scholarly journals Demonstration of autonomous aerial acoustic recording systems to inventory Department of Defense bird populations

2021 ◽  
Author(s):  
David Buehler ◽  
Richard Fischer ◽  
John Wilkerson ◽  
Stacy Worley ◽  
David Smith ◽  
...  
Keyword(s):  
Department Of Defense ◽  
Recording System ◽  
Innovative Technology ◽  
Field Validation ◽  
Bird Populations ◽  
System A ◽  
Acoustic Recording ◽  
Validation Tests ◽  
Avian Populations ◽  
Avian Vocalizations

This demonstration project addressed the Department of Defense need for innovative technology for monitoring avian populations in inaccessible areas. This report presents results from field validation tests for an autonomous aerial acoustic recording system, a helium-filled weather balloon that transported an instrument payload over inaccessible areas (e.g., ordnance impact areas) to record avian vocalizations.

Neural Network for Automatic Analysis of Motility Data

1994 ◽  
Vol 33 (01) ◽  
pp. 157-160 ◽  
Author(s):  
S. Kruse-Andersen ◽  
J. Kolberg ◽  
E. Jakobsen
Keyword(s):  
Neural Network ◽  
Muscular Activity ◽  
Recording System ◽  
Automatic Analysis ◽  
Biologically Relevant ◽  
System A ◽  
The Neural Network ◽  
Valuable Method ◽  
Motor Abnormalities ◽  
Trained Network

Abstract:Continuous recording of intraluminal pressures for extended periods of time is currently regarded as a valuable method for detection of esophageal motor abnormalities. A subsequent automatic analysis of the resulting motility data relies on strict mathematical criteria for recognition of pressure events. Due to great variation in events, this method often fails to detect biologically relevant pressure variations. We have tried to develop a new concept for recognition of pressure events based on a neural network. Pressures were recorded for over 23 hours in 29 normal volunteers by means of a portable data recording system. A number of pressure events and non-events were selected from 9 recordings and used for training the network. The performance of the trained network was then verified on recordings from the remaining 20 volunteers. The accuracy and sensitivity of the two systems were comparable. However, the neural network recognized pressure peaks clearly generated by muscular activity that had escaped detection by the conventional program. In conclusion, we believe that neu-rocomputing has potential advantages for automatic analysis of gastrointestinal motility data.

Snag Densities in Managed Stands of the South Carolina Coastal Plain

1983 ◽  
Vol 7 (4) ◽  
pp. 224-229 ◽  
Author(s):  
Richard F. Harlow ◽  
David C. Guynn
Keyword(s):  
South Carolina ◽  
Coastal Plain ◽  
Avian Species ◽  
National Forest ◽  
Population Densities ◽  
Bird Populations ◽  
Cavity Nesters ◽  
Minimum Number ◽  
Pine Stands ◽  
Avian Populations

Abstract The availability of pine and hardwood snags was determined in managed pine and nonpine stands on the Francis Marion National Forest in the Coastal Plain of South Carolina. An estimate was made of snags required for nesting by avian cavity nesters indigenous to the region and of the density of cavity nesters currently provided for on the forest. Avian species that use snags 5 to 9 in. d.b.h. were apparently provided with more than 100 percent of the minimum number of suitable-size snags for average bird populations in the nonpine stands, which encompassed about 30 percent of the area. In pine stands, by contrast, there were enough snags of this size for only 20 percent of the average avian populations. For species using larger snags (≥10 in. d.b.h.), nonpine stands provided enough for approximately 27 percent of average bird populations, while pine stands provided snags for only about 6 percent of average population densities.

CONCEPT OF A SYSTEM DETERMINING TRAJECTORY AND FALL SITE OF FLYING OBJECTS

2020 ◽  
Vol 153 (1) ◽  
pp. 21-36
Author(s):  
Szymon Elert ◽  
Tomasz Kuczerski
Keyword(s):  
Data Transmission ◽  
Recording System ◽  
Computer Application ◽  
Transmission Channel ◽  
Data Recording ◽  
Basic Algorithm ◽  
Navigation Data ◽  
System A ◽  
Recorded Data ◽  
Initial Concept

The paper presents an initial concept of a flying object trajectory recording system employing a data recording algorithm (operating on the base of the raw recorded data) and radio transmittion modules. Operation of developed system is based on microcontroller Atmega, a magnetometer module, a gyroscope and acceleration meter, and a RF miniature transmitter and SDR receiver. The initial performance of application analysing and recording the data is provided. Moreover, subunits available on the market have been reviewed to select the modules dedicated to the system. A possibility for record-ing the transmitted navigation data was studied. Application of SDR receiver in combination with a computer application monitoring the data transmission channel up to 1 kilometre is described with the configuration of the system, and the schematic of measurement transmitting and receiving modules, and the surveillance of transmitted data quality. The basic algorithm of application using the received data for reconstruction of object’s flying path and prediction of a fall point is presented. Moreover an analysis is included for possible applications of the above mentioned system.

scholarly journals Impacts of deforestation on passerine avifauna in the Opunohu Valley of Mo'orea, French Polynesia

2016 ◽  
Author(s):  
Vanessa M. ZoBell ◽  
Brett J Furnas
Keyword(s):  
Detection Probability ◽  
Bird Species ◽  
Canopy Cover ◽  
French Polynesia ◽  
Passerine Bird ◽  
Oceanic Islands ◽  
Bird Populations ◽  
Green Fruit ◽  
Discrete Nature ◽  
Acoustic Recording

