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Plant Analysis : Plants And Diversify Our Ecosystems

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Plants shape and diversify our ecosystems by providing a number of different resources to the communities they surround. Plant ecology is important for predicting plant distribution and abundance for the maintenance of our ecosystems. Studying plant-consumer interactions yields information on ecosystem and economic stability, as well as community structure that can all lead to a variety of conservation efforts. Herbivory is a driving factor that can be detrimental to plant communities like the spruce budworm throughout Canada (Swetman and Lynch 1989, Alfaro et al. 1982, Morin 1994) or can maintain high diversity within the community as suggested by the Janzen-Connell hypothesis (Janzen 1970, Connell 1971).
Herbivores can range from large …show more content…

Such ranges of herbivores will induce different plant defense strategies. Many host plants have natural physical defensive strategies such as waxy leaf cover, leaf wax layers, and thorns to prevent or limit predation (Grubb 1992). Plants can also limit their exposure to herbivores by flowering for short periods of time, such as the short flowering time of the Thymus decussatus (Sinai Thyme) (Thompson and Gilbert 2014). Phenological shifts used as defensive strategies may ensure that co-evolution only occurs between a small number of specialist herbivores, limiting the herbivory density. Additionally, some plants will release defensive chemicals to fight herbivorous insects. The potency of these chemicals will depend on the predatory insect and whether the insect is a generalist or specialist herbivore (Ali and Agrawal 2012, Viswanathan et al. 2005, Steinbrenner et al. 2011). Generalists are thought to evoke a stronger response to defensive chemicals than specialists. When the comparison was drawn between a generalist herbivore Helicoverpa zea (corn earworm) and a specialist herbivore Manduca sexta (Tobacco hornworm) the host plant Solanum lycopersicum (tomato plant) responded differently. H. zea strongly affected defense-related metabolite concentrations while M. sexta induced an increase of carbon and nitrogen to the damaged tissues which most likely wouldn’t alter the palatability of the leaves significantly

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