Name. Compare the bones found in the foot, as well as the number of digits.
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1 MAMMALOGY LAB 4 LIMBS & LOCOMOTION Today s exercise focuses on the variation in limbs and lifestyles of mammals. You will be interpreting the lifestyles of a number of mammals based on various aspects of their body design as well as measuring and comparing the limbs of a wide variety of mammal skeletons. For some of the questions it will be helpful to consult Chapter 5 of your lecture text. 1) Examine the limbs of the human, cat, and horse. Compare them with respect to the relative length and width of major forelimb bones (humerus, radius, & ulna) and major hindlimb bones (femur, tibia & fibula). Be sure to give the measurements for each as well as your rankings. Compare the bones found in the foot, as well as the number of digits. 2) How do you explain the seasonal differences in external morphology of the foot of the arctic lemming (Dicrostonyx spp.) in the diagram on display. 3) How are the feet of the arctic fox (Alopex lagopus) modified for life in the snow? 1
2 4) Examine the claws of the mountain lion (Felis concolor), black bear (Ursus americanus), and polar bear on display. How does the curvature of the polar bear's claw differ from those of the mountain lion and black bear? What are two possible reasons for this difference? (Hint: see fig in the lecture text for part of the answer) 5) Examine the photographs of the badger (Taxidea taxus). What adaptations to a semi-fossorial lifestyle are evident? 6) Examine the photographs of the beaver (Castor canadensis) and South American river otter (Lutra lutra). What adaptations to a semi-aquatic lifestyle are apparent in these two species? 2
3 7) Examine the photograph of the beluga whale (Delphinapterus leucas). How do its adaptations to an aquatic lifestyle differ from those of a semi-aquatic mammal such as the California sea lion (Zalophus californicus)? 8) What adaptations to a semi-aquatic lifestyle are seen in the photographs of the platypus (Ornithorhynchus anatinus) provided? 9) What adaptations to a semi-aquatic lifestyle are seen in the picture of a harp seal (Pagophilus groenlandicus) provided? 10) How do you explan the unusual pelage seen in the photograph of the naked mole rat (Heterocephalus glaber)? 11) What adaptations for a fossorial lifestyle are evident in the mole (Scalopus aquaticus)? 3
4 Adaptations for Flight 12) How does the skeletal structure of the bat wing differ from the wing of a bird? 13) How do the facial structures of microchiropteran and megachiropteran bats differ? How do these differences relate to differences in feeding ecology? Jumping vs. Ricocheting 14) The locomotory patterns of hares (Lepus spp.) and kangaroos (e.g. Macropus giganteus) are both described as saltatorial, yet their modes of locomotion are very dissimilar. How do they differ? What anatomical differences account for this? 4
5 Adaptations to Large Body Size 15) Study the limb structure of the elephant (Elaphus or Loxodonta spp.) using the diagrams provided in lab and on page 43 of your lab manual (fig 7-6). Is this a digitgrade, plantigrade, or unguligrade limb plan? Does the elephant limb show any differences in limb anatomy or configuration from other mammals that share this limb plan? 5
6 Lab 4 - Limbs & Locomotion Take Home Worksheet Fill in the table below with measurements from skeletons or diagrams. Calculate the ratios listed and answer the questions at the end. Be sure to read the questions carefully. BE SURE TO SPECIFY THE UNITS IN WHICH YOU MEASURE!!! (Failure to do so will = lost points!) Skeleton Rabbit Frog Human Cat Bat Chimpanzee Horse Mole Forelimb mm mm (1) humerus (2) radius/ulna (3) carpals (4) metacarpals (5) phlanges Hindlimb (6) femur (7) tibia/fibula (8) tarsals (9) metatarsals (10) phlanges Forelimb Ratios relative to humerus (1) humerus [(1)/(1)] radius/ulna [(2)/(1)] c+m+p [(3+4+5)/(1)] Hindlimb ratios (relative to femur) femur [(6)/(6)] tibia/fibula [(7)/(6)] t+m+p [(8+9+10)/(6)] Forelimb to Hindlimb ratio ( )/( ) 6
7 1) The chimpanzee and human are both primates with somewhat similar hindlimb ratios, but very different forelimb ratios, why? 2) Compare the forelimb ratios of the frog and the rabbit. Why are the forelimb ratios so different? How similar are the other ratios? 3) How does the bat's mode of locomotion affect the values of its forelimb ratios? Does it have the same effect on its hindlimb ratios? 4) Why is the forelimb to hindlimb ratio different for a leaper versus a runner/walker? 5) Why is the forelimb to hindlimb ratio different for a flyer versus a brachiator? 7
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