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Keyword: pollination

Self-compatibility in Lomatium dissectum (Apiaceae) and the diverse Andrena bees that dominate regional Lomatium pollinator faunas

Publications Posted on: June 23, 2020
Species of biscuitroot (Lomatium: Apiaceae) are endemic to western North America, where multiple species can be common members of perennial wildflower communities from basin sagebrush-steppe and juniper woodlands up to alpine meadows. Despite Lomatium being the largest genus of Apiaceae in North America, little is known about its pollination needs or pollinators. Manual pollinations of the tiny flowers of one species, desert parsley (L.

Directional floral orientation in Joshua trees (Yucca brevifolia)

Publications Posted on: December 08, 2016
Joshua tree (Yucca brevifolia Engelm.) is a large, arborescent member of the yucca genus. It is an endemic and visually dominant plant in portions of the Mojave Desert, USA. We document the unique and heretofore unreported directional orientation of its flower panicles. The flower panicles grow primarily at the tips of branches that are oriented to the south.

Generalist bees pollinate red-flowered Penstemon eatonii: Duality in the hummingbird pollination syndrome

Publications Posted on: October 07, 2015
The red tubular flowers of Penstemon eatonii (Plantaginaceae) typify the classic pollination syndrome for hummingbirds. Bees are thought to diminish its seed siring potential, but we found that foraging female generalist bees (Apis, Anthophora) deposited substantial amounts of conspecific pollen on P. eatonii stigmas. In the absence of hummingbirds, bee pollination of cultivated P.

The importance of bees in natural and agricultural ecosystems

Publications Posted on: March 24, 2014
As the world’s most important group of pollinators, bees are a crucial part of agricultural production and natural ecosystem function. Bees and the pollination they provide are relevant to the nursery industry because of their role in the performance of seed increase plots as well as the importance of pollination in supporting persistent plant communities in restored areas.

Bumble bee (Hymenoptera: Apidae) community structure on two sagebrush steppe sites in southern Idaho

Publications Posted on: October 09, 2012
Although sagebrush, Artemisia spp., does not require an insect pollinator, there are several native species of bumble bees, Bombus spp. (Hymenoptera: Apidae), that are present in sagebrush steppe ecosystems where they act as pollinators for various forbs and shrubs. These native pollinators contribute to plant productivity and reproduction. We captured 12 species of bumble bees (437 individuals) at two sites during this study.

Pollinating bees crucial to farming wildflower seed for U.S. habitat restoration

Publications Posted on: October 16, 2009
Federal land managers desire seed of Great Basin perennial wildflowers, mixed with grass and shrub seed, for restoration of millions of acres of sagebrush communities degraded by altered wildfire regimes, and exotic grasses and forbs. For 15 candidate wildflower species to be farmed for seed production, all were found to need pollinators, typically bees (Apiformes), for fruit and seed production.

Breeding biologies, seed production and species-rich bee guilds of Cleome lutea and Cleome serrulata (Cleomaceae)

Publications Posted on: September 25, 2009
The summer-blooming annual forbs Cleome lutea and Cleome serrulata (Cleomaceae) are native across the US Intermountain West and Rocky Mountains, respectively. Their farmed seed is sought to help rehabilitate western rangelands in those regions. This study of the reproductive biologies and pollinator faunas of C. lutea and C. serrulata is the first for this cosmopolitan family, the sister family to the Brassicaceae.

Pollination of pima pineapple cactus (Coryphantha sheeri var. robustispina): does pollen flow limit abundance of this endangered species?

Publications Posted on: June 13, 2006
Pima pineapple cactus (PPC) (Coryphantha sheeri var. robustispina), a federally listed endangered species, occurs throughout southeastern Arizona and has relatively low population densities. To determine whether pollination limits reproduction of PPC we used florescent dye to quantify pollen flow between individuals in a PPC population.

GIS and path analysis: examining associations between the birds, the bees, and plant sex in Echinocereus coccineus (Cactaceae)

Publications Posted on: June 12, 2006
We tested hypotheses of how pollinators and water resource gradients influence the evolution of dioecy using Echinocereus coccineus, a cactus with both hermaphroditic and dioecious populations growing over wide climatic and biotic gradients in the Madrean Archipelago. A GIS database was compiled from herbarium specimens, rainfall data, and hummingbird abundance records.

Refugia, biodiversity, and pollination roles of bumble bees in the Madrean Archipelago

Publications Posted on: June 08, 2006
Eight species of bumble bees (Hymenoptera: Apidae: Bombus) are present within five major Sky Island mountains of southern Arizona. Another four species exist in the nearby large mountainous region stretching from the Arizona White Mountains to Flagstaff. The distribution and number of bumble bee species within the individual Sky Island mountains varies from six in the Catalina and Chiricahua Mountains to only one in the Santa Rita Mountains.