Intraerythrocytic organic phosphates and hemoglobins of skua - Catharacta maccormicki (Stercoraridae): at two different stages of the year in relation to Antartic migration

Landini, Gustavo Fraga; Neto, Alfredo Di Vito; Schwantes, Arno Rudi; Schwantes, Maria Luiza B.; Santos, Marcelo dos

doi:10.1590/s1516-89132013000400010

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…No additional seasonal changes in haematology were observed, in contrast to previous findings of increased haemoglobin concentration and haematocrit during migration in songbirds ( Krause et al, 2016 ). Hb–O 2 affinity could be altered in these species by changes in inositol pentaphosphate concentrations (an allosteric modifier; Landini et al, 2013 ) or the proportions of HbA/HbD, as HbD is known to have a stronger binding affinity than HbA ( Storz, 2016 ). The varying seasonal responses in haematology highlight that there does not appear to be a single optimal phenotype at this step of the O 2 cascade in migratory songbirds.…”

Section: Discussionmentioning

confidence: 99%

Migratory songbirds exhibit seasonal modulation of the oxygen cascade

Ivy

Guglielmo

2023

Journal of Experimental Biology

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Migratory flight requires birds to maintain intensive aerobic exercise for many hours or days. Maintaining O2 supply to flight muscles is therefore important during migration, especially since migratory songbirds have been documented flying at altitudes greater than 5,000 m above sea level, where O2 is limited. Whether songbirds exhibit seasonal plasticity of the O2 cascade to maintain O2 uptake and transport during migratory flight is not well understood. We investigated changes in the hypoxic ventilatory response, haematology, and pectoralis (flight) muscle phenotype of 6 songbird species from 3 families during migratory and non-migratory conditions. Songbirds were captured during southbound migration in southern Ontario, Canada. Half of the birds were assessed during migration, and the rest were transitioned onto a winter photoperiod to induce a non-migratory phenotype and measured. All species exhibited seasonal plasticity at various stages along the O2 cascade, but not all species exhibited the same responses. Broadly, songbirds were more hypoxia tolerant during migration, withstanding 5 kPa O2, and breathed more effectively through slower, deeper breaths. Warblers had a stronger haemoglobin-O2 affinity during fall migration (decrease of ∼4.7 Torr), while the opposite was observed in thrushes (increase of ∼2.6 Torr). In the flight muscle there was an ∼1.2-fold increase in the abundance of muscle fibers with smaller fiber transverse areas during fall migration, but no changes in capillary-fiber ratio. These adjustments would enhance O2 uptake and transport to the flight muscle. Our findings demonstrate that in the O2 cascade there is no ideal migratory phenotype for all songbirds.

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Section: Discussionmentioning

confidence: 99%

Migratory songbirds exhibit seasonal modulation of the oxygen cascade

Ivy

Guglielmo

2023

Journal of Experimental Biology

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“…The species has a capacity for long flights related to the long migratory routes that it performs ( Fig.1) and, according to Azevedo-Júnior et al (2002), analysis of the species flight capacity has led to the conclusion that C. pusilla can fly up to 3,545.77 kilometers. Due to the importance that displacement has to this bird, part of its anatomical characteristics is related to the flight, which is its main form of displacement (Landini et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Morphometry of pectoral muscle fiber and intestinal villi of Calidris pusilla during the wintering period in Brazil

et al. 2018

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Migration is an event observed in several animals, such as shorebirds moving between the northern and southern hemispheres, during breeding and wintering intervals. Morphophysiological adaptations are necessary to allow the maintenance of migratory cycles and, therefore, studies with this focus can help clarify biological aspects related to migration. We analyzed the morphology variation in pectoral muscles and intestinal mucosa of Calidris pusilla, during different phases of the wintering period on the coast of Brazil. Fragments of pectoral muscles and duodenal were collected, fixed and processed for histology according to standard procedure, from specimens captured in a locality on the Brazilian coast. Modifications were found in the measured parameters among the three phases of wintering, arrival in Brazil (October, mid-period), January and departure to the Northern Hemisphere - May. The registered structural dynamism characterizes the growth of flight musculature and intestinal changes related to nutrition. Such changes occur temporarily due to the activities of preparation and migration between the northern and southern hemispheres.

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Intraerythrocytic organic phosphates and hemoglobins of skua - Catharacta maccormicki (Stercoraridae): at two different stages of the year in relation to Antartic migration

Abstract: Catharacta maccormicki blood samples were collected in the winter (October) and in the summer (February)

Cited by 2 publications

References 29 publications

Migratory songbirds exhibit seasonal modulation of the oxygen cascade

Migratory songbirds exhibit seasonal modulation of the oxygen cascade

Morphometry of pectoral muscle fiber and intestinal villi of Calidris pusilla during the wintering period in Brazil

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