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
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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
This experiment, which was used to explore the Theory of Evolution created by Charles Darwin. The use of natural selection was apparent in the artificial modification of an organism's traits which aided in this investigation. Through this experiment the Wisconsin Fast Plant was used. It is a fast-growing organism developed to improve the resistance to disease in cruciferous plants. This plant aids scientist in the exploration of environmental effects on population due to the speed to which is matures and reproduces. Artificial selection was stimulated by the selection against plants with few hairs(trichomes). Trichomes create a wider variation which means it is polygenic. The plants that had only a few trichomes were
Symbiotic Mutualisms: Plant provide energy and protection to the fungus while the fungus helps the plant absorb nutrients from the soil.
One concern that frequently emerges with regard to invasive species is whether or not they will have a significant impact on the economy, especially with regard to agriculture. This is especially the case as in relation to insects, which can cause major crop losses (Myers et al. 2000). However, this sort of impact is not limited to insects; other animals can graze on crops, and other plants can compete with crops. It is also possible for plants to provide a habitat for insects that may be harmful to crops. An analysis of the impact Verbascum has on arthropod population dynamics suggests that this may be the case, and it appears as though they may provide a place for certain pests to live during the winter. However, this same analysis also concluded that the plants also provided a home for many beneficial insects and that whether the net impact they had on other crops is ambiguous and likely to be highly context-dependent (Horton & Lewis 2003). Even if one decided that the risk of these plants posed by the potential to pose pests was severe, then it is not clear that one would actually solve this problem through eradication. This is largely because it does not seem unlikely that these pests could find some other, native plant that they could utilize instead, though this is only speculation. Furthermore, a different experiment provides more support for the idea that, under certain
Common soil invertebrates include arthropods and nematodes. These soil invertebrates provide major ecosystem services. For example, ants, dung beetles, ground beetles, earthworms, and slugs aid in seed dispersal, which is important because seed dispersal is known to affect food production and nutrient recycling as well as decomposition rates. Bees, butterflies, moths, and ants aid in pollination. These invertebrates are very important because about three-fourths of all plants are pollinator dependent and insects tend to provide most of the animal pollination globally. Without pollinators plant species would be more susceptible to extinction. In agricultural systems, invertebrate pollinators are responsible for the successful production of vegetables and fruits that maintain livestock production. Nematodes, annelids, and arthropods aid in decomposition (Prather et al., 2012)
Many of the earth’s plant species depend upon insects to pollinate them. Carnivorous insects, such as the praying mantis, control the ‘pest’ insect population.
Plants form the foundation on which communities and ecosystems are assembled and which food webs are created. Accordingly, the understanding of factors that establish plant distribution, abundance is essential for our understanding of ecology at large. As major constituents of most ecosystems and chronic agents of plant damage, consumers have great potential to heavily impact plant abundance and distribution (Maron and Crone 2006). Particularly, herbivore populations like Eurosta solidaginis typically sustain heavy attacks from tortuous arrays of natural enemies (Bergman and Tingey 1979). They frequently encounter parasitoid wasps and avian predators, which impact the survival of the gallmakers. If a survivorship varies among gallmakers with different traits, natural enemy attacks can potentially alter their traits in later generations (Warren et al. 1989). Based upon other experiments
Within ecological communities, species diversity is often associated with the amount of disturbance within that environment (Yeboah and Chen, 2016). These disturbance factors are becoming more prominent as human involvement within these environments increase (Pickering and Growcock, 2009). In fact, Cole and Monz (2002) assert that the recreational trampling of vegetation within these natural environments create a negative impact that should be monitored and ultimately maintained. This disturbance within the environment could not only lead to a lowering of species
