Effects of Substrate on Foraging Decisions by a Namib Desert Gerbil

1995 ◽  
Vol 76 (2) ◽  
pp. 638-645 ◽  
Author(s):  
J. J. Hughes ◽  
D. Ward ◽  
M. R. Perrin
Science ◽  
2021 ◽  
Vol 371 (6533) ◽  
pp. 1059-1063 ◽  
Author(s):  
D. Dipon Ghosh ◽  
Dongyeop Lee ◽  
Xin Jin ◽  
H. Robert Horvitz ◽  
Michael N. Nitabach

Color detection is used by animals of diverse phyla to navigate colorful natural environments and is thought to require evolutionarily conserved opsin photoreceptor genes. We report that Caenorhabditis elegans roundworms can discriminate between colors despite the fact that they lack eyes and opsins. Specifically, we found that white light guides C. elegans foraging decisions away from a blue-pigment toxin secreted by harmful bacteria. These foraging decisions are guided by specific blue-to-amber ratios of light. The color specificity of color-dependent foraging varies notably among wild C. elegans strains, which indicates that color discrimination is ecologically important. We identified two evolutionarily conserved cellular stress response genes required for opsin-independent, color-dependent foraging by C. elegans, and we speculate that cellular stress response pathways can mediate spectral discrimination by photosensitive cells and organisms—even by those lacking opsins.


Ecosphere ◽  
2017 ◽  
Vol 8 (12) ◽  
pp. e02033 ◽  
Author(s):  
Sebastian Kirchhof ◽  
Robyn S. Hetem ◽  
Hilary M. Lease ◽  
Donald B. Miles ◽  
Duncan Mitchell ◽  
...  

2004 ◽  
Vol 32 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Catherine L. Sole ◽  
Clarke H. Scholtz ◽  
Armanda D. S. Bastos
Keyword(s):  

Ecology ◽  
1994 ◽  
Vol 75 (5) ◽  
pp. 1397-1405 ◽  
Author(s):  
Jessica J. Hughes ◽  
David Ward ◽  
Michael R. Perrin

2016 ◽  
Vol 14 (1) ◽  
pp. 7-17 ◽  
Author(s):  
John Kinahan

Bones of domestic sheep dated to the early first millennium AD are described from the Dâures massif in the Namib Desert. The remains confirm earlier investigations which inferred the acquisition of livestock from indirect evidence in the rock art, suggesting a fundamental shift in ritual practice at this time. Dating of the sheep remains is in broad agreement with the dating of other finds in the same area and in southern Africa as a whole. The presence of suspected sheep bone artefacts, possibly used for ritual purposes, draws attention to the importance of livestock as more than a component of diet in the changing economy of hunter-gatherer society.


Geomorphology ◽  
2013 ◽  
Vol 201 ◽  
pp. 52-59 ◽  
Author(s):  
A. Matmon ◽  
A. Mushkin ◽  
Y. Enzel ◽  
T. Grodek
Keyword(s):  

1990 ◽  
Vol 137 (3) ◽  
pp. 261-271 ◽  
Author(s):  
Abdel Majeed Safer ◽  
Nada Al-Ajmi ◽  
Moudhi N. Bou-Resli
Keyword(s):  

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