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Bauer S, Tielens EK, Haest B. Monitoring aerial insect biodiversity: a radar perspective. Philos Trans R Soc Lond B Biol Sci 2024; 379:20230113. [PMID: 38705181 PMCID: PMC11070259 DOI: 10.1098/rstb.2023.0113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 03/21/2024] [Indexed: 05/07/2024] Open
Abstract
In the current biodiversity crisis, populations of many species have alarmingly declined, and insects are no exception to this general trend. Biodiversity monitoring has become an essential asset to detect biodiversity change but remains patchy and challenging for organisms that are small, inconspicuous or make (nocturnal) long-distance movements. Radars are powerful remote-sensing tools that can provide detailed information on intensity, timing, altitude and spatial scale of aerial movements and might therefore be particularly suited for monitoring aerial insects and their movements. Importantly, they can contribute to several essential biodiversity variables (EBVs) within a harmonized observation system. We review existing research using small-scale biological and weather surveillance radars for insect monitoring and outline how the derived measures and quantities can contribute to the EBVs 'species population', 'species traits', 'community composition' and 'ecosystem function'. Furthermore, we synthesize how ongoing and future methodological, analytical and technological advancements will greatly expand the use of radar for insect biodiversity monitoring and beyond. Owing to their long-term and regional-to-large-scale deployment, radar-based approaches can be a powerful asset in the biodiversity monitoring toolbox whose potential has yet to be fully tapped. This article is part of the theme issue 'Towards a toolkit for global insect biodiversity monitoring'.
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Affiliation(s)
- Silke Bauer
- Swiss Federal Institute for Forest, Snow and Landscape Research, 8903 Birmensdorf, Switzerland
- Swiss Ornithological Institute, Sempach, LU 6204, Switzerland
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, 1090 GE Amsterdam, Noord-Holland, The Netherlands
- Department of Environmental System Science, Federal Institute of Technology (ETH), 8092 Zürich, Switzerland
| | - Elske K. Tielens
- School of Biological Sciences, University of Oklahoma, Norman, OK 73019-0390, USA
| | - Birgen Haest
- Swiss Ornithological Institute, Sempach, LU 6204, Switzerland
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Huang J, Feng H, Drake VA, Reynolds DR, Gao B, Chen F, Zhang G, Zhu J, Gao Y, Zhai B, Li G, Tian C, Huang B, Hu G, Chapman JW. Massive seasonal high-altitude migrations of nocturnal insects above the agricultural plains of East China. Proc Natl Acad Sci U S A 2024; 121:e2317646121. [PMID: 38648486 PMCID: PMC11067063 DOI: 10.1073/pnas.2317646121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 03/13/2024] [Indexed: 04/25/2024] Open
Abstract
Long-distance migrations of insects contribute to ecosystem functioning but also have important economic impacts when the migrants are pests or provide ecosystem services. We combined radar monitoring, aerial sampling, and searchlight trapping, to quantify the annual pattern of nocturnal insect migration above the densely populated agricultural lands of East China. A total of ~9.3 trillion nocturnal insect migrants (15,000 t of biomass), predominantly Lepidoptera, Hemiptera, and Diptera, including many crop pests and disease vectors, fly at heights up to 1 km above this 600 km-wide region every year. Larger migrants (>10 mg) exhibited seasonal reversal of movement directions, comprising northward expansion during spring and summer, followed by southward movements during fall. This north-south transfer was not balanced, however, with southward movement in fall 0.66× that of northward movement in spring and summer. Spring and summer migrations were strongest when the wind had a northward component, while in fall, stronger movements occurred on winds that allowed movement with a southward component; heading directions of larger insects were generally close to the track direction. These findings indicate adaptations leading to movement in seasonally favorable directions. We compare our results from China with similar studies in Europe and North America and conclude that ecological patterns and behavioral adaptations are similar across the Northern Hemisphere. The predominance of pests among these nocturnal migrants has severe implications for food security and grower prosperity throughout this heavily populated region, and knowledge of their migrations is potentially valuable for forecasting pest impacts and planning timely management actions.
