Staff View: Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

Bibliographic Details
Main Authors:	Balsamo, Ronald., Hofmeyr, Margaretha., Henen, Brian., Bauer, Aaron.
Format:	Villanova Faculty Authorship
Language:	English
Published:	2003
Online Access:	http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:173961

Main Authors:

Balsamo, Ronald., Hofmeyr, Margaretha., Henen, Brian., Bauer, Aaron.

Format:

Villanova Faculty Authorship

Language:

English

Published:

2003

Online Access:

http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:173961

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spelling	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus. Balsamo, Ronald. Hofmeyr, Margaretha. Henen, Brian. Bauer, Aaron. Food and non-food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8 October and 31 October 2002 were synthesized with literature reports to develop species lists of food and non-food grasses and geophytes in renosterveld habitat. Failure load and tensile strength were determined in the field for leaves of food and non-food plants that were spatially available to the tortoises and present in relative abundance during the course of the study. Leaves of geophyte food plants were fleshy and succulent with a low failure load and tensile strength. Leaves of food plant grasses had significantly higher failure loads and tensile strengths compared to leaves of food plant geophytes. In non-food plants there was no significant difference in failure load between grasses and geophytes, but tensile strength was significantly higher in the grasses. Non-food plant grasses and geophytes overall had significantly higher failure load and tensile strength values than did food plants. Two non-food plants that overlapped in mechanical strength to the food plants either have toxic/unpalatable chemicals in high amounts or are recent invasive species to the renosterveld. Thus, these studies support the hypothesis that leaf biomechanical properties may be an important factor in determining the diet of the geometric tortoise and perhaps tortoises in general. 2003 Villanova Faculty Authorship vudl:173961 African Zoology 39(2), 2004, 175-181. en
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dc.creator_txt_mv	Balsamo, Ronald. Hofmeyr, Margaretha. Henen, Brian. Bauer, Aaron.
dc.description_txt_mv	Food and non-food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8 October and 31 October 2002 were synthesized with literature reports to develop species lists of food and non-food grasses and geophytes in renosterveld habitat. Failure load and tensile strength were determined in the field for leaves of food and non-food plants that were spatially available to the tortoises and present in relative abundance during the course of the study. Leaves of geophyte food plants were fleshy and succulent with a low failure load and tensile strength. Leaves of food plant grasses had significantly higher failure loads and tensile strengths compared to leaves of food plant geophytes. In non-food plants there was no significant difference in failure load between grasses and geophytes, but tensile strength was significantly higher in the grasses. Non-food plant grasses and geophytes overall had significantly higher failure load and tensile strength values than did food plants. Two non-food plants that overlapped in mechanical strength to the food plants either have toxic/unpalatable chemicals in high amounts or are recent invasive species to the renosterveld. Thus, these studies support the hypothesis that leaf biomechanical properties may be an important factor in determining the diet of the geometric tortoise and perhaps tortoises in general.
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author	Balsamo, Ronald. Hofmeyr, Margaretha. Henen, Brian. Bauer, Aaron.
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description	Food and non-food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8 October and 31 October 2002 were synthesized with literature reports to develop species lists of food and non-food grasses and geophytes in renosterveld habitat. Failure load and tensile strength were determined in the field for leaves of food and non-food plants that were spatially available to the tortoises and present in relative abundance during the course of the study. Leaves of geophyte food plants were fleshy and succulent with a low failure load and tensile strength. Leaves of food plant grasses had significantly higher failure loads and tensile strengths compared to leaves of food plant geophytes. In non-food plants there was no significant difference in failure load between grasses and geophytes, but tensile strength was significantly higher in the grasses. Non-food plant grasses and geophytes overall had significantly higher failure load and tensile strength values than did food plants. Two non-food plants that overlapped in mechanical strength to the food plants either have toxic/unpalatable chemicals in high amounts or are recent invasive species to the renosterveld. Thus, these studies support the hypothesis that leaf biomechanical properties may be an important factor in determining the diet of the geometric tortoise and perhaps tortoises in general.
title	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
title_full	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
title_fullStr	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
title_full_unstemmed	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
title_short	Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
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Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.
Balsamo, Ronald.
Hofmeyr, Margaretha.
Henen, Brian.
Bauer, Aaron.
Food and non-food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8 October and 31 October 2002 were synthesized with literature reports to develop species lists of food and non-food grasses and geophytes in renosterveld habitat. Failure load and tensile strength were determined in the field for leaves of food and non-food plants that were spatially available to the tortoises and present in relative abundance during the course of the study. Leaves of geophyte food plants were fleshy and succulent with a low failure load and tensile strength. Leaves of food plant grasses had significantly higher failure loads and tensile strengths compared to leaves of food plant geophytes. In non-food plants there was no significant difference in failure load between grasses and geophytes, but tensile strength was significantly higher in the grasses. Non-food plant grasses and geophytes overall had significantly higher failure load and tensile strength values than did food plants. Two non-food plants that overlapped in mechanical strength to the food plants either have toxic/unpalatable chemicals in high amounts or are recent invasive species to the renosterveld. Thus, these studies support the hypothesis that leaf biomechanical properties may be an important factor in determining the diet of the geometric tortoise and perhaps tortoises in general.
2003
Villanova Faculty Authorship
vudl:173961
African Zoology 39(2), 2004, 175-181.
en

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Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

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Balsamo, Ronald.
Hofmeyr, Margaretha.
Henen, Brian.
Bauer, Aaron.

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Food and non-food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8 October and 31 October 2002 were synthesized with literature reports to develop species lists of food and non-food grasses and geophytes in renosterveld habitat. Failure load and tensile strength were determined in the field for leaves of food and non-food plants that were spatially available to the tortoises and present in relative abundance during the course of the study. Leaves of geophyte food plants were fleshy and succulent with a low failure load and tensile strength. Leaves of food plant grasses had significantly higher failure loads and tensile strengths compared to leaves of food plant geophytes. In non-food plants there was no significant difference in failure load between grasses and geophytes, but tensile strength was significantly higher in the grasses. Non-food plant grasses and geophytes overall had significantly higher failure load and tensile strength values than did food plants. Two non-food plants that overlapped in mechanical strength to the food plants either have toxic/unpalatable chemicals in high amounts or are recent invasive species to the renosterveld. Thus, these studies support the hypothesis that leaf biomechanical properties may be an important factor in determining the diet of the geometric tortoise and perhaps tortoises in general.

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Hofmeyr, Margaretha.
Henen, Brian.
Bauer, Aaron.

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Hofmeyr, Margaretha.
Henen, Brian.
Bauer, Aaron.
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Henen, Brian.
Bauer, Aaron.

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Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

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Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

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Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus.

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