Selective Predation and Productivity Jointly Drive Complex Behavior in Host‐Parasite Systems

2005 ◽  
Vol 165 (1) ◽  
pp. 70-81 ◽  
Author(s):  
Spencer R. Hall ◽  
Meghan A. Duffy ◽  
Carla E. Cáceres
Keyword(s):  
Complex Behavior ◽  
Selective Predation ◽  
Host Parasite

The Impact of Selective Predation on Host–Parasite SIS Dynamics

2019 ◽  
Vol 81 (7) ◽  
pp. 2510-2528
Author(s):  
Caterina Vitale ◽  
Alex Best
Keyword(s):  
Selective Predation ◽  
Host Parasite ◽  
The Impact

Implications of selective predation on the macroevolution of eukaryotes: evidence from Arctic Canada

2018 ◽  
Vol 2 (2) ◽  
pp. 247-255 ◽  
Author(s):  
Corentin C. Loron ◽  
Robert H. Rainbird ◽  
Elizabeth C. Turner ◽  
J. Wilder Greenman ◽  
Emmanuelle J. Javaux
Keyword(s):  
Molecular Clock ◽  
Abiotic Factors ◽  
Complex Behavior ◽  
Marine Environments ◽  
Arctic Canada ◽  
Selective Predation ◽  
Crown Group ◽  
Paleontological Data ◽  
Biotic And Abiotic Factors ◽  
Selection Of

Existing paleontological data indicate marked eukaryote diversification in the Neoproterozoic, ca. 800 Ma, driven by predation pressure and various other biotic and abiotic factors. Although the eukaryotic record remains less diverse before that time, molecular clock estimates and earliest crown-group affiliated microfossils suggest that the diversification may have originated during the Mesoproterozoic. Within new assemblages of organic-walled microfossils from the ca. 1150 to 900 Ma lower Shaler Supergroup of Arctic Canada, numerous specimens from various taxa display circular and ovoid perforations on their walls, interpreted as probable traces of selective protist predation, 150–400 million years before their first reported incidence in the Neoproterozoic. Selective predation is a more complex behavior than phagotrophy, because it requires sensing and selection of prey followed by controlled lysis of the prey wall. The ca. 800 Ma eukaryotic diversification may have been more gradual than previously thought, beginning in the late Mesoproterozoic, as indicated by recently described microfossil assemblages, in parallel with the evolution of selective eukaryovory and the spreading of eukaryotic photosynthesis in marine environments.

The Pathogenesis of Experimental Mycotic Encephalitis

1969 ◽  
Vol 27 ◽  
pp. 356-357
Author(s):  
James A. Swenberg ◽  
Adalbert Koestner ◽  
R.P. Tewari
Keyword(s):  
Electron Microscopy ◽  
Pathogenetic Mechanisms ◽  
Host Parasite

Previous investigations of pathogenetic mechanisms in mycotic encephalitis have been restricted to light microscopic and mycologic approaches. In this study, electron microscopy was utilized to determine the mode of vascular penetration and the cellular and subcellular host-parasite interrelationships in brains of mice infected with Oidiodendron kalrai. This newly isolated fungus was selected because of its ability to consistently produce encephalitis with gross and microscopic lesions similar to those observed in naturally occuring mycoses.

Examination of Schistosome Cercariae and Schistosomules by Scanning Electron Microscopy

1969 ◽  
Vol 27 ◽  
pp. 50-51
Author(s):  
D. Johnson ◽  
P. Moriearty
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Light Microscopy ◽  
Surface Structure ◽  
Extensive Study ◽  
Scanning Microscopy ◽  
Host Parasite ◽  
Conventional Electron Microscopy ◽  
Scanning Electron

Since several species of Schistosoma, or blood fluke, parasitize man, these trematodes have been subjected to extensive study. Light microscopy and conventional electron microscopy have yielded much information about the morphology of the various stages; however, scanning electron microscopy has been little utilized for this purpose. As the figures demonstrate, scanning microscopy is particularly helpful in studying at high resolution characteristics of surface structure, which are important in determining host-parasite relationships.

Sign in / Sign up

Export Citation Format

Share Document