scholarly journals The relationship between syllable repertoire similarity and pairing success in a passerine bird species with complex song

2012 ◽  
Vol 295 ◽  
pp. 68-76 ◽  
Author(s):  
László Zsolt Garamszegi ◽  
Sándor Zsebők ◽  
János Török
Keyword(s):  
Bird Species ◽  
Passerine Bird ◽  
Complex Song ◽  
Syllable Repertoire ◽  
The Relationship

The Effects of Post-Fire Management on Bird Community Succession

1997 ◽  
Vol 7 (4) ◽  
pp. 335 ◽  
Author(s):  
I Izhaki ◽  
M Adar
Keyword(s):  
Pinus Halepensis ◽  
Bird Species ◽  
Bird Community ◽  
Passerine Bird ◽  
Bird Diversity ◽  
Avian Community ◽  
Wild Fire ◽  
Logged Forest ◽  
The Relationship ◽  
Avian Community Structure

In September 1989 a wild fire burned over 300 ha of pine (Pinus halepensis) forest on Mt. Carmel, Israel. In winter 1990, logging took place on several burned plots. Since then, nonbreeding bird communities were censused in unburned plots, in burned plots and in burned logged plots. Canonical correspondence analysis was used to investigate the relationship between bird composition, post-fire managements and time since fire. Thirty-three species of passerine bird were recorded during fall, winter and spring (1991-1994). The most significant differences in avian community structure appeared between the unburned forest and the burned logged forest, and between the first period (1-2 years) post-fire and the following period (3-5 years post-fire). In general, the number of bird species in the ecosystem was increased as the result of imposing different post-fire managements. Therefore, creating a mosaic of different type of habitats contributed in maintaining high bird diversity.

scholarly journals Domain randomization-enhanced deep learning models for bird detection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xin Mao ◽  
Jun Kang Chow ◽  
Pin Siang Tan ◽  
Kuan-fu Liu ◽  
Jimmy Wu ◽  
...  
Keyword(s):  
Deep Learning ◽  
Continuous Monitoring ◽  
Bird Species ◽  
Training Data ◽  
Learning Models ◽  
Fine Grained ◽  
Bird Detection ◽  
Relationship Of ◽  
The Relationship

AbstractAutomatic bird detection in ornithological analyses is limited by the accuracy of existing models, due to the lack of training data and the difficulties in extracting the fine-grained features required to distinguish bird species. Here we apply the domain randomization strategy to enhance the accuracy of the deep learning models in bird detection. Trained with virtual birds of sufficient variations in different environments, the model tends to focus on the fine-grained features of birds and achieves higher accuracies. Based on the 100 terabytes of 2-month continuous monitoring data of egrets, our results cover the findings using conventional manual observations, e.g., vertical stratification of egrets according to body size, and also open up opportunities of long-term bird surveys requiring intensive monitoring that is impractical using conventional methods, e.g., the weather influences on egrets, and the relationship of the migration schedules between the great egrets and little egrets.

Ethno-ornithology of Temuan Community in Ledang, Johor

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Nor Atiqah Binti Norazlimi ◽  
◽  
Amirah Binti Mohd Sarif ◽  
Keyword(s):  
National Park ◽  
Local Community ◽  
Daily Life ◽  
Bird Species ◽  
Daily Activities ◽  
Interview Session ◽  
Scientific Approach ◽  
Knowledge And Practice ◽  
The Village ◽  
The Relationship

Ethno-ornithology is the study of the relationship between people and birds. It is a natural scientific approach that explains the relationship between people’s knowledge and the use of birds in their culture. Temuan community is one of the aborigine ethnics in Malaysia. They practice lifestyles that closely associated with nature. Therefore, this study aimed to investigate the ethno-ornithology knowledge and practice by Temuan Community lived around the Gunung Ledang National Park, Johor, Malaysia. A set of questionnaires was distributed to 40 respondents from the Temuan community to gather the information of birds used in their daily activities. In addition, the information was also obtained from the interview session with the head of the village (Tok Batin). The identification of the birds obtained from the questionnaire and interview was further confirmed by using reliable resources. A total of 29 bird species was successfully identified. Temuan community used birds in their daily life in many ways such as, food, pet, folklore, entertainment, and many more. Understanding ethno-ornithology between local community and avifauna is good as it helps conservationists to keep track of bird species they use and identify the sustainable ways of this practice that align with the conservation of avifauna species.

scholarly journals Limited reproductive impairment in a passerine bird species exposed along a perfluoroalkyl acid (PFAA) pollution gradient

2019 ◽  
Vol 652 ◽  
pp. 718-728 ◽  
Author(s):  
Thimo Groffen ◽  
Robin Lasters ◽  
Ana Lopez-Antia ◽  
Els Prinsen ◽  
Lieven Bervoets ◽  
...  
Keyword(s):  
Bird Species ◽  
Passerine Bird ◽  
Pollution Gradient ◽  
Reproductive Impairment ◽  
Perfluoroalkyl Acid

scholarly journals Birdsong and Sound Transmission: The Benefits of Reverberations

