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Papers by Friedrich Barth

Research paper thumbnail of Airflow elicits a spider's jump towards airborne prey. II. Flow characteristics guiding behaviour

Journal of the Royal Society Interface, May 6, 2013

Research paper thumbnail of Food profitability affects intranidal recruitment behaviour in the stingless bee<i>Nannotrigona</i><i>testaceicornis</i>

Research paper thumbnail of A stingless bee marks the feeding site in addition to the scent path (Scaptotrigona aff. depilis)

Research paper thumbnail of 200 Volumes in 90 Years

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Dec 25, 2013

Research paper thumbnail of Vibratory Communication in Stingless Bees (Meliponini): The Challenge of Interpreting the Signals

Animal signals and communication, 2014

ABSTRACT Foragers of several species of stingless bees (Apidae; Meliponini), a group of eusocial ... more ABSTRACT Foragers of several species of stingless bees (Apidae; Meliponini), a group of eusocial bees comprising more than 400 mainly tropical species, produce pulsed thoracic vibrations inside the nest when returning from a successful foraging trip. These vibrations do not provide navigational information on the direction and distance of a food source. Instead, both their occurrence and their temporal pattern correlate with the net gain during a foraging trip. The vibrations are therefore considered important information for potential foragers about the profitability of a food patch. Their repeated presentation lowers the foraging threshold of potential food collectors. The vibrations are considered as an alerting signal, which increases the colony’s foraging activity. So far, nothing is known about how foragers of stingless bees perceive the pulsed thoracic vibrations of the recruiters. Yet, consideration of the corresponding receptors and their thresholds in honeybees suggests three possible pathways for their transmission to the nestmates: (1) the substrate (vibrations), (2) the air (air particle movements), and (3) direct physical contact (tactile stimuli). The corresponding differ significantly. Whereas substrate vibrations will reach receivers up to ten bee lengths away (medium-range transmission), air particle oscillations and direct vibrations can be detected only by bees very close to, or in contact with, the forager (short-range transmission). Thus, depending on the transmission pathway and the recipient’s sensory capacity, the signal generated by thoracic vibrations will have different meanings. Indeed, substrate vibrations attract both food processors and potential foragers to the vibrating bee, whereas air particle oscillations and direct contact vibrations, in addition to important olfactory and gustatory information, may well be used by prospective recruits to evaluate the profitability of the advertised food source. In contrast to the honeybee waggle dance vibrations, there is no indication in stingless bees of an air jet potentially providing directional information.

Research paper thumbnail of Dna Sequence Data Indicates the Polyphyly of the Family Ctenidae (Araneae)

Journal of Arachnology, 1993

Research paper thumbnail of Thoracic vibrations in stingless bees (<i>Melipona seminigra</i>):resonances of the thorax influence vibrations associated with flight but not those associated with sound production

The Journal of Experimental Biology, Mar 1, 2008

Research paper thumbnail of Comparative Neuroscience

Research paper thumbnail of Recruitment in a scent trail laying stingless bee (<i>Scaptotrigona</i>aff.<i>depilis</i>): Changes with reduction but not with increase of the energy gain

Research paper thumbnail of Scent marks left by <i>Nannotrigona testaceicornis</i> at the feeding site: cues rather than signals

Research paper thumbnail of One of the most fascinating stories in biology

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, May 23, 2019

Research paper thumbnail of Remembering Franz Huber (November 20, 1925–April 27, 2017), a pioneer of insect neuroethology

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Oct 30, 2017

Research paper thumbnail of Drop and swing dispersal behavior of a tropical wandering spider: experiments and numerical model

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Sep 1, 1991

ABSTRACT

Research paper thumbnail of Volumetric measurements do not demonstrate that the spider brain ?central body? has a special role in web building

Journal of Morphology, Apr 1, 1991

The results of volumetric measurements led Hanström ('28) to suggest that specialized neuropi... more The results of volumetric measurements led Hanström ('28) to suggest that specialized neuropil in the brain, the so‐called central body (CB), may be of particular importance in the nervous control of web building behavior in spiders. We compared the volumes of the various brain regions in four spider species clearly differing in lifestyle and web building behavior: an orb weaver (Nephila clavipes), a wandering spider (Cupiennius salei), a jumping spider (Phidippus regius), and a bird spider (Ephebopus sp.). Our results obtained in adult animals as well as our observations on the postembryonic development of the brain do not support Hanström's hypothesis. The relative share of the CB in the brain is very similar in all four species (ca. 3.1 to 5.1%). The differentiation of the CB into a clearly demarcated two‐lobed structure does not coincide with the onset of web building behavior in Nephila. The CB of both Nephila and Cupiennius is already clearly recognizable in spiderlings which have not even left the egg sac.

