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Arthropod Surveys on Palmyra Atoll, Line Islands, and Insights into the Decline of the Native Tree Pisonia grandis (Nyctaginaceae).

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Title: Arthropod Surveys on Palmyra Atoll, Line Islands, and Insights into the Decline of the Native Tree Pisonia grandis (Nyctaginaceae).
Authors: Handler, Alex T.
Gruner, Daniel S.
Haines, William P.
Lange, Matthew W.
Kaneshiro, Kenneth Y.
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.
Issue Date: Oct 2007
Publisher: Honolulu, University of Hawaii Press
Citation: Handler AT, Gruner DS, Haines WP, Lange MW, Kaneshiro KY. Arthropod Surveys on Palmyra Atoll, Line Islands, and Insights into the Decline of the Native Tree Pisonia grandis (Nyctaginaceae). Pac Sci 61(4): 485-502.
Series/Report no.: vol. 61, no. 4
Abstract: Palmyra Atoll, in the Line Islands of the equatorial Pacific, supports one of the largest remaining native stands of Pisonia grandis forest in the tropical Pacific Ocean. In 2003, we surveyed terrestrial arthropods to document extant native and introduced species richness, compare these lists with historical records, and assess potential threats to native species and ecosystem integrity. In total, 115 arthropod taxa were collected, bringing the total number of taxa recorded since 1913 to 162. Few native species were collected; most taxa were accidental introductions also recorded from the Hawaiian Islands, the presumed main source of introductions to Palmyra. The overlap with previous historical surveys in 1913 and 1948 was low (<40%), and new species continue to establish, with one species of whitefly reaching pest status between 2003 and 2005. We observed numerous dead or dying large Pisonia grandis, and the green scale Pulvinaria urbicola (Coccidae) was particularly abundant on trees of poor health. Abundant introduced ants, particularly Pheidole megacephala, tended this and other hemipterans feeding on both native and introduced plants. We hypothesize that the Pheidole-Pulvinaria facultative mutualism is causing the decline of Pisonia grandis. Because of the unique properties of Pisonia grandis forest on oceanic atolls, its importance for nesting seabirds, and its alarming global decline, immediate conservation efforts should be directed at controlling introducedHemiptera and disrupting their mutualisms with nonnative ants on Palmyra Atoll.
Description: v. ill. 23 cm.
Quarterly
Pages/Duration: 18 p.
URI/DOI: http://hdl.handle.net/10125/22631
ISSN: 0030-8870
Appears in Collections:Pacific Science, Volume 61, Number 4, 2007



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