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Demography of Cycas micronesica on Guam following introduction of the armoured scale Aulacaspis yasumatsui

Published online by Cambridge University Press:  12 April 2012

Thomas E. Marler  and
John H. Lawrence
Thomas E. Marler*
Affiliation:
Western Pacific Tropical Research Center, CNAS, University of Guam, UOG Station, Mangilao, Guam 96923, USA
John H. Lawrence
Affiliation:
United States Department of Agriculture, Natural Resources Conservation Service, Mongmong, Guam, 96910, USA
*
1Corresponding author. Email: tmarler@uguam.uog.edu
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Abstract:

Following the 2003 invasion of the armoured scale Aulacaspis yasumatsui to Guam, changes to population traits of the dominant Cycas micronesica were determined. Belt transects with a width of 4 m and an average length of 120 m were established in October 2004 to document plant mortality until January 2011. Stem height, basal diameter and leaf number were also measured for each plant and used to determine density, demography and allometric relationships. Allometric traits and a left-skewed demographic structure of the pre-invasion C. micronesica habitat documented a thriving population with high recruitment potential. Aulacaspis yasumatsui dispersed into the study site 4 mo after the initial census. All seedlings were killed within 9 mo and all juvenile plants were killed within 40 ± 10 mo. Mortality reached 92% by 6 y after chronic scale infestations. Allometry and demography of the 2011 survivors described a collapsing C. micronesica population of stressed and reproductively challenged trees with no recruitment. This classic example of the enemy release hypothesis has resulted in a homogeneous decline in plant density from 2007–2011. The trend predicts extirpation of C. micronesica from west Guam habitats by 2019.

Keywords

Cycadaceaeendangered speciesGuaminvasion ecologyoceanic islandspopulation dynamicssurvival
Type
Research Article
Information
Journal of Tropical Ecology , Volume 28 , Issue 3 , May 2012 , pp. 233 - 242
Copyright
Copyright © Cambridge University Press 2012

