The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Raymond Leborgne - One of the best experts on this subject based on the ideXlab platform.
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does Building Activity influence web construction and web characteristics in the orb web spider zygiella x notata araneae araneidae
Zoological Studies, 2014Co-Authors: Alain Pasquet, Julia Marchal, Mylène Anotaux, Raymond LeborgneAbstract:Very few studies have investigated the influence of regular practice of a stereotyped behaviour on its future expression. In spiders, orb-web construction is a succession of repetitive and stereotyped behaviours and is a relevant model for such study. This study examined if preventing spiders from Building influences their future constructions. Spiders were caught in the field and brought back to the laboratory where they were exposed to two different situations; half were maintained in small boxes where web Building was not possible, and half were maintained in large enclosures where they could build orb-webs. All spiders were tested twice: 1 week after their capture (test 1) and 12 weeks later (test 2). Their Building performance was evaluated by examining silk investment (length of the capture spiral, number of radii, of spiral turns, length of the lower part of the web), web design (mesh height, asymmetry) and the frequency of anomalies in the web. There was no difference in web constructions between the two groups in either test. However, the rearing conditions seemed to affect two parameters: the length of the lower part of the web and the asymmetry were higher for spiders reared in small boxes. We did find also, an overall decrease with time in silk investment (length of the capture spiral, capture area) in both groups as well as an increase in the number of anomalies of the capture spiral from tests 1 to 2. These results suggest that regular web construction does not have a strong effect on web structure or silk investment, but spider age did affect parameters in the two groups. Thus, the lack of practice over a large portion of a spider's adult life does not affect a stereotyped behaviour such as the Building of an orb-web.
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Does Building Activity influence web construction and web characteristics in the orb-web spider Zygiella x-notata (Araneae, Araneidae)?
Zoological Studies, 2014Co-Authors: Alain Pasquet, Julia Marchal, Mylène Anotaux, Raymond LeborgneAbstract:Background: Very few studies have investigated the influence of regular practice of a stereotyped behaviour on its future expression. In spiders, orb-web construction is a succession of repetitive and stereotyped behaviours and is a relevant model for such study. This study examined if preventing spiders from Building influences their future constructions. Spiders were caught in the field and brought back to the laboratory where they were exposed to two different situations; half were maintained in small boxes where web Building was not possible, and half were maintained in large enclosures where they could build orb-webs. All spiders were tested twice: 1 week after their capture (test 1) and 12 weeks later (test 2). Their Building performance was evaluated by examining silk investment (length of the capture spiral, number of radii, of spiral turns, length of the lower part of the web), web design (mesh height, asymmetry) and the frequency of anomalies in the web. Results: There was no difference in web constructions between the two groups in either test. However, the rearing conditions seemed to affect two parameters: the length of the lower part of the web and the asymmetry were higher for spiders reared in small boxes. We did find also, an overall decrease with time in silk investment (length of the capture spiral, capture area) in both groups as well as an increase in the number of anomalies of the capture spiral from tests 1 to 2. Conclusions: These results suggest that regular web construction does not have a strong effect on web structure or silk investment, but spider age did affect parameters in the two groups. Thus, the lack of practice over a large portion of a spider's adult life does not affect a stereotyped behaviour such as the Building of an orb-web.
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body mass dependent cost of web Building behavior in an orb weaving spider zygiella x notata
Naturwissenschaften, 2003Co-Authors: Samuel Venner, Alain Pasquet, Marieclaude Belvenner, Raymond LeborgneAbstract:In numerous spider species, reproductive success of adult females has been shown to be positively correlated with their body mass. We suggest, however, that spiders may incur greater foraging costs as their body mass increases due to the numerous and complex locomotor bouts needed to build an orb-web. Such a body-mass-dependent cost should, in turn, affect the web-Building decisions of spiders. In the laboratory, we tested the influence of body mass on energetic expenditure (measured as mass loss) during web-Building behavior in Zygiella x-notata. Our results showed (1) that energetic costs associated with web-Building were closely related to body mass and to web-Building Activity, and (2) that as their body mass increased, spiders reduced the amount of silk used per web, while their foraging effort simultaneously increased. This work gives new insights into web-Building behavior and energy allocation strategies of weaving spiders.
Alain Pasquet - One of the best experts on this subject based on the ideXlab platform.
