Citation
Structural benefits and distribution of cribellar thread in adult Tengella radiata webs (Araneae: Tengellidae)

Material Information

Title:
Structural benefits and distribution of cribellar thread in adult Tengella radiata webs (Araneae: Tengellidae)
Translated Title:
Beneficios estructurales y la distribución de hilo cribelado en telas de Tengella radiata adultas (Araneae: Tengellidae)
Creator:
Ramirez, Annakaren
Publication Date:
Language:
Text in English

Subjects

Subjects / Keywords:
Spider webs ( lcsh )
Telarañas ( lcsh )
Spiders ( lcsh )
Arañas ( lcsh )
Costa Rica--Puntarenas--Monteverde Zone
Costa Rica--Puntarenas--Zona de Monteverde
EAP Spring 2017
EAP Primavera 2017
Genre:
Reports

Notes

Abstract:
Tengella radiata is a spider endemic to Costa Rica whose webs change as spiderlings mature into adulthood. As adults, a key component of their webs is their use of cribellar thread, spun from a specialized silk-producing organ, the cribellum. This paper seeks to figure out what the structural benefits and distribution of this silk in adult Tengella radiata webs. To address this question, I analyzed thread density in different regions of the web, the amount of cribellar thread used in different segments of the web, and tested thread resistance in cribellar and non-cribellar thread. I found that the area near the spider’s tunnel has a higher thread density with little to no cribellar thread, while the periphery of the thread has less thread density but also has the highest amount of cribellar thread. I also found that cribellar thread is three times stronger than non-cribellar thread. This is an indicator that their web structures have a different arrangement according to web location. This could also be relevant for establishing a specific prey capture technique. ( ,, )
Abstract:
Tengella radiata es una araña endémica de Costa Rica cuyas telas cambian conforme las arañas van madurando. Como adultas, un componente clave de sus telas es el uso de hilo cribelado, hilado por un órgano especializado, el cribelo. Este trabajo procura estudiar los beneficios estructurales que ofrece este tipo de hilo al analizar la distribución de este en la telaraña. Para esto, analicé la densidad de todos los hilos en diferentes lugares de la telaraña, la cantidad de hilo cribelado utilizado en diferentes segmentos de la telaraña, y también probé la resistencia de hilo cribelar y el hilo no cribelado en la misma tela. Descubrí que el área más cercana al túnel de la araña tiene la mayor densidad de hilos de seda con poco o sin ningún hilo cribelado, mientras que la periferia de la tela tiene menor densidad de hilos pero también tiene la mayor cantidad de hilo cribelado. También encontré que el hilo cribelado es tres veces más resistente que el hilo no cribelado. Esto indica que la estructura específica de las telarañas tienen arreglos diferentes según la posición en la tela. Esto también puede ser relevante para establecer una técnica específica de captura de presas.
Biographical:
Student affiliation: University of California, Berkeley
General Note:
Born Digital

Record Information

Source Institution:
Monteverde Institute
Holding Location:
Monteverde Institute
Rights Management:
This item is licensed with the Creative Commons Attribution Non-Commercial No Derivative License. This license allows others to download this work and share them with others as long as they mention the author and link back to the author, but they can’t change them in any way or use them commercially.
Resource Identifier:
M39-00625 ( USFLDC DOI )
m39.625 ( USFLDC Handle )

USFLDC Membership

Aggregations:
Tropical Ecology Collection [Monteverde Institute]

Postcard Information

Format:
Book

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