A laboratory study of the vulnerability of prey to predation by three aquatic insects

1988 ◽  
Vol 66 (4) ◽  
pp. 875-878 ◽  
Author(s):  
Randall L. Fuller ◽  
Peter A. DeStaffan
Keyword(s):  
Feeding Behavior ◽  
Laboratory Study ◽  
Aquatic Insects ◽  
Prey Vulnerability ◽  
Differential Movement ◽  
Paragnetina Media

The vulnerability of three different prey (Baetis spp., Ephemerella spp., and Simulium spp.) to predation by Nigronia serricornis (Megaloptera) and Paragnetina media and Agnetina capitata (both Plecoptera) was studied in recirculating Plexiglas chambers. When each prey was tested individually, Simulium was least vulnerable to predation by A. capitata and equally vulnerable with Ephemerella to P. media and N. serricornis. Baetis was the most vulnerable to predacious stoneflies while Baetis and Ephemerella were equally vulnerable to N. serricornis. When prey were tested in mixed assemblages, similar trends in prey vulnerability were seen, except that Ephemerella was more vulnerable than Simulium to P. media and N. serricornis. Our data suggest that Ephemerella is less vulnerable than Baetis to predation by stoneflies; however, they were equally vulnerable to N. serricornis, possibly because of differences in feeding behavior and morphology between stoneflies and N. serricornis. Significantly more Simulium larvae moved to the sides and ceiling plates of the experimental chambers versus the control chambers; this differential movement suggests that the presence of predators may have stimulated escape to an apparently predator-free refuge.

A laboratory study of the feeding behavior of the rhabdocoel Mesostoma ehrenbergii on pond Cladocera

1982 ◽  
Vol 60 (6) ◽  
pp. 1305-1307 ◽  
Author(s):  
Steven S. Schwartz ◽  
Paul D. N. Hebert
Keyword(s):  
Feeding Behavior ◽  
Laboratory Study ◽  
Size Dependent ◽  
Prey Behavior ◽  
Cladoceran Species ◽  
Predation Rates

The predation rates of the rhabdocoel Mesostoma ehrenbergii were determined on a number of cladoceran species. Two means of capturing prey are employed by the flatworm but only active predation was explored in these experiments. It was found that this flatworm is a size-dependent predator with a preference for prey of about 1.2 mm. It was also observed that prey behavior was not an important factor in determining susceptibility to predation. M. ehrenbergii is a voracious predator; individuals consume more than 10 prey/day.

Predator–prey interactions in a stream: a combined field and laboratory study of Paragnetina media (Plecoptera) and Hydropsyche sparna (Trichoptera)

1987 ◽  
Vol 65 (2) ◽  
pp. 448-451 ◽  
Author(s):  
Blair W. Feltmate
Keyword(s):  
Laboratory Study ◽  
Negative Correlation ◽  
Substrate Surface ◽  
Significant Negative Correlation ◽  
Lower Surface ◽  
Laboratory Findings ◽  
Predator Prey ◽  
Surface Colonization ◽  
Substrate Size ◽  
Paragnetina Media

Substrate size selection, upper and lower substrate surface colonization, and net spinning were examined for the caddisfly Hydropsyche sparna in the presence and absence of the predaceous stonefly Paragnetina media. In the laboratory, I found that when stoneflies were present, caddisflies selected larger substrate and spun fewer nets. Upper and lower surface colonization of substrate did not change as a function of P. media presence. Laboratory findings were consistent with observations made of H. sparna and P. media in the Credit River, Ontario, during midsummer 1983. Based on Hess sample collections, I observed a significant negative correlation between stonefly and caddisfly densities.

Feeding Behavior of Aquatic Insects: Case Studies on Black Fly and Mosquito Larvae

1996 ◽  
Vol 115 (3) ◽  
pp. 206 ◽  
Author(s):  
Richard W. Merritt ◽  
Douglas A. Craig ◽  
Roger S. Wotton ◽  
Edward D. Walker
Keyword(s):  
Feeding Behavior ◽  
Case Studies ◽  
Aquatic Insects ◽  
Mosquito Larvae ◽  
Black Fly

scholarly journals A REPORT ON DRIFTING BEHAVIOUR OF ODONATA (AQUATIC INSECTS) IN KYUNJA GAD, A SPRING FED TRIBUTARY OF RIVER MANDAKINI, CHAMOLI GARHWAL, UTTARAKHAND

