7. Survivorship to maturity and reproduction were tracked for every individual b

Question

7. Survivorship to maturity and reproduction were tracked for every individual bom in 2001. Each brds beak depth was measured at matrity and compared to the population mean when it was born Since 2001 had below erage ranfall, biologists predcted larger beaks (beak depth mean) should have higher fithess. This is confirmed, the Re (net reproductive rate) for larger beaks is 1.051 and for smaller beaks is 0 589 They also tested it this was due to higher survivorship, higher reprodaction or both These were lewed using ehsquare tests for survivorship, and reproduction with the following results survivorship ×2·0627 and p . 0 4264 and reproduction X72.753 and p 0 0971 Survivorship to maturity of 91 finches bom in 2001 beak depth beak depth survive to matunity die before madurity 35 18 16 Reproduction of 50 finches who survived to maturity produce offapringno beak depth 24 mean beak depth 13 From this you would conclude: a) smaller beaks have higher survivorship to maturity, but it is not significantly higher. b) larger beaks have significantly higher survivorship to maturity c) smaller beaks are significantly less likely to reproduce after reaching maturity. d) larger beaks are more likely to reproduce after reaching maturity, but are not significantly more likely. e t

Explanation / Answer

according to the chi-square values for survival depends on the beak length

and reproduction dependence of beak length

survivorship chi-square = 0.627 , p-value =0.4284

the degree of freedom is 1 as the formula is (no. of row -1)*(no.of column -1)

according to the chi-square chart p>0.20<0.975 therefore, there is no significant dependence of survivorship on beak length.

for reproduction dependence on beak length chi-square = 2.753 , p-value = 0.0971

according to the chi-square chart p>0.05<0.1 therefore, there is no significant dependence of reproduction on beak length.

and also larger beak have the higher reproduction rate

therefore, option D is correct.

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