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does Building Activity influence web construction and web characteristics in the orb web spider zygiella x notata araneae araneidae
Zoological Studies, 2014Co-Authors: Alain Pasquet, Julia Marchal, Mylène Anotaux, Raymond LeborgneAbstract:Very few studies have investigated the influence of regular practice of a stereotyped behaviour on its future expression. In spiders, orb-web construction is a succession of repetitive and stereotyped behaviours and is a relevant model for such study. This study examined if preventing spiders from Building influences their future constructions. Spiders were caught in the field and brought back to the laboratory where they were exposed to two different situations; half were maintained in small boxes where web Building was not possible, and half were maintained in large enclosures where they could build orb-webs. All spiders were tested twice: 1 week after their capture (test 1) and 12 weeks later (test 2). Their Building performance was evaluated by examining silk investment (length of the capture spiral, number of radii, of spiral turns, length of the lower part of the web), web design (mesh height, asymmetry) and the frequency of anomalies in the web. There was no difference in web constructions between the two groups in either test. However, the rearing conditions seemed to affect two parameters: the length of the lower part of the web and the asymmetry were higher for spiders reared in small boxes. We did find also, an overall decrease with time in silk investment (length of the capture spiral, capture area) in both groups as well as an increase in the number of anomalies of the capture spiral from tests 1 to 2. These results suggest that regular web construction does not have a strong effect on web structure or silk investment, but spider age did affect parameters in the two groups. Thus, the lack of practice over a large portion of a spider's adult life does not affect a stereotyped behaviour such as the Building of an orb-web.
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Does Building Activity influence web construction and web characteristics in the orb-web spider Zygiella x-notata (Araneae, Araneidae)?
Zoological Studies, 2014Co-Authors: Alain Pasquet, Julia Marchal, Mylène Anotaux, Raymond LeborgneAbstract:Background: Very few studies have investigated the influence of regular practice of a stereotyped behaviour on its future expression. In spiders, orb-web construction is a succession of repetitive and stereotyped behaviours and is a relevant model for such study. This study examined if preventing spiders from Building influences their future constructions. Spiders were caught in the field and brought back to the laboratory where they were exposed to two different situations; half were maintained in small boxes where web Building was not possible, and half were maintained in large enclosures where they could build orb-webs. All spiders were tested twice: 1 week after their capture (test 1) and 12 weeks later (test 2). Their Building performance was evaluated by examining silk investment (length of the capture spiral, number of radii, of spiral turns, length of the lower part of the web), web design (mesh height, asymmetry) and the frequency of anomalies in the web. Results: There was no difference in web constructions between the two groups in either test. However, the rearing conditions seemed to affect two parameters: the length of the lower part of the web and the asymmetry were higher for spiders reared in small boxes. We did find also, an overall decrease with time in silk investment (length of the capture spiral, capture area) in both groups as well as an increase in the number of anomalies of the capture spiral from tests 1 to 2. Conclusions: These results suggest that regular web construction does not have a strong effect on web structure or silk investment, but spider age did affect parameters in the two groups. Thus, the lack of practice over a large portion of a spider's adult life does not affect a stereotyped behaviour such as the Building of an orb-web.
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body mass dependent cost of web Building behavior in an orb weaving spider zygiella x notata
Naturwissenschaften, 2003Co-Authors: Samuel Venner, Alain Pasquet, Marieclaude Belvenner, Raymond LeborgneAbstract:In numerous spider species, reproductive success of adult females has been shown to be positively correlated with their body mass. We suggest, however, that spiders may incur greater foraging costs as their body mass increases due to the numerous and complex locomotor bouts needed to build an orb-web. Such a body-mass-dependent cost should, in turn, affect the web-Building decisions of spiders. In the laboratory, we tested the influence of body mass on energetic expenditure (measured as mass loss) during web-Building behavior in Zygiella x-notata. Our results showed (1) that energetic costs associated with web-Building were closely related to body mass and to web-Building Activity, and (2) that as their body mass increased, spiders reduced the amount of silk used per web, while their foraging effort simultaneously increased. This work gives new insights into web-Building behavior and energy allocation strategies of weaving spiders.
Samuel Venner - One of the best experts on this subject based on the ideXlab platform.
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body mass dependent cost of web Building behavior in an orb weaving spider zygiella x notata
Naturwissenschaften, 2003Co-Authors: Samuel Venner, Alain Pasquet, Marieclaude Belvenner, Raymond LeborgneAbstract:In numerous spider species, reproductive success of adult females has been shown to be positively correlated with their body mass. We suggest, however, that spiders may incur greater foraging costs as their body mass increases due to the numerous and complex locomotor bouts needed to build an orb-web. Such a body-mass-dependent cost should, in turn, affect the web-Building decisions of spiders. In the laboratory, we tested the influence of body mass on energetic expenditure (measured as mass loss) during web-Building behavior in Zygiella x-notata. Our results showed (1) that energetic costs associated with web-Building were closely related to body mass and to web-Building Activity, and (2) that as their body mass increased, spiders reduced the amount of silk used per web, while their foraging effort simultaneously increased. This work gives new insights into web-Building behavior and energy allocation strategies of weaving spiders.
Palm Daniel - One of the best experts on this subject based on the ideXlab platform.
