Assessing seasonal changes in animal diets with stable-isotope analysis of amino acids: a migratory boreal songbird switches diet over its annual cycle

Oecologia, Journal Year: 2018, Volume and Issue: 187(1), P. 1 - 13

Published: March 22, 2018

Language: Английский

---

Post‐migratory nonbreeding movements of birds: A review and case study

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(3)

Published: March 1, 2023

Abstract Seasonal migrations are fascinating and ecologically important, but many migratory species declining as climate change land‐use alter the habitats used by migrants across annual cycle. While some birds use a single wintering site, others undertake large‐scale post‐migratory movements during nonbreeding season. Technological advances that enable tracking individual uncovering more examples of movements. Documenting these is important for conservation, which requires understanding when where throughout their range. Here, we reviewed existing literature collected information on 92 bird from 18 orders six continents. Among records, most commonly reported drivers were resource availability climate. This strong dependence birds' abiotic biotic environments suggests environmental will impact patterns potentially fitness them. We also in North American‐breeding thrushes genus Catharus to examine five closely related species. find less territorial likely multiple sites season; however, there little evidence dietary, evolutionary, or differences between thrush move winter those stationary. believe our study represents comprehensive list exhibiting date, biases sampling, lack common terminology movements, still‐nascent inexpensive, lightweight devices mean probably populations such Future research into consequences ecosystem services would advance conservation importance evolution.

Language: Английский

---

Transcriptome signatures of the lipid metabolism in the liver and partial characterisation of the plasma phospholipidome of a long-distance migratory bird, the Northern Wheatear (Oenanthe oenanthe)

Comparative Biochemistry and Physiology Part D Genomics and Proteomics, Journal Year: 2025, Volume and Issue: 55, P. 101452 - 101452

Published: Feb. 21, 2025

Language: Английский

---

Conservation‐focused mapping of avian migratory routes using a pan‐European automated telemetry network

Conservation Biology, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Accelerated biodiversity loss has destabilized functional links within and between ecosystems. Species that cross different ecosystems during migration breeding nonbreeding sites are particularly sensitive to global change because they exposed various, often ecosystem-specific, threats. Because these threats have lethal nonlethal effects on populations, many migratory species declining, making this group especially vulnerable change. To mitigate their decline, research at a continental flyway scale is required adequately monitor changes in the demographic processes of populations all parts annual cycle. The Motus Wildlife Tracking System (Motus) could provide solution data gaps exist for small, species. an automated telemetry system animal tracking uses single very-high-frequency radio signal track tagged individuals. can information movements made by individuals small migrant species, thereby aiding understanding aspects affect parameters. Conservation-focused opportunities related include identification critical stopover support connect multiple insight into decisions birds environmental stressors, such as artificial light night. Examples studies from existing network demonstrate its utility high-conservation-value area blackpoll warbler (Setophaga striata) eastern United States. Geographical across Mediterranean region Europe need be filled continent-wide movements. individual-level variety small-bodied taxa, drive expand will improve ability direct conservation plans

Language: Английский

---

Behavioral Patterns, Rather Than Environmental Factors, Shape the Energy Balance of Wintering Chinese Mergansers (Mergus squamatus) in Huangshan

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(4)

Published: April 1, 2025

Animal energy intake and expenditure strategies in response to environmental fluctuations have been widely studied. Optimal foraging theory (OFT) is the dominant framework this field; however, studies addressing OFT endangered waterbird species are lacking. To address gap our knowledge, we collected behavioral data investigated habitat variables that influence of Chinese merganser (Mergus squamatus ) Changjiang, Shuaishui, Jianjiang Rivers Huangshan, Anhui Province, China, from January March 2023. The results revealed a correlation between net energy, intake, rates. Successful frequencies increased rates reduced feeding time. Furthermore, running on water, flying, diving, average fish weight rates, whereas successful frequencies, vigilance, resting, biomass, river width, eye-submerging decreased mergansers adjusted time allocations regulate expenditure, were independent factors, excluding weight, width. behaviors influencing balance modified factors. However, factors did not affect levels through behaviors. These elucidate used by variations their wintering habitats. They provide valuable insights for conserving managing habitats critical survival other species.

