Resources for Long Distance Migration: Intertidal Exploitation of Littorina and Mytilus by Knots Calidris Canutus in Iceland

Oikos ◽  
1992 ◽  
Vol 65 (2) ◽  
pp. 179 ◽  
Author(s):  
Thomas Alerstam ◽  
Gudmundur A. Gudmundsson ◽  
Kerstin Johannesson
Keyword(s):  
Long Distance ◽  
Calidris Canutus

scholarly journals Variability in Basal Metabolic Rate of a Long-Distance Migrant Shorebird (Red Knot, Calidris canutus) Reflects Shifts in Organ Sizes

1996 ◽  
Vol 69 (1) ◽  
pp. 191-217 ◽  
Author(s):  
Theunis Piersma ◽  
Leo Bruinzeel ◽  
Rudolf Drent ◽  
Marcel Kersten ◽  
Jaap Van der Meer ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Long Distance ◽  
Calidris Canutus ◽  
Organ Sizes ◽  
Red Knot

Unravelling the migration and moult strategies of a long-distance migrant using stable isotopes: Red Knot Calidris canutus movements in the Americas

Ibis ◽  
2005 ◽  
Vol 147 (4) ◽  
pp. 738-749 ◽  
Author(s):  
PHILIP W. ATKINSON ◽  
ALLAN J. BAKER ◽  
RICHARD M. BEVAN ◽  
NIGEL A. CLARK ◽  
KIMBERLY B. COLE ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Long Distance ◽  
Calidris Canutus ◽  
Red Knot

Optimal fat loads and long-distance flights by migrating Knots Calidris canutus, Sanderlings C. alba and Turnstones Arenaria interpres

Ibis ◽  
2008 ◽  
Vol 133 (2) ◽  
pp. 140-152 ◽  
Author(s):  
GUDMUNDUR A. GUDMUNDSSON ◽  
ÅKE LINDSTRÖM ◽  
THOMAS ALERSTAM
Keyword(s):  
Long Distance ◽  
Calidris Canutus

scholarly journals Travelling on a budget: predictions and ecological evidence for bottlenecks in the annual cycle of long-distance migrants

2007 ◽  
Vol 363 (1490) ◽  
pp. 247-266 ◽  
Author(s):  
Deborah M Buehler ◽  
Theunis Piersma
Keyword(s):  
Annual Cycle ◽  
Migratory Birds ◽  
Driving Forces ◽  
Long Distance ◽  
Annual Cycles ◽  
Calidris Canutus ◽  
Trade Offs ◽  
Breeding Grounds ◽  
Breeding Plumage ◽  
Red Knot

Long-distance migration, and the study of the migrants who undertake these journeys, has fascinated generations of biologists. However, many aspects of the annual cycles of these migrants remain a mystery as do many of the driving forces behind the evolution and maintenance of the migrations themselves. In this article we discuss nutritional, energetic, temporal and disease - risk bottlenecks in the annual cycle of long-distance migrants, taking a sandpiper, the red knot Calidris canutus , as a focal species. Red knots have six recognized subspecies each with different migratory routes, well-known patterns of connectivity and contrasting annual cycles. The diversity of red knot annual cycles allows us to discuss the existence and the effects of bottlenecks in a comparative framework. We examine the evidence for bottlenecks focusing on the quality of breeding plumage and the timing of moult as indicators in the six subspecies. In terms of breeding plumage coloration, quality and timing of prealternate body moult (from non-breeding into breeding plumage), the longest migrating knot subspecies, Calidris canutus rogersi and Calidris canutus rufa , show the greatest impact of bottlenecking. The same is true in terms of prebasic body moult (from breeding into non-breeding plumage) which in case of both C. c. rogersi and C. c. rufa overlaps with southward migration and may even commence in the breeding grounds. To close our discussion of bottlenecks in long-distance migrants, we make predictions about how migrants might be impacted via physiological ‘trade-offs’ throughout the annual cycle, using investment in immune function as an example. We also predict how bottlenecks may affect the distribution of mortality throughout the annual cycle. We hope that this framework will be applicable to other species and types of migrants, thus expanding the comparative database for the future evaluation of seasonal selection pressures and the evolution of annual cycles in long-distance migrants. Furthermore, we hope that this synthesis of recent advancements in the knowledge of red knot annual cycles will prove useful in the ongoing attempts to model annual cycles in migratory birds.

scholarly journals Global flyway evolution in red knots Calidris canutus and genetic evidence for a Nearctic refugium

2021 ◽  
Author(s):  
Jesse Conklin ◽  
Yvonne Verkuil ◽  
Philip Battley ◽  
Chris Hassell ◽  
James Johnson ◽  
...  
Keyword(s):  
Population Structure ◽  
Genetic Structure ◽  
Annual Cycle ◽  
Secondary Contact ◽  
Migration Behavior ◽  
Nucleotide Polymorphisms ◽  
Long Distance ◽  
Calidris Canutus ◽  
Breeding Populations ◽  
Approximate Bayesian

Present-day ecology and population structure are the legacies of past climate and habitat perturbations, and this is particularly true for species that are widely distributed at high latitudes. The red knot, Calidris canutus, is an arctic-breeding, long-distance migratory shorebird with six recognized subspecies defined by differences in morphology, migration behavior, and annual-cycle phenology, in a global distribution thought to have arisen just since the Last Glacial Maximum (LGM). We used nextRAD sequencing of 10,881 single-nucleotide polymorphisms (SNPs) to assess the neutral genetic structure and phylogeographic history of 172 red knots representing all known global breeding populations. Using population genetics approaches, including model-based scenario-testing in an approximate Bayesian computation (ABC) framework, we infer that red knots derive from two main lineages that diverged ca. 34,000 years ago, and thus persisted at the LGM in both Palearctic and Nearctic refugia, followed by at least two instances of secondary contact and admixture. In two flyways, we detected clear genetic structure between population pairs with similar migrations and substantial geographic overlap in the non-breeding season. Conversely, other populations were only weakly differentiated despite clearly divergent migratory phenotypes and little or no apparent contact throughout the annual cycle. In general, the magnitude of genetic differentiation did not match that of phenotypic differences among populations, suggesting that flyway-specific phenotypes developed quite rapidly and do not necessarily impose barriers to gene flow. Our results suggest that population structure and migratory phenotypes in red knots arose from a complex interplay among phylogeography, plasticity, and selective processes.

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