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1 March 2012 The Distribution of Cordulegaster (Odonata: Cordulegastridae) Nymphs in Seeps and Springs of Nelson Swamp (Madison County, NY)
Barbara J. Hager, Nina J. Kalantari, Van A. Scholten
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Abstract

Given the presence of foraging and reproducing adult Cordulegaster (spiketail) dragonflies in Nelson Swamp (Madison County, NY), we examined nymph distribution and abundance in the seeps and springs found within the swamp. From 9 September–4 November 2010, we surveyed 8 sites along Chittenango Creek in order to determine: (1) the species present and their distribution/occurrence among sites, (2) factors influencing species presence and abundances, and (3) patterns in size and age distribution among and within sites. For sites, we delineated habitat zones (inlet, middle, outlet), determined the benthic substrate, and measured shoreline perimeters. For nymphs, we measured head width, body length, and wing pad length and identified some to species. The majority of spiketails we identified were Cordulegaster diastatops (Delta-spotted Spiketail); Cordulegaster maculata (Twin-spotted Spiketail) was also present. Most nymphs occurred in inlets with muck and cobble bottoms and in water depths less than 10 cm. Spiketail densities ranged from 0.13–8.13 individuals/m of shoreline. Smaller individuals occurred in cobble substrate, while muck substrates had individuals of larger size and greater abundance. We demarcated at least 2 age cohorts of nymphs based on their body measurements in relation to growth patterns observed in other spiketail species.

Barbara J. Hager, Nina J. Kalantari, and Van A. Scholten "The Distribution of Cordulegaster (Odonata: Cordulegastridae) Nymphs in Seeps and Springs of Nelson Swamp (Madison County, NY)," Northeastern Naturalist 19(sp6), 67-76, (1 March 2012). https://doi.org/10.1656/045.019.s605
Published: 1 March 2012
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