Displacement of Native Riparian Shrubs by Woody Exotics: Effects on Arthropod and Pollinator Community Composition
Displacement of Native Riparian Shrubs by Woody Exotics: Effects on Arthropod and Pollinator Community Composition
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外来木本植物对原生河岸灌木的取代：对节肢动物和传粉者群落组成的影响
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
D. Finch
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作者：
R. Pendleton;B. Pendleton;D. Finch
在整个美国西南部，棉白杨和杨柳的河岸走廊森林正被外来的木本植物入侵，主要是俄罗斯橄榄树和盐雪松。我们想知道这可能对本地传粉者种群产生什么影响。传粉者是生物多样性、生态系统健康和人类粮食生产不可或缺的贡献者。最近传粉者数量和健康状况的下降，例如蜂群崩溃失调导致蜜蜂种群的灾难性下降，重新引起了人们对本地传粉者及其提供的生态系统服务的兴趣。昆虫收集从杨柳，俄罗斯橄榄和盐雪松整个4月和1997年和1998年5月使用扫网。在每个收集日，在目标灌木丛上清扫特定数量的网，以确保平等的收集工作。对昆虫进行计数并按家族进行识别。总人数按清扫天数调整。总的昆虫丰度是最大的柳树（33.5昆虫每扫天），其次是俄罗斯橄榄（18.0）和盐雪松（6.8）。柳树也有最多的昆虫目和科的代表。四个主要的昆虫传粉者订单，杨柳有最大数量的双翅目，hyperterans，鳞翅目昆虫收集每扫天。俄罗斯橄榄的鞘翅目数量最多。当蚂蚁和小玉髓被排除在水螅类之外时，柳树仍然拥有最大数量和比例的水螅类。看来杨柳的栖息地对授粉昆虫，特别是蜜蜂很重要。相比之下，盐雪松在所有四种传粉昆虫目中的数量和比例始终最低。
Throughout the southwestern U.S., riparian gallery forests of cottonwood and willow are being invaded by woody exotics, primarily Russian olive and salt cedar. We wondered what effect this might have on native pollinator populations. Pollinators are indispensable contributors to biodiversity, ecosystem health, and human food production. Recent declines in pollinator abundance and health, such as catastrophic declines in honey bee populations due to Colony Collapse Disorder, has renewed interest in native pollinators and the ecosystem services they provide. Insects were collected from willow, Russian olive and salt cedar throughout April and May of 1997 and 1998 using sweep nets. For each collection day, nets were swept over the target shrubs for a specified number for passes to ensure equal collection effort. Insects were counted and identified to family. Total numbers were adjusted by number of sweep-days. Total insect abundance was greatest for willows (33.5 insects per sweep-day), followed by Russian olive (18.0) and salt cedar (6.8). Willows also had the greatest number of insect orders and families represented. Of the four primary insect pollinator orders, willow had the greatest numbers of dipterans, hymenopterans, and lepidopterans collected per sweep-day. Russian olive had the greatest number of coleopterans. When ants and chalcids were excluded from the hymenopterans, willows still had the greatest numbers and proportions of hymenopterans caught. It appears that the willow habitat is important to pollinating insects, especially bees. In contrast, saltcedar consistently had the lowest numbers and proportions of all four of the pollinator orders.