Identical metabolic rate and thermal conductance in Rock Sandpiper<i>(Calidris ptilocnemis)</i>subspecies with contrasting nonbreeding life histories

Ruthrauff, Daniel R.; Dekinga, Anne; Gill, Robert E.; Piersma, Theunis

doi:10.1525/auk.2012.12081

Cited by 9 publications

(20 citation statements)

References 65 publications

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“…Despite these predicted differences in site-specific metabolic rates, the basic metabolic capacities of these two subspecies do not differ. Ruthrauff et al (2013a) determined that the basal metabolic rates, metabolic responses to cold and thermal conductance values did not differ between the two subspecies maintained under identical laboratory conditions. It was posited that, under natural settings, the two subspecies acclimated to their respective environmental conditions, a phenotypically flexible response that enables increased metabolic capacities at lower temperatures (Ruthrauff et al, 2013a;Vézina et al, 2011).…”

Section: The Study Systemmentioning

confidence: 99%

“…Ruthrauff et al (2013a) determined that the basal metabolic rates, metabolic responses to cold and thermal conductance values did not differ between the two subspecies maintained under identical laboratory conditions. It was posited that, under natural settings, the two subspecies acclimated to their respective environmental conditions, a phenotypically flexible response that enables increased metabolic capacities at lower temperatures (Ruthrauff et al, 2013a;Vézina et al, 2011). Because the two subspecies do not differ in their intrinsic metabolic capacities, we hypothesized that the consistently higher energetic demands of ptilocnemis during winter compared with tschuktschorum would be supported by innate differences in foraging ecologies.…”

Section: The Study Systemmentioning

confidence: 99%

“…There are four recognized subspecies of rock sandpiper (American Ornithologists' Union, 1957;Conover, 1944) and the extremes of the species' nonbreeding distribution are occupied by ptilocnemis to the north and tschuktschorum to the south (Gill et al, 2002). This wide latitudinal range exposes these two subspecies to starkly contrasting environmental conditions and is reflected by predicted mid-winter maintenance metabolic rates over 30% higher in ptilocnemis compared with tschuktschorum (Ruthrauff et al, 2013a). Despite these predicted differences in site-specific metabolic rates, the basic metabolic capacities of these two subspecies do not differ.…”

Section: The Study Systemmentioning

confidence: 99%

“…Although the winter (October-April) nonbreeding ranges and habitat affinities of ptilocnemis and tschuktschorum have received little formal study (Gill et al, 2002;Ruthrauff et al, 2013a), observations suggest broad contrasts between the subspecies in these traits. Ptilocnemis is distributed primarily on mudflat habitats in upper Cook Inlet, Alaska (61°N, 151°W) during winter (Gill et al, 2002;Ruthrauff et al, 2013b).…”

Section: The Study Systemmentioning

confidence: 99%

“…body size, bill morphology, diets, foraging behaviors), but endure strongly contrasting environmental conditions across their largely allopatric nonbreeding ranges (e.g. table 1 in Ruthrauff et al, 2013a). We conducted experimental foraging trials on captive individuals of both subspecies maintained under identical conditions to determine whether their distinct nonbreeding life histories are reflected by inherent differences in foraging ecologies.…”

Section: Introductionmentioning

confidence: 99%

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Ways to be different: foraging adaptations that facilitate higher intake rates in a northerly-wintering shorebird compared to a low-latitude conspecific

