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Title |
Poor flight performance in deep-diving cormorants.
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Journal Article |
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Year |
2011 |
Publication  |
The Journal of experimental biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
214 |
Issue |
Pt 3 |
Pages |
412 -21 |
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Keywords |
Animals, Biomechanics, Birds, Birds: physiology, Body Weight, Diving, Diving: physiology, Energy Metabolism, Female, Flight, Animal, Flight, Animal: physiology, Male, Muscle, Skeletal, Muscle, Skeletal: physiology, Respiration, Seawater, Swimming, Swimming: physiology, Water, Wing, Wing: anatomy & histology, Wing: physiology, |
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Abstract |
Aerial flight and breath-hold diving present conflicting morphological and physiological demands, and hence diving seabirds capable of flight are expected to face evolutionary trade-offs regarding locomotory performances. We tested whether Kerguelen shags Phalacrocorax verrucosus, which are remarkable divers, have poor flight capability using newly developed tags that recorded their flight air speed (the first direct measurement for wild birds) with propeller sensors, flight duration, GPS position and depth during foraging trips. Flight air speed (mean 12.7 m s(-1)) was close to the speed that minimizes power requirement, rather than energy expenditure per distance, when existing aerodynamic models were applied. Flights were short (mean 92 s), with a mean summed duration of only 24 min day(-1). Shags sometimes stayed at the sea surface without diving between flights, even on the way back to the colony, and surface durations increased with the preceding flight durations; these observations suggest that shags rested after flights. Our results indicate that their flight performance is physiologically limited, presumably compromised by their great diving capability (max. depth 94 m, duration 306 s) through their morphological adaptations for diving, including large body mass (enabling a large oxygen store), small flight muscles (to allow for large leg muscles for underwater propulsion) and short wings (to decrease air volume in the feathers and hence buoyancy). The compromise between flight and diving, as well as the local bathymetry, shape the three-dimensional foraging range (<26 km horizontally, <94 m vertically) in this bottom-feeding cormorant.
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0022-0949 |
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2682 |
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Title |
Experimentally reduced corticosterone release promotes early breeding in black-legged kittiwakes
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Journal Article |
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Year |
2011 |
Publication |
The Journal of Experimental Biology |
Abbreviated Journal |
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Volume |
214 |
Issue |
12 |
Pages |
2005 -2013 |
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Abstract |
Breeding at the right time is important for successful reproduction. In birds, stressful environmental conditions are known to delay the timing of breeding but the underlying mechanisms are poorly understood. The stress hormone corticosterone appears to be a good candidate for mediating egg-laying date according to early environmental conditions and physiological state. By experimentally reducing the release of corticosterone in black-legged kittiwakes during the pre-laying period, we tested whether egg-laying date was mechanistically linked to corticosterone levels. Male and female kittiwakes were implanted with a low dose of exogenous corticosterone to inhibit endogenous corticosterone production. According to our predictions, the experimental reduction of corticosterone release was paralleled by a significant advancement of egg laying in females (around 4 days earlier). In addition, females with experimentally reduced corticosterone release gained mass during the pre-laying period compared with controls. Ultimately, the advancement of egg laying in females with experimentally reduced corticosterone levels was associated with an enhanced breeding success. This effect was strongly sex specific. In corticosterone-treated male kittiwakes, egg-laying date and reproductive success were not affected, but breeding probability was lower than in controls. This corticosterone treatment did not influence immediate clutch size, or return rate and breeding decision the following year. Our results support the hypothesis that corticosterone secretion during the pre-laying period mediates the timing of breeding in this long-lived seabird, possibly through the dynamics of energy reserves.