2019 ◽  
Vol 14 (2) ◽  
Author(s):  
Pankaj Bahuguna ◽  
H K Joshi ◽  
Koshal Kumar
Keyword(s):  
Water Quality ◽  
Feeding Behavior ◽  
Aquatic Insects ◽  
Environmental Changes ◽  
Present Communication ◽  
Important Group ◽  
Highly Sensitive

Odonata is an important group of macroinvertebrates which are highly sensitive to environmental changes and pollution. This is the reason why they are mostly studied as change in water quality pattern. The dial study of drifting behavior in such species also indicates towards the feeding behavior of fishes available in that habitat. In the present communication an attempt has been made to view the drifting patterns in a sensitive macro zoobenthic group Odonata in the Kyunja Gad which is a tributary of the snow-fed River Mandakani.

scholarly journals A REPORT ON DRIFTING BEHAVIOUR OF ODONATA (AQUATIC INSECTS) IN KYUNJA GAD, A SPRING FED TRIBUTARY OF RIVER MANDAKINI, CHAMOLI GARHWAL, UTTARAKHAND

2019 ◽  
Vol 14 (2) ◽  
Author(s):  
Pankaj Bahuguna ◽  
H K Joshi ◽  
Koshal Kumar
Keyword(s):  
Water Quality ◽  
Feeding Behavior ◽  
Aquatic Insects ◽  
Environmental Changes ◽  
Present Communication ◽  
Important Group ◽  
Highly Sensitive

Odonata is an important group of macroinvertebrates which are highly sensitive to environmental changes and pollution. This is the reason why they are mostly studied as change in water quality pattern. The dial study of drifting behavior in such species also indicates towards the feeding behavior of fishes available in that habitat. In the present communication an attempt has been made to view the drifting patterns in a sensitive macro zoobenthic group Odonata in the Kyunja Gad which is a tributary of the snow-fed River Mandakani.

Laboratory and in-situ analysis of comet dust

1988 ◽  
Vol 46 ◽  
pp. 8-9
Author(s):  
D.E. Brownlee ◽  
A.L. Albee
Keyword(s):  
Electron Microscopy ◽  
Solar System ◽  
Laboratory Study ◽  
Isotopic Analysis ◽  
Building Blocks ◽  
Sem Analysis ◽  
Early Solar System ◽  
Cometary Material ◽  
Comet Dust

Comets are primitive, kilometer-sized bodies that formed in the outer regions of the solar system. Composed of ice and dust, comets are generally believed to be relic building blocks of the outer solar system that have been preserved at cryogenic temperatures since the formation of the Sun and planets. The analysis of cometary material is particularly important because the properties of cometary material provide direct information on the processes and environments that formed and influenced solid matter both in the early solar system and in the interstellar environments that preceded it.The first direct analyses of proven comet dust were made during the Soviet and European spacecraft encounters with Comet Halley in 1986. These missions carried time-of-flight mass spectrometers that measured mass spectra of individual micron and smaller particles. The Halley measurements were semi-quantitative but they showed that comet dust is a complex fine-grained mixture of silicates and organic material. A full understanding of comet dust will require detailed morphological, mineralogical, elemental and isotopic analysis at the finest possible scale. Electron microscopy and related microbeam techniques will play key roles in the analysis. The present and future of electron microscopy of comet samples involves laboratory study of micrometeorites collected in the stratosphere, in-situ SEM analysis of particles collected at a comet and laboratory study of samples collected from a comet and returned to the Earth for detailed study.

When Apologies for Injustice Matter

2008 ◽  
Vol 13 (4) ◽  
pp. 239-247 ◽  
Author(s):  
David De Cremer ◽  
Barbara C. Schouten
Keyword(s):  
Laboratory Study ◽  
Interaction Effect ◽  
Interactive Effect ◽  
Cross Sectional ◽  
Fairness Perceptions ◽  
Organizational Survey ◽  
Experimental Laboratory

The present research examined the idea that the effectiveness of apologies on promoting fairness perceptions depends on how meaningful and sincere the apology is experienced. More precisely, it was predicted that apologies are more effective when they are communicated by an authority being respectful to others. A study using a cross-sectional organizational survey showed that an apology (relative to giving no apology) revealed higher fairness perceptions, but only so when the authority was respectful rather than disrespectful. In a subsequent experimental laboratory study the same interaction effect (as in Study 1) on fairness perceptions was found. In addition, a similar interaction effect also emerged on participants’ self-evaluations in terms of relational appreciation (i.e., feeling valued and likeable). Finally, these self-evaluations accounted (at least partly) for the interactive effect on fairness perceptions.

Sign in / Sign up

Export Citation Format

Share Document