Language: Английский

---

Waterfowl recently infected with low pathogenic avian influenza exhibit reduced local movement and delayed migration

Ecosphere, Journal Year: 2023, Volume and Issue: 14(2)

Published: Feb. 1, 2023

Abstract Understanding relationships between infection and wildlife movement patterns is important for predicting pathogen spread, especially multispecies pathogens those that can spread to humans domestic animals, such as avian influenza viruses (AIVs). Although with low pathogenic AIVs generally considered asymptomatic in wild birds, prior work has shown influenza‐infected birds occasionally delay migration and/or reduce local movements relative their uninfected counterparts. However, most observational research date focused on a few species northern Europe; given are widespread globally outbreaks of highly strains increasingly common, it explore influenza–movement across more regions. Here, we used telemetry data investigate behavior 165 individuals from four North American waterfowl overwinter California, USA. We studied both large‐scale migratory overwintering found varied among species. Northern pintails ( Anas acuta ) antibodies influenza, indicating infection, made stopovers averaged 12 days longer than no antibodies. In contrast, greater white‐fronted geese Anser albifrons 15 shorter Canvasbacks Aythya valisineria were actively infected upon capture the winter delayed spring by an average 28 at time capture. At scale, canvasbacks areas 7.6 4.9 times smaller ducks, respectively, during period presumed active infection. evidence influence mallards platyrhynchos ). These results suggest illustrate bird context‐ species‐dependent. More generally, understanding multihost requires studying multiple taxa space time.

Language: Английский

---

Competition is a major limiting factor of refueling in migratory passerines during stopover

Journal of Avian Biology, Journal Year: 2023, Volume and Issue: 2023(11-12)

Published: July 25, 2023

For an avian migrant, refueling capacity attainable during stopovers governs the entire migration schedule and, ultimately, its fitness. Specifically, timely replenishing energy stores is critical when involves crossing ecological barriers, within which may be limited. Here, we tested hypothesis that fuel deposition rates (FDRs) of migratory passerines barrier‐edge stopover sites are constrained by density potential competitors, irrespective season, phenology, and local environmental conditions. We also evaluated diverse intra‐ inter‐specific competition scenarios explored a mediation density‐dependence factors. The analyzed data, collected us over 13 consecutive years (2009–2022), contain information on seven species long‐distance insectivorous measured eight desert‐edge habitats throughout autumn spring migrations. As predicted, our analyses revealed negative regulation FDRs, consistent across seasons. Notably, bird exerted effect above beyond other factors known to influence FDR, such as relative ambient temperature, temporal progress stopover, body mass next landfall. expected, FDR increased at higher temperatures with stopover's progress. In spring, rose season advanced. These findings signify substantial impact performance their barrier's edge, acting detected importance interrelation predictors provides insight into functioning; environmentally imposed inescapable interspecific interference thus significant limiting factor deleterious relationship potentially remediable informed habitat restoration planning.

Language: Английский

---

Non‐lethal effects of climate change and infectious disease: An energetics approach to understanding population impacts

Functional Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract Climate change and infectious disease jointly impact species worldwide. In addition to causing conspicuous mortality events, these threats produce a range of non‐lethal effects that are often overlooked, yet can affect individual survival fecundity, ultimately, population viability. We develop an energetic framework structures the study climate their downstream demographic consequences. The identifies pathways by which acquisition, storage mobilisation energy required for organismal reproduction. joint disease, while non‐lethal, reduce fitness increasing demands, exacerbating trade‐offs accelerating physiological ageing. Considering mechanisms underlying explain when why recurrent and/or chronic events associated with be important limiting forces populations species. Read free Plain Language Summary this article on Journal blog.

Language: Английский

---

A mimicked bacterial infection prolongs stopover duration in songbirds—but more pronounced in short‐ than long‐distance migrants

Journal of Animal Ecology, Journal Year: 2018, Volume and Issue: 87(6), P. 1698 - 1708

Published: Aug. 13, 2018

Abstract Migration usually consists of intermittent travel and stopovers, the latter being crucially important for individuals to recover refuel successfully complete migration. Quantifying how sickness behaviours influence stopovers is crucial our understanding migration ecology diseases spread. However, little known about infections in songbirds, which constitute majority avian migrants. We experimentally immune‐challenged autumn migrating passerines (both short‐ long‐distance species) with a simulated bacterial infection. Using an automated radiotelemetry system stopover area, we subsequently quantified duration, “bush‐level” activity patterns (0.1–30 m) landscape movements (30–6,000 m). show that compared controls, birds prolonged their duration by on average 1.2 days 2.9 short‐distance migrants, respectively (100%–126% longer than respectively). During stopover, kept high (which was unexpected) but reduced local movements, independent strategy. Baseline immune function, not blood parasite prior challenge, had prolonging effect particularly conclude mimicked infection does cause lethargy, per se, restricts prolongs this behavioural response also depends status baseline function This adds new level acute inflammation affect behaviour hence evolution Accounting these effects will enable us fine‐tune apply optimal theory. Finally, it help predicting animals may respond increased pathogen pressure caused global change.

Language: Английский

---

Decision-making in migratory birds at stopover: an interplay of energy stores and feeding conditions

Behavioral Ecology and Sociobiology, Journal Year: 2020, Volume and Issue: 74(1)

Published: Jan. 1, 2020

Language: Английский

---