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

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The status of L. cariosa in Maryland is currently unknown. Lampsilis cardium Rafinesque 1820, a species native to the greater Mississippi River basin, was introduced into the Potomac River in the early 1900s (Ortmann 1912). It is believed that L. cardium can hybridize with L. cariosa (Kelly and Rhymer 2005) and may have displaced L. cariosa throughout its historic range in Maryland (Strayer 1999a). Furthermore, it has proven difficult to diagnose these specimens in the field because their periostracums are often heavily weathered or specimens exhibit characteristics of both L. cariosa and L. cardium. As a result, specimens exhibiting characteristics of either species are designated as Lampsilis sp. Since 1995, Lampsilis sp. has been collected 25 times from 19 sites within the Middle and Upper Potomac drainages (Figure 13). In 2009, Lampsilis sp. was collected at 10 sites; four of these represent new localities (Table 1). Investigating the environmental conditions found coincident with Lampsilis sp. was not possible because their collections usually occurred incidentally. Figure 13. Locations where Lampsilis sp. was collected. 34
Lampsilis radiata radiata Gmelin 1791 has previously been encountered in three 8-digit watersheds, of which a majority came from sites in tidally-influenced locations which are not well surveyed for freshwater mussels. In 2009, we collected live L. r. radiata at a location in the Potomac River downstream of Marshall Hall where we also observed them in 2008 (Figure 14). Figure 14. Locations where L. r. radiata (eastern lampmussel) was collected. 35
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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 and 16: Table 1. Number of sites sampled by
Page 17 and 18: Table 2. Frequency of occurrence fo
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: Elliptio producta Conrad 1836 has p
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

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

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