Research paper thumbnail of Model studies on the mechanical significance of grouping in compound spider slit sensilla (Chelicerata, Araneida)

Zoomorphology, Jul 1, 1984

Research paper thumbnail of Lyriform slit sense organs

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Feb 1, 1975

... Friedrich G. Barth* and Peter Pickelmann Zoologisehes Institut der Universit~t Mfinchen, Miin... more ... Friedrich G. Barth* and Peter Pickelmann Zoologisehes Institut der Universit~t Mfinchen, Miinehen, Federal Republic of Germany ... at a number of other behaviorally significant occasions (Barth, 1972; Barth and Libera, 1970; Barth and Seyfarth, 1971; Liesenfeld, 1961; Pringle ...

Research paper thumbnail of THE QUALITY OF VISION IN THE CTENID SPIDER <i>CUPIENNIUS SALEI</i>

The Journal of Experimental Biology, Mar 1, 1992

Research paper thumbnail of Vision in the Ctenid Spider <i>Cupiennius Salei</i>: Spectral Range and Absolute Sensitivity

The Journal of Experimental Biology, Aug 1, 1993

Research paper thumbnail of Lyriform slit sense organ: Thresholds and stimulus amplitude ranges in a multi-unit mechanoreceptor

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, 1978

Spike discharges were recorded separately from the individual slits of a lyriform organ to examin... more Spike discharges were recorded separately from the individual slits of a lyriform organ to examine the physiological significance of the close parallel arrangement of sensory units in lyriform organs of arachnids. The organ studied lies on the posterior aspect of the spider leg tibia. It consists of 7 slits and is stimulated by induced lateral deflection of the metatarsus. According

Research paper thumbnail of Neuroethology of the Spider Vibration Sense

Springer eBooks, 1985

Spiders are not the favorite animals of most people. Despite much irrational antipathy, however, ... more Spiders are not the favorite animals of most people. Despite much irrational antipathy, however, generally one finds admiration for the beauty shown by the regular cartwheel geometry of the orb web and for the swiftness and precision of spiders that are lured and guided to prey by the slightest vibrations.

Research paper thumbnail of Airflow elicits a spider's jump towards airborne prey. II. Flow characteristics guiding behaviour

Journal of the Royal Society Interface, May 6, 2013

Research paper thumbnail of Food profitability affects intranidal recruitment behaviour in the stingless bee<i>Nannotrigona</i><i>testaceicornis</i>

Research paper thumbnail of A stingless bee marks the feeding site in addition to the scent path (Scaptotrigona aff. depilis)

Research paper thumbnail of 200 Volumes in 90 Years

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Dec 25, 2013

Research paper thumbnail of Vibratory Communication in Stingless Bees (Meliponini): The Challenge of Interpreting the Signals

Animal signals and communication, 2014

ABSTRACT Foragers of several species of stingless bees (Apidae; Meliponini), a group of eusocial ... more ABSTRACT Foragers of several species of stingless bees (Apidae; Meliponini), a group of eusocial bees comprising more than 400 mainly tropical species, produce pulsed thoracic vibrations inside the nest when returning from a successful foraging trip. These vibrations do not provide navigational information on the direction and distance of a food source. Instead, both their occurrence and their temporal pattern correlate with the net gain during a foraging trip. The vibrations are therefore considered important information for potential foragers about the profitability of a food patch. Their repeated presentation lowers the foraging threshold of potential food collectors. The vibrations are considered as an alerting signal, which increases the colony’s foraging activity. So far, nothing is known about how foragers of stingless bees perceive the pulsed thoracic vibrations of the recruiters. Yet, consideration of the corresponding receptors and their thresholds in honeybees suggests three possible pathways for their transmission to the nestmates: (1) the substrate (vibrations), (2) the air (air particle movements), and (3) direct physical contact (tactile stimuli). The corresponding differ significantly. Whereas substrate vibrations will reach receivers up to ten bee lengths away (medium-range transmission), air particle oscillations and direct vibrations can be detected only by bees very close to, or in contact with, the forager (short-range transmission). Thus, depending on the transmission pathway and the recipient’s sensory capacity, the signal generated by thoracic vibrations will have different meanings. Indeed, substrate vibrations attract both food processors and potential foragers to the vibrating bee, whereas air particle oscillations and direct contact vibrations, in addition to important olfactory and gustatory information, may well be used by prospective recruits to evaluate the profitability of the advertised food source. In contrast to the honeybee waggle dance vibrations, there is no indication in stingless bees of an air jet potentially providing directional information.

