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Variation of Fish Assemblages and Species Abundances in The VARIATION OF FISH ASSEMBLAGES AND SPECIES ABUNDANCES IN THE UPPER FLINT RIVER SHOALS, GEORGIA by PAULA A. MARCINEK (Under the Direction of Mary C. Freeman) ABSTRACT The Flint River, a major tributary of the Apalachicola drainage, is one of four rivers originating in the Piedmont of central Georgia. This study investigated relations between fish assemblages and habitat characteristics in shoals, one of the primary features of the upper mainstem. The study compared variation in fish assemblages and species abundances among shoals at two scales, the microhabitat and the reach. Shoals differed in terms of species assemblages, habitat composition, and species abundances. Habitat use by fishes was predicted by different variables at the microhabitat and reach scales. The predictive variables were depth, velocity, Podostemum coverage, bed sediment variables, and gradient. These findings should be useful for management decisions and in evaluating consequences of municipal water policy in the Flint headwaters. INDEX WORDS: fish assemblages, Flint River, shoals, Cyprinella callitaenia, Micropterus cataractae, Percina sp. VARIATION OF FISH ASSEMBLAGES AND SPECIES ABUNDANCES IN THE UPPER FLINT RIVER SHOALS, GEORGIA by PAULA A. MARCINEK B.S. The University of Georgia, 1999 A Thesis Submitted to the Graduate Faculty of The University of Georgia in Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE ATHENS, GEORGIA 2003 © 2003 Paula A. Marcinek All Rights Reserved VARIATION OF FISH ASSEMBLAGES AND SPECIES ABUNDANCES IN THE UPPER FLINT RIVER SHOALS, GEORGIA by PAULA A. MARCINEK Major Professor: Mary C. Freeman Committee: Ronald Carroll Byron J. Freeman Electronic Version Approved: Maureen Grasso Dean of the Graduate School The University of Georgia August 2003 iv ACKNOWLEDGEMENTS Thank you to the U.S. Fish and Wildlife Service and Bud Freeman for funding. Thanks to all who helped me in the field and with data entry, and to my major professor who provided unwavering support and knowledge. v TABLE OF CONTENTS Page ACKNOWLEDGEMENTS............................................................................................iv LIST OF TABLES ........................................................................................................vii LIST OF FIGURES......................................................................................................viii CHAPTER 1 INTRODUCTION .........................................................................................1 2 STATUS AND CONSERVATION ISSUES OF AN UNDAMMED PIEDMONT RIVER..................................................................................3 Setting and Early History...........................................................................4 Large Dams on the Flint ............................................................................5 Flint River Shoals ......................................................................................7 Water Quality in the Flint River.................................................................9 Conservation Issues .................................................................................12 3 VARIATION IN FISH ASSEMBLAGES AND SPECIES ABUNDANCES IN THE SHOALS OF THE FLINT RIVER, GEORGIA..........................13 Introduction .............................................................................................13 Methods...................................................................................................14 Results.....................................................................................................19 vi Discussion ...............................................................................................24 4 CONCLUSIONS .........................................................................................31 REFERENCES CITED .................................................................................................33 APPENDICES ..............................................................................................................70 A FISHES CAUGHT IN 2001 B FISHES CAUGHT IN 2002 vii LIST OF TABLES Page Table 1: Habitat descriptions of the shoals.....................................................................36 Table 2: NMS correlations.............................................................................................39 Table 3: Comparison of past and present studies............................................................41 Table 4: Microhabitat descriptions of the fishes.............................................................43 Table 5: Logistic regression results................................................................................45 Table 6: Pearson correlations for habitat variables.........................................................48 Table 7: Pearson correlations for fishes .........................................................................50 Table 8: Multiple regression results...............................................................................52 viii LIST OF FIGURES Page Figure 1: Map of Study Reach.......................................................................................54 Figure 2: Map of 2001 sites...........................................................................................56 Figure 3: Map of the 2002 sites .....................................................................................58 Figure 4: CPUE of the water column fishes ...................................................................60 Figure 5: CPUE of the benthic fishes.............................................................................62 Figure 6: NMS ordination showing variation of shoals ..................................................64 Figure 7: NMS ordination of shoals overlaid with species .............................................66 Figure 8: NMS ordination of shoals overlaid with habitat variables ...............................68 1 CHAPTER 1 INTRODUCTION This study addressed the conservation status of one of the few remaining high quality, free-flowing rivers in the continental United States; the Flint River, a major tributary of the Apalachicola River drainage, is one of four rivers that originate in the Piedmont of central Georgia. It flows onto the Coastal Plain of southwest GA before it encounters the first of 3 mainstem impoundments. This approximately 322 km long undammed reach earned the Flint River national recognition as one of 42 unimpounded reaches >200km (Benke 1990). Since before the Clean Water Act, this river has long been affected by growth of Atlanta in its headwaters. The focus of water issues, such as municipal withdrawals and discharges along with a controversial dam proposal, have shaped the history of the river. As the metropolitan Atlanta area continues to grow, off-stream water demands in the headwaters of the Flint River are increasing. The upper Flint mainstem contains a reach of shoals, a series of shallow, swift, rocky habitats interspaced by long pools. In terms of fish assemblages and abundances of endemic species, the effects of urbanization from the Atlanta area have not reached the shoals of the upper Flint River. The focus of my study examined among shoal differences of fish assemblages and species abundances. This is the first attempt within 2 the past 17 years to investigate the fishes of the Flint River shoals. Specifically I investigated fish assemblages of the shoals and habitat associations of fishes endemic to this drainage at the microhabitat and reach scales. Chapter 2 reviews the recent history of the Flint River, beginning with the launch of human development. It then introduces shoals as biologically diverse and ecologically significant riverine habitats. I also introduce prevalent conservation issues for the upper Flint River. Chapter 3 reports an investigation of relations between fishes and habitat characteristics of the shoals reach. The study asks what habitat characteristics, at the microhabitat and the reach scales, influence fish assemblages and species abundances. In the final Chapter, I summarize the major findings of this work and discuss and compare what variables best predict species presence at the microhabitat and reach scales. I also discuss the management implications of this information. 3 CHAPTER 2 STATUS AND CONSERVATION ISSUES OF AN UNDAMMED PIEDMONT RIVER “The lore of the South could not survive without rivers any better than the human body could survive without blood… Yet it is the South, more than any region except California, that has become a landscape of reservoirs, and southerners, more than anyone else, are still at the grand old work of destroying their rivers.” -- Mark Reisner, 1986, Cadillac Desert Containing approximately 322 out of 565 kilometers of undammed water, the Flint River mainstem is one of the longest free-flowing rivers in Georgia. It is also one of 42 relatively undegraded rivers in the United States with greater than 200 km of unimpeded flow (Benke 1990). These facts along with many other aspects make the Flint an ecologically significant river in Georgia. I will first present an historical overview to describe how the Flint River has come to its present condition. One of the consequences of the Flint River having escaped large-scale impoundment is the retention of river shoal habitat, which I will also describe. Finally I will compare water quality in the river before and after implementation of the Clean Water Act. 4 Setting and Early History The headwaters
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