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Affiliation(s)
- Jianrong Huang
- Henan Key Laboratory of Crop Pest Control, Key Laboratory for Integrated Crop Pests Management on Crops in Southern Region of North China, International Joint Research Laboratory for Crop Protection of Henan, No. 0 Entomological Radar Field Scientific Observation and Research Station of Henan Province, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou, Henan450002, China
- Centre for Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn, CornwallTR10 9FE, United Kingdom
| | - Hongqiang Feng
- Henan Key Laboratory of Crop Pest Control, Key Laboratory for Integrated Crop Pests Management on Crops in Southern Region of North China, International Joint Research Laboratory for Crop Protection of Henan, No. 0 Entomological Radar Field Scientific Observation and Research Station of Henan Province, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou, Henan450002, China
| | - V. Alistair Drake
- School of Science, UNSW Canberra, The University of New South Wales, Canberra, ACT2610, Australia
- Institute for Applied Ecology, Faculty of Science and Technology, University of Canberra, Canberra, ACT2617, Australia
| | - Don R. Reynolds
- Natural Resources Institute, University of Greenwich, Chatham, KentME4 4 TB, United Kingdom
- Department of Computational and Analytical Sciences, Rothamsted Research, Harpenden, HertsAL5 2JQ, United Kingdom
| | - Boya Gao
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
| | - Fajun Chen
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
| | - Guoyan Zhang
- Plant Protection and Quarantine Station of Henan Province, Zhengzhou, Henan450002, China
| | - Junsheng Zhu
- Shandong Agricultural Technology Extension Center, Jinan, Shandong250100, China
| | - Yuebo Gao
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
- Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Gongzhuling, Jilin136100, China
| | - Baoping Zhai
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
| | - Guoping Li
- Henan Key Laboratory of Crop Pest Control, Key Laboratory for Integrated Crop Pests Management on Crops in Southern Region of North China, International Joint Research Laboratory for Crop Protection of Henan, No. 0 Entomological Radar Field Scientific Observation and Research Station of Henan Province, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou, Henan450002, China
| | - Caihong Tian
- Henan Key Laboratory of Crop Pest Control, Key Laboratory for Integrated Crop Pests Management on Crops in Southern Region of North China, International Joint Research Laboratory for Crop Protection of Henan, No. 0 Entomological Radar Field Scientific Observation and Research Station of Henan Province, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou, Henan450002, China
| | - Bo Huang
- Henan Key Laboratory of Crop Pest Control, Key Laboratory for Integrated Crop Pests Management on Crops in Southern Region of North China, International Joint Research Laboratory for Crop Protection of Henan, No. 0 Entomological Radar Field Scientific Observation and Research Station of Henan Province, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou, Henan450002, China
| | - Gao Hu
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
| | - Jason W. Chapman
- Centre for Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn, CornwallTR10 9FE, United Kingdom
- Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing, Jiangsu210095, China
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McGuire LP, Leys R, Webber QMR, Clerc J. Heterothermic Migration Strategies in Flying Vertebrates. Integr Comp Biol 2023; 63:1060-1074. [PMID: 37279461 DOI: 10.1093/icb/icad053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/08/2023] Open
Abstract
Migration is a widespread and highly variable trait among animals. Population-level patterns arise from individual-level decisions, including physiological and energetic constraints. Many aspects of migration are influenced by behaviors and strategies employed during periods of stopover, where migrants may encounter variable or unpredictable conditions. Thermoregulation can be a major cost for homeotherms which largely encounter ambient temperatures below the lower critical temperature during migration, especially during the rest phase of the daily cycle. In this review we describe the empirical evidence, theoretical models, and potential implications of bats and birds that use heterothermy to reduce thermoregulatory costs during migration. Torpor-assisted migration is a strategy described for migrating temperate insectivorous bats, whereby torpor can be used during periods of inactivity to drastically reduce thermoregulatory costs and increase net refueling rate, leading to shorter stopover duration, reduced fuel load requirement, and potential consequences for broad-scale movement patterns and survival. Hummingbirds can adopt a similar strategy, but most birds are not capable of torpor. However, there is an increasing recognition of the use of more shallow heterothermic strategies by diverse bird species during migration, with similarly important implications for migration energetics. A growing body of published literature and preliminary data from ongoing research indicate that heterothermic migration strategies in birds may be more common than traditionally appreciated. We further take a broad evolutionary perspective to consider heterothermy as an alternative to migration in some species, or as a conceptual link to consider alternatives to seasonal resource limitations. There is a growing body of evidence related to heterothermic migration strategies in bats and birds, but many important questions related to the broader implications of this strategy remain.
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Affiliation(s)
- Liam P McGuire
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Ryan Leys
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Quinn M R Webber
- Department of Integrative Biology, University of Guelph,Guelph, ON N1G 2W1, Canada
| | - Jeff Clerc
- National Renewable Energy Laboratory, Golden, CO 80401, USA
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Wallace JRA, Dreyer D, Reber TMJ, Khaldy L, Mathews-Hunter B, Green K, Zeil J, Warrant E. Camera-based automated monitoring of flying insects in the wild (Camfi). II. flight behaviour and long-term population monitoring of migratory Bogong moths in Alpine Australia. FRONTIERS IN INSECT SCIENCE 2023; 3:1230501. [PMID: 38469465 PMCID: PMC10926487 DOI: 10.3389/finsc.2023.1230501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 08/21/2023] [Indexed: 03/13/2024]
Abstract
Introduction The Bogong moth Agrotis infusa is well known for its remarkable annual round-trip migration from its breeding grounds across eastern and southern Australia to its aestivation sites in the Australian Alps, to which it provides an important annual influx of nutrients. Over recent years, we have benefited from a growing understanding of the navigational abilities of the Bogong moth. Meanwhile, the population of Bogong moths has been shrinking. Recently, the ecologically and culturally important Bogong moth was listed as endangered by the IUCN Red List, and the establishment of a program for long-term monitoring of its population has been identified as critical for its conservation. Methods Here, we present the results of two years of monitoring of the Bogong moth population in the Australian Alps using recently developed methods for automated wildlife-camera monitoring of flying insects, named Camfi. While in the Alps, some moths emerge from the caves in the evening to undertake seemingly random flights, filling the air with densities in the dozens per cubic metre. The purpose of these flights is unknown, but they may serve an important role in Bogong moth navigation. Results We found that these evening flights occur throughout summer and are modulated by daily weather factors. We present a simple heuristic model of the arrival to and departure from aestivation sites by Bogong moths, and confirm results obtained from fox-scat surveys which found that aestivating Bogong moths occupy higher elevations as the summer progresses. Moreover, by placing cameras along two elevational transects below the summit of Mt. Kosciuszko, we found that evening flights were not random, but were systematically oriented in directions relative to the azimuth of the summit of the mountain. Finally, we present the first recorded observations of the impact of bushfire smoke on aestivating Bogong moths - a dramatic reduction in the size of a cluster of aestivating Bogong moths during the fire, and evidence of a large departure from the fire-affected area the day after the fire. Discussion Our results highlight the challenges of monitoring Bogong moths in the wild and support the continued use of automated camera-based methods for that purpose.
