Phratora polaris
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Family: Chrysomelidae
Genus: Phratora
Species:
P. polaris
Binomial name
Phratora polaris

Phratora polaris is a species of leaf beetle found in the Nordic regions of Europe.,[1][2][3] occasionally in Scotland,[4] and Iceland.[5] Some authors have recorded it in central Europe,[6] especially in the Alps.[7][8] Historically, this species has occurred in Greenland.[9] This beetle is found on willow (Salix) species in the southern part of its range.[1][10][11] Populations in Lapland feed on birch.[3][12][13]

Description

This small (3.7–5 mm) beetle is similar in size and shape to other species of Phratora. Willow-feeding adults are typically metallic blue or green, but birch feeding populations are metallic dark brown[14] Larvae are dark to black and pupae are pale.[15]

Distribution and range

Phratora polaris occurs in the Nordic regions of Europe,[1][14] occasionally in Scotland,[4][15] and Iceland.[5] It has also been recorded in the eastern Alps.[7][8] and in Germany.[6]

Habitat and host plants

Phratora polaris is the only Phratora species known to feed on host plants in two different plant families (Salicaceae) and (Betulaceae).[11] In most of its range, P. polaris adults and larvae feed and lay eggs on willow (Salix) plants. In Iceland,[5] Norway[16] and Scotland,[17] populations are found on the low-growing Salix herbacea. In Norway[16] and Finland,[10] populations occur on the tea-leaved willow (Salix phylicifolia) and on Salix polaris.[1] In Alpine Austria, it has been recorded on Salix arbuscula.[7] In Finnish Lapland[12][18] and Swedish Lapland,[3] P. polaris is known to feed on Betula pubescens.[13]

Taxonomy

Genitalia of female Phratora polaris from Finland
Genitalia of female Phratora polaris from Finland

Phratora polaris is closely related to Phratora tibialis, as noted by Palmen,[1] Steinhausen,[8] Sundholm,[19] and Köpf et al. (1996).[10] Male[1] and female genitalia of P. polaris (which can be observed with live beetles under the dissecting scope when pressure is applied to the abdomen), closely resemble those of P. tibialis.[19] Steinhausen (1993)[8] described populations in Austria as belonging to a 'boreal-alpine' form of P. polaris.

Mitochondrial sequences at the mitochondrial cytochrome c oxidase subunit I (DNA barcoding) gene show more divergence among willow- vs birch-feeding populations of P. polaris within Finland than between willow-feeding populations of P. polaris from Finland and P. tibialis from Switzerland.[11] In 1996, Köpf et al.[10] examined host plant preferences and mating behaviors for P. tibialis populations from Switzerland and a P. polaris population in eastern Finland. Beetles from all three populations showed similar host plant preferences, regardless of the host plant that they had been collected on, and P. tibialis and P. polaris individuals also mated with each other freely. These behavioral studies suggest that the actual biological species boundaries may be different than current classifications suggest. For example, birch-feeding populations of P. polaris might be classified as different species.[11]

Life history and natural enemies

Like other Phratora species at high altitudes and latitudes, P. polaris probably undergoes one generation within a growing season.[10][11] It probably shares the same natural enemies as other Phratora species, which are described in more detail for Phratora vitellinae and Phratora laticollis.

Larval secretion chemistry

Phratora polaris larvae secrete a defensive secretion that contains iridoid monoterpenes that they synthesize themselves (autogeneously), while their congener Phratora vitellinae sequesters host plant salicylates to make its larval defensive secretion.[20] Using host plant compounds to make the larval defensive secretions appears to be the evolutionarily advanced or derived state of this trait.[11] Studies of the effect of these defensive secretions on potential generalist spider predators revealed that the spiders ate larvae of P. polaris more readily than P. vitellinae, which was probably because the defensive secretion of Phratora vitellinae was more repellent to the spiders than the secretion of P. polaris.[21]