Research paper thumbnail of Dna Sequence Data Indicates the Polyphyly of the Family Ctenidae (Araneae)

Journal of Arachnology, 1993

Research paper thumbnail of Thoracic vibrations in stingless bees (<i>Melipona seminigra</i>):resonances of the thorax influence vibrations associated with flight but not those associated with sound production

The Journal of Experimental Biology, Mar 1, 2008

Research paper thumbnail of Comparative Neuroscience

Research paper thumbnail of Recruitment in a scent trail laying stingless bee (<i>Scaptotrigona</i>aff.<i>depilis</i>): Changes with reduction but not with increase of the energy gain

Research paper thumbnail of Scent marks left by <i>Nannotrigona testaceicornis</i> at the feeding site: cues rather than signals

Research paper thumbnail of One of the most fascinating stories in biology

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, May 23, 2019

Research paper thumbnail of Remembering Franz Huber (November 20, 1925–April 27, 2017), a pioneer of insect neuroethology

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Oct 30, 2017

Research paper thumbnail of Drop and swing dispersal behavior of a tropical wandering spider: experiments and numerical model

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Sep 1, 1991

ABSTRACT

Research paper thumbnail of Volumetric measurements do not demonstrate that the spider brain ?central body? has a special role in web building

Journal of Morphology, Apr 1, 1991

The results of volumetric measurements led Hanström ('28) to suggest that specialized neuropi... more The results of volumetric measurements led Hanström ('28) to suggest that specialized neuropil in the brain, the so‐called central body (CB), may be of particular importance in the nervous control of web building behavior in spiders. We compared the volumes of the various brain regions in four spider species clearly differing in lifestyle and web building behavior: an orb weaver (Nephila clavipes), a wandering spider (Cupiennius salei), a jumping spider (Phidippus regius), and a bird spider (Ephebopus sp.). Our results obtained in adult animals as well as our observations on the postembryonic development of the brain do not support Hanström's hypothesis. The relative share of the CB in the brain is very similar in all four species (ca. 3.1 to 5.1%). The differentiation of the CB into a clearly demarcated two‐lobed structure does not coincide with the onset of web building behavior in Nephila. The CB of both Nephila and Cupiennius is already clearly recognizable in spiderlings which have not even left the egg sac.

Research paper thumbnail of Model studies on the mechanical significance of grouping in compound spider slit sensilla (Chelicerata, Araneida)

Zoomorphology, Jul 1, 1984

Research paper thumbnail of Lyriform slit sense organs

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, Feb 1, 1975

... Friedrich G. Barth* and Peter Pickelmann Zoologisehes Institut der Universit~t Mfinchen, Miin... more ... Friedrich G. Barth* and Peter Pickelmann Zoologisehes Institut der Universit~t Mfinchen, Miinehen, Federal Republic of Germany ... at a number of other behaviorally significant occasions (Barth, 1972; Barth and Libera, 1970; Barth and Seyfarth, 1971; Liesenfeld, 1961; Pringle ...

Research paper thumbnail of THE QUALITY OF VISION IN THE CTENID SPIDER <i>CUPIENNIUS SALEI</i>

The Journal of Experimental Biology, Mar 1, 1992

Research paper thumbnail of Vision in the Ctenid Spider <i>Cupiennius Salei</i>: Spectral Range and Absolute Sensitivity

The Journal of Experimental Biology, Aug 1, 1993

Research paper thumbnail of Lyriform slit sense organ: Thresholds and stimulus amplitude ranges in a multi-unit mechanoreceptor

Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology, 1978

Spike discharges were recorded separately from the individual slits of a lyriform organ to examin... more Spike discharges were recorded separately from the individual slits of a lyriform organ to examine the physiological significance of the close parallel arrangement of sensory units in lyriform organs of arachnids. The organ studied lies on the posterior aspect of the spider leg tibia. It consists of 7 slits and is stimulated by induced lateral deflection of the metatarsus. According

Research paper thumbnail of Neuroethology of the Spider Vibration Sense

Springer eBooks, 1985

Spiders are not the favorite animals of most people. Despite much irrational antipathy, however, ... more Spiders are not the favorite animals of most people. Despite much irrational antipathy, however, generally one finds admiration for the beauty shown by the regular cartwheel geometry of the orb web and for the swiftness and precision of spiders that are lured and guided to prey by the slightest vibrations.