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Affiliation(s)
- Jesse Rudolf Amenuvegbe Wallace
- Research School of Biology, The Australian National University, Canberra, ACT, Australia
- National Collections & Marine Infrastructure, CSIRO, Parkville, VIC, Australia
| | - David Dreyer
- Lund Vision Group, Department of Biology, Lund University, Lund, Sweden
| | | | - Lana Khaldy
- Lund Vision Group, Department of Biology, Lund University, Lund, Sweden
| | | | - Ken Green
- College of Asia and the Pacific, The Australian National University, Canberra, ACT, Australia
| | - Jochen Zeil
- Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - Eric Warrant
- Research School of Biology, The Australian National University, Canberra, ACT, Australia
- Lund Vision Group, Department of Biology, Lund University, Lund, Sweden
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Hawkes WL, Davies K, Weston S, Moyes K, Chapman JW, Wotton KR. Bat activity correlated with migratory insect bioflows in the Pyrenees. ROYAL SOCIETY OPEN SCIENCE 2023; 10:230151. [PMID: 37593718 PMCID: PMC10427818 DOI: 10.1098/rsos.230151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 07/21/2023] [Indexed: 08/19/2023]
Abstract
High altitude mountain passes in the Pyrenees are known to be important migratory hotspots for autumn migrating insects originating from large swathes of northern Europe. In the Pyrenees, prior research has focused on diurnal migratory insects. In this study, we investigate the nocturnal component of the migratory assemblage and ask if this transient food source is also used by bat species. Three seasons of insect trapping revealed 66 species of four different orders, 90% of which were Noctuid moths, including the destructive pest Helicoverpa armigera, otherwise known as the cotton bollworm. Acoustic bat detectors revealed that high activity of Nyctalus spp. and Tadarida teniotis bats were closely synchronized with the arrival of the migratory moths, suggesting this food source is important for both resident and migratory bats to build or maintain energy reserves. Bats of the Nyctalus spp. are likely migrating through the study site using fly-and-forage strategies or stopping over in the area, while resident T. teniotis may be exploiting the abundant food source to build fat stores for hibernation. This study shows that nocturnal migratory insects are abundant in the Pyrenees during autumn and interact during migration, not only with their co-migrant bats but also with resident bat species.
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Affiliation(s)
- Will L. Hawkes
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
- Swiss Ornithological Institute, Sempach, Switzerland
| | - Kelsey Davies
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
| | - Scarlett Weston
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
| | - Kelly Moyes
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
| | - Jason W. Chapman
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
- Environment and Sustainability Institute, University of Exeter, Cornwall Campus, Penryn, UK
- Department of Entomology, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Karl R. Wotton
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, UK
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Zhu J, Chen X, Liu J, Jiang Y, Chen F, Lu J, Chen H, Zhai B, Reynolds DR, Chapman JW, Hu G. A cold high-pressure system over North China hinders the southward migration of Mythimna separata in autumn. MOVEMENT ECOLOGY 2022; 10:54. [PMID: 36457049 PMCID: PMC9716675 DOI: 10.1186/s40462-022-00360-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 11/29/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND In warm regions or seasons of the year, the planetary boundary layer is occupied by a huge variety and quantity of insects, but the southward migration of insects (in East Asia) in autumn is still poorly understood. METHODS We collated daily catches of the oriental armyworm (Mythimna separata) moth from 20 searchlight traps from 2014 to 2017 in China. In order to explore the autumn migratory connectivity of M. separata in East China, we analyzed the autumn climate and simulated the autumn migration process of moths. RESULTS The results confirmed that northward moth migration in spring and summer under the East Asian monsoon system can bring rapid population growth. However, slow southerly wind (blowing towards the north) prevailed over the major summer breeding area in North China (33°-40° N) due to a cold high-pressure system located there, and this severely disrupts the autumn 'return' migration of this pest. Less than 8% of moths from the summer breeding area successfully migrated back to their winter-breeding region, resulting in a sharp decline of the population abundance in autumn. As northerly winds (blowing towards the south) predominate at the eastern periphery of a high-pressure system, the westward movement of the high-pressure system leads to more northerlies over North China, increasing the numbers of moths migrating southward successfully. Therefore, an outbreak year of M. separata larvae was associated with a more westward position of the high-pressure system during the previous autumn. CONCLUSION These results indicate that the southward migration in autumn is crucial for sustaining pest populations of M. separata, and the position of the cold high-pressure system in September is a key environmental driver of the population size in the next year. This study indicates that the autumn migration of insects in East China is more complex than previously recognized, and that the meteorological conditions in autumn are an important driver of migratory insects' seasonal and interannual population dynamics.
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Affiliation(s)
- Jian Zhu
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
- State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiao Chen
- College of Life Science, International Cooperative Research Centre for Cross-Border Pest Management in Central Asia, Xinjiang Normal University, Urumqi, 830054, China
| | - Jie Liu
- China National Agro-Tech Extension and Service Center, Beijing, 100125, China
| | - Yuying Jiang
- China National Agro-Tech Extension and Service Center, Beijing, 100125, China
| | - Fajun Chen
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
| | - Jiahao Lu
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
- State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, Nanjing, 210095, China
- Songjiang District Agro-Technology Extension Center, Shanghai, 201613, China
| | - Hui Chen
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
- State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, Nanjing, 210095, China
| | - Baoping Zhai
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
| | - Don R Reynolds
- Natural Resources Institute, University of Greenwich, Chatham, ME4 4TB, UK
- Rothamsted Research, Harpenden, AL5 2JQ, UK
| | - Jason W Chapman
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China
- Centre of Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, TR10 9FE, UK
| | - Gao Hu
- Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, Nanjing, 210095, China.
