucatán Peninsula distribution. In this area, only 27 % is protected by Biosphere Reserve category and only 10 % belong to core conservation areas, with land use restrictions and relatively effective protection. The populations from Ría Lagartos and Western Celestún regions appear to be the most isolated following the model of landscape connectivity. Landscape permeability among fragments of dune vegetation near the coast is low, mainly due to the distribution of urban areas. These results can be used to establish management strategies, and show that the species is in more delicate conditions than what it has been described by IUCN. We consider that C. yucatanicus should be given endangered category by IUCN, because of their distribution and the context of the current landscape connectivity.

scholarly journals Efecto del sitio de procedencia sobre los atributos de las semillas de Cakile edentula (Brassicaceae), especie estabilizadora de duna costera

2019 ◽  
Vol 97 (1) ◽  
pp. 74 ◽  
Author(s):  
Ricardo Álvarez-Espino ◽  
Gabriela Mendoza-González ◽  
Candelaria Pérez-Martin ◽  
Xavier Chiappa-Carrara
Keyword(s):  
Moisture Content ◽  
Yucatan Peninsula ◽  
Seed Mass ◽  
Coastal Dune ◽  
Northern Coast ◽  
Seed Traits ◽  
Dune Vegetation ◽  
Yucatán Peninsula ◽  
Cakile Edentula ◽  
Study Species

<p><strong>Background</strong>: The morphological traits and germinative behavior of seeds vary within a species in response to multiple factors. Knowledge of this variability is important in understanding adaptation of species to environmental conditions.</p><p><strong>Question</strong>: Does the provenance of seeds of <em>Cakile edentula</em> affect seed traits? Does the climate of the sites of origin of the seeds influence their variability? Does the presence of light affect seed germination?</p><p><strong>Study species</strong>: <em>Cakile edentula</em><em> </em>(Bigelow) Hook.</p><p><strong>Study site</strong>: Coastal dune vegetation on the northern coast of the Yucatan Peninsula in August and October 2017.</p><p><strong>Methods</strong>: Seeds of <em>Cakile edentula</em> were collected in different locations on the northern coast of the Yucatan Peninsula. Under laboratory conditions it was assessed whether the origin of the seeds influenced some traits such as seed mass, moisture content, viability and germinative behavior.</p><p><strong>Results</strong>: Seed provenance significantly affected seed mass and moisture content in <em>C</em>. <em>edentula</em>. Moreover, the seeds of <em>C</em>. <em>edentula</em> collected from hot and humid sites germinate quickly and in greater proportion than the seeds from warm and dry sites of the Yucatan Peninsula. The seeds of <em>C</em>. <em>edentula</em> germinate preferably in darkness, regardless site of provenance.</p><strong>Conclusions</strong>: Some seed traits of <em>C</em>. <em>edentula</em> are affected by the site of provenance. Evidence suggests that climatic variation is likely to influence the initial characteristics of the life history in this coastal dune species.

scholarly journals Estimation of Ecological Connectivity in a City Based on Land Cover and Urban Habitat Maps

2020 ◽  
Vol 12 (22) ◽  
pp. 9529
Author(s):  
Dohee Kim ◽  
Wonhyeop Shin ◽  
Heejoon Choi ◽  
Jihwan Kim ◽  
Youngkeun Song
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Green Infrastructure ◽  
Urban Areas ◽  
Landscape Connectivity ◽  
Urban Habitat ◽  
Ecological Data ◽  
Ecological Connectivity ◽  
Future Work ◽  
The City

Anthropogenic land use has led to the loss and fragmentation of native habitats and disruption to ecosystem processes, resulting in a decline in landscape connectivity and biodiversity. Here, in order to find the potentials of improvements in ecological connectivity, we provide a spatial analysis to present differences in ecological connectivity based on land cover maps and urban habitat maps in Suwon city, Republic of Korea. We generated two permeability maps for use in a network analysis, one being land cover and the other urban habitat, including a 5-km buffer area from the city boundary. We then determined the current-flow betweenness centrality (CFBC) for each map. Our results indicate that forests are typically the most highly connected areas in both maps. However, in the land cover map results, nearly all high-priority areas were in the mountainous region (CFBC value: 0.0100 ± 0.0028), but the urban habitat indicated that grasslands and rivers within the city also significantly contribute to connectivity (CFBC value: 0.0071 ± 0.0022). The CFBC maps developed here could be used as a reference when introducing green infrastructure in cities. Before establishing ecological networks for urban areas, future work should integrate the land use and ecological data of different administrative districts with continuous ecological connection.

scholarly journals Urbanization and Increasing Flood Risk in the Northern Coast of Central Java—Indonesia: An Assessment towards Better Land Use Policy and Flood Management

Land ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 343
Author(s):  
Wiwandari Handayani ◽  
Uchendu Eugene Chigbu ◽  
Iwan Rudiarto ◽  
Intan Hapsari Surya Putri
Keyword(s):  
Land Use ◽  
River Basin ◽  
Spatial Data ◽  
Urban Areas ◽  
Landsat Imagery ◽  
Flood Management ◽  
Spatial Data Analysis ◽  
Northern Coast ◽  
Flood Events ◽  
Central Java

