# 3.2.5: Data Dive- Wildlife Corridors

$$\newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} }$$ $$\newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}}$$$$\newcommand{\id}{\mathrm{id}}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\kernel}{\mathrm{null}\,}$$ $$\newcommand{\range}{\mathrm{range}\,}$$ $$\newcommand{\RealPart}{\mathrm{Re}}$$ $$\newcommand{\ImaginaryPart}{\mathrm{Im}}$$ $$\newcommand{\Argument}{\mathrm{Arg}}$$ $$\newcommand{\norm}[1]{\| #1 \|}$$ $$\newcommand{\inner}[2]{\langle #1, #2 \rangle}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\id}{\mathrm{id}}$$ $$\newcommand{\Span}{\mathrm{span}}$$ $$\newcommand{\kernel}{\mathrm{null}\,}$$ $$\newcommand{\range}{\mathrm{range}\,}$$ $$\newcommand{\RealPart}{\mathrm{Re}}$$ $$\newcommand{\ImaginaryPart}{\mathrm{Im}}$$ $$\newcommand{\Argument}{\mathrm{Arg}}$$ $$\newcommand{\norm}[1]{\| #1 \|}$$ $$\newcommand{\inner}[2]{\langle #1, #2 \rangle}$$ $$\newcommand{\Span}{\mathrm{span}}$$$$\newcommand{\AA}{\unicode[.8,0]{x212B}}$$

## Overview

In 1999 the Sonoran Desert Conservation Plan was created to help wildlife populations and habitats. As a result of this plan, biologists were able to identify landscapes with wildlife barriers and get funding to install wildlife corridors. On State Route (SR) 77 two wildlife corridors were installed, one overpass and one underpass. These corridors were the first of their kind to be built in the Sonoran Desert so it was difficult to estimate what level of success they would have. As such, a monitoring plan was put in place to document which species used the corridors and how often they used it as time passed since their installation. The figure below illustrates the usage of the wildlife corridors 2+ years after their installation:

## Questions

1. What is the independent (explanatory) variable and the dependent (response) variable?
2. What question(s) are the authors trying to answer with this graph?
3. Does this graph show a positive or negative relationship between the variables? Support your answer by referring to trends observed in the graph.
4. Do you think like the authors are satisfied with the results in the graph? Why?
5. How can we use the results of this graph to inform future wildlife corridor installations?
6. What information/patterns is not clear from this graph?

## Raw Data For Above Graph(s)

Table $$\PageIndex{a}$$: Raw data for total wildlife crossings after installation for overpass and underpass on SR 77. Graph by Rachel Schleiger (CC-BY-NC) modified from data in Santa Catalina - Tortolita Mountain Corridor Progress Report

Month Overpass Underpass
April 0 0
June 150 150
August 249 250
October 296 294
December 600 500
February 750 502
April 1000 600
June 1200 605
August 1800 750
October 1550 950
December 1700 1050
February 2000 1500
April 2400 1850
June 2500 2000
August 2700 2250
October 3000 2500
December 3200 2750