کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10959828 | 1100579 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structure and mechanical strength of larval cuticle of sawflies capable of “easy bleeding” a defence strategy against predators evolved in Tenthredinidae (Hymenoptera)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The cuticle of Tenthredinidae (Hymenoptera) larvae is ruptured after a very mild mechanical stress and hemolymph is released. This phenomenon, called “easy bleeding” is considered as a defence strategy against predators. We investigated the cuticle structure of some selected species capable of “easy bleeding” by light-, transmission- and scanning microscopy and compared it with phylogenetically-related sawfly species without this defense strategy (control). Cuticle thickness has no major influence on mechanical stability, but pronounced local differences in thickness seem to be inversely correlated with mechanical strength. The density of chitin fibrils is considerably reduced in animals capable of easy bleeding and the fibres form a loose 3D network in contrast to the densely packed layers seen in related “non easy bleeding” species like Strongylogaster multifasciata, where a pressure of 2584Â kPa is needed to pierce the integument, and which served as a control. Efficient bleeders like Phymatocera aterrima (203Â kPa) and Rhadinoceraea nodicornis (219Â kPa) are devoid of any defined layers or other structural elements. In Athalia rosae (Allantinae) (539Â kPa), and Aglaostigma discolor (Tenthredininae) (1494Â kPa) - bleeders with medium efficiency - a reduced number of layers are observed by LM and TEM and a loose network of chitin fibres is visible after treatment with KOH.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tissue and Cell - Volume 37, Issue 1, February 2005, Pages 67-74
Journal: Tissue and Cell - Volume 37, Issue 1, February 2005, Pages 67-74
نویسندگان
Michael Burret, Jean-Luc Boevé, Alison Barker, Margarethe Spindler-Barth,