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Longitude, Forest Fragmentation, and Plant Size Influence Cycas micronesica Mortality Following Island Insect Invasions
Diversity ( IF 3.029 ) Pub Date : 2020-05-14 , DOI: 10.3390/d12050194
Thomas E. Marler , Murukesan V. Krishnapillai

Island invasions may cause severe changes in biodiversity, but the factors that influence these changes are not well understood. We established 120 plots in Cycas micronesica habitats throughout Guam in 2005 following the invasion of the armored scale Aulacaspis yasumatsui, then observed plant mortality through 2020. We used transects in Yap as benchmarks, as the Yap C. micronesica population is not threatened. The initial Guam plots contained about 1600 seedlings, 1160 juveniles, and 1240 mature plants per ha. Seedling mortality was 100% by 2006, juvenile mortality was 100% by 2014, and the 2020 census revealed 96% mortality of the plant population. Localities in western Guam and isolated forest fragments exhibited the greatest mortality, with 100% extirpation from two fragmented western localities. The juvenile and mature trees in Yap were unchanged from 2010 to 2018, but the seedling count was heterogeneous among the years. Constrained recruitment from seedlings to juveniles explained these dynamics. Yap transects contained about 6120 seedlings, 3400 juveniles, and 1250 mature plants per ha. Biological control of the invasive insects remains the acute conservation action needed for the Guam population. Lessons learned may be useful in other regions where invasions of non-native pests threaten biodiversity.

中文翻译:

经度,森林破碎度和植物大小影响岛屿昆虫入侵后密苏铁的死亡率。

岛屿的入侵可能会导致生物多样性的严重变化,但是影响这些变化的因素尚不十分清楚。在装甲规模的Aulacaspis yasumatsui入侵之后,我们于2005年在关岛的Cycas micronesica生境中建立了120个样地,然后观察到2020年的植物死亡率。我们以Yap中的样带作为基准,作为Yap C. micronesica人口没有受到威胁。关岛最初的土地每公顷约有1600株幼苗,1160株幼虫和1240株成熟植物。到2006年,幼苗死亡率为100%,到2014年,少年死亡率为100%,而2020年的人口普查显示该植物种群的死亡率为96%。关岛西部的局部地区和孤立的森林碎片显示出最大的死亡率,其中两个破碎的西部地区百分百灭绝。Yap的幼树和成熟树在2010年至2018年期间没有变化,但多年中的幼苗数量是异类的。从幼苗到少年的约束性募集解释了这些动态。Yap断面每公顷包含约6120株幼苗,3400株幼虫和1250株成熟植物。对入侵昆虫的生物控制仍然是关岛种群所需的急性保护行动。
更新日期:2020-05-14
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