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References

LITERATURE CITED

BONGERS, F., POPMA, J., MEAVE, J. & CARABIAS, J. 1988. Structure and composition of the lowland rain forest of “Los Tuxtlas”, Mexico. Vegetatio 74:55–88.CrossRefGoogle Scholar
CIBRIÁN-JARAMILLO, A., DALY, A. C., BRENNER, E., DESALLE, R. & MARLER, T. E. 2010. When North and South don't mix: genetic connectivity of a recently endangered oceanic cycad, Cycas micronesica, in Guam using EST-microsatellites. Molecular Ecology 19:2364–2379.Google ScholarPubMed
DEEVEY, E. S. 1947. Life tables for natural populations of animals. Quarterly Review of Biology 22:283–314.CrossRefGoogle ScholarPubMed
DONALDSON, J. S. 2003. Status survey and conservation action plan IUCN/SSC. Cycad Specialist Group, IUCN, Gland. 86 pp.Google Scholar
DONNEGAN, J. A., BUTLER, S. L., GRABOWIECKI, W., HISEROTE, B. A. & LIMTIACO, D. 2004. Guam's forest resources, 2002. Resource Bulletin PNW-RB-243. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, Portland. 32 pp.CrossRefGoogle Scholar
ELTON, C. S. 1958. The ecology of invasions by animals and plants. Chapman Hall, London. 181 pp.CrossRefGoogle Scholar
GALIANO, L., MARTÍNEZ-VILALTA, J. & LLORET, F. 2011. Carbon reserves and canopy defoliation determine the recovery of Scots pine 4 yr after a drought episode. New Phytologist 190:750–759.CrossRefGoogle ScholarPubMed
GROENEVELD, R. A. & MEEDEN, G. 1984. Measuring skewness and kurtosis. The Statistician 33:391–399.CrossRefGoogle Scholar
GUARD, C., HAMNETT, M. P., NEUMANN, C. J., LANDER, M. A. & SIEGRIST, H. G. 1999. Typhoon vulnerability study for Guam. WERI Technical Report 85. University of Guam.Google Scholar
HEU, R. A., CHUN, M. & NAGAMINE, W. T. 1999. Sago palm scale. New Pest Advisory No. 99-01. Hawaii Dept. of Agriculture, Honolulu, Hawai'i.Google Scholar
HILL, K. D. 1994. The Cycas rumphii complex (Cycadaceae) in New Guinea and the Western Pacific. Australian Systematic Botany 7:543–567.CrossRefGoogle Scholar
HIRSH, H. & MARLER, T. 2002. Damage and recovery of Cycas micronesica after Typhoon Paka. Biotropica 34:598–602.CrossRefGoogle Scholar
HOFFMANN, M., HILTON-TAYLOR, C., ANGULO, A., BÖHM, M., BROOKS, T. M., BUTCHART, S. H. M., CARPENTER, K. E., CHANSON, J., COLLEN, B., COX, N. A., DARWALL, W. R. T., DULVY, N. K., HARRISON, L. R., KATARIYA, V., POLLOCK, C. M., QUADER, S., RICHMAN, N. I., RODRIGUES, A. S. L., TOGNELLI, M. F., VIÉ, J.-C., AGUIAR, J. M., ALLEN, D. J., ALLEN, G. R., AMORI, G., ANANJEVA, N. B., ANDREONE, F., ANDREW, P., ORTIZ, A. L. A., BAILLIE, J. E. M., BALDI, R., BELL, B. D., BIJU, S. D., BIRD, J. P., BLACK-DECIMA, P., BLANC, J. J., BOLAÑOS, F., BOLIVAR-G., W., BURFIELD, I. J., BURTON, J. A., CAPPER, D. R., CASTRO, F., CATULLO, G., CAVANAGH, R. D., CHANNING, A., CHAO, N. L., CHENERY, A. M., CHIOZZA, F., CLAUSNITZER, V., COLLAR, N. J., COLLETT, L. C., COLLETTE, B. B., FERNANDEZ, C. F. C., CRAIG, M. T., CROSBY, M. J., CUMBERLIDGE, N., CUTTELOD, A., DEROCHER, A. E., DIESMOS, A. C., DONALDSON, J. W., DUCKWORTH, J. W., DUTSON, G., DUTTA, S. K., EMSLIE, R. H., FARJON, A., FOWLER, S., FREYHOF, J., GARSHELIS, D. L., GERLACH, J., GOWER, D. J., GRANT, T. D., HAMMERSON, G. A., HARRIS, R. B., HEANEY, L. R., HEDGES, S. B., HERO, J.