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330 |
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Bachelor's thesis |
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0022-0949 |
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3518 |
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Title |
Differential muscular myosin heavy chain expression of the pectoral and pelvic girdles during early growth in the king penguin (Aptenodytes patagonicus) chick
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Journal Article |
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Year |
2011 |
Publication |
The Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
214 |
Issue |
11 |
Pages |
1829 -1835 |
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Abstract |
Continuous growth, associated with a steady parental food supply, is a general pattern in offspring development. So that young chicks can acquire their locomotor independence, this period is usually marked by a fast maturation of muscles, during which different myosin heavy chain (MyHC) isoforms are expressed. However, parental food provisioning may fluctuate seasonally, and offspring therefore face a challenge to ensure the necessary maturation of their tissues when energy is limited. To address this trade-off we investigated muscle maturation in both the pectoral and pelvic girdles of king penguin chicks. This species has an exceptionally long rearing period (1 year), which is prolonged when parental food provisioning is drastically reduced during the sub-Antarctic winter. Approximately 1 month post hatching, chicks acquire a functional pedestrian locomotion, which uses pelvic muscles, whereas swimming, which uses the pectoral muscles, only occurs 1 year later. We therefore tested the hypothesis that the MyHC content of the leg muscles reaches a mature state before those of the pectoral muscles. We found that leg muscle MyHC composition changed with the progressive acquisition of pedestrian locomotion, whereas pectoral muscle fibres reached their mature MyHC profile as early as hatching. Contrary to our predictions, the acquisition of the adult profile in pectoral muscles could be related to an early maturation of the contractile muscular proteins, presumably associated with early thermoregulatory capacities of chicks, necessary for survival in their cold environment. This differential maturation appears to reconcile both the locomotor and environmental constraints of king penguin chicks during growth.
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119 |
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0022-0949 |
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yes |
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Serial |
3801 |
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Author |
Sachs G, Traugott J, Nesterova A P, Bonadonna F, |
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Title |
Experimental verification of dynamic soaring in albatrosses
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Journal Article |
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Year |
2013 |
Publication |
The Journal of Experimental Biology |
Abbreviated Journal |
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Volume |
216 |
Issue |
22 |
Pages |
4222 -4232 |
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Abstract |
Dynamic soaring is a small-scale flight manoeuvre which is the basis for the extreme flight performance of albatrosses and other large seabirds to travel huge distances in sustained non-flapping flight. As experimental data with sufficient resolution of these small-scale movements are not available, knowledge is lacking about dynamic soaring and the physical mechanism of the energy gain of the bird from the wind. With new in-house developments of GPS logging units for recording raw phase observations and of a dedicated mathematical method for postprocessing these measurements, it was possible to determine the small-scale flight manoeuvre with the required high precision. Experimental results from tracking 16 wandering albatrosses (Diomedea exulans) in the southern Indian Ocean show the characteristic pattern of dynamic soaring. This pattern consists of four flight phases comprising a windward climb, an upper curve, a leeward descent and a lower curve, which are continually repeated. It is shown that the primary energy gain from the shear wind is attained in the upper curve where the bird changes the flight direction from windward to leeward. As a result, the upper curve is the characteristic flight phase of dynamic soaring for achieving the energy gain necessary for sustained non-flapping flight. |
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354 |
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0022-0949 |
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yes |
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4740 |
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Author |
Monternier Pierre-Axel, Marmillot Vincent, Rouanet Jean-Louis, Roussel Damien, |
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Title |
Mitochondrial phenotypic flexibility enhances energy savings during winter fast in king penguin chicks
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Journal Article |
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Year |
2014 |
Publication |
The Journal of Experimental Biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
217 |
Issue |
15 |
Pages |
2691 -2697 |
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131 |
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0022-0949 |
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yes |
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Serial |
5179 |
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Title |
Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour.
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Journal Article |
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Year |
2014 |
Publication |
The Journal of experimental biology |
Abbreviated Journal |
J. Exp. Biol. |
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Volume |
217 |
Issue |
Pt 14 |
Pages |
2609-19 |
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Keywords |
Animals, Behavior, Animal, Behavior, Animal: physiology, Biomechanical Phenomena, Body Composition, Diving, Diving: physiology, Female, Oceans and Seas, Seals, Earless, Seals, Earless: physiology, Swimming, Swimming: physiology, Telemetry, |
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Abstract |
Mature female southern elephant seals (Mirounga leonina) come ashore only in October to breed and in January to moult, spending the rest of the year foraging at sea. Mature females may lose as much as 50% of their body mass, mostly in lipid stores, during the breeding season due to fasting and lactation. When departing to sea, post-breeding females are negatively buoyant, and the relative change in body condition (i.e. density) during the foraging trip has previously been assessed by monitoring the descent rate during drift dives. However, relatively few drift dives are performed, resulting in low resolution of the temporal reconstruction of body condition change. In this study, six post-breeding females were equipped with time-depth recorders and accelerometers to investigate whether changes in active swimming effort and speed could be used as an alternative method of monitoring density variations throughout the foraging trip. In addition, we assessed the consequences of density change on the swimming efforts of individuals while diving and investigated the effects on dive duration. Both descent swimming speed and ascent swimming effort were found to be strongly correlated to descent rate during drift dives, enabling the fine-scale monitoring of seal density change over the whole trip. Negatively buoyant seals minimized swimming effort during descents, gliding down at slower speeds, and reduced their ascent swimming effort to maintain a nearly constant swimming speed as their buoyancy increased. One per cent of seal density variation over time was found to induce a 20% variation in swimming effort during dives with direct consequences on dive duration.
