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Cray Fish Lab Report

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Crayfish Response In this experiment the researchers were investigating the limited range of the crayfish species Orconectes saxatilis in the upper part of the Kiamichi River. The dispersal of the crayfish species O. saxatilis and two sympatric crayfish species throughout the upper part of the Kiamichi River were examined. The type of habitat that the crayfish favor for use was also examined along with their historical characteristics. Crayfish species with small habitats are in major need of conservation but little information is known about species-specific habitats. The question that the researchers were asking in this experiment was what are the primary factors that limit the distribution of the species O. saxatilis in the Kiamichi River. …show more content…

The first figure helped understand the location of the different tributaries in the upper Kiamichi River being used in the experiment. The first table helped highlight the point that the known range of O. saxatilis was shown to have increased and that the sympatric species P. tenius inhabits the same streams as O. saxatalis compared to the other sympatric species. Table 2 helped demonstrate that depth and flow velocity differed between riffles and pools especially between the dry and wet periods. This showed that the difference in water levels between riffles and pools could affect the habitat that the crayfish is living in and their preference for a certain environment. The other abiotic factors did not vary dramatically, which showed that they do not affect crayfish distribution. Figure 2 demonstrated the difference in substrate composition between riffles and pools throughout the Kiamichi River and the results showed that the differences were caused by the different distribution of cobble and boulder substrates. This pointed out that the different substrate compositions could affect the habitat of the crayfish and determine where they live. Figure 3 was very important in understanding the conclusion of the experiment because it demonstrated that O. …show more content…

saxatilis. The results and figures strongly supported this conclusion by illustrating the high densities of O. saxatilis present in riffles compared to pools, the broader distribution found in the Kiamichi River, the substrate composition of riffles, and the different water densities of riffles compared to pools at different times of the year. The conclusion is directly related to the question being asked in the experiment and offers an explanation for the small range of O.

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