Hesperapis oraria, Snelling and Stage (Hymenoptera: Melittidae) is endemic to northern coastal habitats of the Gulf of Mexico and is a pollen specialist of floral host Balduina angustifolia Pursh. (Asteraceae). Specialization and restricted geographic distribution along the coast of the Gulf of Mexico warrants further investigation into habitat requirements of the bee. This study quantifies the habitat use of H. oraria in association with B. angustifolia distribution at regional and landscape spatial scales using a classification tree species distribution modeling approach. Hesperapis oraria density was lower on barrier island sites compared with coastal mainland sites; no H. oraria were found on non-coastal mainland sites. The regional distribution of H. oraria was driven by the number of B. angustifolia patches, while at the landscape scale H. oraria presence was predicted most strongly by B. angustifolia patch area, plant density, as well as distance from ephemeral wetlands. The regional distribution of B. angustifolia was influenced by the proximity to the bay and within a landscape B. angustifolia distribution was strongly influenced by the stability of the landscape feature in which it was found.

中文翻译：

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在墨西哥湾北部的两个空间尺度上，一种有风险的、单一的、地面筑巢的蜜蜂 Hesperapis oraria 及其花宿主 Balduina angustifolia 的栖息地适宜性

Hesperapis oraria、Snelling 和 Stage（膜翅目：蜂蜂科）是墨西哥湾北部沿海栖息地的特有种，是花卉寄主 Balduina angustifolia Pursh 的花粉专家。（菊科）。墨西哥湾沿岸的专业化和有限的地理分布需要进一步调查蜜蜂的栖息地要求。本研究使用分类树种分布建模方法在区域和景观空间尺度上量化了 H. oraria 的栖息地利用与 B. angustifolia 分布。与沿海大陆站点相比，屏障岛站点的 Hesperapis oraria 密度较低；在非沿海大陆站点上未发现 H. oraria。H. oraria 的区域分布由 B. angustifolia 斑块的数量驱动，而在景观尺度 H. 通过 B. angustifolia 斑块面积、植物密度以及与短暂湿地的距离，最强烈地预测了 oraria 的存在。B. angustifolia 的区域分布受靠近海湾的影响，并且在景观中，B. angustifolia 的分布受到发现它的景观特征稳定性的强烈影响。