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Oecologia

Title:		Herbivory and resource availability shift plant defense and herbivore feeding choice in a seagrass system
Author(s):		Hernan G; Castejon I; Terrados J; Tomas F;
Address:		"Department of Marine Ecology, IMEDEA (CSIC-UIB), Mediterranean Institute for Advanced Studies, Balearic Islands, Spain. gemahmbio@gmail.com. Department of Biological Science, Florida State University, Tallahassee, FL, USA. gemahmbio@gmail.com. Department of Marine Ecology, IMEDEA (CSIC-UIB), Mediterranean Institute for Advanced Studies, Balearic Islands, Spain. Department of Fisheries and Wildlife, Oregon State University, Corvallis, OR, USA"
Journal Title:		Oecologia
Year:		2019
Volume:		20190226
Issue:		3
Page Number:		719 - 732
DOI:		10.1007/s00442-019-04364-6
ISSN/ISBN:		1432-1939 (Electronic) 0029-8549 (Linking)
Abstract:		"Numerous hypotheses have been posited to explain the observed variation in plant defense strategies against herbivory. Under resource-rich environments, plants are predicted to increase their tolerance (limiting resource model; LRM) and, while the resource availability hypothesis (RAH) predicts a decrease in constitutive resistance in plant species growing in resource-rich environments, at the intraspecific level, plants are predicted to follow an opposite pattern (intraspecific RAH). Furthermore, the effect of multiple factors in modulating plant defense strategies has been scarcely explored and is more difficult to predict. Our aim was to understand how plant defense traits respond to herbivory, resource availability and their interactions, and to assess the effects on plant palatability. To this end, we performed an in situ factorial experiment at two sites simulating three herbivory levels and two nutrient availability conditions with the seagrass Posidonia oceanica. Additionally, we performed a series of feeding experiments with its two main herbivores. While plants decreased their constitutive resistance under nutrient fertilization (contrary to intraspecific RAH but in accordance to the RAH), and did not increase allocation to tolerance (likely due to resource limitation, LRM), simulated herbivory induced resistance traits. However, we found no interactive effects of nutrient fertilization and herbivory simulation on plant defense. Both herbivores responded similarly to changes in plant palatability, strongly preferring nutrient-enriched plants and non-clipped plants. This work highlights the need to better understand the drivers of plant defense intraspecific variability in response to resources, particularly in habitat-forming species where changes in plant traits and abundance will cascade onto associated species"
Keywords:		*Alismatales Ecosystem *Herbivory Phenotype Plants Limited resource model Nutrients Plant-herbivore interactions Posidonia oceanica Resource availability hypothesis;
Notes:		"MedlineHernan, Gema Castejon, Ines Terrados, Jorge Tomas, Fiona eng CTM2011-27377/Ministerio de Economia, Industria y Competitividad, Gobierno de Espana/ CGL2014-58829-C2-2-R/Ministerio de Economia, Industria y Competitividad, Gobierno de Espana/ Germany 2019/02/27 Oecologia. 2019 Mar; 189(3):719-732. doi: 10.1007/s00442-019-04364-6. Epub 2019 Feb 26"