Roles of scale, matrix, and native habitat in supporting a diverse suburban pollinator assemblage
Roles of scale, matrix, and native habitat in supporting a diverse suburban pollinator assemblage
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DOI：
10.1890/11-1590.1
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发表时间：
2012-10-01
影响因子：
5
通讯作者：
Wessman, Carol A.
中科院分区：
文献类型：
--
作者：
Hinners, Sarah J.;Kearns, Carol A.;Wessman, Carol A.
野生传粉者为野生和人类主导的生态系统提供重要服务，但这一群体可能受到广泛的人为景观变化的威胁。郊区蔓延是北美土地利用变化增长最快的类型之一，它具有某些特征，如丰富的花卉资源，可能有利于许多传粉者。我们研究了蔓延对美国科罗拉多前山脉短草草原野生蜜蜂群落的影响。蜜蜂的多样性，丰富度和群落组成的残草地片段所包围的郊区住宅用地与广泛的，连续的草地。郊区化对蜜蜂丰度没有整体影响，即使在研究地点内，丰度也是非常可变的。蜜蜂物种丰富度与草原栖息地面积呈非线性正相关。蜂种密度较高，更多变的郊区网站。郊区的网站和较小的栖息地面积都与相对增加的小蜜蜂物种，社会蜜蜂，和孤独的洞穴筑巢蜜蜂的组合中的比例;小郊区的栖息地面积也有利于物种的家庭Halictidae蜜蜂科，和个人的属Halictus的属Lasioglossum。在这种景观中，郊区蔓延所包围的大型原生栖息地可能会增加物种丰富度和物种密度超过连续的草地，可能是通过栖息地之间的互补或补充草地遗迹和周围的郊区矩阵。然而，在栖息地面积< 20公顷，物种丰富度变得相当可变;网站< 8公顷包含不到一半的控制物种。
Wild pollinators provide important services to both wild and human-dominated ecosystems, yet this group may be threatened by widespread anthropogenic landscape change. Suburban sprawl is one of the fastest growing types of land use change in North America, and it has certain characteristics, such as abundant floral resources, that may be beneficial for many pollinators. We examined the effects of sprawl on the wild bee assemblage of the shortgrass steppe on the Front Range of Colorado, USA. Diversity, abundance, and community composition of bees in remnant grassland fragments surrounded by suburban residential land use were compared with those in extensive, continuous grassland. No overall effect of suburbanization on bee abundance was observed, and abundance was extremely variable even within study sites. Bee species richness was positively but nonlinearly related to grassland habitat area. Bee species density was higher and more variable in suburban sites. Suburban sites and smaller habitat area were both related to relative increases in the proportions of small bee species, social bees, and solitary cavity-nesting bees in the assemblage; small suburban habitat areas also favored species of the family Halictidae over Apidae, and individuals of the genus Halictus over those of the genus Lasioglossum. In this landscape, large native habitat areas surrounded by suburban sprawl may actually increase species richness and species density over that of continuous grassland, probably by means of habitat complementation or supplementation between grassland remnants and the surrounding suburban matrix. However, at habitat areas < 20 ha, species richness became quite variable; sites < 8 ha contained less than half the species of controls.