Human expansion has negatively impacted biodiversity. Oceanic islands have some of the most diverse, endemic biodiversity. Endemism leads to vulnerability due to the isolated and discrete nature of oceanic islands. Birds are indicator species that adapt to change very quickly. By analyzing birds, we can investigate how changes in behavior and abundance may occur for different species in the future. Nine passerine bird species were studied with automated acoustic recording devices. Recording devices were places in agricultural, forest, and mixed habitats. Three invasive species preferred agriculture areas and low canopy cover, based on call frequency and detection probability. Native bird detectability was significantly lower than invasive bird detectability. Occupancy was above 0.8 for all species, except for the gray-green fruit dove that was >0.6. Native bird populations are at risk, based on their calling number and detection probability.

scholarly journals Persistent impacts of West Nile virus on North American bird populations

2015 ◽  
Vol 112 (46) ◽  
pp. 14290-14294 ◽  
Author(s):  
T. Luke George ◽  
Ryan J. Harrigan ◽  
Joseph A. LaManna ◽  
David F. DeSante ◽  
James F. Saracco ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Disease Risk ◽  
Phylogenetic Analyses ◽  
West Nile ◽  
Factors Affecting ◽  
Bird Populations ◽  
Continental Scale ◽  
North American Bird ◽  
Avian Populations ◽  
The Impact

Since its introduction to North America in 1999, West Nile virus (WNV) has had devastating impacts on native host populations, but to date these impacts have been difficult to measure. Using a continental-scale dataset comprised of a quarter-million birds captured over nearly two decades and a recently developed model of WNV risk, we estimated the impact of this emergent disease on the survival of avian populations. We find that populations were negatively affected by WNV in 23 of the 49 species studied (47%). We distinguished two groups of species: those for which WNV negatively impacted survival only during initial spread of the disease (n = 11), and those that show no signs of recovery since disease introduction (n = 12). Results provide a novel example of the taxonomic breadth and persistent impacts of this wildlife disease on a continental scale. Phylogenetic analyses further identify groups (New World sparrows, finches, and vireos) disproportionally affected by temporary or persistent WNV effects, suggesting an evolutionary dimension of disease risk. Identifying the factors affecting the persistence of a disease across host species is critical to mitigating its effects, particularly in a world marked by rapid anthropogenic change.

scholarly journals Impacts of deforestation on passerine avifauna in the Opunohu Valley of Mo'orea, French Polynesia

2016 ◽  
Author(s):  
Vanessa M. ZoBell ◽  
Brett J Furnas
Keyword(s):  
Detection Probability ◽  
Bird Species ◽  
Canopy Cover ◽  
French Polynesia ◽  
Passerine Bird ◽  
Oceanic Islands ◽  
Bird Populations ◽  
Green Fruit ◽  
Discrete Nature ◽  
Acoustic Recording

Human expansion has negatively impacted biodiversity. Oceanic islands have some of the most diverse, endemic biodiversity. Endemism leads to vulnerability due to the isolated and discrete nature of oceanic islands. Birds are indicator species that adapt to change very quickly. By analyzing birds, we can investigate how changes in behavior and abundance may occur for different species in the future. Nine passerine bird species were studied with automated acoustic recording devices. Recording devices were places in agricultural, forest, and mixed habitats. Three invasive species preferred agriculture areas and low canopy cover, based on call frequency and detection probability. Native bird detectability was significantly lower than invasive bird detectability. Occupancy was above 0.8 for all species, except for the gray-green fruit dove that was >0.6. Native bird populations are at risk, based on their calling number and detection probability.

A ROLE OF WILD BIRD POPULATION IN THE TRANSMISSION OF PARASITIC FLATWORMS (PLATYHELMINTHES: CESTOIDEA AND TREMATODEA) IN VIETNAM’S FOREST

2020 ◽  
Vol 65 (10) ◽  
pp. 99-107
Author(s):  
Boyko Georgiev B. ◽  
Jean Mariaux ◽  
Gergana Vasileva P ◽  
Huy Nguyen Quoc ◽  
Manh Vu Quang
Keyword(s):  
National Parks ◽  
Wild Bird ◽  
Bird Species ◽  
Point Of View ◽  
Avian Species ◽  
Mountainous Region ◽  
Bird Population ◽  
Bird Populations ◽  
Avian Populations

The study aimed to evaluate the role of transmitting flatworms (Cestoidea and Trematodea) of wild bird populations in three national parks of Vietnam: Xuan Son in the Northwest mountainous region, Tam Dao in the Northeast mountainous region, and Cat Ba in the Hong River Delta region. Twenty-two wild avian species of 10 families were found to contain parasitic flatworms. According to the number of avian species containing parasitic flatworms, bird families are ranking: Timaliidae recorded with 7 species > Leiothrichidae and Nectariniidae both with 3 species > Pycononotidae and Muscicapidae both with 2 species > Vireonidae, Sylvidae, Picidae, Cisticolidae and Cettiidae with 1 species. According to sex, avian populations containing parasitic flatworms decrease in the order: females accounting for 43.94% of the total individuals > males for 39.40% > juveniles for 16.66%. Three bird species containing flatworms A. pallidus, M. gularis and C. bayumas were found in two of the studied national parks, among them, only the first species was found common to all three studied national parks. They are vectors of high significance from a parasitological point of view.

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