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absolute pollen frequency

absolute pollen frequency (APF) The expression of pollen data from sediments, expressed in terms of the absolute numbers (for each species, genus, or family) per unit of volume of sediment and, where deposition rates are known, per unit of time. In certain circumstances this approach gives clearer information than does the traditional way of expressing pollen data as relative pollen frequencies (RPF). APFs are particularly useful in site comparisons in which one or more high pollen producers vary. For example, when trees first appear in the regional pollen rain their prolific pollen may, in an RPF method, give the impression of declining herbaceous species, whereas examination by an APF method will show constant values for herb species.

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"absolute pollen frequency." A Dictionary of Ecology. . Encyclopedia.com. 25 Apr. 2018 <http://www.encyclopedia.com>.

"absolute pollen frequency." A Dictionary of Ecology. . Encyclopedia.com. (April 25, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency-0

"absolute pollen frequency." A Dictionary of Ecology. . Retrieved April 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency-0

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absolute pollen frequency

absolute pollen frequency (APF) Pollen data from sediments, expressed in terms of the absolute numbers for each species, genus, or family, per unit volume of sediment and, where deposition rates are known, per unit time. In certain circumstances this approach gives clearer information than does the traditional way of expressing pollen data as relative pollen frequencies (RPF). APFs are particularly useful in site comparisons in which one or more high pollen producers vary. For example, when trees first appear in the regional pollen rain their prolific pollen may, in an RPF method, give the impression of declining herbaceous species, whereas examination by an APF method will show constant values for herb species.

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"absolute pollen frequency." A Dictionary of Earth Sciences. . Encyclopedia.com. 25 Apr. 2018 <http://www.encyclopedia.com>.

"absolute pollen frequency." A Dictionary of Earth Sciences. . Encyclopedia.com. (April 25, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency

"absolute pollen frequency." A Dictionary of Earth Sciences. . Retrieved April 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency

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Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

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American Psychological Association

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Notes:
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  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

absolute pollen frequency

absolute pollen frequency (APF) The expression of pollen data from sediments in terms of the absolute numbers (for each species, genus, or family) per unit volume of sediment and, where deposition rates are known, per unit time. In certain circumstances this approach gives clearer information than does the traditional expression as relative pollen frequencies (RPFs). APFs are particularly useful in site comparisons in which one or more high-pollen producers vary. For example, when trees first appear in the regional pollen rain their prolific pollen may, in an RPF method, give the impression of declining herbaceous species, whereas examination by an APF method will show constant values for herb species.

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"absolute pollen frequency." A Dictionary of Plant Sciences. . Encyclopedia.com. 25 Apr. 2018 <http://www.encyclopedia.com>.

"absolute pollen frequency." A Dictionary of Plant Sciences. . Encyclopedia.com. (April 25, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency-1

"absolute pollen frequency." A Dictionary of Plant Sciences. . Retrieved April 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/absolute-pollen-frequency-1

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Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

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The Chicago Manual of Style

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American Psychological Association

http://apastyle.apa.org/

Notes:
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  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.