- State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, Nanjing, 210095, China.
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Clem CS, Hobson KA, Harmon‐Threatt AN. Do Nearctic hover flies (Diptera: Syrphidae) engage in long‐distance migration? An assessment of evidence and mechanisms. ECOL MONOGR 2022. [DOI: 10.1002/ecm.1542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- C. Scott Clem
- Department of Entomology University of Georgia Athens Georgia USA
- Department of Entomology University of Illinois at Urbana‐Champaign Urbana Illinois USA
| | - Keith A. Hobson
- Environment and Climate Change Canada Saskatoon Saskatchewan Canada
- Department of Biology University of Western Ontario London Ontario Canada
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Hedlund JSU, Lv H, Lehmann P, Hu G, Anderson RC, Chapman JW. Unraveling the World’s Longest Non-stop Migration: The Indian Ocean Crossing of the Globe Skimmer Dragonfly. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.698128] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Insect migration redistributes enormous quantities of biomass, nutrients and species globally. A subset of insect migrants perform extreme long-distance journeys, requiring specialized morphological, physiological and behavioral adaptations. The migratory globe skimmer dragonfly (Pantala flavescens) is hypothesized to migrate from India across the Indian Ocean to East Africa in the autumn, with a subsequent generation thought to return to India from East Africa the following spring. Using an energetic flight model and wind trajectory analysis, we evaluate the dynamics of this proposed transoceanic migration, which is considered to be the longest regular non-stop migratory flight when accounting for body size. The energetic flight model suggests that a mixed strategy of gliding and active flapping would allow a globe skimmer to stay airborne for up to 230–286 h, assuming that the metabolic rate of gliding flight is close to that of resting. If engaged in continuous active flapping flight only, the flight time is severely reduced to ∼4 h. Relying only on self-powered flight (combining active flapping and gliding), a globe skimmer could cross the Indian Ocean, but the migration would have to occur where the ocean crossing is shortest, at an exceptionally fast gliding speed and with little headwind. Consequently, we deem this scenario unlikely and suggest that wind assistance is essential for the crossing. The wind trajectory analysis reveals intra- and inter-seasonal differences in availability of favorable tailwinds, with only 15.2% of simulated migration trajectories successfully reaching land in autumn but 40.9% in spring, taking on average 127 and 55 h respectively. Thus, there is a pronounced requirement on dragonflies to be able to select favorable winds, especially in autumn. In conclusion, a multi-generational, migratory circuit of the Indian Ocean by the globe skimmer is shown to be achievable, provided that advanced adaptations in physiological endurance, behavior and wind selection ability are present. Given that migration over the Indian Ocean would be heavily dependent on the assistance of favorable winds, occurring during a relatively narrow time window, the proposed flyway is potentially susceptible to disruption, if wind system patterns were to be affected by climatic change.
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Clerc J, Rogers EJ, McGuire LP. Testing Predictions of Optimal Migration Theory in Migratory Bats. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.686379] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Optimal migration theory is a framework used to evaluate trade-offs associated with migratory strategies. Two strategies frequently considered by migration theory are time minimizing, whereby migration is completed as quickly as possible, and energy minimizing, whereby migration is completed as energetically efficiently as possible. Despite extensive literature dedicated to generating analytical predictions about these migratory strategies, identifying appropriate study systems to empirically test predictions is difficult. Theoretical predictions that compare migratory strategies are qualitative, and empirical tests require that both time-minimizers and energy-minimizers are present in the same population; spring migrating silver-haired (Lasionycteris noctivagans) and hoary bats (Lasiurus cinereus) provide such a system. As both species mate in the fall, spring-migrating males are thought to be energy-minimizers while females benefit from early arrival to summering grounds, and are thought to be time-minimizers. Thermoregulatory expression also varies between species during spring migration, as female silver-haired bats and males of both species use torpor while female hoary bats, which implant embryos earlier, are thought to avoid torpor use which would delay pregnancy. Based on optimal migration theory, we predicted that female silver-haired bats and hoary bats would have increased fuel loads relative to males and the difference between fuel loads of male and female hoary bats would be greater than the difference between male and female silver-haired bats. We also predicted that females of both species would have a greater stopover foraging proclivity and/or assimilate nutrients at a greater rate than males. We then empirically tested our predictions using quantitative magnetic resonance to measure fuel load, δ13C isotope breath signature analysis to assess foraging, and 13C–labeled glycine to provide an indicator of nutrient assimilation rate. Optimal migration theory predictions of fuel load were supported, but field observations did not support the predicted refueling mechanisms, and alternatively suggested a reliance on increased fuel loads via carry-over effects. This research is the first to validate a migration theory prediction in a system of both time and energy minimizers and uses novel methodological approaches to uncover underlying mechanisms of migratory stopover use.
