New data on dragonflies (Odonata) of Mozambique, with a new country record of Phyllogomphus selysi Schouteden, 1933

Bernard, R; Bakowski, M.

doi:10.3897/afrinvertebr.61.48320

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Mozambique/Malawi Dijkstra [52] Nov and Jan Bernard et al [53] Dec/Mar-Apr Tanganyika BARTENEF [54] Dec-Jan Uganda BARTENEF [54] Mar-Apr,Oct India Fraser et al [1] Sep-Nov (Departure on 'annual migration') Amsterdam Island Devaud et al [55] Feb Chagos Archipalego…”

Section: Seychellesmentioning

confidence: 99%

Transoceanic migration of dragonflies and branched optimal route networks

Ranjan¹,

Pawar²,

Saha³

2022

Preprint

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The intriguing annual migration of the dragonfly species, Pantala flavescens was reported almost a century ago [1]. The multi-generational, transoceanic migration circuit spanning from India to Africa is an astonishing feat for an inches-long insect. Wind, precipitation, fuel, breeding, and life cycle affect the migration, yet understanding of their collective role in the migration remains elusive. We identify the transoceanic migration route by imposing a time constraint emerging from energetics on Djikstra's path-planning algorithm. Energetics calculations reveal a Pantala flavescens can endure 90 hours of steady flight at 4.5m/s. We incorporate active wind compensation in Djikstra's algorithm to compute the migration route from years 2002 to 2007. The prevailing winds play a pivotal role; a direct crossing of the Indian Ocean from Africa to India is feasible with the Somali Jet, whereas the return requires stopovers in Maldives and Seychelles. The migration timing, identified using monthly-successful trajectories, life cycle, and precipitation data, corroborates reported observations. Finally, our timely sighting in Cherrapunji, India (25.2N 91.7E) and a branched network hypothesis connect the likely origin of the migration in North-Eastern India with Pantala flavescens's arrival in South-Eastern India with the retreating monsoons; a clue to their extensive global dispersal.

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Section: Seychellesmentioning

confidence: 99%

Transoceanic migration of dragonflies and branched optimal route networks

Ranjan¹,

Pawar²,

Saha³

2022

Preprint

View full text Add to dashboard Cite

show abstract

Transoceanic migration network of dragonfly Pantala flavescens: origin, dispersal and timing

2023

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The awe-inspiring multi-generational, transoceanic migration circuit of dragonfly species, Pantala flavescens stretches from India to Africa. Understanding the collective role of wind, precipitation, fuel, breeding, and life cycle driving the migration remains elusive. We identify the transoceanic migration route from years 2002 to 2007 by imposing an energetics-based time-constraint on a modified Dijkstra’s path-planning algorithm incorporating active wind compensation. The prevailing winds play a pivotal role; the Somali Jet enables migration across the Indian Ocean from Africa to India, whereas the return requires stopovers at the disappearing islands of the Maldives and Seychelles. The migration timing, identified using monthly-successful trajectories, life cycle, and precipitation data, corroborates sightings. A branched-network hypothesis connects our sighting in Cherrapunji (North-East India), the likely origin, to the known migration circuit.

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New data on dragonflies (Odonata) of Mozambique, with a new country record of Phyllogomphus selysi Schouteden, 1933

Cited by 2 publications

References 10 publications

Transoceanic migration of dragonflies and branched optimal route networks

Transoceanic migration of dragonflies and branched optimal route networks

Transoceanic migration network of dragonfly Pantala flavescens: origin, dispersal and timing

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