Ruthrauff

Dekinga

Gill

et al. 2015

Journal of Experimental Biology

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At what phenotypic level do closely related subspecies that live in different environments differ with respect to food detection, ingestion and processing? This question motivated an experimental study on rock sandpipers (Calidris ptilocnemis). The species' nonbreeding range spans 20 deg of latitude, the extremes of which are inhabited by two subspecies: C. p. ptilocnemis that winters primarily in upper Cook Inlet, Alaska (61°N) and C. p. tschuktschorum that overlaps slightly with C. p. ptilocnemis but whose range extends much farther south (∼40°N). In view of the strongly contrasting energetic demands of their distinct nonbreeding distributions, we conducted experiments to assess the behavioral, physiological and sensory aspects of foraging and we used the bivalve Macoma balthica for all trials. C. p. ptilocnemis consumed a wider range of prey sizes, had higher maximum rates of energy intake, processed shell waste at higher maximum rates and handled prey more quickly. Notably, however, the two subspecies did not differ in their abilities to find buried prey. The subspecies were similar in size and had equally sized gizzards, but the more northern ptilocnemis individuals were 10-14% heavier than their same-sex tschuktschorum counterparts. The higher body mass in ptilocnemis probably resulted from hypertrophy of digestive organs (e.g. intestine, liver) related to digestion and nutrient assimilation. Given the previously established equality of the metabolic capacities of the two subspecies, we propose that the high-latitude nonbreeding range of ptilocnemis rock sandpipers is primarily facilitated by digestive (i.e. physiological) aspects of their foraging ecology rather than behavioral or sensory aspects.

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Section: The Study Systemmentioning

confidence: 99%

Section: The Study Systemmentioning

confidence: 99%

Section: The Study Systemmentioning

confidence: 99%

Section: The Study Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ways to be different: foraging adaptations that facilitate higher intake rates in a northerly-wintering shorebird compared to a low-latitude conspecific

Ruthrauff

Dekinga

Gill

et al. 2015

Journal of Experimental Biology

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Does wintering north or south of the Sahara correlate with timing and breeding performance in black‐tailed godwits?

Kentie

Márquez‐Ferrando

Figuerola

et al. 2017

Ecology and Evolution

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Migrating long distances requires time and energy, and may interact with an individual's performance during breeding. These seasonal interactions in migratory animals are best described in populations with disjunct nonbreeding distributions. The black‐tailed godwit (Limosa limosa limosa), which breeds in agricultural grasslands in Western Europe, has such a disjunct nonbreeding distribution: The majority spend the nonbreeding season in West Africa, while a growing number winters north of the Sahara on the Iberian Peninsula. To test whether crossing the Sahara has an effect on breeding season phenology and reproductive parameters, we examined differences in the timing of arrival, breeding habitat quality, lay date, egg volume, and daily nest survival among godwits (154 females and 157 males), individually marked in a breeding area in the Netherlands for which wintering destination was known on the basis of resightings. We also examined whether individual repeatability in arrival date differed between birds wintering north or south of the Sahara. Contrary to expectation, godwits wintering south of the Sahara arrived two days earlier and initiated their clutch six days earlier than godwits wintering north of the Sahara. Arrival date was equally repeatable for both groups, and egg volume larger in birds wintering north of the Sahara. Despite these differences, we found no association between wintering location and the quality of breeding habitat or nest survival. This suggests that the crossing of an important ecological barrier and doubling of the migration distance, twice a year, do not have clear negative reproductive consequences for some long‐distance migrants.

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Toxicological and thermoregulatory effects of feather contamination with artificially weathered MC 252 oil in western sandpipers ( Calidris mauri )

Maggini

Kennedy

Bursian

et al. 2017

Ecotoxicology and Environmental Safety

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Identical metabolic rate and thermal conductance in Rock Sandpiper(Calidris ptilocnemis)subspecies with contrasting nonbreeding life histories

Cited by 9 publications

References 65 publications

Ways to be different: foraging adaptations that facilitate higher intake rates in a northerly-wintering shorebird compared to a low-latitude conspecific

Ways to be different: foraging adaptations that facilitate higher intake rates in a northerly-wintering shorebird compared to a low-latitude conspecific

Does wintering north or south of the Sahara correlate with timing and breeding performance in black‐tailed godwits?

Toxicological and thermoregulatory effects of feather contamination with artificially weathered MC 252 oil in western sandpipers ( Calidris mauri )

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