You are part of a group of researchers examining the survivorship and fecundity of Bengal Tigers (Panthera tigris tigris) in the Kalakkad Mundanthurai Tiger Reserve in the South Indian state of Tamil Nadu. Parts of the reserve are well-protected from poaching, and other parts are largely unprotected. Over a period of several years, you’ve gathered demographic data (summarized below) on tigers in both poached and unpoached locations; assume that mx numbers represent female offspring born per female. Note that your demographic data begins at age 1, and does not include survivorship of cubs from birth to age 1. Also, note that Sx is listed here -- this is related to, but is NOT the same as lx… To calculate r, use the formula r = ln(Ro)/T. Including unpoached poaching Tiger age (x) Sx Sx Mx 0 1 1 0 1 0 2 0.83 0.69 0.04 3 0.91 0.65 0.64 4 0.9 0.62 0.78 5 0.85 0.6 0.71 6 0.76 0.58 0.77 7 0.73 0.58 0.77 8 0.61 0.58 0.77 9 0 0 0 What is the long-term prospect of this population of Bengal Tigers if poaching is allowed to persist? Explain your answer.
You are part of a group of researchers examining the survivorship and fecundity of Bengal Tigers (Panthera tigris tigris) in the Kalakkad Mundanthurai Tiger Reserve in the South Indian state of Tamil Nadu. Parts of the reserve are well-protected from poaching, and other parts are largely unprotected. Over a period of several years, you’ve gathered demographic data (summarized below) on tigers in both poached and unpoached locations; assume that mx numbers represent female offspring born per female. Note that your demographic data begins at age 1, and does not include survivorship of cubs from birth to age 1. Also, note that Sx is listed here -- this is related to, but is NOT the same as lx… To calculate r, use the formula r = ln(Ro)/T.
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Including |
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unpoached |
poaching |
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Tiger age (x) |
Sx |
Sx |
Mx |
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0 |
1 |
1 |
0 |
|
1 |
|
|
0 |
|
2 |
0.83 |
0.69 |
0.04 |
|
3 |
0.91 |
0.65 |
0.64 |
|
4 |
0.9 |
0.62 |
0.78 |
|
5 |
0.85 |
0.6 |
0.71 |
|
6 |
0.76 |
0.58 |
0.77 |
|
7 |
0.73 |
0.58 |
0.77 |
|
8 |
0.61 |
0.58 |
0.77 |
|
9 |
0 |
0 |
0 |
What is the long-term prospect of this population of Bengal Tigers if poaching is allowed to persist? Explain your answer.
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