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Dying without wings Natalie Cooper Trinity College 23.

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Presentation on theme: "Dying without wings Natalie Cooper Trinity College 23."— Presentation transcript:

1 Dying without wings Natalie Cooper Trinity College 23

2 Kevin

3 …in this world nothing can be said to be certain, except death and taxes… Benjamin lin

4 There is great variation in the lifespans of living things…

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7 How can we explain this variation?

8 Body Mass…

9 log(Lifespan) = log(a) +blog(Body mass)

10 log (Lifespan) log(Body mass) log(a) b

11 log (Lifespan) log(Body mass)

12 log (Lifespan) log(Body mass)

13 log (Lifespan) log(Body mass)

14 log (Lifespan) log(Body mass)

15 Why do some species live longer than expected given their body size?

16 A quick side step into life history theory…

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24 Why do species have different life history strategies?

25 Variations in extrinsic mortality…

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36 Species with adaptations that reduce extrinsic mortality should have longer lifespans than expected given their body mass

37 How can species reduce their extrinsic mortality?

38 Flight?

39 log (Lifespan) log(Body mass)

40 log (Lifespan) log(Body mass)

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42 Activity period?

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44 Foraging environment?

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46 Burrowing?

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48 We tested our predictions on 779 mammals and 546 birds (N = 1325)

49 Body Mass…

50 log (Lifespan) log(Body mass)

51 log (Lifespan) log(Body mass)

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53 Activity period? Foraging Environment?

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55 Crepuscular species have the shortest lifespans

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57 Foraging Environment? Activity period? Burrowing?

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60 Arboreal, semi- arboreal and fossorial species have the longest lifespans

61 When you’re active Where you’re active

62 Are bats really exceptional?

63 log (Lifespan) log(Body mass)

64 log (Lifespan) log(Body mass)

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67 Be active at day or night Forage in safety Be big Fly Live in a burrow


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