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0022-0949 |
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yes |
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5905 |
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Title |
Modulation of heart rate response to acute stressors throughout the breeding season in the king penguin Aptenodytes patagonicus.
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Journal Article |
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Year |
2015 |
Publication |
The Journal of experimental biology |
Abbreviated Journal |
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Volume |
218 |
Issue |
Pt 11 |
Pages |
1686-92 |
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Abstract |
'Fight-or-flight' stress responses allow animals to cope adaptively to sudden threats by mobilizing energy resources and priming the body for action. Because such responses can be costly and redirect behavior and energy from reproduction to survival, they are likely to be shaped by specific life-history stages, depending on the available energy resources and the commitment to reproduction. Here, we consider how heart rate (HR) responses to acute stressors are affected by the advancing breeding season in a colonial seabird, the king penguin (Aptenodytes patagonicus). We subjected 77 birds (44 males, 33 females) at various stages of incubation and chick-rearing to three experimental stressors (metal sound, distant approach and capture) known to vary both in their intensity and associated risk, and monitored their HR responses. Our results show that HR increase in response to acute stressors was progressively attenuated with the stage of breeding from incubation to chick-rearing. Stress responses did not vary according to nutritional status or seasonal timing (whether breeding was initiated early or late in the season), but were markedly lower during chick-rearing than during incubation. This pattern was obvious for all three stressors. We discuss how 'fight-or-flight' responses may be modulated by considering the energy commitment to breeding, nutritional status and reproductive value of the brood in breeding seabirds.
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0022-0949 |
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6096 |
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Author |
Cunningham Gregory B, Bonadonna Francesco, |
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Title |
King penguins can detect two odours associated with conspecifics.
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Journal Article |
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Year |
2015 |
Publication |
The Journal of experimental biology |
Abbreviated Journal |
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Volume |
218 |
Issue |
Pt 21 |
Pages |
3374-6 |
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Abstract |
Recent studies on olfaction in penguins have focused on their use of odours while foraging. It has been proposed for some seabirds that an olfactory landscape shaped by odours coming from feeding areas exists. Islands and colonies, however, may also contribute to the olfactory landscape and may act as an orienting map. To test sensitivities to a colony scent we studied whether King penguins (Aptenodytes patagonicus) could detect the smell of sand, feathers or feces by holding presentations beneath their beaks while they naturally slept on the beach. Penguins had a significantly greater response to the feathers and feces presentations than to sand. Although only a first step in exploring a broader role of olfaction in this species, our results raise the possibility of olfaction being used by King penguins in three potential ways: (1) locating the colony from the water or the shore, (2) finding the rendezvous zone within the colony where a chick or partner may be found, or (3) recognizing individuals by scent, as in Humboldt penguins (Spheniscus demersus).
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6253 |
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Title |
The early life of king penguins: ontogeny of dive capacity and foraging behaviour in an expert diver |
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Year |
2021 |
Publication |
The Journal of Experimental Biology |
Abbreviated Journal |
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Volume |
224 |
Issue |
12 |
Pages |
jeb242512 |
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Keywords |
Animals Behavior, Animal Bio-logging Diving Feeding Behavior Foraging proficiency Ontogeny Seabirds Spheniscidae Temperature Wiggles |
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137,394 |
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Bachelor's thesis |
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1477-9145 |
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8473 |
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Laboratory study of nitrate photolysis in Antarctic snow. II. Isotopic effects and wavelength dependence |
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2014 |
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The Journal of Chemical Physics |
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140 |
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244306 |
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1011 |
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0021-9606 |
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4917 |
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