References

  1. 1 2 3 4 5 6 Palmén, E. (1945). "Zur Systematik finnischer Chrysomeliden. 2. Taxonomisches und Zoographisches über Phyllodecta polaris Sp.-Schn". Annales Entomologici Fennici. 3: 196–203.
  2. ↑ Silverberg, H. (1994). "Chrysomelidae in the Arctic". In Jolivet, P. H.; Cox, M. L.; Petitpierre, E. (eds.). Novel aspects of the biology of Chrysomelidae. Vol. 50. Dordrecht: Kluwer Academic. pp. 503–510.
  3. 1 2 3 Tenow, O. (1963). "Leaf-eating insects on the mountain birch at Abisko (Swedish Lapland) with notes on bionomics and parasites". Zoologiska Bidrag från Uppsala. 35: 546–567.
  4. 1 2 "Phratora polaris Schneider, 1886". UK Beetle Recording. Retrieved 2021-08-08.
  5. 1 2 3 "Phratora polaris". voktun-natturuverndarsvaeda. Retrieved 2021-08-08.
  6. 1 2 Lucht, W. H. (1987). Die Käfer Mitteleuropas: Katalog. Krefeld: Goecke and Evers Verlag.
  7. 1 2 3 Franz, H. (1974). Die nordost-Alpen im Spiegel ihrer Landtierwelt: eine Gebietsmonographie. Coleoptera 2. Teil, umfassend die Familien Pselaphidae bis Scolytidae. Umfassend: Fauna, Faunengeschichte, Lebensgemeinschaften und Beeinflussung der Tiere durch den Menschen. Vol. 4. Innsbruck-München: Universitätsverlag Wagner.
  8. 1 2 3 4 Steinhausen, W. R. (1993). "Phratora polaris leederi, eine boreoalpine Rasse in Mitteleuropa (Coleoptera Chrysomelidae)". Acta Coleopterologica. 9: 29.
  9. ↑ Bennike, Ole; Björck, Svante; Böcher, Jens; Hansen, Louise; Heinemeier, Jan; Wohlfarth, Barbara (1999). "Early Holocene plant and animal remains from North‐east Greenland". Journal of Biogeography. 26 (3): 667–677. doi:10.1046/j.1365-2699.1999.t01-1-00315.x. ISSN 0305-0270. S2CID 55656729.
  10. 1 2 3 4 5 Köpf, A.; Rank, N.; Roininen, H. (1996). "Geographic variation in feeding and mating preferences in the Phratora tibialis complex". Entomologia Experimentalis et Applicata. 80: 311–314. doi:10.1111/j.1570-7458.1996.tb00942.x. S2CID 84826240.
  11. 1 2 3 4 5 6 Köpf, A.; Rank, N. E.; Roininen, H.; Julkunen-Tiitto, R.; Pasteels, J. M.; Tahvanainen, J. (1998). "The evolution of host-plant use and sequestration in the leaf beetle genus Phratora (Coleoptera: Chrysomelidae)". Evolution. 52 (2): 517–528. doi:10.1111/j.1558-5646.1998.tb01651.x. PMID 28568343. S2CID 24641299.
  12. 1 2 Koponen, S. (1973). "Herbivorous invertebrates of the mountain birch at Kevo, Finnish Lapland". Reports of the Kevo Subarctic Research Station. 10: 20–28.
  13. 1 2 Holmstrom, A. (1972). "The invertebrate fauna of the Kilpisjärvi area, Finnish Lapland". Acta Societatis Pro Fauna et Flora Fennica. 80: 165–180.
  14. 1 2 "Phratora polaris (Sparre Schneider, 1886)". Polarmessingbladbille Phratora polaris (Sparre Schneider, 1886). Retrieved 2021-08-10.
  15. 1 2 Owen, J. A. (1988). "A note on the life history of Phyllodecta polaris Schneider (Col.: Chrysomelidae)". Entomologist's Record and Journal of Variation. 100 (3): 91–92. ISSN 0013-8916.
  16. 1 2 Munster, T. (1935). "Norwegian Chrysomelids". Norsk Entomolgisk Tidsskrift. 4: 1–8.
  17. ↑ Morris, M. G. (1970). "Phyllodecta polaris Schneider (Col., Chrysomelidae) new to the British isles from Wester Ross and Inverness-Shire, Scotland". Entomologist's Monthly Magazine. 106: 48–53.
  18. ↑ Nuorteva, P. (1966). "Leaf development and leaf pathogens on subarctic birches after a calamity of Oporinia autumnata (Bkh.) (Lep., Geometridae)". Annales Zoologici Fennici. 3: 270–286.
  19. 1 2 Sundholm, A. (1956). "Studien über die Gattung Phyllodecta Kirby (Col. Chrysomelidae)". Opuscula Entomologica. 21: 5–7.
  20. ↑ Pasteels, J. M.; Rowell-Rahier, M.; Braekman, J. C.; Daloze, D. (1984). "Chemical defenses in leaf beetles and their larvae: their ecological, evolutionary and taxonomic significance" (PDF). Biochemical Systematics and Ecology. 12 (4): 395–406. doi:10.1016/0305-1978(84)90071-1. S2CID 83537954.
  21. ↑ Palokangas, P.; Neuvonen, S. (1992). "Differences between species and instars of Phratora leaf beetles (Coleoptera, Chrysomelidae) in the probability to be preyed on". Annales Zoologici Fennici. 29: 273–278.
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