Elektronenmikroskopische Befunde am bestrahlten Oberschlundganglion von Odonaten-Larven (Calopteryx splendens Haar.)

1964 ◽  
Vol 63 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Christiane Buchholtz
Keyword(s):  
Calopteryx Splendens

scholarly journals Sex-Related Effects in the Superhydrophobic Properties of Damselfly Wings in Young and Old Calopteryx splendens

PLoS ONE ◽  
2014 ◽  
Vol 9 (2) ◽  
pp. e88627 ◽  
Author(s):  
Katja Kuitunen ◽  
Alexander Kovalev ◽  
Stanislav N. Gorb
Keyword(s):  
Calopteryx Splendens

scholarly journals The effect of male-male competition and ornament size on mean and variance of courtship intensity towards heterospecific and conspecific females

2015 ◽  
Vol 65 (2) ◽  
pp. 113-131
Author(s):  
Inka Keränen ◽  
Aapo Kahilainen ◽  
Janne S. Kotiaho ◽  
Katja Kuitunen
Keyword(s):  
Reproductive Investment ◽  
Search Costs ◽  
Competitive Environment ◽  
Species Discrimination ◽  
Sexual Ornaments ◽  
Courtship Intensity ◽  
In The Wild ◽  
Mean And Variance ◽  
Calopteryx Splendens

Discrimination between hetero- and conspecifics is the elementary choice an individual performs when searching for potential mates. The level of selectivity and strength of species discrimination is modified by variance in the quality of females, level of the male’s reproductive investment, mate search costs, and the competitive environment. The effect of the competitive environment on both species discrimination and conspecific mate choice has seldom been studied simultaneously. We experimentally manipulated territorial competition ofCalopteryx splendensdamselfly males in the wild, and asked two questions. First, does increased competition influence the territorial males’ responses towards introduced heterospecificC. virgofemales. The effect of the size of the territorial males’ sexual ornaments (wing spot) on their responses towards females was also investigated. Second, does increased competition influence the territorial males’ response towards conspecific females? The effect of the size of the territorial males ornament was again investigated. The mean level of response towards heterospecific females did not change between the control (i.e., no competitors presented) and the competition (i.e., two competitors presented) treatments, but the variance of responses towards heterospecifics was greater in the competition treatment. The territorial males’ responses towards conspecific females did not change between control and competition treatments. These results indicate individual differences in the behavior of males towards heterospecifics when territorial competition was experienced. The observed pattern of discrimination might be adaptive when overall reproductive success is considered.

Breeding Behaviour and Oviposition in Hetaerina americana (Fabricius) and H. titia (Drury) (Odonata: Agriidae)

1961 ◽  
Vol 93 (4) ◽  
pp. 260-266 ◽  
Author(s):  
Clifford Johnson
Keyword(s):  
Species Recognition ◽  
Color Pattern ◽  
Sexually Dimorphic ◽  
Body Coloration ◽  
Ischnura Elegans ◽  
Wing Patterns ◽  
Central Texas ◽  
Abdominal Appendages ◽  
Calopteryx Splendens ◽  
Wing Coloration

The objective of this study is to describe the copulatory and ovipositional behaviour of Hetaerina americana and H. titia, and to depict any differences in such behaviour as may exist between these two species. It is quite important in such studies to understand the mechanisms which assure conspecific mating. Both americana and titia are found breeding together on many of the streams of central Texas. Williamson (1906) pointed out that species in which the abdominal appendages were very similar often had sexually dimorphic and/or specifically distinct wing coloration, while species with clear wings had quite distinct abdominal appendages. These different wing patterns were suggested as functioning in species recognition for conspecific mating. Buchholtz (1951, 1955) experimentally verified that the females of Calopteryx splendens recognize and respond to males of their own species through a set of optical stimuli including the color pattern of the wing. Loibl (1958) and Krieger and Krieger-Lobl (1958) experimentally demonstrated that in Lestes dryas, L. sponsa, Ischnura elegans and I. pumila, all of which have clear, colorless wings, the species recognition factors are the shape of the abdominal appendages and body coloration. Williamson's early inferences appear to have been well documented.

Dragonfly flight. III. Lift and power requirements.

1997 ◽  
Vol 200 (3) ◽  
pp. 583-600 ◽  
Author(s):  
JM Wakeling ◽  
CP Ellington
Keyword(s):  
Heat Production ◽  
Power Output ◽  
Aerodynamic Force ◽  
Lift Coefficient ◽  
Mechanical Efficiency ◽  
Specific Power ◽  
Free Flight ◽  
Mechanical Power Output ◽  
Low Costs ◽  
Calopteryx Splendens

A mean lift coefficient quasi-steady analysis has been applied to the free flight of the dragonfly Sympetrum sanguineum and the damselfly Calopteryx splendens. The analysis accommodated the yaw and accelerations involved in free flight. For any given velocity or resultant aerodynamic force (thrust), the damselfly mean lift coefficient was higher than that for the dragonfly because of its clap and fling. For both species, the maximum mean lift coefficient L was higher than the steady CL,max. Both species aligned their strokes planes to be nearly normal to the thrust, a strategy that reduces the L required for flight and which is different from the previously published hovering and slow dragonfly flights with stroke planes steeply inclined to the horizontal. Owing to the relatively low costs of accelerating the wing, the aerodynamic power required for flight represents the mechanical power output from the muscles. The maximum muscle mass-specific power was estimated at 156 and 166 W kg-1 for S. sanguineum and C. splendens, respectively. Measurements of heat production immediately after flight resulted in mechanical efficiency estimates of 13 % and 9 % for S. sanguineum and C. splendens muscles, respectively.

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