Global Biodiversity : Indicators And Decline

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Global Biodiversity: Indicators and Decline Quantitative Methods Study: Marine Trophic Level Data Replication Study overview: In response to millennium goals set by the Convention on Biodiversity (CBD) which aimed to “achieve by 2010 a significant reduction in biodiversity loss”, world leaders created a “framework of indicators to measure biodiversity loss at the level of genes, population, species and ecosystems.” The authors of this paper compiled 31 of these indicators to report on progress towards CBD goals. Some examples of these indicators included: the Marine Trophic Index, Wild Bird Index, Ecological footprint, and Nitrogen Deposition Rate. The researchers evaluated a variety of indices; our replication study focuses specifically on findings from the Marine Trophic Index (MTI). The Marine Trophic Index is a metric designed to report on the phenomenon of fishing down trophic levels. Figure 1: shows how the mean size of fish catch decreases over time as fishers turn to smaller and smaller feedstock as the abundance of larger predatory and apex species decreases due to overfishing. Study Data: MTI Data is available for review here. The Study data cataloged the year, mean trophic level, mean max length of catch in cm, FiB Index and expansion factor. Variable Definitions: Year: Year of survey Data Mean Trophic Level: The average trophic catch. FiB Index: “A Fishing-in-Balance (FiB) index can be defined that has the property of increasing if catches increase
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