Translator Disclaimer
1 June 2009 Note on Mortality of the Emerging Stonefly Pteronarcys californica on the Jocko River, Montana, USA
Author Affiliations +
Abstract

Cold air temperatures may have killed several emerging nymphs and adult Pteronarcys californica on the Jocko River, Montana. Some aquatic insect taxa emerge early on the Jocko River, likely due to warm water temperatures in winter and spring. At this location, P. californica emerges approximately 5–7 weeks earlier than it does on many other streams or rivers across the United States. We hypothesize that this earlier emergence may be a mortality factor when cold fronts cause air temperatures to drop below freezing. Other mortality factors are also discussed.

© 2009
Isaac P. Rockwell and Robert L. Newell "Note on Mortality of the Emerging Stonefly Pteronarcys californica on the Jocko River, Montana, USA," Western North American Naturalist 69(2), 264-266, (1 June 2009). https://doi.org/10.3398/064.069.0218
Received: 19 June 2008; Accepted: 1 December 2008; Published: 1 June 2009
JOURNAL ARTICLE
3 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top