Barnacle Lab work

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University of Illinois, Chicago *

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120

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Computer Science

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Feb 20, 2024

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Bios 120 Barnacle Competition Experiment Lab data sheet and reading questions. It is important that no part of this assignment be copied directly from another student or copied directly from an online source. For this laboratory, read this paper Battle of the barnacle newcomers: niche compression in invading species in Kaneohe Bay, Oahu, Hawaii, by Chela Zabin, published in the Marine Ecology Progress Series Read it through and take a few notes. Next, go to this website http://virtualbiologylab.org/ModelsHTML5/BarnacleCompetition/ BarnacleCompetitionModel.html Familiarize yourself with this simulation and run through a few trials.. 1) From the paper on invasive barnacles, describe the major mechanisms of interspecific competition in barnacles. A species of abundant barnacle that comes early may have a competitive advantage over another species that later meets a packed substrate and few conspecifics. The normally smaller barnacles are likely to lose out to the larger, quicker growing barnacles. 2) Which barnacles are investigated in this study? Which came first, second, and third? The following barnacles have investigated and came in the this order: 1. Balanus Amphitrite 2. Balanus Reticulatus 3. Chthamalus Proteus 3) Describe how each invading barnacle in Hawaii has changed the distribution and abundance of the others. Smaller chthamaloid barnacles may occasionally outcompete larger ones via substrate pre-emption, resulting in niche compression, if not in replacement, as opposed to larger, faster growing balanoid barnacles, which almost always win in the competition for space.
4) Describe the experimental design used in this study. There were organisms placed in quadrats in pier pilings , that were chosen at random and measured at mean low, low water, 15, 30, and 45 cm of tide, with 10 duplicates at each tidal height. 5) Run a simulation of barnacle competition. Set the sea level at 0, the tide change at 5, and the density of larvae for each barnacle at 1. Set Thais density to zero. Over time, what happens to the vertical distribution of each species? The population Chthamalus is slightly larger than that of the Belanus. The distribution of Chthamalus is generally on a higher tide, while that of the Belanus is mostly on a lower sea level. 6) Next, set the tide change to 1 and the density of Thais to 5. What happens to the vertical density of each species? The vertical density of both barnacle species is centered around the sea level. 7) Next, run two simulations using your own parameters and describe what happened. With a very high tide change, the sea level rises and falls too quickly for the Thais to consume all the barnacles. Therefore, both species are spreading more and have a higher population density.
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