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1

Preliminary studies on the durability of damselfly (Odonata: Zygoptera) exuviae

100%
Straka M.
Odonatrix. Biuletyn Sekcji Odonatologicznej Polskiego Towarzystwa Entomologicznego
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2010
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tom 06
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nr 2
Twenty exuviae of Coenagrion puella were marked and observed for three weeks in 2005. The number of marked exuviae rapidly declined and after 23 days there were only 30% of exuviae left; these were so weather-worn that it was impossible to identify them. To collect 50% of the exuviae it would be necessary to visit a locality 10 days after emergence.
2

The effects of habitat deterioration and social status on patrolling behavior in the territorial damselfly Calopteryx splendens

84%
Golab M. J., Golab P. A., Contreras-Garduno J., Zajac T., Sniegula S.
Polish Journal of Ecology
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2017
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tom 65
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nr 1
Patrolling behavior plays an important role in resource defense and in shaping social interactions in territorial species. However, it is not clear whether and how resource deterioration affects patrolling and interactions between territorial males. We addressed this issue by studying the territorial patrolling of damselfly Calopteryx splendens males, which use riverine vegetation patches composed of floating rafts of Potamogeton natans as territories. Males can hold single territories established on one vegetation patch (solitary residents) or hold adjacent territories established on shared vegetation patch (contiguous residents). The study predicted that solitary males engage more in patrolling than contiguous residents and that patrolling intensity is proportional to patch quality. Two types of semi-natural vegetation patches were sunk: of high and low quality measured on the basis of the patch size (range 2–5 m2) and its attractiveness to damselflies (measured as number of residents, non-territorial males and contests observed at a given patch). Changes in number of patrolling flights were monitored for solitary and two contiguous residents: first which hold territory situated closer to the patch centre and secondary holding territory nearer to the edge of a patch. Results indicated that solitary residents patrolled more often than either of the two contiguous residents. Habitat deterioration significantly reduced the patrolling intensity of both single and first contiguous resident, however, their patrolling activity was not resumed at the same intensity after the original patch had been restored. The secondary resident of a contiguous pair did not respond to habitat deterioration, but increased its patrolling activity following restoration. Patch quality was found to have no impact on patrolling, which implies that social context can be more important in predicting changes in patrolling behavior in response to resource deterioration.
3
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Richness and diversity of odonates of the agricultural college and research institute, Vazhavachanur, Tamilnadu, India

84%
Radhakrishnan V., Arulprakash R., Parivarthani I., Ponnivalavan S., Priyadharshini M., Pandiyan M.
Acta Biologica
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2020
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tom 27
4

Habitats of Odonata in the Bialowieza Forest and its surroundings [Poland]

84%
Theuerkauf J., Rouys S.
Fragmenta Faunistica
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2001
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tom 44
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nr 1
5

Parasitism of Odonata by Arrenurus (Acari: Hydrachnidia) larvae in the Lake Swidwie, nature reserve (NW Poland)

67%
Zawal A., Buczynski P.
Acta Parasitologica
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2013
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tom 58
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nr 4
Larvae of a vast majority of water mite species are parasites of aquatic insects. Owing to this, they migrate to new localities, and are able to survive unfavourable environmental conditions. This also concerns species from subgenus Arrenurus s. str., parasites of dragonflies. The detailed analysis of this phenomenon, however, has only been possible in the last several years, since the key to the identification of larvae from genus Arrenurus Dug. was published. In 2010, the parasitism of Arrenurus s. str. larvae on dragonflies in the Lake Świdwie reserve (NW Poland) was analysed. Larvae of 9 species of water mites were recorded on 107 imagines of dragonflies from 8 species. The following were identified as hosts of water mites for the first time: Anax imperator, Libellula quadrimaculata, and Leucorrhinia caudalis. The highest prevalence occurred in the case of: Erythromma najas and Lestes dryas (100%), Coenagrion pulchellum (96.5%), and C. puella (80.0%). Coenagrion pulchellum was infested by 9 species of parasites, C. puella by 6, and Erythromma najas and Lestes dryas by three species. The highest number of host species occurred in the case of Arrenurus maculator (5); followed by A. cuspidator, A. batillifer cf., A. bicuspidator, and A. tetracyphus (3 each); A. papillator, A. tricuspidator, and A. bruzelii (2 each), and A. claviger (1). Differentiation of preferences of particular parasites towards various parts of the host body was observed, probably related to the coevolution of parasites and hosts, and competition between the host species. The body sizes of the parasites suggest that approximately 50% of body size growth of water mites from subgenus Arrenurus s. str. occurs at the stage of parasitic larva.
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