scholarly journals Temporal Variation in Forest Bird Survey Data from Tutuila Island, American Samoa

2004 ◽  
Vol 58 (1) ◽  
pp. 99-117 ◽  
Author(s):  
Holly Freifeld ◽  
Chris Solek ◽  
Ailao Tualauleleli
Keyword(s):  
Temporal Variation ◽  
Survey Data ◽  
American Samoa ◽  
Forest Bird ◽  
Bird Survey

scholarly journals Evidence of change in a low-elevation forest bird community of Hawai'i since 1979

2003 ◽  
Vol 13 (3) ◽  
pp. 175-187 ◽  
Author(s):  
Michelle H. Reynolds ◽  
Richard J. Camp ◽  
Bonnie M. B. Nielson ◽  
James D. Jacobi
Keyword(s):  
Native Species ◽  
Bird Species ◽  
Bird Community ◽  
Natural Area ◽  
Present Evidence ◽  
Forest Bird ◽  
Bird Survey ◽  
Elevational Range ◽  
Abundance And Distribution ◽  
Avian Disease

We evaluated the abundance and distribution of low-elevation forest birds on windward Hawai'i Island during August 1993-February 1994, and present evidence of changes in the species composition of the forest bird community since 1979. Endemic Hawaiian birds occurred in native-dominated forests as low as 120 m elevation. Non-native species were detected at all survey locations. We observed non-native Saffron Finch Sicalis flaveola, previously unrecorded in Puna. Variable circular plot surveys of Kahauale'a Natural Area Reserve indicated the disappearance of two native species ('I'iwi Vestiaria coccinea and 'O'u Psittitostra psittacea), and two non-native additions (Red-billed Leiothrix Leiothrix lutea and Kalij Pheasant Lophura leucomelana) to the study area since the Hawai'i Forest Bird Survey conducted in 1979. We present evidence that native 'Elepaio Chasiempsis sandwichensis has experienced a decrease in population density and an elevational range contraction since 1979. Surveys indicate Puna's forest bird community has had increasing aliens and declining native species since 1979. The persistence of some native bird species within the range of avian disease vectors such as Culex quinquefasciatus in forests below 1,000 m elevation presents an important enigma that requires additional study.

scholarly journals Use of North American Breeding Bird Survey data in avian conservation assessments

The Condor ◽  
2017 ◽  
Vol 119 (3) ◽  
pp. 594-606 ◽  
Author(s):  
Kenneth V. Rosenberg ◽  
Peter J. Blancher ◽  
Jessica C. Stanton ◽  
Arvind O. Panjabi
Keyword(s):  
Survey Data ◽  
North American ◽  
Breeding Bird Survey ◽  
Avian Conservation ◽  
Breeding Bird ◽  
Bird Survey ◽  
Conservation Assessments

scholarly journals Antarctic Site Inventory breeding bird survey data, 1994–2013

Ecology ◽  
2013 ◽  
Vol 94 (11) ◽  
pp. 2653-2653 ◽  
Author(s):  
Heather J. Lynch ◽  
Ron Naveen ◽  
Paula Casanovas
Keyword(s):  
Survey Data ◽  
Breeding Bird Survey ◽  
Breeding Bird ◽  
Bird Survey

scholarly journals Effectiveness of Call-Broadcast Surveys for Monitoring Marsh Birds

The Auk ◽  
2005 ◽  
Vol 122 (1) ◽  
pp. 26-35 ◽  
Author(s):  
Courtney J. Conway ◽  
James P. Gibbs
Keyword(s):  
Survey Data ◽  
Detection Probability ◽  
Monitoring Program ◽  
Marsh Bird ◽  
Point Count ◽  
Marsh Birds ◽  
Monitoring Protocol ◽  
Bird Survey ◽  
Bird Monitoring ◽  
Monitoring Effort

Abstract Many species of marsh birds (e.g. rails and bitterns) are believed to be declining in North America, yet we lack an effective monitoring program to estimate their population trends. Broadcast of prerecorded calls to elicit vocalizations is a commonly used method in surveys of marsh birds, but whether gains in detection and index precision outweigh the drawbacks of call-broadcast is unclear. To evaluate the effectiveness of call-broadcast surveys, we pooled marsh-bird survey data from 8,047 point-count surveys contributed by 11 cooperators and compared numbers of birds detected and variation in numbers detected between call-broadcast and passive surveys. For most rails (particularly Virginia Rails [Rallus limicola]), call-broadcast surveys were effective at increasing the detection probability (e.g. average number of Virginia Rails detected per occupied point was 1.25 for call-broadcast surveys and 0.17 for passive surveys). The proportion of points at which no birds were detected was high for all species (range 74–99%) and was slightly lower on call-broadcast surveys as compared with passive surveys. Coefficient of variation (CV) among replicate surveys was higher for passive surveys, particularly for rails (average CV in number of birds detected per point was 209% for passive surveys and 189% for call-broadcast surveys). On the basis of those results, we recommend a marsh-bird monitoring protocol that includes an initial passive period followed by a period of call-broadcast to provide survey data that incorporate the benefits while avoiding the drawbacks of call-broadcast. We also recommend separating both the passive and the call-broadcast periods into 1-min subsegments that will allow estimates of components of detection probability within the monitoring effort. Efectividad de Censos que Reproducen Vocalizaciones Pregrabadas para Monitorear Aves de Pantano

Regression technique to remove temporal variation from geomagnetic survey data

Geophysics ◽  
1982 ◽  
Vol 47 (10) ◽  
pp. 1437-1443 ◽  
Author(s):  
Eric L. Sander ◽  
Charmaine P. Mrazek
Keyword(s):  
Temporal Variation ◽  
Survey Data ◽  
Field Measurements ◽  
Open Ocean ◽  
Regression Technique ◽  
Geomagnetic Survey ◽  
Regression Techniques

A flexible and effective set of procedures has been developed to reconstruct the temporal variation occurring during a geomagnetic survey. These procedures use regression techniques and the field measurements made at survey track intersections. They have been applied to both ship and aircraft survey data collected in open ocean areas to remove from 60 to 80 percent of the temporal variation. This paper presents these procedures and the results for one ship and one aircraft survey.

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