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Movement, Habitat Use and Detection Probability of Bridle Shiner

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Movement, Habitat Use and Detection Probability of Bridle Shiner University of Connecticut OpenCommons@UConn Master's Theses University of Connecticut Graduate School 8-16-2012 Movement, Habitat Use and Detection Probability of Bridle Shiner Estimated by Patch Occupancy Modeling in a Connecticut Watershed Timothy Jensen University of Connecticut - Storrs, [email protected] Recommended Citation Jensen, Timothy, "Movement, Habitat Use and Detection Probability of Bridle Shiner Estimated by Patch Occupancy Modeling in a Connecticut Watershed" (2012). Master's Theses. 336. https://opencommons.uconn.edu/gs_theses/336 This work is brought to you for free and open access by the University of Connecticut Graduate School at OpenCommons@UConn. It has been accepted for inclusion in Master's Theses by an authorized administrator of OpenCommons@UConn. For more information, please contact [email protected]. Movement, Habitat Use and Detection Probability of Bridle Shiner Estimated by Patch Occupancy Modeling in a Connecticut Watershed Timothy A. Jensen B.S., Colorado State University, 2004 A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science at the University of Connecticut 2012 APPROV AL PAGE Master of Science Thesis Movement, Habitat Use and Detection Probability of Bridle Shiner Estimated by Patch Occupancy Modeling in a Connecticut Watershed Presented by Timothy A. Jensen, B.S. f1 Major Advisor ___-H=-'-------_C_ -L::!.'lA2....L_________ _ Jason C. Vokoun Associate Advisor If:I!tr ----T~r-a-cy-A1~.G~~ ~.-R~it~te~n-h-ou-s-e~~ ~- ·------- Associate Advisor ---~--,t6L-""&:-:::..<.L-------7c-'/---'g~;L--,.o~'------___________ N~ University of Connecticut 2012 11 Acknowledgements I would like to recognize several biologists with whom I had the pleasure of working during a relatively brief, yet influential, period of time: Tim Barry, Mike Humphreys, Gerry Leonard, Ed Machowski, Don Mysling, and Bob Orciari. In working with these biologists I gained the motivation to pursue a graduate degree in fisheries. I would also like to thank the Connecticut Department of Energy and Environmental Protection for funding this project through the State and Tribal Wildlife Grants Program. I am grateful for the field assistance of Zach Donais, Brad Feathers, Declan Gallagher, Kevin Job, Yoichiro Kanno, Lauren LeShane, Kareem McKenzie, Kelly O’Connor, Nick Pastore, Chris Perkins, Matt Punty, Anson Smigel, and Evan Tam. Access to survey sites would not have been possible without the willingness and cooperation of the Avalonia Land conservancy, the town of North Stonington (specifically, Nick Mullane and Bill Peterson), and the many private landowners in the vicinity of the Shunock River. iii TABLE OF CONTENTS ABSTRACT ......................................................................................................................v CHAPTER 1: Age, growth, and movement characteristics of bridle shiner .......................1 Introduction ..................................................................................................................... 1 Methods........................................................................................................................... 3 Results ............................................................................................................................. 6 Discussion ....................................................................................................................... 7 Tables and Figures ........................................................................................................ 11 CHAPTER 2: Evaluating habitat use of bridle shiner while accounting for imperfect detection: a multi-state patch occupancy approach ...................................17 Introduction ................................................................................................................... 17 Methods......................................................................................................................... 20 Results ........................................................................................................................... 26 Discussion ..................................................................................................................... 29 Tables and Figures ........................................................................................................ 39 CHAPTER 3: Investigating the role of a predatory fish on the distribution and habitat use of a rare minnow ........................................................................................52 Introduction ................................................................................................................... 52 Methods......................................................................................................................... 55 Results ........................................................................................................................... 60 Discussion ..................................................................................................................... 63 Tables and Figures ........................................................................................................ 70 LITERATURE CITED ......................................................................................................78 iv ABSTRACT The bridle shiner (Notropis bifrenatus) is one of the smallest members of the minnow family (Cyprinidae) and is believed to have once been an important prey item throughout its native range from eastern Canada down the coast to South Carolina in the USA. More recently, bridle shiner have reportedly declined through much of their native range and carry special designations from extirpated, state endangered, special concern, and regionally rare. In 2010, Connecticut listed bridle shiner as a species of special concern. Little is known about the mechanisms driving the progressive extirpation of bridle shiner, although habitat fragmentation and degradation have been generally attributed as the cause. Habitats that are associated with this species are typically difficult to sample using traditional methods, which may increase the rate of false absences. Because standard community surveys do not account for false absences it is unclear how much observed range reduction could be actual or perceived. My objectives were to estimate detection probability of bridle shiner, evaluate the importance of habitat on their distribution in a fourth order stream, and determine patterns of movement among habitat patches. I employed a repeated surveys design to estimate detection probability based on capture history and to draw inferences about sites where the species was never encountered. Bridle shiner were batch marked to evaluate among-patch movement distances and frequencies. Movement was infrequent (94.5% did not emigrate) and occurred over short distances (5-240m), demonstrating that this species likely has a small home range. Detection probabilities in 2010 and 2011 were generally high (̅=0.78, v =0.07) and increased from spring to fall. Detectability in 2011 was negatively associated with mean water velocity and positively associated with abundance. Areas that were occupied by bridle shiner in 2011 tended to have higher springtime macrophyte cover, stable flows over time, and were connected by short distances to similar areas. Among occupied patches, those with shallower mean depths supported bridle shiner in high abundance later in the year, which may be an indication of habitat that is important for recruitment and survival. Habitat use and detection probability were not influenced by the presence of a native predator, redfin pickerel (Esox americanus americanus). My findings suggest that false absences are not likely the cause of reported declines in Connecticut and that habitat degradation may be a leading cause of extirpations throughout the state. Conservation and restoration actions should recognize the importance of macrophyte growth early in the year and stable flows over time, but especially the degree of connectivity among suitable habitats. Because bridle shiner were found to move only short distances, patches that are separated by >300m may be considered isolated and thus more susceptible to extirpation. Hence, connectivity among suitable habitat patches may be particularly important for this species to persist. vi CHAPTER 1: Age, growth, and movement characteristics of bridle shiner Introduction The bridle shiner (Notropis bifrenatus) is one of the smallest members of Cyprinidae, rarely exceeding 60mm total length (Harrington 1948, Holm 2001). Bridle shiner are usually found in ponds and streams amongst aquatic vegetation in areas with little or no current. This species feeds primarily upon animal organisms that are found in the vicinity of aquatic vegetation, such as zooplankton and macroinvertebrates (Harrington 1948). Like other prey fishes (e.g., Rangeley and Kramer 1998, Snickars et al. 2004, Padial et al. 2009), the association of bridle shiner with densely vegetated areas may be due to antipredator behavior. In Connecticut, spawning occurs in June where bridle shiner select beds of submerged aquatic vegetation to serve as spawning sites (Webster 1941, Harrington 1947). Given their specialized habitat requirement for slow flowing, densely vegetated areas, bridle shiner are relegated to habitats such as a beaver pond, stream bend, swamp, or a low gradient reach of stream. Such habitats are manifested
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