Altitudinal Distribution of Small Mammals along a Cross-Sectional Transect through the Arkansas River Watershed, Colorado

1973 ◽  
Vol 17 (4) ◽  
pp. 315 ◽  
Author(s):  
David M. Armstrong ◽  
Benjamin H. Banta ◽  
Edward J. Pokropus
Keyword(s):  
Small Mammals ◽  
Altitudinal Distribution ◽  
Cross Sectional ◽  
Arkansas River ◽  
River Watershed

scholarly journals Canine visceral leishmaniasis in riverside communities of the Cuiabá river watershed

2019 ◽  
Vol 40 (6Supl2) ◽  
pp. 3313
Author(s):  
Valéria Régia Franco Sousa ◽  
Álvaro Felipe de Lima Ruy Dias ◽  
Juliana Yuki Rodrigues ◽  
Mariana de Medeiros Torres ◽  
Janaína Marcela Assunção Rosa Moreira ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Visceral Leishmaniasis ◽  
Urban Areas ◽  
Axenic Culture ◽  
Antibody Test ◽  
Enzyme Linked Immunosorbent Assay ◽  
Lutzomyia Longipalpis ◽  
Cross Sectional ◽  
Mato Grosso ◽  
River Watershed

Visceral Leishmaniasis (VL) is a parasitic zoonosis expanding in Brazil. Several municipalities in the state of Mato Grosso including those on the river Cuiabá have reported the incidence of both human and canine cases and the identification of sandfly vector, Lutzomyia longipalpis and Lu. cruzi. Dogs are considered the main reservoir of Leishmania chagasi in the urban areas, hence, we devised a cross-sectional study aimed at assessing the prevalence of the infection in the dogs of riverside communities on Cuiabá River watershed by parasitological (parasitic isolation in culture), serological, and molecular methods. Of the 248 surveyed dogs, 24 were positive in enzyme linked immunosorbent assay (ELISA) or immunofluorescence antibody test (IFAT), with a prevalence of 9.7%. The riverside communities located in the town of Santo Antonio do Leverger displayed a higher prevalence of the disease than the cities of Cuiabá and Várzea Grande; however, the difference was not statistically significant (p > 0.05). Dogs born in the communities had a 3.24-fold higher risk of acquiring the infection. Promastigote were isolated in the axenic culture from the bone marrow samples and intact skin. Further, DNA of Leishmania sp. was detected in the bone marrow samples, lymph nodes, leukocyte cover, and skin of only one examined dog. These samples were sequenced and they showed 99% homology to L. infantum. To conclude, we observed a higher prevalence of infection in Riverside communities of Santo Antonio do Leverger and the confirmation of autochthony in these areas justifies the surveillance actions to minimise the risk of transmission within the riverine community itself, besides its dissemination to other areas by tourism.

scholarly journals Altitudinal distribution, habitat use, and abundance of Grallaria antpittas in the Central Andes of Colombia

1999 ◽  
Vol 9 (3) ◽  
pp. 271-281 ◽  
Author(s):  
Gustavo H. Kattan ◽  
J. William Beltran
Keyword(s):  
Habitat Use ◽  
Habitat Management ◽  
Central Andes ◽  
Local Scale ◽  
Tropical Andes ◽  
Altitudinal Distribution ◽  
River Watershed ◽  
Species Overlap ◽  
Management Plans ◽  
Early Regeneration

SummaryGrallaria antpittas are a group of little known birds from the understorey of humid forests of the tropical Andes, with several species having very narrow distributions. At Ucumari Regional Park, which protects the Otún River watershed in the Central Andes of Colombia, five species occur sympatrically at 2,400 m, including the recently rediscovered G. milleri, of which this is the only known population. We studied the patterns of altitudinal distribution, habitat use and abundance of the five species in the park. We found altitudinal segregation at a local scale, with two species, G. ruficapilla and G. squamigera, found at lower elevations (1,800–2,500 m) and two other species, G. nuchalis and G. rufocinerea, at higher elevations (2,400–3,000); G. milleri was recorded only in the 2,400–2,600 m range. The five species overlap in the range 2,400–2,600 m, where they occur in three habitats: early regeneration, overgrown alder plantations and 30-year-old forest. There were no differences in density among habitats for any species; the five species used the three habitats in proportion to their occurrence in the landscape. Grallaria milleri had the highest overall density (1.3 ind/ha) while G. squamigera had the lowest density (0.2 ind/ha), and the other three species were intermediate. We estimated 106 individuals of G. milleri in an area of 63 ha, and only seven individuals of G. squamigera. The Otún River watershed concentrates an unusual number of Grallaria antpittas, including three endemic species, and the information presented here is fundamental to any future habitat management plans to ensure the persistence of these populations.