-M., HUGHES, B., HUSSAIN, S. A., ICOCHEA, M. J., INGER, R. F., ISHII, N., ISKANDAR, D. T., JENKINS, R. K. B., KANEKO, Y., KOTTELAT, M., KOVACS, K. M., KUZMIN, S. L., LA MARCA, E., LAMOREUX, J. F., LAU, M. W. N., LAVILLA, E. O., LEUS, K., LEWISON, R. L., LICHTENSTEIN, G., LIVINGSTONE, S. R., LUKOSCHEK, V., MALLON, D. P., MCGOWAN, P. J. K., MCIVOR, A., MOEHLMAN, P. D., MOLUR, S., ALONSO, A. M., MUSICK, J. A., NOWELL, K., NUSSBAUM, R. A., OLECH, W., ORLOV, N. L., PAPENFUSS, T. J., PARRA-OLEA, G., PERRIN, W. F., POLIDORO, B. A., POURKAZEMI, M., RACEY, P. A., RAGLE, J. S., RAM, M., RATHBUN, G., REYNOLDS, R. P., RHODIN, A. G. J., RICHARDS, S. J., RODRÍGUEZ, L. O., RON, S. R., RONDININI, C., RYLANDS, A. B., DE MITCHESON, Y. S., SANCIANGCO, J. C., SANDERS, K. L., SANTOS-BARRERA, G., SCHIPPER, J., SELF-SULLIVAN, C., SHI, Y., SHOEMAKER, A., SHORT, F. T., SILLERO-ZUBIRI, C., SILVANO, D. L., SMITH, K. G., SMITH, A. T., SNOEKS, J., STATTERSFIELD, A. J., SYMES, A. J., TABER, A. B., TALUKDAR, B. K., TEMPLE, H. J., TIMMINS, R., TOBIAS, J. A., TSYTSULINA, K., TWEDDLE, D., UBEDA, C., VALENTI, S. V., VAN DIJK, P. P., VEIGA, L. M., VELOSO, A., WEGE, D. C., WILKINSON, M., WILLIAMSON, W. A., XIE, F., YOUNG, G. E., AKÇAKAYA, H. R., BENNUN, L., BLACKBURN, T. M., BOITANI, L., DUBLIN, H. T., DA FONSECA, G. A. B., GASCON, C., LACHER, T. E., MACE, G. M., MAINKA, S. A., MCNEELY, J. A., MITTERMEIER, R. A., REID, G. M., RODRIGUEZ, J. P., ROSENBERG, A. A., SAMWAYS, M. J., SMART, J., STEIN, B. A. & STUART, S. N. 2010. The impact of conservation on the status of the world's vertebrates. Science 330:1503–1509.CrossRefGoogle ScholarPubMed
HOWARD, F. W., HAMON, A., MCLAUGHLIN, M. & WEISSLING, T. 1999. Aulacaspis yasumatsui (Homoptera: Sternorrhyncha: Diaspididae), a scale insect pest of cycads recently introduced into Florida. Florida Entomologist 82:14–27.CrossRefGoogle Scholar
JOANES, D. N. & GILL, C. A. 1998. Comparing measures of sample skewness and kurtosis. The Statistician 47:183–189.CrossRefGoogle Scholar
KEANE, R. M. & CRAWLEY, M. J. 2002. Exotic plant invasions and the enemy release hypothesis. Trends in Plant Science 17:164–170.Google Scholar
KEPPEL, G. 2001. Notes on the natural history of Cycas seemannii (Cycadaceae). South Pacific Journal of Natural History 19:35–41.Google Scholar
LÁZARO-ZERMEÑO, J. M., GONZÁLEZ-ESPINOSA, M., MENDOZA, A., MARTÍNEZ-RAMOS, M. & QUINTANA-ASCENCIO, P. F. 2011. Individual growth, reproduction and population dynamics of Dioon merolae (Zamiaceae) under different leaf harvest histories in Central Chiapas, Mexico. Forest Ecology and Management 261:427–439.CrossRefGoogle Scholar
LILLIEFORS, H. 1967. On the Kolmogorov–Smirnov test for normality with mean and variance unknown. Journal of the American Statistical Association 62:399–402.CrossRefGoogle Scholar
LIU, H. & STILING, P. 2006. Testing the enemy release hypothesis: a review and meta-analysis. Biological Invasions 8:1535–1545.CrossRefGoogle Scholar
MANION, P. 1981. Tree disease concepts. Prentice Hall, Englewood Cliffs. 399 pp.Google Scholar
MARLER, T. E. & HIRSH, H. 1998. Guam's Cycas micronesica population ravaged by Supertyphoon Paka. HortScience 33:1116–1118.CrossRefGoogle Scholar
MARLER, T. E. & MOORE, A. 2010. Cryptic scale infestations on Cycas revoluta facilitate scale invasions. HortScience 45:837–839.CrossRefGoogle Scholar
MARLER, T. E. & MOORE, A. 2011. Military threats to terrestrial resources not restricted to wartime: a case study from Guam. Journal of Environmental Science & Engineering 5:1198–1214.Google Scholar
MARLER, T. E. & MUNIAPPAN, R. 2006. Pests of Cycas micronesica leaf, stem, and male reproductive tissues with notes on current threat status. Micronesica 39:1–9.Google Scholar
MARLER, T. E., LINDSTRÖM, A. & FISHER, J. B. 2010. Stem tissue dimensions correlate with ease of horticultural management for six Cycas species. HortScience 45:1293–1296.CrossRefGoogle Scholar
McDOWELL, N., POCKMAN, W. T., ALLEN, C. D., BRESHEARS, D. D., COBB, N., KOLB, T., PLAUT, J., SPERRY, J., WEST, A., WILLIAMS, D. G. & YEPEZ, E. A. 2008. Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought? New Phytologist 178:719–739.CrossRefGoogle ScholarPubMed
