scholarly journals Daytime habitat use and abundance of a freshwater shrimp Macrobrachium yui Holthuis, 1950 (Decapoda: Palaemonidae) in tropical forest stream, northern Laos

2021 ◽  
Vol 50 (0) ◽  
pp. 151-163
Author(s):  
Aloun Kounthongbang ◽  
Pany Souliyamath ◽  
Phonenaphet Chanthasone ◽  
Phutsamone Phommachan ◽  
Oulaytham Lasasimma ◽  
...  
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Freshwater Shrimp ◽  
Forest Stream

scholarly journals Habitat use of jaguar (Panthera onca) in a tropical forest in northern Quintana Roo, Mexico

2019 ◽  
Vol 90 (0) ◽  
Author(s):  
Dulce María Ávila-Nájera ◽  
Marco Antonio Lazcano-Barrero ◽  
Cuauhtémoc Chávez ◽  
Sergio Pérez-Elizalde ◽  
Barbara Tigar ◽  
...  
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Quintana Roo ◽  
Panthera Onca

scholarly journals Coexistence of jaguars (Panthera onca) and pumas (Puma concolor) in a tropical forest in south–eastern Mexico

2020 ◽  
pp. 55-66
Author(s):  
D. M. Ávila–Nájera ◽  
C. Chávez ◽  
S. Pérez–Elizalde ◽  
J. Palacios–Pérez ◽  
B. Tigar
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Puma Concolor ◽  
Yucatan Peninsula ◽  
Activity Patterns ◽  
Time Of Day ◽  
Peak Activity ◽  
Occupancy Models ◽  
Panthera Onca ◽  
Yucatán Peninsula

The biological ranges of the jaguar (Panthera onca) and puma (Puma concolor) overlap in the Yucatan Peninsula, corresponding to the most important population of jaguars in Mexico. The goal of this study in the El Eden Ecological Reserve (EER) was to investigate the factors that permit these two predators to coexist in the dense vegetation of medium–stature tropical forest and secondary forest in the north–eastern Yucatan Peninsula. We assessed their spatial and temporal overlap using Pianka’s index, and evaluated their habitat use by applying occupancy models. A total sampling effort of 7,159 trap–nights over 4 years produced 142 independent photographic records of jaguars, and 134 of pumas. The felids showed high to very high overlap in their use of different vegetation (0.68–0.99) and trail types (0.63–0.97) and in their activity patterns (0.81–0.90). However, their peak activity patterns showed some temporal separation. Time of day, particularly for peak activity time, was the best predictor to explain the coexistence of the felids in this habitat. While occupancy models showed that the presence of potential prey species and vegetation type could predict the presence of felids in the study area. Natural disturbances during 2010 (hurricane) and 2011 (fire) drastically changed habitat use and activity patterns, resulting in pumas and jaguars adjusting their resource–use and activity pattern through a strategy of mutual evasion.

Resource use by the two-toed sloth (Choloepus hoffmanni) and the three-toed sloth (Bradypus variegatus) differs in a shade-grown agro-ecosystem

2014 ◽  
Vol 31 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Jorge E. Mendoza ◽  
M. Zachariah Peery ◽  
Gustavo A. Gutiérrez ◽  
Geovanny Herrera ◽  
Jonathan N. Pauli
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Spatial Scale ◽  
Resource Use ◽  
Tree Species ◽  
Habitat Type ◽  
Population Viability ◽  
Resource Specialization ◽  
Bradypus Variegatus

Abstract:Although resource specialization occurs along a continuum, species are often defined as either specialists or generalists. In general, specialists are more prone to extinction than generalists and, thus, are often the first species to be lost when habitats are modified. The two-toed sloth (Choloepus hoffmanni) and the three-toed sloth (Bradypus variegatus) are arboreal herbivores distributed across the Neotropics. The two-toed sloth is considered a generalist while the three-toed sloth is more specialized. Both species inhabit shade-grown agro-ecosystems but, at least at one study site, only the two-toed sloth was viable. To quantify specialization in sloth species and explore how it influences population viability, we characterized the resource use for 68 adult and 12 subadult sloths across 3 y. The two-toed sloth used 14 tree species relatively uniformly across habitats, while the three-toed sloth largely depended on only two species of tree regardless of habitat type. Both species selected for patches of intact tropical forest, strongly avoided monocultures regardless of spatial scale and generally used cocoa similarly in proportion to availability. However, the sloth species differed in their use of cattle pastures, with the two-toed sloth selecting for pastures and the three-toed sloth avoiding them. Overall, the two-toed sloth exhibited greater plasticity in tree and habitat use, which is likely contributing to its enhanced resilience within this modified agro-ecosystem.

scholarly journals Population Studies of Deer (Odocoileus virginianus, Mazama americana) in Southern Yucatán, Mexico

2021 ◽  
pp. 38-51
Author(s):  
Montes-Perez Ruben ◽  
Lopez-Coba Ermilo ◽  
Pacheco-Sierra Gualberto ◽  
May-Cruz Christian ◽  
Sierra-Gomez Andrés III
Keyword(s):  
Habitat Use ◽  
Tropical Forest ◽  
Estimation Methods ◽  
Sustainable Harvest ◽  
Population Densities ◽  
Faecal Pellets ◽  
A Value ◽  
Statistical Precision ◽  
Deer Harvest ◽  
Harvest Model

Aims: Estimate the population density of deer in the municipality of Tzucacab, Yucatán in the periods of 2003-2004, 2007-2008 and 2008-2009, determine the use of the habitat by these populations and the sustainability of the deer harvest from the estimated population densities. Study Design: A descriptive and vertical free-living deer population study was carried out in southern Yucatan, Mexico over a three-year period. Methodology: The map of the municipality of Tuzcacab was zoned in quadrants of 36 km2, completing a total of 36 quadrants; Unrestricted random sampling was applied to select seven quadrants in the period from 2003 to 2004 and 18 in each annual period between 2007 and 2009. Population samplings were carried out by applying three population estimation methods: direct sighting in a linear transect of 5 km in length, count of tracks in transect except period 2003-2004 and faecal pellets group count in plots. The evaluation of the use of habitat was carried out using the Bonferroni intervals, from the data of faecal pellets count. The evaluation of the deer harvest was carried out using the sustainable harvest model. Results: The population densities were different in each method, the density by the excreta count was 4.63 ± 2.49 deer / km2 in 2003-2004, 0.294 ± 0.198 deer / km2 in 2007-2008, and in the year 2008-2009 was 0.419 ± 0.0000085 deer / km2. Habitat use in 2007-08 and 2008-2009 was higher in the tropical forest, lower in agriculture and similar to that expected in secondary succession forest (acahual). The values of sustainable harvest, taking as a value the density per count of excreta in the plot because it showed the highest statistical precision, in the period 2003-04 it is sustainable, but in the period from 2007 to 2009 it is not sustainable. Conclusion: The population densities of deer (O. virginianus and M. americana) in Tuzcacab by means of the excreta count method, have decreased significantly. The habitat use preference is the tropical forest. The deer harvest in the period from 2007 to 2009 is not sustainable.

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