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Title |
Measuring foraging activity in a deep-diving bird: comparing wiggles, oesophageal temperatures and beak-opening angles as proxies of feeding.
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Journal Article |
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Year |
2010 |
Publication |
The Journal of experimental biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
213 |
Issue |
Pt 22 |
Pages |
3874 -80 |
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Keywords |
Animals, Beak, Beak: physiology, Behavior, Animal, Behavior, Animal: physiology, Body Temperature, Body Temperature: physiology, Diving, Diving: physiology, Ecosystem, Esophagus, Esophagus: physiology, Feeding Behavior, Feeding Behavior: physiology, Food Chain, Male, Predatory Behavior, Predatory Behavior: physiology, Remote Sensing Technology, Remote Sensing Technology: instrumentation, Remote Sensing Technology: veterinary, Spheniscidae, Spheniscidae: physiology, |
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Abstract |
Quantification of prey consumption by marine predators is key to understanding the organisation of ecosystems. This especially concerns penguins, which are major consumers of southern food webs. As direct observation of their feeding activity is not possible, several indirect methods have been developed that take advantage of miniaturised data logging technology, most commonly: detection of (i) anomalies in diving profiles (wiggles), (ii) drops in oesophageal temperature and (iii) the opening of mouth parts (recorded with a Hall sensor). In the present study, we used these three techniques to compare their validity and obtain information about the feeding activity of two free-ranging king penguins (Aptenodytes patagonicus). Crucially, and for the first time, two types of beak-opening events were identified. Type A was believed to correspond to failed prey-capture attempts and type B to successful attempts, because, in nearly all cases, only type B was followed by a drop in oesophageal temperature. The number of beak-opening events, oesophageal temperature drops and wiggles per dive were all correlated. However, for a given dive, the number of wiggles and oesophageal temperature drops were lower than the number of beak-opening events. Our results suggest that recording beak opening is a very accurate method for detecting prey ingestions by diving seabirds at a fine scale. However, these advantages are counterbalanced by the difficulty, and hence potential adverse effects, of instrumenting birds with the necessary sensor/magnet, which is in contrast to the less accurate but more practicable methods of measuring dive profiles or, to a lesser extent, oesophageal temperature.
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0022-0949 |
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yes |
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1635 |
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Journal Article |
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Year |
2010 |
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Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
213 |
Issue |
1 |
Pages |
33 -39 |
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137 |
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0022-0949 |
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yes |
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2677 |
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Author |
Mardon J, Nesterova A P, Traugott J, Saunders S M, Bonadonna F, |
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Title |
Insight of scent: experimental evidence of olfactory capabilities in the wandering albatross (Diomedea exulans)
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Journal Article |
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Year |
2010 |
Publication |
Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
213 |
Issue |
4 |
Pages |
558 -563 |
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Abstract |
Wandering albatrosses routinely forage over thousands of kilometres of open ocean, but the sensory mechanisms used in the food search itself have not been completely elucidated. Recent telemetry studies show that some spatial behaviours of the species are consistent with the multimodal foraging strategy hypothesis which proposes that birds use a combination of olfactory and visual cues while foraging at sea. The multimodal foraging strategy hypothesis, however, still suffers from a lack of experimental evidence, particularly regarding the olfactory capabilities of wandering albatrosses. As an initial step to test the hypothesis, we carried out behavioural experiments exploring the sensory capabilities of adult wandering albatrosses at a breeding colony. Three two-choice tests were designed to investigate the birds' response to olfactory and visual stimuli, individually or in combination. Perception of the different stimuli was assessed by comparing the amount of exploration directed towards an experimental display or a control display. Our results indicate that birds were able to perceive the three types of stimulus presented: olfactory, visual and combined. Moreover, olfactory and visual cues were found to have additional effects on the exploratory behaviours of males. This simple experimental demonstration of reasonable olfactory capabilities in the wandering albatross supports the multimodal foraging strategy and is consistent with recent hypotheses of the evolutionary history of procellariiforms.