MEYER, J.-Y. & BUTAUD, J.-F. 2009. The impacts of rats on the endangered native flora of French Polynesia (Pacific Islands): drivers of plant extinction or coup de grâce species? Biological Invasions 11:1569–1585.CrossRefGoogle Scholar
MOIR, M. L., VESK, P. A., BRENNAN, K. E. C., KEITH, D. A., MCCARTHY, M. A. & HUGHES, L. 2011. Identifying and managing threatened invertebrates through assessment of coextinction risk. Conservation Biology 25:787–796.CrossRefGoogle ScholarPubMed
MOORE, A., MARLER, T., MILLER, R. H. & MUNIAPPAN, R. 2005. Biological control of cycad aulacaspis scale on Guam. The Cycad Newsletter 28:6–8.Google Scholar
MUELLER-DOMBOIS, D. 1986. Perspectives for an etiology of stand-level dieback. Annual Review of Ecology and Systematics 17:221–243.CrossRefGoogle Scholar
MUELLER-DOMBOIS, D. 1987. Natural dieback in forests. Bioscience 37:575–583.CrossRefGoogle Scholar
NEGRON-ORTIZ, V. & BRECKON, G. J. 1989. Population structure in Zamia debilis (Zamiaceae) I. Size classes, leaf phenology, and leaf turnover. American Journal of Botany 76:891–900.CrossRefGoogle Scholar
NIKLAS, K. J. & MARLER, T. E. 2008. Sex and population differences in the allometry of an endangered cycad species, Cycas micronesica (Cycadales). International Journal of Plant Sciences 169:659–665.CrossRefGoogle Scholar
NORGHAUER, J. M., MARTIN, A. R., MYCROFT, E. E., JAMES, A. & THOMAS, S. C. 2011. Island invasion by a threatened tree species: evidence for natural enemy release of mahogany (Swietenia macrophylla) on Dominica, Lesser Antilles. PLoS ONE 6 (4): e18790.CrossRefGoogle ScholarPubMed
NORSTOG, K. J. & NICHOLLS, T. J. 1997. The biology of the cycads. Cornell University Press, New York. 363 pp.Google Scholar
PÉREZ-FARRERA, M. A. & VOVIDES, A. P. 2004a. Spatial distribution, population structure, and fecundity of Ceratozamia matudai Lundell (Zamiaceae) in El Triunfo Biosphere Reserve, Chiapas, Mexico. The Botanical Review 70:299–311.CrossRefGoogle Scholar
PÉREZ-FARRERA, M. A. & VOVIDES, A. P. 2004b. Ecology of cycads in Southern Mexico. Pp. 112–120 in Lindström, A. J. (ed.). Proceedings of the Sixth International Conference on Cycad Biology. Nong Nooch Tropical Garden, Thailand. 216 pp.Google Scholar
PÉREZ-FARRERA, M. A., VOVIDES, A. P., OCTAVIO-AGUILAR, P., GONZÁLEZ-ASTORGA, J., DE LA CRUZ-RODRÍGUEZ, J., HERNÁNDEZ -JONAPÁ, R. & VILLALOBOS-MÉNDEZ, S. M. 2006. Demography of the cycad Ceratozamia mirandae (Zamiaceae) under disturbed and undisturbed conditions in a biosphere reserve of Mexico. Plant Ecology 187:97–108.CrossRefGoogle Scholar
PYKE, D. A. & THOMPSON, J. N. 1986. Statistical analysis of survival and removal rate experiments. Ecology 67:240–245.CrossRefGoogle Scholar
SCHEMSKE, D., HUSBAND, B., RUCKELSHAUS, M., GOODWILLIE, C., PARKER, I. & BISHOP, J. 1994. Evaluating approaches to the conservation of rare and endangered plants. Ecology 75:584–606.CrossRefGoogle Scholar
TAKAGI, S. 1977. A new species of Aulacaspis associated with a cycad in Thailand (Homoptera: Cocoidea). Insecta Matsumurana New Series 11:63–72.Google Scholar
TANG, W., YANG, S.-L. & VATCHARAKORN, P. 1997. Cycads of Thailand. Nong Nooch Tropical Garden and the Cycad Conservation Company. Bangkok, Thailand. 34 pp.Google Scholar
TERRY, I. & MARLER, T. 2005. Paradise lost? Tipping the scales against Guam's Cycas micronesica. The Cycad Newsletter 28:21–23.Google Scholar
VOVIDES, A. P. 1990. Spatial distribution, survival, and fecundity of Dioon edule (Zamiaceae) in a tropical deciduous forest in Veracruz, Mexico, with notes on its habitat. American Journal of Botany 77:1532–1543.CrossRefGoogle Scholar
WILCOXON, F. 1945. Individual comparisons by ranking methods. Biometrics Bulletin 1:80–83.CrossRefGoogle Scholar
YOUNG, F. J. 1988. Soil survey of Territory of Guam. United States Department of Agriculture Soil Conservation Service. 166 pp.Google Scholar