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Piccioli Cappelli M, Blakey RV, Taylor D, Flanders J, Badeen T, Butts S, Frick WF, Rebelo H. Limited refugia and high velocity range-shifts predicted for bat communities in drought-risk areas of the Northern Hemisphere. Glob Ecol Conserv 2021. [DOI: 10.1016/j.gecco.2021.e01608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Thongjued K, Chotigeat W, Bumrungsri S, Thanakiatkrai P, Kitpipit T. Direct PCR-DGGE Technique Reveals Wrinkle-Lipped Free-Tailed Bat (Chaerephon plicatus Buchanan, 1800) Predominantly Consume Planthoppers and Mosquitoes in Central Thailand. ACTA CHIROPTEROLOGICA 2021. [DOI: 10.3161/15081109acc2021.23.1.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Kantima Thongjued
- Prince of Songkla University, 15 Karnchanawanich Road, Hat Yai, Songkhla, Thailand 90112
| | - Wilaiwan Chotigeat
- Prince of Songkla University, 15 Karnchanawanich Road, Hat Yai, Songkhla, Thailand 90112
| | - Sara Bumrungsri
- Prince of Songkla University, 15 Karnchanawanich Road, Hat Yai, Songkhla, Thailand 90112
| | - Phuvadol Thanakiatkrai
- Prince of Songkla University, 15 Karnchanawanich Road, Hat Yai, Songkhla, Thailand 90112
| | - Thitika Kitpipit
- Prince of Songkla University, 15 Karnchanawanich Road, Hat Yai, Songkhla, Thailand 90112
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Autumn southward migration of dragonflies along the Baltic coast and the influence of weather on flight behaviour. Anim Behav 2021. [DOI: 10.1016/j.anbehav.2021.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Haest B, Stepanian PM, Wainwright CE, Liechti F, Bauer S. Climatic drivers of (changes in) bat migration phenology at Bracken Cave (USA). GLOBAL CHANGE BIOLOGY 2021; 27:768-780. [PMID: 33151018 DOI: 10.1111/gcb.15433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 10/28/2020] [Indexed: 06/11/2023]
Abstract
Climate change is drastically changing the timing of biological events across the globe. Changes in the phenology of seasonal migrations between the breeding and wintering grounds have been observed across biological taxa, including birds, mammals, and insects. For birds, strong links have been shown between changes in migration phenology and changes in weather conditions at the wintering, stopover, and breeding areas. For other animal taxa, the current understanding of, and evidence for, climate (change) influences on migration still remains rather limited, mainly due to the lack of long-term phenology datasets. Bracken Cave in Texas (USA) holds one of the largest bat colonies of the world. Using weather radar data, a unique 23-year (1995-2017) long time series was recently produced of the spring and autumn migration phenology of Brazilian free-tailed bats (Tadarida brasiliensis) at Bracken Cave. Here, we analyse these migration phenology time series in combination with gridded temperature, precipitation, and wind data across Mexico and southern USA, to identify the climatic drivers of (changes in) bat migration phenology. Perhaps surprisingly, our extensive spatiotemporal search did not find temperature to influence either spring or autumn migration. Instead, spring migration phenology seems to be predominantly driven by wind conditions at likely wintering or spring stopover areas during the migration period. Autumn migration phenology, on the other hand, seems to be dominated by precipitation to the east and north-east of Bracken Cave. Long-term changes towards more frequent migration and favourable wind conditions have, furthermore, allowed spring migration to occur 16 days earlier. Our results illustrate how some of the remaining knowledge gaps on the influence of climate (change) on bat migration and abundance can be addressed using weather radar analyses.
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Affiliation(s)
- Birgen Haest
- Swiss Ornithological Institute, Sempach, Switzerland
| | - Phillip M Stepanian
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Charlotte E Wainwright
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, IN, USA
| | - Felix Liechti
- Swiss Ornithological Institute, Sempach, Switzerland
| | - Silke Bauer
- Swiss Ornithological Institute, Sempach, Switzerland
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14
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Gao B, Hedlund J, Reynolds DR, Zhai B, Hu G, Chapman JW. The 'migratory connectivity' concept, and its applicability to insect migrants. MOVEMENT ECOLOGY 2020; 8:48. [PMID: 33292576 PMCID: PMC7718659 DOI: 10.1186/s40462-020-00235-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 11/25/2020] [Indexed: 05/06/2023]
Abstract
Migratory connectivity describes the degree of linkage between different parts of an animal's migratory range due to the movement trajectories of individuals. High connectivity occurs when individuals from one particular part of the migratory range move almost exclusively to another localized part of the migratory range with little mixing with individuals from other regions. Conversely, low migratory connectivity describes the situation where individuals spread over a wide area during migration and experience a large degree of mixing with individuals from elsewhere. The migratory connectivity concept is frequently applied to vertebrate migrants (especially birds), and it is highly relevant to conservation and management of populations. However, it is rarely employed in the insect migration literature, largely because much less is known about the migration circuits of most migratory insects than is known about birds. In this review, we discuss the applicability of the migratory connectivity concept to long-range insect migrations. In contrast to birds, insect migration circuits typically comprise multigenerational movements of geographically unstructured (non-discrete) populations between broad latitudinal zones. Also, compared to the faster-flying birds, the lower degree of control over movement directions would also tend to reduce connectivity in many insect migrants. Nonetheless, after taking account of these differences, we argue that the migratory connectivity framework can still be applied to insects, and we go on to consider postulated levels of connectivity in some of the most intensively studied insect migrants. We conclude that a greater understanding of insect migratory connectivity would be of value for conserving threatened species and managing pests.
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Affiliation(s)
- Boya Gao
- Department of Entomology, Nanjing Agricultural University, Nanjing, China.
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, UK.
| | - Johanna Hedlund
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, UK
- Lund University, Department of Biology, Centre for Animal Movement Research, Ecology Building, SE-223 62, Lund, Sweden
| | - Don R Reynolds
- Natural Resources Institute, University of Greenwich, Chatham, Kent, UK
- Rothamsted Research, Harpenden, Hertfordshire, UK
| | - Baoping Zhai
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Gao Hu
- Department of Entomology, Nanjing Agricultural University, Nanjing, China
| | - Jason W Chapman
- Department of Entomology, Nanjing Agricultural University, Nanjing, China.
