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26 February 2019 Nymph Ecology, Habitat, and Emergence-Site Selection of Cordulegaster erronea Hagen (Tiger Spiketail Dragonfly) in New Jersey with Implications for Conservation
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Abstract

Cordulegaster erronea (Tiger Spiketail) is of conservation concern throughout much of its range; yet only a single study on the nymphs has been conducted, and many aspects of the species’ life-history are poorly understood. The present study evaluated the size, age structure, and density of Tiger Spiketail nymphs at a stream on the Schiff Reservation Natural Lands Trust (Schiff) in Mendham Township, Morris County, NJ. We investigated the habitat and surrounding landscape characteristics of this stream and a second stream containing Tiger Spiketails at Schiff. We collected and measured 137 Tiger Spiketail nymphs during this study—82 in the spring and 55 in the fall—representing pre- and postadult emergence. We found 24 exuviae along both study streams and an additional 8 exuviae along 3 other streams in New Jersey, Connecticut, and Delaware. We are aware of only 1 other published report of Tiger Spiketail exuvia, which documented a single specimen. Our data and habitat assessment indicate that the Tiger Spiketail has a long nymphal stage and may be dependent upon high quality, fish-free, perennial headwater streams flowing through extensive forests. This information may assist resource managers in developing conservation strategies and habitat-protection measures for this species.

David Moskowitz and Michael L. May "Nymph Ecology, Habitat, and Emergence-Site Selection of Cordulegaster erronea Hagen (Tiger Spiketail Dragonfly) in New Jersey with Implications for Conservation," Northeastern Naturalist 26(1), 141-154, (26 February 2019). https://doi.org/10.1656/045.026.0113
Published: 26 February 2019
JOURNAL ARTICLE
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