Howells Freshwater Mussels App

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BASIC MUSSEL BIOLOGY• <strong>Freshwater</strong> mussel juveniles and adults dig into thesubstrate. They do not attach to solid objects with byssalthreads as do marine mussels and zebra mussels mussels.• Movement is usually limited to crawling short distances.• Adults and older juveniles filter feed on plankton, bacteria,and organic material in the water column and possibly thesubstrate.
GENERAL FRESHWATER MUSSEL HABITAT• Unionids in Texas may occur in lakes,reservoirs, ponds, streams, & riverswith bottoms of mud, clay, stablesand, gravel, & mixtures of these(some are habitat specific).• Often types of unacceptable habitatsare more important aspects ofdistribution.• Unacceptable habitat includes:– Deep shifting sand– Deep soft silt– Scoured cobble and bedrock– Severe long-term dewatering(drought or drawdown)– Dramatically fluctuating water levels– Dense aquatic plant beds or rafts– Substrates covered with leaves& sticks, etc.• Unacceptable habitat – cont.– Low-quality pollutedwaters– Saline waters– Lack of host fishes– Headwater springs– Impounded waters(some species)
Page 1 and 2: THE ECOLOGY OF FRESHWATER MUSSELS:S
Page 3 and 4: TERMINOLOGY - WHAT IS A MUSSEL?•
Page 5: FRESHWATER MUSSEL INTRODUCTION• F
Page 9 and 10: IMPORTANCE IN THE AQUATIC ECOSYSTEM
Page 11 and 12: REPRODUCTIVE BIOLOGY - I• Sperm i
Page 13 and 14: REPRODUCTIVE BIOLOGY - IIIFemale mu
Page 15 and 16: MUSSEL SPECIES DIVERSITY - II• By
Page 17 and 18: DIVERSITY MEANS STABILITY!!!• The
Page 19 and 20: MAJOR REASONS FOR TEXAS MUSSEL DECL
Page 21 and 22: MAJOR REASONS FOR TEXAS MUSSEL DECL
Page 23 and 24: MINIMAL AND NON-REASONS FOR TEXASMU
Page 25 and 26: FUTURE THREATS TO TEXAS MUSSELS•
Page 27 and 28: THREATENED AND ENDANGERED SPECIES
Page 29 and 30: OUACHITA ROCK-POCKETBOOKArkansia wh
Page 31 and 32: TRIANGLE PIGTOE (Fusconaia lananens
Page 33 and 34: SANDBANK POCKETBOOK (Lampsilis satu
Page 35 and 36: LOUISIANA PIGTOE (Pleurobema riddel
Page 37 and 38: TEXAS HEELSPLITTER (Potamilus amphi
Page 39 and 40: GOLDEN ORB (Quadrula aurea)Threaten
Page 41 and 42: FALSE SPIKE (Quadrula mitchelli)Thr
Page 43 and 44: MEXICAN FAWNSFOOT (Truncilla cognat
Page 45 and 46: ADDITIONAL RARE MUSSELS IN TEXAS- A
Page 47 and 48: INFORMATION ON TEXAS MUSSELS• Fre

Howells Freshwater Mussels App

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