- Centre for Ecology and Conservation, University of Exeter, Penryn, Cornwall, UK.
- Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, UK.
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15
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Ibáñez C, Fukui D, Popa‐Lisseanu A.G, Pastor‐Beviá D, García‐Mudarra JL, Juste J. Molecular identification of bird species in the diet of the bird‐like noctule bat in Japan. J Zool (1987) 2020. [DOI: 10.1111/jzo.12855] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. Ibáñez
- Estación Biológica de Doñana (CSIC) Sevilla Spain
| | - D. Fukui
- Graduate School of Agricultural and Life Sciences The University of Tokyo Hokkaido Forest The University of Tokyo Furano Hokkaido Japan
| | | | | | | | - J. Juste
- Estación Biológica de Doñana (CSIC) Sevilla Spain
- CIBER Epidemiology and Public Health (CIBERESP) Madrid Spain
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16
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Menz MHM, Reynolds DR, Gao B, Hu G, Chapman JW, Wotton KR. Mechanisms and Consequences of Partial Migration in Insects. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00403] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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17
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Abstract
The crepuscular (evening) circadian rhythm of adult spruce budworm (Choristoneura fumiferana (Clem.)) flight activity under the influence of changing evening temperatures is described using a mathematical model. This description is intended for inclusion in a comprehensive model of spruce budworm flight activity leading to the simulation of mass migration events. The model for the temporal likelihood of moth emigration flight is calibrated using numerous observations of flight activity in the moth’s natural environment. Results indicate an accurate description of moth evening flight activity using a temporal function covering the period around sunset and modified by evening temperature conditions. The moth’s crepuscular flight activity is typically coincident with the evening transition of the atmospheric boundary layer from turbulent daytime to stable nocturnal conditions. The possible interactions between moth flight activity and the evening boundary layer transition, with favorable wind and temperature conditions leading to massive and potentially successful migration events, as well as the potential impact of climate change on this process, are discussed.
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18
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Rogers EJ, Sommers AS, McGuire LP. Seasonal Dynamics of Lipid Metabolism and Energy Storage in the Brazilian Free-Tailed Bat. Physiol Biochem Zool 2019; 92:386-395. [DOI: 10.1086/704107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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19
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Jones CM, Parry H, Tay WT, Reynolds DR, Chapman JW. Movement Ecology of Pest Helicoverpa: Implications for Ongoing Spread. ANNUAL REVIEW OF ENTOMOLOGY 2019; 64:277-295. [PMID: 30296859 DOI: 10.1146/annurev-ento-011118-111959] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The recent introduction and spread of Helicoverpa armigera throughout South America highlight the invasiveness and adaptability of moths in the Helicoverpa genus. Long-range movement in three key members, H. armigera, H. zea, and H. punctigera, occurs by migration and international trade. These movements facilitate high population admixture and genetic diversity, with important economic, biosecurity, and control implications in today's agricultural landscape. This is particularly true for the spread of resistance alleles to transgenic crops expressing Bacillus thuringiensis (Bt) toxins that are planted over vast areas to suppress Helicoverpa spp. The ability to track long-distance movement through radar technology, population genetic markers, and/or long-distance dispersal modeling has advanced in recent years, yet we still know relatively little about the population trajectories or migratory routes in Helicoverpa spp. Here, we consider how experimental and theoretical approaches can be integrated to fill key knowledge gaps and assist management practices.
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Affiliation(s)
- Christopher M Jones
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool L3 5QA, United Kingdom;
- Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, United Kingdom
| | - Hazel Parry
- Ecosciences Precinct, CSIRO, Brisbane, Queensland 4102, Australia;
| | - Wee Tek Tay
- Black Mountain Laboratories, CSIRO, Canberra, Australian Capital Territory 2601, Australia;
| | - Don R Reynolds
- Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, United Kingdom
- Natural Resources Institute, University of Greenwich, Chatham ME4 4TB, United Kingdom;
| | - Jason W Chapman
- Centre for Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, Penryn TR10 9FE, United Kingdom;
- College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
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20
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Stepanian PM, Wainwright CE. Ongoing changes in migration phenology and winter residency at Bracken Bat Cave. GLOBAL CHANGE BIOLOGY 2018; 24:3266-3275. [PMID: 29442413 DOI: 10.1111/gcb.14051] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 01/04/2018] [Indexed: 06/08/2023]
Abstract
Bats play an important role in agroecology and are effective bioindicators of environmental conditions, but little is known about their fundamental migration ecology, much less how these systems are responding to global change. Some of the world's largest bat populations occur during the summer in the south-central United States, when millions of pregnant females migrate from lower latitudes to give birth in communal maternity colonies. Despite a relatively large volume of research into these colonies, many fundamental questions regarding their abundance-including their intra- and interseasonal variability-remain unanswered, and even estimating the size of individual populations has been a long-running challenge. Overall, monitoring these bat populations at high temporal resolution (e.g., nightly) and across long time spans (e.g., decades) has been impossible. Here, we show 22 continuous years of nightly population counts at Bracken Cave, a large bat colony in south-central Texas, enabling the first climate-scale phenological analysis. Using quantitative radar monitoring, we found that spring migration and the summer reproductive cycle have advanced by approximately 2 weeks over the study period. Furthermore, we quantify the ongoing growth of a newly-established overwintering population that indicates a system-wide response to changing environmental conditions. Our observations reveal behavioral plasticity in bats' ability to adapt to changing resource availability, and provide the first long-term quantification of their response to a changing climate. As aerial insectivores, these changes in bat phenology and propensity for overwintering indicate probable shifts in prey availability, with clear implications for pest management across wider regional agrisystems.
