Investigating damselfly populations at springs in Banff National Park, Canada, with special focus on Argia vivida, Amphiagrion abbreviatum, and Ischnura cervula (Odonata: Coenagrionidae) |
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Authors: | Christine L R Hornung Charlie Pacas |
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Institution: | (1) University of Alberta, 751 GSB, Edmonton, AB, Canada, T6G 2H1;(2) Aquatics Specialist, Banff National Park, 900, Banff, AB, Canada, T1L 1K2 |
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Abstract: | The objective of this study was to estimate Argia vivida (Odonata: Coenagrionidae) populations, identify breeding habitat, and investigate movement of adults within Banff National
Park, Alberta, Canada, during the summer of 2003. Mark-recapture techniques and standardized dip-net surveys were used to
monitor Argia vivida at various life stages. A reproductive index identified which sites Argia vivida recognized as suitable breeding habitat, and exuvia surveys confirmed breeding sites. The basic structure of emergent and
surrounding vegetation was measured to investigate the importance of available ovipositing or roosting sites and the condition
of the matrix habitat. Data was recorded for Amphiagrion abbreviatum and Ischnura cervula (both Odonata: Coenagrionidae) to determine if these spring-associated damselflies were successfully breeding within Banff
National Park. Comparisons were made between the highly protected Middle Springs and the heavily altered Cave & Basin Springs.
Additional surveys at the Vermilion Lake cool spring and Middle Springs Bog investigated their use as breeding habitat for
Amphiagrion abbreviatum and Argia vivida, respectively. Results suggest the ecological value of thermal springs extends beyond their origin to outflows and downstream
pools. Conservation of Argia vivida must recognize the value of unobstructed thermal outflows, and consider the condition of the forested habitat surrounding
springs with regard to its potential use as nocturnal roosts and dispersal corridors. Amphiagrion abbreviatum was confirmed breeding within Banff National Park, while no sign of breeding activity was recorded for Ischnura cervula. |
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Keywords: | Argia vivida Mark-recapture Odonata Population estimates Thermal springs Zygoptera |
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