The plants frequently captured greater proportions of their own pollen. Only the spring pollen was filtered in sufficient numbers to obtain minimum pollen counts of 200 grains by all 3 taxa. Pollen captured by smooth Cercidium was consistently low (X̄ = 31 grains cm-2). Sticky Larrea leaves continuously captured airborne pollen (X̄ = 246 grains cm-2). Of the species investigated, the Sphaeralcea leaves filtered the greatest number of spring pollen grains from the air (3419 grains cm-2) captured pollen was very low during other seasons. Pollen grains collected from the surfaces of the plants were most numerous during the spring when (airborne) pollen concentrations were high. I examined the filtration of atmospheric pollen by Larrea iridenata leaves (resinous, with sparse recumbent hairs), Cercidium microphyllum twigs (glabrous with recumbent hairs) and Sphaeralcea ambigua leaves (covered with stellate hairs) and evaluated the potential biases of scavenged pollen on the interpretation of pollen records from middens. Airborne pollen is contributed to middens both directly from the air, and through adherence to plant macrofossils. N2 - Fossil packrat middens are used to reconstruct late Quaternary environments in the arid Western U.S.A. Pollen content of packrat middens will reflect the season of plant macrofossil collection and the species composition of the plants incorporated.",
![packrat arizona packrat arizona](http://justineschluntz.com/wp-content/uploads/2017/01/packrat-feature-image-980x735.png)
Sticky Larrea leaves continuously captured airborne pollen ( = 31 grains cm-2). Pollen content of packrat middens will reflect the season of plant macrofossil collection and the species composition of the plants incorporated.Ībstract = "Fossil packrat middens are used to reconstruct late Quaternary environments in the arid Western U.S.A.
![packrat arizona packrat arizona](https://1.bp.blogspot.com/-PiR_3YuTBtY/T4uLeCr0igI/AAAAAAAAEp4/rkJ7b9kaqhA/s1600/22+packrat+midden,+Cave+Springs+Trail.jpg)
Pollen captured by smooth Cercidium was consistently low (X̄ = 31 grains cm -2). Sticky Larrea leaves continuously captured airborne pollen (X̄ = 246 grains cm -2).
![packrat arizona packrat arizona](http://www.bugzapperpestcontrol.com/blog/wp-content/uploads/2016/06/91ED3840-155D-451F-671875EDF1385926.jpg)
Of the species investigated, the Sphaeralcea leaves filtered the greatest number of spring pollen grains from the air (3419 grains cm -2) captured pollen was very low during other seasons. Fossil packrat middens are used to reconstruct late Quaternary environments in the arid Western U.S.A.