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Titolo:
PREY DETECTION IN TRAWLING INSECTIVOROUS BATS - DUCKWEED AFFECTS HUNTING BEHAVIOR IN DAUBENTONS BAT, MYOTIS-DAUBENTONII
Autore:
BOONMAN AM; BOONMAN M; BRETSCHNEIDER F; VANDEGRIND WA;
Indirizzi:
UNIV BRISTOL,SCH BIOL SCI,WOODLAND RD BRISTOL BS8 1UG AVON ENGLAND UNIV UTRECHT,DEPT COMPARAT PHYSIOL NL-3584 CH UTRECHT NETHERLANDS
Titolo Testata:
Behavioral ecology and sociobiology
fascicolo: 2, volume: 44, anno: 1998,
pagine: 99 - 107
SICI:
0340-5443(1998)44:2<99:PDITIB>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLIGHT PERFORMANCE; ECHOLOCATING BATS; NYCTALUS-LEISLERI; FORAGING TACTICS; CHIROPTERA; VESPERTILIONIDAE; DISCRIMINATION; INFORMATION; WATER;
Keywords:
ECHOLOCATION; DUCKWEED; PREY DISCRIMINATION; VESPERTILIONIDAE; LEMNACEAE; BATS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Boonman et al., "PREY DETECTION IN TRAWLING INSECTIVOROUS BATS - DUCKWEED AFFECTS HUNTING BEHAVIOR IN DAUBENTONS BAT, MYOTIS-DAUBENTONII", Behavioral ecology and sociobiology, 44(2), 1998, pp. 99-107

Abstract

Daubenton's bat, a trawling vespertilionid bat species, hunts for insects that fly close to, or rest on, the water surface. During summer, many ponds at which Daubenton's bats hunt become gradually covered with duckweed. The purpose of this study was to investigate the effects of duckweed cover on the hunting behaviour of Daubenton's bats and on the ultrasound-reflecting properties of the water surface. Our study revealed the following. (1) Daubenton's bat avoids water surfaces covered with duckweed. (2) Prey abundance was related to the number of foraging Daubenton's bats but was independent of duckweed cover. (3) When mealworms were presented among standardized amounts of duckweed to naturally foraging Daubenton's bats, they caught significantly less mealworms when the duckweed cover was increased. (4) Measurements with ultrasonic signals show that a water surface covered with duckweed returns a much stronger background echo at small angles (i.e. parallel to the water surface) compared to an uncovered water surface. It seems likelythat a cover of duckweed on the water surface interferes with prey detection by masking the echoes returning from prey. (5) It was relatively difficult for the bats to discriminate small patches of duckweed from mealworms. The proposed discrimination mechanism for this trawling bat species suggests that single duckweed patches can also be mistakenfor natural prey by Daubenton's bats.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 04:23:04