Chapter one of Flora and Flora’s “Rural Communities: Legacy and Change” gives reader a view on what community and community capital is. The chapter also discusses what is considered rural and what changes have occurred in rural communities, institutions, government and public interests as well as the changes which have occurred in rural communities. Define terms
Plants play many roles in the environment, the biggest being that they produce oxygen, but they also provide people with food and medicine. Without plants, there would be no oxygen available to living organisms. Every time people inhale, “it is the oxygen that we
All organisms interact with members of the same or different species. Two organisms may interact in such a way as one or both organisms are helped, unchanged, or harmed. Competition results when an interaction between two organisms harms both organisms due to the two organisms competing for limited resources. In the case of plants, the limiting resources they compete for include water, nutrients, light, and heat. The strongest competition usually results from competition between root systems over nutrients and groundwater as compared to competition between shoots (Wilson 279). Knowing the causes and extent of interspecific and intraspecific competition among plants is vital to the agricultural industry because two plants in which the interspecific competition
In part, this is explained by the novel weapons hypothesis which predicts that invasive plant species produce chemicals that are novel to generalists of introduced ranges, requiring adaptive evolution for invasives to become palatable to generalists (Lankau et al., 2004). It is also generally accepted that invasives tend to alter the soil composition of their introduced ranges (Zou et al., 2006). In some instances, it is evident that generalists do not feed on invasives in introduced ranges because they lack the behavioral adaptations necessary to do so (Lankau et al., 2004). In 2002, a greenhouse study was performed in LaMarque, Texas where grasshoppers (M. augustipennis) were placed large mesocosms with Triadica and Celtis (common hackberry) to determine possible behavioral shifts of herbivores when confined to a single food source (Lankau et al., 2004). In fact, grasshoppers exhibited more herbivory on the exotic Triadica genotypes when compared to relative consumption of native Celtis genotypes (Lankau et al., 2004). This study suggests that Triadica sebifera is indeed palatable to generalist herbivores like grasshoppers in its introduced ranges. Generalists, however, require selective pressure in order to shift their diets to invasive species like Triadica sebifera (Lankau et al., 2004). Generalist herbivores display no detrimental effects
Galls are important because they reflect the condition of plant health and abundance in a specific ecosystem. Gall-inducing species are excellent models for ecological studies due to their abundance, diversity, and sessile habit, which make them easier to census than free-feeding herbivores. This can allow species diversity comparisons among different habitats (Fernandes, 1988).
Staggered Flora is a center for large scale educational collaboration. Two buildings angle towards each other to form a central courtyard while appearing to be a support system for the second level. In addition, this level both literally and figuratively elevate the library and educational galleries. These space, are the only visible portion of the center from the parking lot, underscoring the importance of education.
2003; Vázquez & Aizen 2004; Dupont et al. 2009). Currently, one of the most complicated challenges is to explain which the factors that explain plant-pollinator interaction patterns are (see Fenster et al. 2004; Danieli-Silva 2012; Rosas-Guerrero et al. 2014). Such plant-pollinator interactions are determined by pollinators, which feed on floral rewards, such as nectar, pollen, scents, floral oils and resins (Faegri and van der Pijl, 1979; Simpson & Neff 1981). So that, plant-pollinator interactions are determined by the biology as well as the choices of pollinators. At a first level, these interactions are defined by the coincidence between the flowering periods of plant species and activity periods of antophiles (Herrera 1988; Bosch et al. 1997). Secondly, pollinators choose between the different plant species based on a mixture of innate preferences (Heuschen et al. 2005, Rodriguez et al. 2005, Dormont et al. 2010, Willmer 2011) and by subsequent associative learning. In this framework, several studies have shown that certain floral traits are related to reward abundance and quality (Smithson & Macnair 1997; Blarer et al. 2002; Schaefer et
Humans depend on plants in numerous ways. One reason we depend on plants is for consumption. Plants have the unique ability of producing their own food through a process called photosynthesis. In this process, plants are able to produce macromolecules such as carbohydrates that cannot be produced in animals or humans. In humans, the only to gain these macromolecules is to consume plant matter, or consume plant-eating animals (herbivores).