{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

SG_Unit_I_Day_5

SG_Unit_I_Day_5 - Keesha Fausto Study Guide Unit I(Ecology...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Keesha Fausto Study Guide: Unit I (Ecology) Day 5 - Community Ecology Read: Campbell, Chapter 53, pp. 1159-1164 1. Define the ecological concept of “community.” - That which is an assemblage of populations of various species living close enough for potential interaction. 2. a. Define interspecific competition as a –/– interaction. Ecologists refer to key relationships in the life of an organism of interactions with other species in a community as interspecific interactions. Interspecific competition which is part of occurs when species compete for a particular resource that is in short supply. When two species do compete for a resource, the result is usually detrimental to one or both species, which can be termed as –/–, or of loss to one or two of those species competing for resource. Someone usually ends up losing. b. Define “ecological niche” and state the competitive exclusion principle using this term. -The sum of a species’ use of the biotic resources in its environment. Two species cannot coexist in a community if their niches are identical; therefore, the principle of competitive exclusion, which states that since no two species can occupy the same exact niche, the “more fit” species will dominate, fully explains this concept and gives validity to the ecological niche definition. c. Explain (using the terms fundamental and realized niche) how manipulating barnacle populations provides direct experimental evidence of the impact of competition on niche size. -The niche a species might potentially occupy, whereas a realized niche refers to the niche that the species actually occupies in a particular environment. Ecologist Joseph Connell wanted to see if specie’s niche could be influenced by interspecific competition. He studied the Balanus balanoides barnacles, which do not survive on high rock because they may dry out at low tide, vs. the Chthamalus stellatus barnacle, which is usually concentrated at the top of high rocks. Balanus’s realized niche is therefore pretty much its fundamental niche. He wanted to determine the Chthamalus niche, thus removed Balanus. Astonishingly enough, Chthamalus spread to the bottom of the rock as well, thus declaring that it can potentially have a larger realized niche that it really occupies. d. Define resource partitioning, and explain how Anolis species (at La Palma in the Dominican Republic) provide an example of it. Resource partitioning refers to the differentiation in niches that enable similar species to coexist in an environment. Not only does this mean partitioning of food, but also of space, time, and territory. The Anolis lizard species in the Dominican Republic perfectly exhibit this theory of resource partitioning because of their living in such close proximity. They all feed on insects and other small arthropods, but what sets them apart is there different perches they particular. In this case, resource partitioning is of food.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}