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Affiliation(s)
- Phillip M Stepanian
- Computational and Analytical Sciences Department, Rothamsted Research, Harpenden, UK
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21
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Srilopan S, Bumrungsri S, Jantarit S. The Wrinkle-Lipped Free-Tailed Bat (Chaerephon plicatus Buchannan, 1800) Feeds Mainly on Brown Planthoppers in Rice Fields of Central Thailand. ACTA CHIROPTEROLOGICA 2018. [DOI: 10.3161/15081109acc2018.20.1.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Supawan Srilopan
- Department of Biology, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Sara Bumrungsri
- Department of Biology, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Sopark Jantarit
- Department of Biology, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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22
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Krauel J, Ratcliffe J, Westbrook J, McCracken G. Brazilian free-tailed bats (Tadarida brasiliensis) adjust foraging behaviour in response to migratory moths. CAN J ZOOL 2018. [DOI: 10.1139/cjz-2017-0284] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Insect migrations represent large movements of resources across a landscape, which are attractive to predators capable of detecting and catching them. Brazilian free-tailed bats (Tadarida brasiliensis (I. Geoffroy, 1824)) consume migratory noctuid moths, which concentrate in favourable winds resulting in aggregations of prey that attract bats hundreds of metres above ground. Although T. brasiliensis are known to feed on these aggregations of migratory moths, changes in their foraging behaviours have not been linked to moth migration events. We investigated possible shifts in the bats’ foraging behaviours when moths are migrating with respect to altitude and moth abundance. We recorded 1104 echolocation call passes of T. brasiliensis at ground level and at altitudes of ∼100 and ∼200 m above ground level. We found proportionally more bat activity at higher altitudes when migratory moth abundance was high. We also found that bats decreased call frequency and bandwidth and increased call duration at higher altitudes and behaved similarly with increasing moth abundance even at ground level. Our results support predictions that bats change foraging behaviour in response to seasonal availability of migratory moths and document alterations in echolocation call parameters that are consistent with optimizing prey detection.
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Affiliation(s)
- J.J. Krauel
- Department of Ecology and Evolutionary Biology, University of Tennessee, 569 Dabney Hall, Knoxville, TN 37996, USA
| | - J.M. Ratcliffe
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - J.K. Westbrook
- USDA Agricultural Research Service, 2771 F and B Road, College Station, TX 77845, USA
| | - G.F. McCracken
- Department of Ecology and Evolutionary Biology, University of Tennessee, 569 Dabney Hall, Knoxville, TN 37996, USA
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23
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Gibb R, Shoji A, Fayet AL, Perrins CM, Guilford T, Freeman R. Remotely sensed wind speed predicts soaring behaviour in a wide-ranging pelagic seabird. J R Soc Interface 2018; 14:rsif.2017.0262. [PMID: 28701505 DOI: 10.1098/rsif.2017.0262] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 06/13/2017] [Indexed: 11/12/2022] Open
Abstract
Global wind patterns affect flight strategies in many birds, including pelagic seabirds, many of which use wind-powered soaring to reduce energy costs during at-sea foraging trips and migration. Such long-distance movement patterns are underpinned by local interactions between wind conditions and flight behaviour, but these fine-scale relationships are far less well understood. Here we show that remotely sensed ocean wind speed and direction are highly significant predictors of soaring behaviour in a migratory pelagic seabird, the Manx shearwater (Puffinus puffinus). We used high-frequency GPS tracking data (10 Hz) and statistical behaviour state classification to identify two energetic modes in at-sea flight, corresponding to flap-like and soar-like flight. We show that soaring is significantly more likely to occur in tailwinds and crosswinds above a wind speed threshold of around 8 m s-1, suggesting that these conditions enable birds to reduce metabolic costs by preferentially soaring over flapping. Our results suggest a behavioural mechanism by which wind conditions may shape foraging and migration ecology in pelagic seabirds, and thus indicate that shifts in wind patterns driven by climate change could impact this and other species. They also emphasize the emerging potential of high-frequency GPS biologgers to provide detailed quantitative insights into fine-scale flight behaviour in free-living animals.
