Freshwater mussel records collected by the Maryland Department of ...

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In 2009, A. heterodon was collected at four sites (Table 1). Since 1995, they have been encountered 19 times at 11 sites, primarily in the Corsica River watershed (Figure 2). A single confirmed host fish (Etheostoma olmstedi) was commonly collected at sites where A. heterodon was also present (Table 2). Two additional known hosts (Fundulus diaphanus and Percina peltata) were rarely collected throughout the range of A. heterodon in Maryland. Congenerics of other confirmed host fish were also infrequent. Two fish species (Lepomis gibossus and Semotilus corporalis) previously identified as hosts of other Alasmidonta spp. were also common at sites with A. heterodon. The distribution and means of many variables examined were similar where A. heterodon was present (N = 27) and absent (N = 60) (Figure 3). The pH and specific conductance of sites with A. heterodon was higher than sites without; however, they were present at sites with higher chloride levels. They were also primarily collected in streams with total nitrogen and nitrate concentrations
Table 2. Frequency of occurrence for fishes collected at sites throughout the range of A. heterodon (AH) in Maryland. Non-native fishes are indicated with an asterisk (*). Confirmed fish hosts Frequency of occurrence AH Present N=32 AH Absent N=109 Cottus bairdi Mottled sculpin 0.00 0.00 Etheostoma nigrum Johnny darter 0.00 0.00 Etheostoma olmstedi Tessellated darter 0.90 0.72 Fundulus diaphanus Banded killifish 0.00 0.05 Morone saxatalis Striped bass 0.00 0.00 Percina peltata Shield darter 0.00 0.01 Salmo trutta* Brown trout 0.00 0.00 Congenerics of confirmed fish hosts Cottus caeruleumentum Blue Ridge sculpin 0.00 0.00 Morone americana White perch 0.00 0.02 Confirmed hosts of congeneric mussels Catostomus commersoni White sucker 0.32 0.21 Hypentelium nigricans Northern hogsucker 0.00 0.00 Gambusia holbrooki Eastern mosquitofish 0.19 0.08 Lepomis gibbosus Pumpkinseed 0.77 0.49 Micropterus salmoides* Largemouth bass 0.35 0.26 Notemigonus chrysoleucas Golden shiner 0.19 0.34 Noturus insignis Margined madtom 0.32 0.24 Semotilus corporalis Fallfish 0.68 0.27 Perca flavescens Yellow perch 0.03 0.07 9
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Page 6 and 7: List of Figures Figure Number Page
Page 8 and 9: List of Tables Table Number Page 1.
Page 11 and 12: INTRODUCTION The diversity of fresh
Page 13 and 14: species richness, host abundance, a
Page 15: Table 1. Number of sites sampled by
Page 19 and 20: Figure 3. continued A P A P A P p =
Page 21 and 22: Figure 3. continued A P A P A P 0 5
Page 23 and 24: Since 2007, A. undulata Say 1817 ha
Page 25 and 26: Anodonta implicata Say 1829 was enc
Page 27 and 28: Table 3. Frequency of occurrence fo
Page 29 and 30: Figure 8. continued A P A P A P p =
Page 31 and 32: Figure 8. continued A P A P A P 0 5
Page 33 and 34: In 2009, E. fisheriana was collecte
Page 35 and 36: Figure 10. Box-and-whisker plots of
Page 37 and 38: Figure 10. continued. A P A P A P 0
Page 39 and 40: Figure 10. continued A P A P A P 0
Page 41 and 42: Elliptio producta Conrad 1836 has p
Page 43 and 44: Lampsilis radiata radiata Gmelin 17
Page 45 and 46: Leptodea ochracea Say 1817 has been
Page 47 and 48: Pyganodon cataracta had previously
Page 49 and 50: Figure 19. Box-and-whisker plots of
Page 55 and 56: Corbicula fluminea is a non-native
Page 57 and 58: (Black 2001, Wang 2007b). A lack of
Page 59 and 60: Maryland (Cummings and Watters 2009
Page 61 and 62: REFERENCES Allan, J.D., & A.S. Flec
Page 63 and 64: Kelly, M.W., & J.M. Rhymer. 2005. P
Page 65 and 66: ——. 1999a. Effects of alien spe
Page 67 and 68:
Young, D. 1911. The implantation of
Page 70 and 71:
8-digit watershed Number 8-digit wa
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