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Oecologia

Title:		Manipulation of food resources by a gall-forming aphid: the physiology of sink-source interactions
Author(s):		Larson KC; Whitham TG;
Address:		"Department of Biological Sciences, Northern Arizona University, 86011, Flagstaff, Arizona, USA"
Journal Title:		Oecologia
Year:		1991
Volume:		88
Issue:		1
Page Number:		15 - 21
DOI:		10.1007/BF00328398
ISSN/ISBN:		1432-1939 (Electronic) 0029-8549 (Linking)
Abstract:		"We examined the capacity of the galling aphid, Pemphigus betae, to manipulate the sink-source translocation patterns of its host, narrowleaf cottonwood (Populus angustifolia). A series of (14)C-labeling experiments and a biomass allocation experiment showed that P. betae galls functioned as physiologic sinks, drawing in resources from surrounding plant sources. Early gall development was dependent on aphid sinks increasing allocation from storage reserves of the stem, and later development of the progeny within the gall was dependent on resources from the galled leaf blade and from neighboring leaves. Regardless of gall position within a leaf, aphids intercepted (14)C exported from the galled leaf (a non-mobilized source). However, only aphid galls at the most basal site of the leaf were strong sinks for (14)C fixed in neighboring leaves (a mobilized source). Drawing resources from neighboring leaves represents active herbivore manipulation of normal host transport patterns. Neighboring leaves supplied 29% of the (14)C accumulating in aphids in basal galls, while only supplying 7% to aphids in distal galls. This additional resource available to aphids in basal galls can account for the 65% increase in progeny produced in basal galls compared to galls located more distally on the leaf and limited to the galled leaf as a food resource. Developing furits also act as skins and compete with aphid-induced sinks for food supply. Aphid success in producing galls was increased 31% when surrounding female catkins were removed"
Keywords:		Galls Herbivory Phloem-parasites Sink-source Translocation;
Notes:		"PubMed-not-MEDLINELarson, Katherine C Whitham, Thomas G eng Germany 1991/09/01 Oecologia. 1991 Sep; 88(1):15-21. doi: 10.1007/BF00328398"