scholarly journals Collective aggressiveness limits colony persistence in high‐ but not low‐elevation sites at Amazonian social spiders

2019 ◽  
Vol 32 (12) ◽  
pp. 1362-1367 ◽  
Author(s):  
James L. L. Lichtenstein ◽  
David N. Fisher ◽  
Brendan L. McEwen ◽  
Daniel T. Nondorf ◽  
Esteban Calvache ◽  
...  
Keyword(s):  
Social Spiders

The Life-History of Badumna-Candida (Araneae, Amaurobioidea)

1993 ◽  
Vol 41 (5) ◽  
pp. 441 ◽  
Author(s):  
MF Downes
Keyword(s):  
Sex Ratio ◽  
Egg Production ◽  
Production Cycle ◽  
Social Spider ◽  
Social Spiders ◽  
Primary Sex Ratio ◽  
The Social ◽  
The Status ◽  
History Of ◽  
Changes Over Time

A two-year study of the social spider Badumna candida at Townsville, Queensland, provided information on colony size and changes over time, maturation synchrony, temperature effects on development, sex ratio, dispersal, colony foundation, fecundity and oviposition. Key findings were that B. candida outbred, had an iteroparous egg-production cycle between March and October, had an even primary sex ratio and achieved maturation synchrony by retarding the development of males, which matured faster than females at constant temperature. There was no overlap of generations, the cohort of young from a nest founded by a solitary female in summer dispersing the following summer as subadults (females) or subadults and adults (males). These findings confirm the status of B. candida as a periodic-social spider (an annual outbreeder), in contrast to the few known permanent-social spider species whose generations overlap. Cannibalism, normally rare in social spiders, rose to 48% when spiders were reared at a high temperature. This may be evidence that volatile recognition pheromones suppress predatory instincts in social spiders.

scholarly journals ENHANCED SPIDER ALGORITHM FOR MINIMIZATION OF REAL POWER LOSS

2018 ◽  
Vol 6 (4) ◽  
pp. 301-311
Author(s):  
K. Lenin
Keyword(s):  
Power Loss ◽  
Reactive Power ◽  
High Quality ◽  
Quality Performance ◽  
Real Power ◽  
Social Spiders ◽  
The Real ◽  
Spider Web ◽  
Simulation Results ◽  
Power Problem

In this paper Enhanced Spider (ES) algorithm is proposed to solve reactive power Problem. Enthused by the spiders, a new Enhanced Spider (ES) algorithm is utilized to solve reactive power problem. The composition is primarily based on the foraging approach of social spiders, which make use of of the vibrations spread over the spider web to choose the position of prey. The simulation results demonstrate high-quality performance of Enhanced Spider (ES) algorithm in solving reactive power problem.  The projected Enhanced Spider (ES) algorithm has been tested in standard IEEE 57,118 bus systems and compared to other reported standard algorithms. Results show that Enhanced Spider (ES) algorithm is more efficient than other algorithms in reducing the real power loss.

Social spiders and hybrid webs at Studio Tomás Saraceno

2016 ◽  
Vol 24 (1) ◽  
pp. 161-169 ◽  
Author(s):  
Sasha Engelmann
Keyword(s):  
Specific Production ◽  
Social Spiders ◽  
Visual Material ◽  
Social Encounter ◽  
Species Specific

A spider’s web is the species-specific production of spacetime; it is an aesthetic as well as an evolutionary, metabolic and climatic achievement. As part of a long-term engagement with spiders and their webs, the artist Tomás Saraceno has collaborated with populations of spiders and other creatures to produce hybrid webs. The processual and patterned production of hybrid webs at Studio Tomás Saraceno inspires thought on the axes of more-than-human sympoeisis, on collaboration between and across multitudes of creatures, and on a spectrum of social and semi-social encounter between different species. Through interviews, storytelling, visual material and critical description, this paper develops a notion of hybrid webs as philosophical-aesthetic propositions for multispecies sociality.

scholarly journals Collective behavior and colony persistence of social spiders depends on their physical environment

2018 ◽  
Vol 30 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Ambika Kamath ◽  
Skylar D Primavera ◽  
Colin M Wright ◽  
Grant N Doering ◽  
Kirsten A Sheehy ◽  
...  
Keyword(s):  
Collective Behavior ◽  
Physical Environment ◽  
Social Spiders

When and why do sit-and-wait social spiders disperse?

2019 ◽  
Vol 66 (1-2) ◽  
pp. 15-25
Author(s):  
Bharat Parthasarathy ◽  
Hema Somanathan
Keyword(s):  
Information Transfer ◽  
Spatial Scales ◽  
Structured Populations ◽  
Social Spiders ◽  
Intrinsic Factors ◽  
Area Of Interest ◽  
Evolution Of Sociality ◽  
Dispersal Distances ◽  
Complex Relationships ◽  
Living Organisms

Abstract Dispersal is inherent to all living organisms. Sit-and-wait predators such as social spiders, with their sedentary lifestyles, present an intriguing and underexplored case to examine the proximate and ultimate reasons for dispersal. Though a reduction in dispersal tendencies must accompany the evolution of sociality in spiders, a fraction of the colony may disperse in groups or individually in many species. Such group or solitary dispersal by female social spiders in specific life stages, can lead to colony fission or colony foundation. Males move between colonies, however, there are no direct estimations of male dispersal distances for any species. The structured populations and high inbreeding within colonies suggest that dispersal events occur over limited spatial scales and may be mediated by extrinsic and intrinsic factors. Future studies exploring complex relationships between environmental variables, phenotypes of individuals, colony state and dispersal are advocated. Another area of interest is probing the dispersal process itself to understand the mechanisms of information transfer between individuals at the onset of dispersal. This involves designing studies to examine how break-away groups reach a consensus on when to disperse and where to go.

The survival of the shyest: a computational model shows the effect of web structure on the origins of social spiders

2019 ◽  
Vol 155 ◽  
pp. 229-239
Author(s):  
Leonardo Palloni Accetti Resende ◽  
Vitor Passos Rios ◽  
Hilton F. Japyassú
Keyword(s):  
Computational Model ◽  
Social Spiders ◽  
Web Structure

Social Spiders

1976 ◽  
Vol 234 (3) ◽  
pp. 100-106 ◽  
Author(s):  
J. Wesley Burgess
Keyword(s):  
Social Spiders

The Social Spiders in the Clustering of Texts

2012 ◽  
Vol 3 (3) ◽  
pp. 1-14 ◽  
Author(s):  
Reda Mohamed Hamou ◽  
Abdelmalek Amine ◽  
Ahmed Chaouki Lokbani
Keyword(s):  
Data Stream ◽  
Combinatorial Problem ◽  
Large Data ◽  
Social Spiders ◽  
Stream Flows ◽  
The Social ◽  
Textual Data ◽  
Biomimetic Approach ◽  
N Gram

In this paper the authors experiment and test a new biomimetic approach based on social spiders to solve a combinatorial problem ie the automatic classification of texts because a very large data stream flows and particularly on the web. Representation of textual data was performed by a method independent of the language ie n-gram characters and words because there is currently no method of learning that can directly represent unstructured data (text). To validate the classification, the authors used a measure of evaluation based on recall and precision (F-measure). During the experiment, the authors found a powerful visualization tool in social spiders that they exploit to make visual classification.

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