Vision in echolocating bats - Fladdermus.net

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Fig. 1. – The device used for the optomotor response tests, in which a bat is presented with rotating, striped patterns of different fineness. The bat responds to the revolving patterns by moving its head in a stereotype manner. The thickness of the stripes corresponds to the bats visual resolving power (acuity), measured as degrees (or minutes) of arc (illustrated by Olof Helje). 89
Tab. 1. – Eye diameter and optomotor responses to patterns of different fineness in four species of insectivorous bats. The asterisks indicate that the 5 o pattern was not tested and that the bat did not respond to finer patterns. Ambient Eye diameter Minimum Species Ind. light (lux) (mm) separable angle Plecotus auritus 1 0.6 1.6 45’ 2 0.6 1.8 2.5° 3 0.6 not measured 1° 4 0.1 1.7 1° 5 0.1 1.7 45’ 6 0.7 not measured 30’ 7 0.2 not measured 45’ 8 0.3 not measured 1° Myotis mystacinus 1 0.6 1.0 no response* 2 0.6 0.9 no response* 3 0.1 not measured 5° Myotis brandtii 1 0.1 not measured 5° 2 0.1 not measured 5° Myotis daubentoni 1 0.1 1.2 5° 2 0.1 1.3 no response 3 0.3 not measured 5° 90
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Vision in echolocating bats Johan E
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A doctoral thesis at a university i
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to be precedence of vision over son
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och för att undvika hinder på vä
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B ats (Order: Chiroptera) are among
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VISION IN ECHOLOCATING BATS The mic
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The microchiropteran eyes are shape
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structures, and the dorsal lateral
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10 lux, which is equivalent to the
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The device used for the optomotor r
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Tab 2 - cont Light Visual Species (
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jamaicensis, Desmodus rotundus and
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(Davis & Barbour 1965) or when they
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Insectivores and carnivores For bat
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Moreover, the eyes of Macrotus cali
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combined with broadband echolocatio
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Multimodality - vision and echoloca
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superior colliculus. It has been sh
Page 39 and 40: Acknowledgements First of all I wou
Page 41 and 42: Buchler, E. R. & Wasilewski, P. J.
Page 43 and 44: Heffner, R. S. 1997. Comparative st
Page 45 and 46: Masterson, F. A. & Ellins, S. R. 19
Page 47: Suthers, R. A. & Chase, J. 1966. Vi
Page 51 and 52: Animal Behaviour - In Press Use of
Page 53 and 54: the ability of brown long eared bat
Page 55 and 56: General observations RESULTS When r
Page 57 and 58: are influenced to some extent by th
Page 59 and 60: Eklöf, J., Tranefors, T. & Vazquez
Page 61 and 62: Table 1. - The number of feeding at
Page 63: “The Eocene brought mammals mean
Page 73 and 74: Submitted manuscript Vision complem
Page 75 and 76: (dorsal) side up and the other had
Page 77 and 78: (Anderson et al. 1998). Hence, the
Page 79: Figure 1. - Frequency of attacks by
Page 83 and 84: Manuscript Visual acuity and eye si
Page 85 and 86: computer screen. The bats were rele
Page 87 and 88: study. On overcast nights the amoun
Page 89: Koay, G., Kearns, D., Heffner, H. E
Page 93: “The bat that flits at close of E
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