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The Study of the Echolocation Calls of Myotis Macrodactylus in Different River Habitats

Author: WangHongNa
Tutor: FengJiang
School: Northeast Normal University
Course: Environmental Science
Keywords: Big toe Myotis Echolocation Sonic plasticity Terrestrial habitats River habitat
CLC: Q958
Type: Master's thesis
Year: 2010
Downloads: 21
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Abstract

Big toe mouse ear bat (Myotis macrodactylus) is a wing hand mesh (Chiroptera) bats Division mouse ear bat genus (Myotis), for the Chinese new record species, mainly distributed in Japan, Russia, Siberia and North Korea, its echo locate sound waves for FM ( Frequency modulation, FM) type, predation trawl-prey \In 2009, the village in Jilin Province, Ji'an law and order, plasticity and ecological adaptability of river habitats of the big toe Myotis echolocation. Study, the big toe mouse-eared bat activity Rivers Health territory divided 13 types, recording and analysis of different river habitats echolocation sound waves, and compared with the land hygiene throughout the sonic characteristics, combination of various ecological habitat characteristics of depth to explore big toe mouse ear bats echo locate acoustic characteristics and habitat adaptability. The various habitats of the big toe myotis uses frequency modulation type (FM) echolocation calls with 1-2 harmonic acoustic energy is mainly concentrated in the first harmonic. In this study, the big toe myotis peak frequency (54.63 ± 5.10) is higher, the longer the duration of (4.65 ± 1.09), high a starting-frequency (94.39 ± 33.78) the termination of the lower frequency (39.40 ± 4.03), ie bandwidth wider. Geographical differences, differences in habitat and sampling time differences may be caused by the change of its sonic character. Land and river habitats of the big toe Myotis echolocation signal structure. The acoustic parameters significantly different (p lt; 0.05), discriminant accuracy was 66.1%. And similar vegetation openness, the surface characteristics of different relatively open canopy habitats and terrestrial habitats comparison be verified. The river of bat echolocation behavior interfere myotis, big toe by liters of peak frequency, increase bandwidth to obtain the goal of fine information in order to avoid the river interference by shortening the duration of the extension of the pulse interval to avoid sonic overlap. But the acoustic amplitude is not increased. 3 surface physical characteristics affect the structure of the big toe Myotis echolocation signals. Some acoustic parameters smooth, rough rapids characteristics river habitats significant difference. Surface physical structure, especially in rough water, and a significant increase in the complexity of Habitat increase bat Predator difficulty. Vegetation openness, the surface characteristics of three different river habitat is relatively open, the rough surface of the water habitat (CNO5-10) the peak frequency of the highest, the shortest duration, ramp rate, high-frequency helps prey and target information in complex background obtained direct reaction of the water rough habitats big toe Myotis echolocation strategy. Compared with the relative canopy river habitats, open habitat big toe myotis showed sonic characteristics of low-frequency, narrowband, long, smaller tilt rate. Embodies Echolocation plasticity and habitat adaptability. River habitats of the big toe mouse-eared bat echolocation calls of parameters there are some general differences (p lt; 0.05). The surface smoothness of each habitat, with increasing habitats OPENNESS the big toe myotis acoustic frequency and bandwidth gradually decreased gradually lengthened, pulse duration, wave type gently. In the jet stream habitat between the big toe Myotis echolocation calls showed similar changes regularly. The rough surface of the water each habitat acoustic parameters regularity is not obvious. We believe that the smooth river habitat over water enough to open the two sides had no effect on the vegetation of its sonic structure. Myotis, big toe Echolocation structural adjustment and river habitat characteristics compatible. In summary, the big toe rivers myotis different habitats Echolocation structure there are some differences, and the land and river habitats acoustic significantly different. The physical structure of the river water surface to some extent affected the structure of echolocation calls, the big toe Myotis echolocation calls of phenotypic plasticity and adaptability of habitat. Sonic plasticity characteristics of the big toe mouse-eared bat the complex predatory activity is essential habitats, is the result of the interaction of the bat sound environmental characteristics, and decided to bat habitats degree of resource utilization.

The Study of the Echolocation Calls of Myotis Macrodactylus in Different River Habitats

Abstract

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