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Constraints on the utilisation of the invasive Chinese tallow tree Sapium sebiferum by generalist native herbivores in coastal prairies

1. Introduced plants generally have lower generalist herbivore loads than native plants. Herbivores may be avoiding a potentially edible food source (Behavioural Constraint Hypothesis) or defences of introduced plants may be unusually toxic (Novel Defence Hypothesis). 2. To examine these hypotheses,...

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Published in:Ecological entomology 2004-02, Vol.29 (1), p.66-75
Main Authors: Lankau, Richard A., Rogers, William E., Siemann, Evan
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description 1. Introduced plants generally have lower generalist herbivore loads than native plants. Herbivores may be avoiding a potentially edible food source (Behavioural Constraint Hypothesis) or defences of introduced plants may be unusually toxic (Novel Defence Hypothesis). 2. To examine these hypotheses, acridid grasshoppers ( Melanoplus angustipennis and Orphullela pelidna ) were enclosed in a Texas grassland. Each enclosure contained native prairie vegetation and a seedling of either introduced Sapium sebiferum (Chinese tallow tree) or native Celtis laevigata (hackberry). Sapium invades many ecosystems in the south‐east U.S.A. Celtis seedlings also establish in these ecosystems. 3. Although grasshoppers usually feed sparingly on Sapium , in field enclosures they fed heavily on this introduced tree species, supporting a role for behavioural avoidance. In laboratory feeding trials, M. angustipennis grasshoppers preferred Sapium foliage over the foliage of three native tree species. In a greenhouse experiment, M. angustipennis individuals fed more on Sapium in prairie mesocosms if they were conditioned on Sapium . 4. In another field experiment with single seedlings in enclosures, grasshoppers consumed similar amounts of Sapium from its introduced (Texas, U.S.A.) and native (China) ranges, suggesting that Sapium may have been a suitable host plant since it was introduced. Behavioural avoidance by generalist herbivores may contribute to Sapium 's low herbivore load in its introduced range.
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Introduced plants generally have lower generalist herbivore loads than native plants. Herbivores may be avoiding a potentially edible food source (Behavioural Constraint Hypothesis) or defences of introduced plants may be unusually toxic (Novel Defence Hypothesis). 2. To examine these hypotheses, acridid grasshoppers ( Melanoplus angustipennis and Orphullela pelidna ) were enclosed in a Texas grassland. Each enclosure contained native prairie vegetation and a seedling of either introduced Sapium sebiferum (Chinese tallow tree) or native Celtis laevigata (hackberry). Sapium invades many ecosystems in the south‐east U.S.A. Celtis seedlings also establish in these ecosystems. 3. Although grasshoppers usually feed sparingly on Sapium , in field enclosures they fed heavily on this introduced tree species, supporting a role for behavioural avoidance. In laboratory feeding trials, M. angustipennis grasshoppers preferred Sapium foliage over the foliage of three native tree species. 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subjects Acrididae
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Autoecology
Behavioural constraint
Biological and medical sciences
enemies hypothesis
Fundamental and applied biological sciences. Psychology
generalist herbivore
grasshopper
invasive species
Protozoa. Invertebrata
Sapium sebiferum
title Constraints on the utilisation of the invasive Chinese tallow tree Sapium sebiferum by generalist native herbivores in coastal prairies
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