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Distribution of P^(32) in Ambrosia Artemisiifolia; Its Implication for Trophic Transfer Studies
Author(s) -
Shure Donald J.,
Pearson Paul G.
Publication year - 1969
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1936268
Subject(s) - ambrosia artemisiifolia , trophic level , ragweed , biology , ambrosia , botany , ecology , allergy , pollen , immunology
Tracer studies on temporal changes in P 3 2 distribution in ragweed. (Ambrosia artemisiifolia) indicated significant differences in P 3 2 activity in different organs. Activity density of flower tissue was significantly greater than of other organs throughout the study. Differences between root, stem and leaf activities were only present early in the experiment when activity densities of all organs were at their highest. The total isotope pool was originally greatest in leaf tissue, being surpassed by flower tissue during the latter part of the experiment. The differences in activity density levels indicate variable amounts of P 3 2 available to consumers which feed at different sites on ragweed. Leaf, flower, or whole plant activity density give quite different results in estimates of trophic transfer indices for two consumer species. Use of activity density measures from the actual site at which a consumer feeds is recommended for a more accurate estimation of trophic transfer.