28 research outputs found
Inbal-Schekler/UNET-flocks-detection: v1.0
No full textThe data and the model for the paper: "Automatic detection of migrating soaring bird flocks using weather radars by deep learning
Contrasting seasonal responses to wind in migrant songbirds on a globally-important flyway
No full textContrasting seasonal responses to wind in migrant songbirds on a globally-important flyway
No full textAge-dependent survival rate of the colonial Little Tern (<i>Sternula albifrons</i>)
No full textMany ground-nesting bird species are suffering from habitat loss and population decline. Data on population ecology and demography in colonies of threatened species are thus essential for designing effective conservation protocols. Here, we used extensive ringing and observation data to estimate directly, for the first time, the survival rate of juvenile and adult Little Tern (Sternula albifrons), as well as testing for a possible effect of age on probability of survival. We estimated adult annual survival rate to be 0.77, and juvenile (first year) survival to be 0.49 with a possible linear decrease in the survival rate of the juveniles that ranged from 0.681 to 0.327. We found no evidence that survival was age-dependent among the early age classes after the first year. We discuss these findings in light of survival estimates for other species, and their implications for the Little Tern conservation.</div
Modelling of the influence effects on survival.
No full textModels used for assessment of age and time effects on apparent survival (ф) of the Little Tern (top 10 models; all the models are in supplementary S2 Table). Analysis used the two best p structures from the models of resighting probability.</p
Models used for assessment of age and time effects on resighting probabilities (p) of the Little Tern in Israel.
No full textф structure for all models was ф (a4 –t/t/t/t).</p
Age-dependent survival rate of the colonial Little Tern (<i>Sternula albifrons</i>) - Fig 1
No full textEstimates of (a) apparent survival (± SE) and (b) resigthing (± SE) from the top models for juvenile (in blue), a2 (second year; in light blue) and adult (in red) Little Terns from 2011–2017. Juvenile survival was estimated only until 2016 because a large percentage of individuals return to the breeding sites only in their third year.</p
The brain mechanisms underlying walking in complex situations in healthy older adults and persons with Parkinson's disease
No full textIntroduction: The ability to walk safely and independently is a fundamental component of daily living activities. Walking while dual tasking and obstacle negotiation are two tasks that have been used to investigate walking in complex situations. Deficits in cognitive domains and sensory-motor processes associated with aging and neurodegenration impair the ability to successfully assess the environment and react to it. These changes in the ability to walk are modulated via neural circuits. However, the actual neural circuits of the brain involved in the control of locomotion in different challenging situations are still poorly understood. Methods: Two groups of subjects; 20 healthy older adults (mean age 69.7±1.3 yrs, 50% females) and 47 persons with PD (mean age 71.7±1.1 yrs, 32% females) were studied. The protocol included real and imagined walking while negotiating obstacles and dual tasking. Walking conditions were performed while being monitored with fNIRS and imagined walking were assessed in the MR scanner. A repeated measures design (condition x group) was conducted with two levels; within group and between groups. Results: Significant differences in brain activation were observed in the fMRI and fNIRS. Between groups comparison showed that persons with PD had a significantly higher activation in frontal, parietal, occipital, and cerebellum regions during usual walking compared to healthy older adults (p<0.048). Comparison between the walking tasks within each group revealed (1) increased activation during walking while negotiating obstacles in both groups (p<0.023) and (2) increased activation during walking while dual tasking only in healthy older adults (p<0.035). Correlations between brain activation and performance in motor-cognitive tests were found in both groups however, healthy older adults presented inverse correlation and persons with PD positive correlation. Conclusions: These findings indicate that subjects with PD activate larger brain areas than healthy older adults even during usual walking. Perhaps, this increased activation is a compensatory strategy to enhance performance. The increased activation already during usual walking task may limit the ability to increase activation or recruit additional brain areas during the more complex walking tasks and may contribute to the high prevalence of falls and the dual tasking difficulty in persons with PD.Ph.D.Includes bibliographical referencesby Inbal Maida
Aeroecology meets aviation safety: Early warning systems in Europe and the Middle East prevent collisions between birds and aircraft
No full textThe aerosphere is utilized by billions of birds, moving for different reasons and from short to great distances spanning tens of thousands of kilometres. The aerosphere, however, is also utilized by aviation which leads to increasing conflicts in and around airfields as well as en‐route. Collisions between birds and aircraft cost billions of euros annually and, in some cases, result in the loss of human lives. Simultaneously, aviation has diverse negative impacts on wildlife. During avian migration, due to the sheer numbers of birds in the air, the risk of bird strikes becomes particularly acute for low‐flying aircraft, especially during military training flights. Over the last few decades, air forces across Europe and the Middle East have been developing solutions that integrate ecological research and aviation policy to reduce mutual negative interactions between birds and aircraft. In this paper we 1) provide a brief overview of the systems currently used in military aviation to monitor bird migration movements in the aerosphere, 2) provide a brief overview of the impact of bird strikes on military low‐level operations, and 3) estimate the effectiveness of migration monitoring systems in bird strike avoidance. We compare systems from the Netherlands, Belgium, Germany, Poland and Israel, which are all areas that Palearctic migrants cross twice a year in huge numbers. We show that the en‐route bird strikes have decreased considerably in countries where avoidance systems have been implemented, and that consequently bird strikes are on average 45% less frequent in countries with implemented avoidance systems in place. We conclude by showing the roles of operational weather radar networks, forecast models and international and interdisciplinary collaboration to create safer skies for aviation and birds.Control & Simulatio
Revisiting Qusayr Amra: A New Perspective on Female Imagery
No full textThis essay argues that female representations at Qusayr Amra reflect a deliberate adaptation of pre-Islamic artistic traditions, expressing evolving Umayyad ideas of beauty, gender, and hierarchy. By analyzing the interplay between visual imagery and written texts, including the Qur’an, it reevaluates the significance of female figures and the representational choices made in 8th-century Umayyad palaces in Bilad al-Sham. Drawing on scholars such as Garth Fowden and Nadia Ali, and informed by contemporary gender studies, this essay foregrounds how artistic choices regarding female imagery negotiate social ideals of belief, gender, and power. The analysis begins by examining the development of figurative imagery in early Islam and its cultural context. It then offers a close reading of a key fresco challenging assumptions about modesty and figural representation. Through comparative analysis with another Umayyad site, this study highlights the complexities and meanings of female depictions, revealing diverse interpretations across contexts. While Patron Walid II was not the sole author of these choices, his patronage was crucial in enabling a bold engagement with Islamic visual culture. In doing so, this essay offers new insights into the complexities of early Islamic visual culture and its negotiation of social values
