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- Nord, Andreas
(author)
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De första svenska fynden av parköronvivel Otiorhynchus crataegi Germar, 1824 (Coleoptera: Curculionidae)
- 2022
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In: Fazett. - 1100-2425. ; 35:1, s. 31-37
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Journal article (other academic/artistic)abstract
- crataegi Germar, 1824. The first specimen was found in the city of Malmö in the southernmost province of Sweden in the beginning of October 2020, where one individual had taken shelter from a heavy morning rain on a house wall, together with several other beetle species. The species was subsequently sought after during late autumn and winter by sifting litter beneath putative host plants, but it could not be relocated until May 2021 when a large, but local, population was found in a scarlet firethorn (Pyracantha coccinea) hedge some hundred metres from the original location. The species has since then been observed in the same hedge on numerous occasions, suggesting that O. crataegi might be established in southernmost Sweden. Its sudden appearance in Sweden seems to be the result of an unintentional introduction with ornamental hedging plants from continental Europe rather than of a natural range expansion from nearby Denmark.
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| 2. |
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Avian Behavioral and Physiological Responses to Challenging Thermal Environments and Extreme Weather Events
- 2022
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Editorial collection (peer-reviewed)abstract
- Birds occupy habitats ranging from Antarctic ice shelves and Arctic tundra to low-latitude deserts and lowland rainforests, and so are exposed to the full range of climates present on Earth. Cold, hot, or variable (on a variety of temporal scales) thermal conditions can present significant thermoregulatory challenges to birds, which typically must maintain body temperatures within narrow physiological tolerance limits. Such challenges may occur in all stages of the annual cycle and in all life stages of birds, so the ability to adjust to these conditions is required to maintain stable populations through time. For this Research Topic, we broadly define a challenging thermal environment as one necessitating behavioral or physiological adjustments to maintain body temperatures at levels appropriate for continued physiological function.Avian abilities to respond to extreme cold and heat are defined by thermoregulatory capacities for heat production or dissipation, respectively. Behavioral responses to temperature challenges can reduce the necessity for and magnitude of physiological adjustments, so together, physiological capacities and behavioral responses determine the probability of survival in thermally challenging situations. Moreover, thermal conditions experienced during reproduction can affect parental investment in the nesting effort and, independently, alter the course of nestling development, with potentially long-term consequences. Behavioral responses to these conditions as well as physiological responses at multiple levels of organization, from organisms to molecules, allow birds to tolerate thermal challenges. Our knowledge of the mechanisms by which birds respond, the time course for such responses, and the impacts on fitness, however, remain incompletely understood. Studies examining behavioral and physiological responses of birds to extreme and/or seasonally variable climates have been a research focus for decades, but recent advances in methods of measurement and analyses of physiological and behavioral traits have led to novel findings regarding the patterns and mechanisms by which birds adjust to challenging thermal environments.This Research Topic examines how thermal conditions in the environment pose challenges to birds and the physiological and behavioral adjustments that birds employ to meet them. Articles for this Research Topic may be original research papers, reviews, or perspectives. Specific themes that we believe are suitable for this Research Topic include, but are not limited to:• Integrative mechanisms underlying bird thermoregulatory capacities contributing to a tolerance of challenging thermal environments and their links to fitness• Influence of thermal conditions during reproduction on parental investment or nestling development• Behavioral responses to challenging thermal conditions and their mechanistic underpinnings• Time courses for physiological adjustments to environmental temperature variation• Physiological and behavioral flexibility associated with daily or seasonal temperature variation• Physiological and behavioral responses and tolerance limits during extreme weather events• Body temperature regulation under challenging thermal conditions and energy or water restrictions, including real-time field measurements and thermal imaging• Body temperature regulation and environmental or ecological drivers of hypometabolic strategies• Physiological consequences of exceeding thermoregulatory capacities
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| 3. |
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| 4. |
- Nord, Andreas, et al.
(author)
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Så håller sig fåglarna svala i värmen
- 2022
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In: Forskning & framsteg. - 0015-7937. ; :5, s. 34-39
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Journal article (pop. science, debate, etc.)abstract
- Strupfladder och flämtandning är några av tricken som fåglar tar till för att överleva höga temperaturer. I en allt varmare framtid kanske det inte räcker, skriver fågelforskarna Andreas Nord och Susan J. Cunningham.
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| 5. |
- Strauß, Aurelia F.T., et al.
(author)
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Using skin temperature and activity profiles to assign chronotype in birds
- 2022
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In: Animal Biotelemetry. - : Springer Science and Business Media LLC. - 2050-3385. ; 10:1
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Journal article (peer-reviewed)abstract
- Chronotypes describe consistent differences between individuals in biological time-keeping. They have been linked both with underlying variation in the circadian system and fitness. Quantification of chronotypes is usually by time of onset, midpoint, or offset of a rhythmic behaviour or physiological process. However, diel activity patterns respond flexibly to many short-term environmental influences, which can make chronotypes hard to identify. In contrast, rhythmic patterns in physiological processes, such as body temperature, may provide more robust insights into the circadian basis of chronotypes. These can be telemetrically recorded from skin-mounted, temperature-sensitive transmitters, offering minimally invasive opportunities for working on free-ranging animals in the wild. Currently, computational methods for deriving chronotype from skin temperature require further development, as time series are often noisy and incomplete. Here, we investigate such methods using simultaneous radio telemetry recordings of activity and skin temperature in a wild songbird model (Great Tit Parus major) temporarily kept in outdoor aviaries. Our aims were to first develop standardised selection criteria to filter noisy time series of skin temperature and activity, to second assign chronotype based on the filtered recordings, and to third compare chronotype as assigned based on each of the two rhythms. After the selection of rhythmic data using periodicity and autocorrelation parameters, chronotype estimates (onset and offset) were extracted using four different changepoint approaches for skin temperature and one approach for activity records. The estimates based on skin temperature varied between different approaches but were correlated to each other (onset: correlation coefficient r = 0.099–0.841, offset: r = 0.131–0.906). In contrast, chronotype estimates from skin temperature were more weakly correlated to those from activity (onset: r = −0.131–0.612, offset: r = −0.040– −0.681). Overall, chronotype estimates were less variable and timed later in the day for activity than for skin temperature. The distinctions between physiological and behavioural chronotypes in this study might reflect differences in underlying mechanisms and in responsiveness to external and internal cues. Thus, studying each of these rhythms has specific strengths, while parallel studies of both could inform broadly on natural variation in biological time-keeping, and may allow assessment of how biological rhythms relate to changes in the environment.
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