Abstract
The hemipteran family Lygaeidae contains species that are overwhelmingly plant and seed feeders. The Wekiu bug, Nysius wekiuicola, a candidate endangered species endemic to the summit of the 4,205 m volcano, Mauna Kea, and the closely related A’A bug, Nysius aa, are the only obligate carnivore scavengers of the family. Despite its unique diet, remarkable ecology, and high profile due to conservation concerns, there is still little known about the Wekiu bug. We present the first detailed observations and descriptions of the Wekiu bug, including a complete life history. The Wekiu bug lays eggs singly or in small loose clutches, matures after five nymphal instars, and can survive and reproduce at constant temperatures never found in its natural habitat. Our results clearly demonstrate the importance of behaviour, rather than pure physiological adaption, in an insect’s persistence in a harsh environment. The Wekiu bug’s shift to carnivory from a suite of herbivorous congeners is a remarkable adaptive shift in an aeolian system bereft of vascular plants. Finally, we relate the specialized life history of the Wekiu bug to its conservation on the arid, frigid summit of the Mauna Kea volcano. This unique habitat is increasingly impacted by tourism and telescope facilities.
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References
Ashlock P, Gagné W (1983) A remarkable new micropterous Nysius species from the aeolian zone of Mauna Kea, Hawai’i Island (Hemiptera: Heteroptera: Lygaeidae). Int J Entomol 25(1):47–55
Birch L (1948) The intrinsic rate of natural increase of an insect population. J Anim Ecol 17:15–26
Brenner G (2002) Wekiu bug baseline monitoring. Quarterly report, 1st Quarter 2002. Tech Rep Prep W.M. Keck Observatory
Brenner G (2006) Wekiu bug baseline monitoring. Quarterly report, 2nd quarter 2006. Tech Rep Prep W.M. Keck Observatory
Crawford C (1981) Biology of desert invertebrates. Springer, New York
Duman J, Montgomery S (1991) Subzero temperature adaptations in arthropods from the summit of Mauna Kea, Hawaii. J Exp Zool 259(3):409–412
Englund R, Polhemus D, Howarth F, and Montgomery S (2002) Range, habitat, and ecology of the Wekiu bug (Nysius wekiuicola), a rare insect species unique to Mauna Kea, Hawaii. Isl Final Rep. Hawaii Biol Surv Contrib No. 2002-23
Federal Register (2005) Department of the Interior, Fish and Wildlife Service, 50 CFR 17. Endangered and threatened wildlife and plants. Review of species that are candidates or proposed for listing as endangered or threatened; annual notice of findings on resubmitted petition; annual description of progress on listing actions. Fed Regist 70 No. 90 (11 May 2005), pp 24870–24934
He X, Wang Q, Carpenter A (2004) Effect of day length on development and reproductive diapause in Nysius huttoni White (Heteroptera, Lygaeidae). J Appl Entomol 128(8):528–532
Howarth F (1987) Evolutionary ecology of aeolian and subterranean habitats in Hawaii. Trends Ecol Evol 2(7):220–223
Howarth F, Montgomery S (1980) Notes on the ecology of the high altitude Aeolian zone on Mauna Kea. Elepaio 41(3):21–22
Howarth F, Brenner G, and Preston D (1999) An arthropod assessment within 34 selected areas of the Mauna Kea Science Reserve. Prep Univ Hawaii Instit Astron 62 pp. Plus maps
Kay A (1994) A natural history of the Hawaiian Islands: selected readings II. University of Hawaii Press, Honolulu
Kehat M, Wyndham M (1972a) The effect of food and water on development, longevity, and fecundity in the Rutherglen Bug, Nysius vinitor (Hemiptera, Lygaeidae). Aust J Zool 20:119–130
Kehat M, Wyndham M (1972b) The influence of temperature on development, longevity, longevity, and fecundity in the Rutherglen bug, Nysius vinitor (Hemiptera: Lygaeidae). Aust J Zool 20:67–78
Krushelnycky P, Gillespie R (2008) Compositional and functional stability of arthropod communities in the face of ant invasions. Ecol Appl 18:1547–1562
Maschinski J (2006) Implications of population dynamic and metapopulation theory for restoration. In: Falk D, Palmer M, Zedler J (eds) Foundations restoration ecology. Island Press, Washington, DC
Polhemus D (1998) Nysius aa, a new species of micropterous wekiu bug from the summit of Mauna Loa volcano, Hawaii. Proc Entomol Soc Wash 100(1):25–31
Porter S, Englund R (2006) Possible geologic factors influencing the distribution on the Wēkiu Bug on Mauna Kea, Hawaii. Final Rep prep Office of Mauna Kea Manag, Hilo, Hawaii, 29 pp
Price J, Clague D (2002) How old is the Hawaiian biota? Geology and phylogeny suggest recent divergence. Proc Royal Soc London 269:2429–2435
TMT (July 21, 2009) Thirty meter telescope selects Mauna Kea. Press Release. Retrieved January 11, 2010 http://www.tmt.org/press_2009-07-21.html
Usinger R (1942) The Genus Nysius and its allies in the Hawaiian Islands (Hemiptera, Lygaeidae, Orsillini). Bull B P Bishop Mus 173: 1–167. 13 plates
Ziegler A (2002) Hawaiian natural history, ecology, and evolution. University of Hawaii Press, Honolulu
Acknowledgments
We gratefully acknowledge the logistical support of the Hawaii Department of Land and Natural Resources, permit numbers FHM07-135, FHM08-135, FHM09-181 (B. Gagné, C. King). We were funded by the Office of Mauna Kea Management (OMKM) (S. Nagata), the Mauna Kea Observatories, the Institute for Astronomy (R. McLaren), and the University of Hawaii at Manoa EECB (Evolution, Ecology, and Conservation Biology) program for research and travel grants (K. Kaneshiro—NSF #DGE05-38550). We also thank the Wekiu Bug Working Group for constant support and advice, and Ron Englund, Adam Vorsino, Dan Polhemus, Greg Brenner, Abigail Mason, Oska Lawrence, Celeste Yee, William Haines, Melissa Dean, and the many OMKM Rangers for assistance in the field and other research tasks.
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Eiben, J.A., Rubinoff, D. Life history and captive rearing of the Wekiu bug (Nysius wekiuicola, Lygaeidae), an alpine carnivore endemic to the Mauna Kea volcano of Hawaii. J Insect Conserv 14, 701–709 (2010). https://doi.org/10.1007/s10841-010-9298-y
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DOI: https://doi.org/10.1007/s10841-010-9298-y