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A seismic monitoring approach to detect and quantify river sediment mobilization by steelhead redd-Building Activity
2020Co-Authors: Dietze Michael, Losee James, Polvi Lina, Palm DanielAbstract:The role of spawning salmonids in altering river bed morphology and sediment transport is significant, yet poorly understood. This is due, in large part, to limitations in monitoring the redd-Building process in a continuous and spatially extended way. A complementary approach may be provided through the use of a small seismic sensor network analysing the ground motion signals generated by the agitation of sediment during the redd-Building process. We successfully tested the viability of this approach by detecting and locating artificially generated redd signals in a reach of the Mashel River, Washington State, USA. We then utilize records of 17 seismic stations, in which we automatically detected seismic events that were subsequently manually checked, yielding a catalogue of 45 potential redd-Building events. Such redd-Building events typically lasted between 1 and 20 min and consisted of a series of clusters of 50-100 short energetic pulses in the 20-60 Hz frequency range. The majority (>90%) of these redd-Building events occurred within 11 days, predominantly during the early morning and late afternoon. The seismically derived locations of the signals were in agreement with independently mapped redds. Improved network geometry and installation conditions are required for more efficient detection, robust location and improved energetic insights into redd-Building processes in larger reaches. The passive and continuous nature of the seismic approach in detecting redds and describing fish behaviour provides a novel tool for fish biologists and fisheries managers, but also for fluvial geomorphologists, interested in quantifying the amount of sediment mobilized by this ecosystem engineer. When complemented with classic approaches, it could allow for a more holistic picture of the kinetics and temporal patterns (at scales from seconds to multiple seasons) of a key phase of salmonid life cycles. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Lt
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A seismic monitoring approach to detect and quantify river sediment mobilization by steelhead redd-Building Activity
'Wiley', 2020Co-Authors: Dietze Michael, Losee James, Polvi Lina, Palm DanielAbstract:The role of spawning salmonids in altering river bed morphology and sediment transport is significant, yet poorly understood. This is due, in large part, to limitations in monitoring the redd‐Building process in a continuous and spatially extended way. A complementary approach may be provided through the use of a small seismic sensor network analysing the ground motion signals generated by the agitation of sediment during the redd‐Building process. We successfully tested the viability of this approach by detecting and locating artificially generated redd signals in a reach of the Mashel River, Washington State, USA. We then utilize records of 17 seismic stations, in which we automatically detected seismic events that were subsequently manually checked, yielding a catalogue of 45 potential redd‐Building events. Such redd‐Building events typically lasted between 1 and 20 min and consisted of a series of clusters of 50–100 short energetic pulses in the 20–60 Hz frequency range. The majority (>90%) of these redd‐Building events occurred within 11 days, predominantly during the early morning and late afternoon. The seismically derived locations of the signals were in agreement with independently mapped redds. Improved network geometry and installation conditions are required for more efficient detection, robust location and improved energetic insights into redd‐Building processes in larger reaches. The passive and continuous nature of the seismic approach in detecting redds and describing fish behaviour provides a novel tool for fish biologists and fisheries managers, but also for fluvial geomorphologists, interested in quantifying the amount of sediment mobilized by this ecosystem engineer. When complemented with classic approaches, it could allow for a more holistic picture of the kinetics and temporal patterns (at scales from seconds to multiple seasons) of a key phase of salmonid life cycles
Chunli Liu - One of the best experts on this subject based on the ideXlab platform.
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Nest-Building Activity as a reproducible and long-term stroke deficit test in a mouse model of stroke.
Brain and behavior, 2018Co-Authors: Dong Yuan, Chunli LiuAbstract:Introduction Neuroprotective therapeutics achieved from animal studies have not been able to translate into clinical stroke therapies. A major reason may be that the functional tests and outcomes between animal stroke studies and clinical trials are significantly different. Ultimately, functional recovery is most important for stroke patients, but it remains challenging to identify animal functional tests that reflect human stroke deficits. This study aimed to explore whether the nest-Building Activity can be used as a functional test of mouse stroke deficit. Methods Forty-one C57B6 male mice were randomly assigned into a sham-operated control group and 20-, 40- and 60-min middle cerebral artery occlusion (MCAO) groups. Mice were perfusion-fixed at 21 days following sham surgery or MCAO. Infarct volumes were assessed under the light microscopy. The nest-Building Activity was characterized and quantitatively evaluated. Results The results show that only a small portion of striatum was damaged after 20-min MCAO. The brain damage areas were expanded from striatum to the neocortex and hippocampus proportionally after 40-min and 60-min MCAO, respectively. Consistently, relative to that of the sham-operated mice, the nest-Building Activity was insignificantly altered after 20-min MCAO, but dramatically and significantly reduced proportionally following 40-min and 60-min MCAO, respectively. The nest-Building deficit was a long-lasting event and could be seen for as long as 14-21 days of recovery, the longest endpoint of this study. Conclusions The results suggest that the nest-Building Activity may be a novel, objective, easy to use, highly sensitive, and long-lasting test that may reflect the multifaceted sensorimotor and cognitive deficits after stroke in humans. Our findings may provide a novel multifaceted test for bridging the gap between animal stroke studies and clinical trials.
