Homework 3 - Rewiring food webs(1)

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University of Toledo *

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3050

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Biology

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Feb 20, 2024

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EEES 3050, General Ecology Homework 3 based on scientific paper reading 5 points Due: 11/9/2023 by 11:59pm Name: Dana Muhsen Read the following paper by Bartley et al. 2018 in Nature Ecology & Evolution . Answer the following questions with the appropriate depth and breadth (length requirement listed after each question). Note: Some questions will likely require more than a few sentences to answer thoroughly. 1. What is meant by food web “rewiring?” What would be an example of a rewired aquatic or terrestrial food web? (5 or more sentences) Food web ‘rewiring’ refers to a significant change or alteration in the connections and interactions between species in a food web, and it occurs when their relationships are disrupted or restructured. There are two types of food web rewiring that are a result of differing circumstances: topological rewiring and interaction strength rewiring. Topological rewiring is the changes in the topology of a food web due to either the introduction or loss of a species. Interaction strength rewiring is the change of energy flow in trophic levels as a result of changes in consumption patterns. An example of a rewired aquatic food web is the addition of a predatory fish species in an ecosystem that was stable before its introduction. This would disrupt the balance within the food web because the prey species would decrease resulting in a cascading effect that effects the whole ecosystem. 2. Describe two examples of how certain habitats may become inhospitable due to climate change. (5 or more sentences) Climate change can render habitats inhospitable in various ways. One example of this is rising temperatures causing altered precipitation patterns leading to prolonged droughts. This would cause the expansion of an arid ecosystem resulting in limited access to water and food. With these dry conditions, the population of species have the potential to decline simply because it becomes more difficult to get the basic necessities for survival. Another example is the rising sea levels due to the melting polar ice caps and glaciers negatively impacting coastal habitats. These coastal areas experience flooding which can disrupt a species’ life cycle by destroying land needed for breeding, foraging, and shelter. Not allowing them the ability to reproduce or survive long enough to even have the chance. 3. In a few sentences, what is one new thing you learned? (4 or more sentences) I had never heard of food web ‘rewiring’ before in any of my other lectures. Reading this article was my first introduction to it, so the concept as a whole was new to me. I thought it was an interesting concept to learn because studying the effects of ‘rewiring’ provides valuable insights into ecosystem resilience and adaptation. It also helps to bring awareness towards the importance of conserving biodiversity.

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