Little Arkansas River Watershed Restoration

2008 ◽  
Author(s):  
Philip Barnes ◽  
Dan Devlin ◽  
Tim Keane ◽  
Ron Graber ◽  
Dale Ladd ◽  
...  
Keyword(s):  
Watershed Restoration ◽  
Arkansas River ◽  
River Watershed

Bone strength in small mammals and bipedal birds: do safety factors change with body size?

1982 ◽  
Vol 98 (1) ◽  
pp. 289-301 ◽  
Author(s):  
A. A. Biewener
Keyword(s):  
Body Size ◽  
Small Mammals ◽  
Bending Strength ◽  
Published Data ◽  
Small Animals ◽  
Safety Factors ◽  
Cross Sectional ◽  
Limb Bones ◽  
Significant Difference ◽  
Large Animals

Measurements of the cross-sectional geometry and length of bones from animals of different sizes suggest that peak locomotory stresses might be as much as nine times greater in the limb bones of a 300 kg horse than those of a 0.10 kg chipmunk. To determine if the bones of larger animals are stronger than those of small animals, the bending strength of whole bone specimens from the limbs of small mammals and bipedal birds was measured and compared with published data for large mammalian cortical bone (horses and bovids). No significant difference (P greater than 0.2) was found in the failure stress of bone over a range in size from 0.05-700 kg (233 +/− 53 MN/m2 for small animals compared to 200 +/− 28 MN/m2 for large animals). This finding suggests that either the limb bones of small animals are much stronger than they need to be, or that other aspects of locomotion (e.g. duty factor and limb orientation relative to the direction of the ground force) act to decrease peak locomotory stresses in larger animals.

scholarly journals QCam: sUAS-Based Doppler Radar for Measuring River Discharge

2020 ◽  
Vol 12 (20) ◽  
pp. 3317
Author(s):  
John W. Fulton ◽  
Isaac E. Anderson ◽  
C.-L. Chiu ◽  
Wolfram Sommer ◽  
Josip D. Adams ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Altitude ◽  
River Discharge ◽  
Near Field ◽  
Surface Velocity ◽  
Sectional Area ◽  
Mean Velocity ◽  
Cross Sectional ◽  
Arkansas River ◽  
South Platte River

The U.S. Geological Survey is actively investigating remote sensing of surface velocity and river discharge (discharge) from satellite-, high altitude-, small, unmanned aircraft systems- (sUAS or drone), and permanent (fixed) deployments. This initiative is important in ungaged basins and river reaches that lack the infrastructure to deploy conventional streamgaging equipment. By coupling alternative discharge algorithms with sensors capable of measuring surface velocity, streamgage networks can be established in regions where data collection was previously impractical or impossible. To differentiate from satellite or high-altitude platforms, near-field remote sensing is conducted from sUAS or fixed platforms. QCam is a Doppler (velocity) radar mounted and integrated on a 3DR© Solo sUAS. It measures the along-track surface velocity by spot dwelling in a river cross section at a vertical where the maximum surface velocity is recorded. The surface velocity is translated to a mean-channel (mean) velocity using the probability concept (PC), and discharge is computed using the PC-derived mean velocity and cross-sectional area. Factors including surface-scatterer quality, flight altitude, propwash, wind drift, and sample duration may affect the radar-returns and the subsequent computation of mean velocity and river discharge. To evaluate the extensibility of the method, five science flights were conducted on four rivers of varying size and dynamics and included the Arkansas River, Colorado (CO), USA (two events); Salcha River near Salchaket, Alaska (AK), USA; South Platte River, CO, USA; and the Tanana River, AK, USA. QCam surface velocities and river discharges were compared to conventional streamgaging methods, which represented truth. QCam surface velocities for the Arkansas River, Salcha River, South Platte River, and Tanana River were 1.02 meters per second (m/s) and 1.43 m/s; 1.58 m/s; 0.90 m/s; and 2.17 m/s, respectively. QCam discharges (and percent differences) were 9.48 (0.3%) and 20.3 cubic meters per second (m3/s) (2.5%); 62.1 m3/s (−10.4%); 3.42 m3/s (7.3%), and 1579 m3/s (−18.8%). QCam results compare favorably with conventional streamgaging and are a viable near-field remote sensing technology that can be operationalized to deliver real-time surface velocity, mean velocity, and river discharge, if cross-sectional area is available.

scholarly journals A cross-sectional study of small mammals for tick-borne pathogen infection in northern Mongolia

2018 ◽  
Vol 8 (1) ◽  
pp. 1450591 ◽  
Author(s):  
Laura A. Pulscher ◽  
Thomas C. Moore ◽  
Luke Caddell ◽  
Lkhagvatseren Sukhbaatar ◽  
Michael E. von Fricken ◽  
...  
Keyword(s):  
Small Mammals ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Pathogen Infection ◽  
Cross Sectional ◽  
Northern Mongolia
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