The Condor ◽  
2002 ◽  
Vol 104 (3) ◽  
pp. 564-573 ◽  
Author(s):  
Hans Slabbekoorn ◽  
Jacintha Ellers ◽  
Thomas B. Smith
Keyword(s):  
Bird Species ◽  
Sound Transmission ◽  
Acoustic Properties ◽  
Signal Design ◽  
Signal Attenuation ◽  
Long Distance ◽  
Animal Vocalizations ◽  
Distance Communication ◽  
The Relationship ◽  
Insight Into

Abstract Animal vocalizations used for long-distance communication are shaped by acoustic properties of the environment. Studies of the relationship between signal design and sound transmission typically focus on habitat-induced limitations due to signal attenuation and degradation. However, signal design may not entirely be explained by habitat limitations, but rather by beneficial consequences of reverberations. Narrow-frequency bandwidth notes (NFB notes) are pure notes that change little in frequency, and are typical for many bird species living in dense tropical forests. In contrast to frequency-modulated notes, we show that reverberations lead to a longer and louder signal after transmission for NFB notes. Furthermore, playback experiments to territorial males of an African passerine indicated that longer notes led to a stronger behavioral response. These results suggest that reverberations may benefit signal efficiency depending on the signal design, and add new insight into the selection pressures imposed on acoustic signals by the environment. Canto de Aves y Transmisión de Sonido: Beneficios de las Reverberaciones Resumen. Las vocalizaciones utilizadas por animales para la comunicación a larga distancia están condicionadas por las propiedades acústicas del entorno. Los estudios sobre la relación entre el diseño de las señales y la transmisión del sonido suelen centrarse en los límites impuestos por el hábitat debido a la atenuación y degradación de la señal. Sin embargo, es posible que el diseño de la señal no esté regido exclusivamente por las limitaciones del habitat, sino por las consecuencias beneficiosas de las reverberaciones. Las notas de frecuencia de banda estrecha (notas NFB) son notas puras que cambian poco de frecuencia y son típicas de varias especies que habitan bosques tropicales densos. Al contrario que en las notas de frecuencia modulada, mostramos que las reverberaciones alargan y aumentan la señal de las notas NFB. Asimismo, experimentos de playback con machos territoriales de un paseriforme africano indican que las notas más largas provocan una mayor respuesta. Estos resultados sugieren que las reverberaciones pueden mejorar la eficiencia de la señal, dependiendo del diseño de la misma, y añaden un nuevo componente a nuestro conocimiento sobre las presiones selectivas impuestas por el entorno sobre las señales acústicas.

scholarly journals The relationship of telomere length to baseline corticosterone levels in nestlings of an altricial passerine bird in natural populations

2016 ◽  
Vol 13 (1) ◽  
Author(s):  
Verónica Quirici ◽  
Claudia Jimena Guerrero ◽  
Jesse S. Krause ◽  
John C. Wingfield ◽  
Rodrigo A. Vásquez
Keyword(s):  
Telomere Length ◽  
Natural Populations ◽  
Passerine Bird ◽  
Baseline Corticosterone ◽  
Relationship Of ◽  
The Relationship

Winter Ecological Energetics of 2 Passerine Bird Species in Temperate Wet Forest

1988 ◽  
Vol 15 (3) ◽  
pp. 319 ◽  
Author(s):  
J Haylock ◽  
a Lill
Keyword(s):  
Bird Species ◽  
Metabolic Cost ◽  
Passerine Bird ◽  
Foraging Efficiency ◽  
Energy Budgets ◽  
Similar Time ◽  
Energy Expenditures ◽  
Eastern Australia ◽  
Temperate Birds ◽  
Winter Time

Autumn and winter time-energy budgets were constructed for brown thornbills, Acanthiza pusilla, and eastern yellow robins, Eopsaltria australis, inhabiting a temperate wet forest in south-eastern Australia. Birds spent 84-88% of daylight hours foraging in both seasons, but decreased the metabolic cost of other activity in winter by spending more time on energetically inexpensive behaviours. Estimated daily energy expenditures were either seasonally constant or increased (thornbill) or decreased (robin) in winter by no nore than l0%, depending on the assumed degree of substitution for the thermoregulatory requirement. Thornbills increased foraging efficiency in winter to compensate for the reduction in absolute foraging time. Less dramatic changes in behavioural strategies were required to achieve energy balance than have been recorded for many small north temperate birds. Brown thornbills used an energetically expensive, active search foraging technique to capture small, cryptic prey at a fast rate. Yellow robins employed an inexpensive, 'sit-and-wait' strategy to capture larger, more conspicuous prey at a slower rate. Both species had similar time investments in foraging, but allocated greatly differing proportions of energy to active foraging and resting alert. These contrasting strategies offer the potential for performing several activities simultaneously in the yellow robin and for reducing foraging and vigilance investments through exploiting gregariousness in the brown thornbill.

Sign in / Sign up

Export Citation Format

Share Document