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Affiliation(s)
- Rory Gibb
- Institute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY, UK .,Centre for Biodiversity and Environment Research, Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK
| | - Akiko Shoji
- Oxford Navigation Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Annette L Fayet
- Oxford Navigation Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Chris M Perrins
- Edward Grey Institute, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Tim Guilford
- Oxford Navigation Group, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Robin Freeman
- Institute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY, UK
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24
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McCracken GF, Bernard RF, Gamba-Rios M, Wolfe R, Krauel JJ, Jones DN, Russell AL, Brown VA. Rapid range expansion of the Brazilian free-tailed bat in the southeastern United States, 2008–2016. J Mammal 2018. [DOI: 10.1093/jmammal/gyx188] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Gary F McCracken
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
| | - Riley F Bernard
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Department of Ecosystem Science and Management, Pennsylvania State University, University Park, PA, USA
| | - Melquisidec Gamba-Rios
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Department of Ecosystem Science and Management, Pennsylvania State University, University Park, PA, USA
| | - Randy Wolfe
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Varmint Busters Wildlife Management Services, Knoxville, TN, USA
| | - Jennifer J Krauel
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
| | - Devin N Jones
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
| | - Amy L Russell
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Department of Biology, Grand Valley State University, Allendale, MI, USA
| | - Veronica A Brown
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
- Department of Biology, Grand Valley State University, Allendale, MI, USA
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25
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Predator–prey interaction reveals local effects of high-altitude insect migration. Oecologia 2017; 186:49-58. [DOI: 10.1007/s00442-017-3995-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Accepted: 10/26/2017] [Indexed: 01/05/2023]
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26
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Bauer S, Chapman JW, Reynolds DR, Alves JA, Dokter AM, Menz MMH, Sapir N, Ciach M, Pettersson LB, Kelly JF, Leijnse H, Shamoun-Baranes J. From Agricultural Benefits to Aviation Safety: Realizing the Potential of Continent-Wide Radar Networks. Bioscience 2017; 67:912-918. [PMID: 29599538 PMCID: PMC5862237 DOI: 10.1093/biosci/bix074] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Migratory animals provide a multitude of services and disservices—with benefits or costs in the order of billions of dollars annually. Monitoring, quantifying, and forecasting migrations across continents could assist diverse stakeholders in utilizing migrant services, reducing disservices, or mitigating human–wildlife conflicts. Radars are powerful tools for such monitoring as they can assess directional intensities, such as migration traffic rates, and biomass transported. Currently, however, most radar applications are local or small scale and therefore substantially limited in their ability to address large-scale phenomena. As weather radars are organized into continent-wide networks and also detect “biological targets,” they could routinely monitor aerial migrations over the relevant spatial scales and over the timescales required for detecting responses to environmental perturbations. To tap these unexploited resources, a concerted effort is needed among diverse fields of expertise and among stakeholders to recognize the value of the existing infrastructure and data beyond weather forecasting.
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Affiliation(s)
- Silke Bauer
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Jason W Chapman
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Don R Reynolds
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - José A Alves
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Adriaan M Dokter
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Myles M H Menz
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Nir Sapir
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Michał Ciach
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Lars B Pettersson
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Jeffrey F Kelly
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Hidde Leijnse
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
| | - Judy Shamoun-Baranes
- Silke Bauer is affiliated with the Swiss Ornithological Institute, in Sempach, Switzerland. Jason W. Chapman is affiliated with the Centre for Ecology and Conservation and with the Environment and Sustainability Institute at the University of Exeter, in Penryn, Cornwall, United Kingdom. Don R. Reynolds is with the Natural Resources Institute at the University of Greenwich, in Chatham, United Kingdom. José A. Alves is affiliated with CESAM at the University of Aveiro, Campus de Santiago, in Portugal, and with the South Iceland Research Centre at the University of Iceland, in Selfoss. Adriaan M. Dokter and Judy Shamoun-Baranes are affiliated with the Institute for Biodiversity and Ecosystem Dynamics at the University of Amsterdam, in The Netherlands. AMD is also affiliated with the Lab of Ornithology at Cornell University, in Ithaca, New York. Myles M. H. Menz is affiliated with the Institute of Ecology and Evolution at the University of Bern, in Switzerland, and with the School of Biological Sciences at the University of Western Australia, in Crawley. Nir Sapir is with the Department of Evolutionary and Environmental Biology at the University of Haifa, in Israel. Michał Ciach is affiliated with the Department of Forest Biodiversity at the University of Agriculture, in Krakow, Poland. Lars B. Pettersson is with the Biodiversity Unit, Department of Biology, at the University of Lund, in Sweden. Jeffrey F. Kelly is affiliated with the Oklahoma Biological Survey and the Department of Biology at the University of Oklahoma, in Norman. Hidde Leijnse is with the Royal Netherlands Meteorological Institute, in De Bilt, The Netherlands
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Farnsworth A, Van DOREN BM, Hochachka WM, Sheldon D, Winner K, Irvine J, Geevarghese J, Kelling S. A characterization of autumn nocturnal migration detected by weather surveillance radars in the northeastern USA. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2016; 26:752-770. [PMID: 27411248 DOI: 10.1890/15-0023] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Billions of birds migrate at night over North America each year. However, few studies have described the phenology of these movements, such as magnitudes, directions, and speeds, for more than one migration season and at regional scales. In this study, we characterize density, direction, and speed of nocturnally migrating birds using data from 13 weather surveillance radars in the autumns of 2010 and 2011 in the northeastern USA. After screening radar data to remove precipitation, we applied a recently developed algorithm for characterizing velocity profiles with previously developed methods to document bird migration. Many hourly radar scans contained windborne "contamination," and these scans also exhibited generally low overall reflectivities. Hourly scans dominated by birds showed nightly and seasonal patterns that differed markedly from those of low reflectivity scans. Bird migration occurred during many nights, but a smaller number of nights with large movements of birds defined regional nocturnal migration. Densities varied by date, time, and location but peaked in the second and third deciles of night during the autumn period when the most birds were migrating. Migration track (the direction to which birds moved) shifted within nights from south-southwesterly to southwesterly during the seasonal migration peaks; this shift was not consistent with a similar shift in wind direction. Migration speeds varied within nights, although not closely with wind speed. Airspeeds increased during the night; groundspeeds were highest between the second and third deciles of night, when the greatest density of birds was migrating. Airspeeds and groundspeeds increased during the fall season, although groundspeeds fluctuated considerably with prevailing winds. Significant positive correlations characterized relationships among bird densities at southern coastal radar stations and northern inland radar stations. The quantitative descriptions of broadscale nocturnal migration patterns presented here will be essential for biological and conservation applications. These descriptions help to define migration phenology in time and space, fill knowledge gaps in avian annual cycles, and are useful for monitoring long-term population trends of migrants. Furthermore, these descriptions will aid in assessing potential risks to migrants, particularly from structures with which birds collide and artificial lighting that disorients migrants.
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