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1

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

100%
Golab M. J., Golab P. A., Contreras-Garduno J., Zajac T., Sniegula S.
Polish Journal of Ecology
|
2017
|
tom 65
|
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.
2

Dziewiczy i błyszczący powab świtezianek

80%
Rzymski P.
Przyroda Polska
|
2013
|
nr 10
3

Nowe stanowisko Crocothemis erythraea (Brulle, 1832) w Polsce Zachodniej

80%
Zawal A.
Odonatrix. Biuletyn Sekcji Odonatologicznej Polskiego Towarzystwa Entomologicznego
|
2010
|
tom 06
|
nr 1
Crocothemis erythraea belongs to rare species in Poland. Previously it was mainly recorded in southern and eastern part of the country, sites from the west were definitely less numerous. The site described in the paper near Dzwonów (53o24’43” N; 15o12’37” E) is the northernmost site of this species in Po- land. It is the complex of a dozen or so ponds with the total area of 500 ha. The biggest pond is shallow, with quickly heating up water of high transparency, with the bottom of silt partially overgrown by: Myriophyllum verticillatum, Potamogeton pectinatus, P. natans, Nuphar luteum and Polygonum amphibium. Shores of the pond are covered with a narrow belt of: Phragmites australis, Typha latipholia and Sparganium erectum. The presence of three males flying above dams was recorded. To the accompanying species belonged: Calopteryx splendens, Lestes sponsa, Erythromma najas, Ischnura elegans, Sympecma fusca, S. paedisca, Platycnemis pennipes, Coenagrion puella, C. pulchellum, Gomphus vulgatissimus, Orthetrum cancellatum, Libellula quadrimaculata and Sympetrum sanguineum. The conditions of this habitat provide the full development of Crocothemis erythraea. Due to the lack of the larvae it is only a possibility.
4

Majowe ważki na Barwiku

70%
Grzedzicka E.
Parki Narodowe
|
2008
|
nr 4
5
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Chodź do wiosennego lasu

51%
Olszowska M.
Wszechświat
|
2014
|
tom 115
|
nr 04-06
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