Deliry Cyrille le 6 janvier 2026 à 03:46

2026-01-06T03:46:13Z

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			'''Résumé''' (traduction libre)<br>
			La [[British Dragonfly Society]] a mené une étude sur ''[[Brachytron pratense]]'' et ''[[Calopteryx virgo]]'' pour le Scottish Natural Heritage (SNH) dans le cadre du suivi du Scottish Beaver Trial 2009-2014. Les '''[[Castors]]''' ont considérablement réduit la végétation aquatique dans certains lochs et construit des barrages, quadruplant ainsi la taille d'un loch. À la fin de l'étude, ''[[Brachytron pratense]]'' se reproduisait toujours dans les lochs touchés. La période d'étude était trop courte pour évaluer tous les effets sur cette espèce. Bien qu'il y ait eu une diminution du nombre de larves et d'exuvies dans l'un des lochs où l'activité des castors était intense, aucune tendance évidente n'a été observée dans les trois autres. Depuis l'essai, les castors se sont installés dans de nouveaux lochs et ont construit des barrages sur un ruisseau. En 2016, ''[[Brachytron pratense]]'' a été observé dans tous les lochs et des larves ont été trouvées dans les principaux lochs échantillonnés. Le gouvernement écossais a décidé d'autoriser les castors à rester en Écosse et à se propager naturellement. Les résultats de l'étude sur ''[[Calopteryx virgo]]'' n'ont pas été inclus, car les castors n'ont pas utilisé les ruisseaux pendant la période d'étude. Cependant, ces données seront importantes pour la surveillance future.
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	'''Abstract'''<br>		'''Abstract'''<br>
	The British Dragonfly Society surveyed ''[[Brachytron pratense]]'' Hairy Dragonfly and ''[[Calopteryx virgo]]'' Beautiful Demoiselle for Scottish Natural Heritage (SNH) as part of the monitoring for the Scottish Beaver Trial 2009-2014. The '''[[Castors\|beavers]]''' drastically reduced the aquatic vegetation in some lochs and constructed dams, increasing the size of one loch four-fold. At the end of the survey ''[[Brachytron pratense]]'' was still breeding at the affected lochs. The study period was too short to evaluate the full effects on this species. Although there was a decline in the numbers of larvae and exuviae at one of the lochs where there was high beaver activity there were no obvious trends at the other three. Since the trial, beavers have moved into new lochs and built dams on one burn. In 2016 ''[[Brachytron pratense]]'' was seen at all lochs and larvae found at the main lochs sampled. The Scottish Government’s decision is to allow beavers to remain in Scotland and spread naturally. Results from the survey of ''[[Calopteryx virgo]]'' have not been included as the beavers did not use the burns during the survey period. However, these data will be important for future monitoring.		The [[British Dragonfly Society]] surveyed ''[[Brachytron pratense]]'' Hairy Dragonfly and ''[[Calopteryx virgo]]'' Beautiful Demoiselle for Scottish Natural Heritage (SNH) as part of the monitoring for the Scottish Beaver Trial 2009-2014. The '''[[Castors\|beavers]]''' drastically reduced the aquatic vegetation in some lochs and constructed dams, increasing the size of one loch four-fold. At the end of the survey ''[[Brachytron pratense]]'' was still breeding at the affected lochs. The study period was too short to evaluate the full effects on this species. Although there was a decline in the numbers of larvae and exuviae at one of the lochs where there was high beaver activity there were no obvious trends at the other three. Since the trial, beavers have moved into new lochs and built dams on one burn. In 2016 ''[[Brachytron pratense]]'' was seen at all lochs and larvae found at the main lochs sampled. The Scottish Government’s decision is to allow beavers to remain in Scotland and spread naturally. Results from the survey of ''[[Calopteryx virgo]]'' have not been included as the beavers did not use the burns during the survey period. However, these data will be important for future monitoring.

Deliry Cyrille : Page créée avec « {{Site}} ---- {{Batty2017}} ---- '''Abstract'''
The British Dragonfly Society surveyed ''Brachytron pratense'' Hairy Dragonfly and ''Calopteryx virgo'' Beautiful Demoiselle for Scottish Natural Heritage (SNH) as part of the monitoring for the Scottish Beaver Trial 2009-2014. The '''beavers''' drastically reduced the aquatic vegetation in some lochs and constructed dams, increasing the size of one loch four-fold. At the end of the survey ''... »

2026-01-06T03:43:45Z

Page créée avec « {{Site}} ---- {{Batty2017}} ---- '''Abstract'''<br> The British Dragonfly Society surveyed ''Brachytron pratense'' Hairy Dragonfly and ''Calopteryx virgo'' Beautiful Demoiselle for Scottish Natural Heritage (SNH) as part of the monitoring for the Scottish Beaver Trial 2009-2014. The '''beavers''' drastically reduced the aquatic vegetation in some lochs and constructed dams, increasing the size of one loch four-fold. At the end of the survey ''... »

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{{Site}}
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{{Batty2017}}
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'''Abstract'''<br>
The British Dragonfly Society surveyed ''[[Brachytron pratense]]'' Hairy Dragonfly and ''[[Calopteryx virgo]]'' Beautiful Demoiselle for Scottish Natural Heritage (SNH) as part of the monitoring for the Scottish Beaver Trial 2009-2014. The '''[[Castors|beavers]]''' drastically reduced the aquatic vegetation in some lochs and constructed dams, increasing the size of one loch four-fold. At the end of the survey ''[[Brachytron pratense]]'' was still breeding at the affected lochs. The study period was too short to evaluate the full effects on this species. Although there was a decline in the numbers of larvae and exuviae at one of the lochs where there was high beaver activity there were no obvious trends at the other three. Since the trial, beavers have moved into new lochs and built dams on one burn. In 2016 ''[[Brachytron pratense]]'' was seen at all lochs and larvae found at the main lochs sampled. The Scottish Government’s decision is to allow beavers to remain in Scotland and spread naturally. Results from the survey of ''[[Calopteryx virgo]]'' have not been included as the beavers did not use the burns during the survey period. However, these data will be important for future monitoring.

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Deliry Cyrille le 6 janvier 2026 à 03:46