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0022-0949 |
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yes |
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271 |
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Year |
2023 |
Publication |
Biology Open |
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Volume |
12 |
Issue |
2 |
Pages |
bio059512 |
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Keywords |
Animals Antarctic Antarctic Regions Ecoimmunology Field study Immunity Spheniscidae Stress |
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1091 |
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2046-6390 |
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yes |
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8761 |
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High-quality signal recording down to 0.001 Hz with standard MEMS accelerometers |
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Non peer-reviewed symposium |
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2018 |
Publication |
SEG Technical Program Expanded Abstracts 2018 |
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0 |
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196-200 |
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Abstract |
Recording very low-frequency signal below 1 hertz is a major concern for seismology, in particular passive noise tomography, and is now also considered for some oil and gas applications. The seismic sensors commonly in use for hydrocarbon deposit surveys (geophones and previous generation of MEMS accelerometers) previously had performance limitations in such applications due to their technological design with very low-frequency signal being concealed by instrument noise. Tests on a recent generation of MEMS (Micro Electro-Mechanical System) sensor with an ultra-low noise floor were performed in our lab, and showed outstanding very low-frequency performance in terms of instrument noise and full scale. A teleseism that occurred during our tests was also duly detected. Presentation Date: Tuesday, October 16, 2018 Start Time: 1:50:00 PM Location: Poster Station 10 Presentation Type: Poster |
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133 |
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yes |
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Serial |
7384 |
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Title |
Sperm collection in Black-legged Kittiwakes and characterization of sperm velocity and morphology |
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Journal |
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2018 |
Publication |
Avian Research |
Abbreviated Journal |
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9 |
Issue |
1 |
Pages |
24 |
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Collecting and studying live sperm is central to many important fields of biology. Yet, a simple method to collect live sperm is lacking in wild seabird species. Here, we describe a non-invasive method to collect viable sperm samples based on a simple massage technique applied to male Black-legged Kittiwakes (Rissa tridactyla). |
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330 |
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2053-7166 |
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2053-7166 |
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yes |
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7244 |
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Author |
Kenta Ohara, Yuji Yagi, Shinji Yamashita, Ryo Okuwaki, Shiro Hirano, Yukitoshi Fukahata |
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Title |
Complex evolution of the 2016 Kaikoura earthquake revealed by teleseismic body waves |
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2023 |
Publication |
Progress in Earth and Planetary Science |
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Volume |
10 |
Issue |
1 |
Pages |
35 |
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Keywords |
Body waves Earthquake dynamics Earthquake source observation Waveform inversion |
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133 |
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ISSN |
2197-4284 |
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yes |
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8531 |
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Title |
Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars |
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2019 |
Publication |
Progress in Earth and Planetary Science |
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6 |
Issue |
1 |
Pages |
27 |
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Abstract |
The Super Dual Auroral Radar Network (SuperDARN) is a network of high-frequency (HF) radars located in the high- and mid-latitude regions of both hemispheres that is operated under international cooperation. The network was originally designed for monitoring the dynamics of the ionosphere and upper atmosphere in the high-latitude regions. However, over the last approximately 15?years, SuperDARN has expanded into the mid-latitude regions. With radar coverage that now extends continuously from auroral to sub-auroral and mid-latitudes, a wide variety of new scientific findings have been obtained. In this paper, the background of mid-latitude SuperDARN is presented at first. Then, the accomplishments made with mid-latitude SuperDARN radars are reviewed in five specified scientific and technical areas: convection, ionospheric irregularities, HF propagation analysis, ion-neutral interactions, and magnetohydrodynamic (MHD) waves. Finally, the present status of mid-latitude SuperDARN is updated and directions for future research are discussed. |
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312 |
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2197-4284 |
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2197-4284 |
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yes |
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7505 |
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Title |
International Geomagnetic Reference Field: the thirteenth generation |
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Year |
2021 |
Publication |
Earth, Planets and Space |
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Volume |
73 |
Issue |
1 |
Pages |
49 |
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Keywords |
Geomagnetism IGRF Magnetic field modeling |
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Abstract |
In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted the thirteenth generation of the International Geomagnetic Reference Field (IGRF). This IGRF updates the previous generation with a definitive main field model for epoch 2015.0, a main field model for epoch 2020.0, and a predictive linear secular variation for 2020.0 to 2025.0. This letter provides the equations defining the IGRF, the spherical harmonic coefficients for this thirteenth generation model, maps of magnetic declination, inclination and total field intensity for the epoch 2020.0, and maps of their predicted rate of change for the 2020.0 to 2025.0 time period. |
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139 |
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1880-5981 |
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yes |
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8085 |
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Title |
Evaluation of candidate models for the 13th generation International Geomagnetic Reference Field |
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2021 |
Publication |
Earth, Planets and Space |
Abbreviated Journal |
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Volume |
73 |
Issue |
1 |
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48 |
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Geomagnetism IGRF Magnetic field modeling |
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139 |
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1880-5981 |
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yes |
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7937 |
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