This study explores urbanization and flood events in the northern coast of Central Java with river basin as its unit of analysis. Two types of analysis were applied (i.e., spatial data and non-spatial data analysis) at four river basin areas in Central Java—Indonesia. The spatial analysis is focused on the assessment of LULC change in 2009–2018 based on Landsat Imagery. The non-spatial data (i.e., rural-urban classification and flood events) were overlaid with results of spatial data analyses. Our findings show that urbanization, as indicated by the growth rate of built-up areas, is very significant. Notable exposure to flood has taken place in the urban and potentially urban areas. The emerging discussion indicates that river basins possess dual spatial identity in the urban system (policy- and land-use-related). Proper land use planning and control is an essential instrument to safeguard urban areas (such as the case study area) and the entire island of Java in Indonesia. More attention should be put upon the river basin areas in designing eco-based approach to tackle the urban flood crises. In this case, the role of governance in flood management is crucial.

scholarly journals The relationship between forest fragmentation and the potential geographical distribution of psittacids (Psittaciformes: Psittacidae) in the Yucatan Peninsula, Mexico

2017 ◽  
Vol 65 (4) ◽  
pp. 1470
Author(s):  
Alexis Herminio Plasencia Vázquez ◽  
Griselda Escalona Segura ◽  
Yarelys Ferrer Sánchez
Keyword(s):  
Geographical Distribution ◽  
Forest Fragmentation ◽  
Potential Distribution ◽  
Yucatan Peninsula ◽  
Quintana Roo ◽  
Distribution Area ◽  
Yucatán Peninsula ◽  
Amazona Oratrix ◽  
The Mean ◽  
The Relationship

Parrots are a seriously threatened group because of the illegal pet trade, their habitat fragmentation and the destruction of tropical forests. This study aimed to determine the relationship between forest fragmentation and the geographic potential distribution of parrot species in the Yucatan Peninsula, Mexico. The research was carried out in the Mexican portion of the Yucatan Peninsula Biotic region, which includes the states of Campeche, Quintana Roo and Yucatan. We worked with the eight species of psittacids that inhabit the selected areas: Eupsittula nana, Amazona albifrons, Amazona xantholora, Amazona autumnalis, Pionus senilis, Pyrilia haematotis, Amazona oratrix and Amazona farinosa. For these species, we used the potential geographical distribution maps that were obtained through the Maximum Entropy algorithm, published in 2014. To measure the levels of forest fragmentation in the Peninsula, we employed the land use and vegetation maps from series IV (2007-2010) of the National Institute of Statistics and Geography. We calculated different landscape metrics at 100 sites randomly distributed within the predicted presence and absence areas for the species. Multivariate methods were used to shorten dimensionality in the analysis, as well as to explore the observed patterns. We did not find any pattern regarding the number of variables that contribute to the logistic regression models (LR) and the size of the parrots’ potential geographical distribution area within the Peninsula. For Pyrilia haematotis and Amazona oratrix, the fragmentation variables used did not seem to have any relationship with their potential geographical distribution in the Peninsula (intersection, Pr < 0.0001). Only for Eupsittula nana, Amazona xantholora and Pionus senilis, we found that the mean patch edge, the mean shape index and the mean perimeter-area ratio were important to determine their potential distribution patterns, respectively; and, in general, the variables indicated the preferences of these parrots to occupy larger habitat patches. Parrots must be given a special care and protection within the states of Campeche and Quintana Roo, since there are areas with high parrot diversity and are importantly affected by human activities. The best recommendation for managers and users of protected areas within the Yucatan Peninsula is that extensive areas of forest should be maintained in order to guarantee the suvival of psittacid populations.

scholarly journals Reproductive biology of the southern pufferfish, Sphoeroides nephelus (Actinopterygii: Tetraodontiformes: Tetraodontidae), in the northern coast off the Yucatan Peninsula, Mexico

2019 ◽  
Vol 49 (2) ◽  
pp. 133-146
Author(s):  
Jorge Peniche Perez ◽  
Carlos Gonzalez Salas ◽  
Harold Villegas Hernández ◽  
Raul Diaz Gamboa ◽  
Alfonso Aguilar Perera ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
Yucatan Peninsula ◽  
Northern Coast ◽  
Yucatán Peninsula

State of knowledge and updated distribution of the northern naked-tailed armadillo Cabassous centralis Miller, 1899 (Cingulata, Chlamyphoridae)

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Julio Chacón-Pacheco ◽  
Camilo Ramos Madera ◽  
Mariella Superina
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Rare Species ◽  
Potential Distribution ◽  
Conservation Status ◽  
Distribution Model ◽  
The Andes ◽  
Secondary Vegetation ◽  
Online Databases ◽  
Data Deficient

Abstract The northern naked-tailed armadillo (Cabassous centralis) is a small, poorly known armadillo species. We update the state of knowledge on this species, provide information on its current and potential distribution, and assess its conservation status and threats. We reviewed the existing literature and obtained georeferenced records from publications, online databases, and field researchers. A total of 174 documents mentioning C. centralis have been published between 1855 and 2019, about half of which (83) provided information on its distribution. The majority of publications came from Colombia. About 10% of publications included information about its ecology, concluding that it is a rare species that mainly occurs in areas with secondary vegetation. It seems to prefer complex habitats, as it is rarely found in fragmented or modified habitats. Consequently, it is possible that its ability to adapt to land use change is low. A total of 224 confirmed records allowed us to extend the species range to the northern Lacandona Forest in Mexico, the Andes of Colombia and southwards in Ecuador. Nevertheless, a distribution model suggests that the species could be even more widely distributed. C. centralis is listed in a threatened category in two countries, whereas more than half of the range countries have not assessed its conservation status. We consider its current global listing as Data Deficient to be appropriate, as many aspects of its ecology, reproduction, population size and trend, and the degree of impact of potential threats remain unknown.

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