Population Status, Habitat Use and Breeding Biology of the Endangered Colombian Horned Lark in an Andean Wetland

Ardea ◽  
2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Luis Alejandro Arias-Sosa ◽  
Jimmy Alexander Vargas-Puentes ◽  
Carolina Ramos-Montaño ◽  
Ariel S. Espinosa-Blanco
Keyword(s):  
Habitat Use ◽  
Breeding Biology ◽  
Population Status ◽  
Horned Lark

Habitat Use, Diet and Breeding Biology of Tufted Puffins in Prince William Sound, Alaska

1997 ◽  
Vol 78 (3) ◽  
pp. 102 ◽  
Author(s):  
John F. Piatt ◽  
Daniel D. Roby ◽  
Laird Henkel ◽  
Kriss Neuman
Keyword(s):  
Habitat Use ◽  
Breeding Biology ◽  
Prince William Sound

Habitat use and population status of Yellow-billed and Pacific loons in western Alaska, USA

The Condor ◽  
2014 ◽  
Vol 116 (3) ◽  
pp. 483-492 ◽  
Author(s):  
Joshua H. Schmidt ◽  
Melanie J. Flamme ◽  
Johann Walker
Keyword(s):  
Habitat Use ◽  
Population Status

scholarly journals Foothill yellow-legged frog breeding biology in a semiregulated river, Humboldt County, CA

2021 ◽  
pp. 205-220
Author(s):  
Michael Van Hattem ◽  
William T. Bean ◽  
Pairsa Belamaric ◽  
Holly Gamblin ◽  
Jennie Jones Scherbinski ◽  
...  
Keyword(s):  
Habitat Use ◽  
Breeding Site ◽  
Breeding Biology ◽  
Future Research ◽  
Specific Information ◽  
Egg Masses ◽  
Humboldt County ◽  
Rana Boylii ◽  
Natural Flow ◽  
Natural Flow Regimes

River-breeding foothill yellow-legged frogs (Rana boylii) are endemic to California and Oregon. Across this wide geographic range, many populations have declined due habitat loss, non-native competitors and predators (e.g., American bullfrogs [Lithobates catesbeianus], Centrarchid fish), and disrupted water flow due to dams. Even when flow conditions are not extensively regulated, managers still require basic and region-specific information about the breeding biology of this species to prevent further decline. To document spatiotemporal dynamics of reproductive output during drought and high flow years, we surveyed a 13.5 km reach of the lower Mad River, Humboldt County, CA approximately 70 km downstream of Matthews Dam. We found relatively high densities of egg masses (39 to 59 masses / km). Egg masses were generally laid on small cobbles (mean ±SE diameter = 11 ± 0.24 cm) at depths between 0 and 20 cm, and 95% of egg masses were laid within 6 m of the wetted edge. Egg masses were disproportionately found in the tailouts of fast runs and glides, and found less often than expected in side arms, runs, and riffles than would be expected by chance. Breeding timing appeared to be more related to rapid decreases in stream flow variance than air temperature. Taken with previous information about the species, our results suggest that R. boylii rely on multiple cues to initiate breeding. Our results can be used to help inform breeding timing and habitat use by R. boylii breeding under natural flow regimes in Northern California. Our recommendations for future research include further investigating upland habitat use by post-metamorphic life stages factors that influence breeding site selection.

scholarly journals Population ecology of the Asian house rat (Rattus tanezumi) in complex lowland agroecosystems in the Philippines

2015 ◽  
Vol 42 (2) ◽  
pp. 165 ◽  
Author(s):  
Alexander M. Stuart ◽  
Grant R. Singleton ◽  
Colin V. Prescott
Keyword(s):  
Habitat Use ◽  
The Philippines ◽  
Breeding Biology ◽  
Rice Crop ◽  
Breeding Ecology ◽  
Rodent Control ◽  
Booting Stage ◽  
Effective Time ◽  
Rattus Tanezumi ◽  
Breeding Condition

Context Rattus tanezumi (the Asian house rat) is the principal rodent pest of rice and coconut crops in the Philippines. Little is known about the population and breeding ecology of R. tanezumi in complex agroecosystems; thus, current methods of rodent control may be inappropriate or poorly implemented. Aims To investigate the habitat use, population dynamics and breeding biology of R. tanezumi in complex lowland agroecosystems of the Sierra Madre Biodiversity Corridor, Luzon, and to develop ecologically based rodent management (EBRM) strategies that will target specific habitats at specific times to improve cost-efficiency and minimise non-target risks. Methods An 18-month trapping study was conducted in rice monoculture, rice adjacent to coconut, coconut groves, coconut-based agroforest and forest habitats. Trapped animals were measured, marked and assessed for breeding condition. Key results Five species of rodent were captured across all habitats with R. tanezumi the major pest species in both the rice and coconut crops. The stage of the rice crop was a major factor influencing the habitat use and breeding biology of R. tanezumi. In rice fields, R. tanezumi abundance was highest during the tillering to ripening stages of the rice crop and lowest during the seedling stage, whereas in coconut groves abundance was highest from the seedling to tillering stage of nearby rice crops. Peaks in breeding activity occurred from the booting stage of the rice crop until just after harvest, but >10% of females were in breeding condition at each month of the year. Conclusions In contrast with the practices applied by rice farmers in the study region, the most effective time for lethal management based on the breeding ecology of R. tanezumi is likely to be during the early stages of the rice crop, before the booting stage. Farmers generally apply control actions as individuals. We recommend coordinated community action. Continuous breeding throughout the year may necessitate two community campaigns per rice cropping season. To limit population growth, the most effective time to reduce nesting habitat is from the booting stage until harvest. Implications By adopting EBRM strategies, we expect a reduction in costs associated with rodent control, as well as improved yield and reduced risk to non-target species.

scholarly journals Survey of the Bat Species and their Habitat use in Grand Teton National Park

1985 ◽  
Vol 9 ◽  
pp. 65-68
Author(s):  
David Genter ◽  
Lee Metzgar
Keyword(s):  
Species Composition ◽  
Habitat Use ◽  
National Park ◽  
Baseline Survey ◽  
Population Status ◽  
Factual Information ◽  
Species Occurrence ◽  
Composition Distribution ◽  
Grand Teton National Park

Until recently, little attention has been directed to the bat fauna of GTNP. The role of bats in ecosystems is more significant than previously thought. Also, the public's awareness of bats is growing and as part of routine interpretive needs, the NPS must have factual information on all animals in the Park. A baseline survey was conducted to determine species composition, distribution, abundance, and habitat use of bats in Grand Teton National Park, Wyoming. The principal objectives are: 1. Obtain information on species occurrence and distribution within the Park; 2. Assess the population status for bat species present; 3. Identify rare species in the Park and identify management needs to ensure the viability of these species in GTNP; and 4. Evaluate potential conflicts with human activities.

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