Changes in Freshwater Mussel Communities Linked to Legacy Pollution in the Lower Delaware River

2018 ◽  
Vol 25 (1) ◽  
pp. 101-116 ◽  
Author(s):  
Carrie J. Blakeslee ◽  
Erik L. Silldorff ◽  
Heather S. Galbraith
Keyword(s):  
Freshwater Mussel ◽  
Delaware River ◽  
Legacy Pollution

scholarly journals Population Demographics for the Federally Endangered Dwarf Wedgemussel

2016 ◽  
Vol 7 (2) ◽  
pp. 377-387 ◽  
Author(s):  
Heather S. Galbraith ◽  
William A. Lellis ◽  
Jeffrey C. Cole ◽  
Carrie J. Blakeslee ◽  
Barbara St. John White
Keyword(s):  
Aquatic Macrophytes ◽  
Size Structure ◽  
Freshwater Mussel ◽  
River Population ◽  
Delaware River ◽  
Population Demographics ◽  
Delaware Basin ◽  
Status Assessment ◽  
Term Monitoring

Abstract The dwarf wedgemussel Alasmidonta heterodon is a federally endangered freshwater mussel species inhabiting several Atlantic Slope rivers. Studies on population demographics of this species are necessary for status assessment and directing recovery efforts. We conducted qualitative and quantitative surveys for dwarf wedgemussel in the mainstem Delaware River and in four of its tributaries (Big Flat Brook, Little Flat Brook, Neversink River, and Paulinskill River). We quantified population range, relative abundance, size, size structure, and sex ratio within each river. We estimated total dwarf wedgemussel population size for the surveyed rivers in the Delaware Basin to be 14,432 individuals (90% confidence limits, 7,961–26,161). Our results suggest that the historically robust Neversink River population has declined, but that this population persists and substantial populations remain in other tributaries. Sex ratios were generally female-biased, and small individuals (<10 mm) found in all rivers indicate recent recruitment. We most often found dwarf wedgemussel at the surface of the sediment (not buried below) in shallow quadrats (<2.00 m) comprised of small substrate (sand in tributaries; cobble in the mainstem) and minimal aquatic macrophytes. Long-term monitoring, continued surveys for new populations, and assessments of reproductive success are needed to further understand dwarf wedgemussel viability within the Delaware River basin.

Freshwater Mussel (Batissa violacea) Fishery and its Value in Fiji

2019 ◽  
Vol 39 (1) ◽  
Author(s):  
Jimaima Lako ◽  
Nanise Kuridrani ◽  
Milika Sobey
Keyword(s):  
Value Chain ◽  
Environmental Conditions ◽  
Rural Women ◽  
Freshwater Mussel ◽  
Face To Face

This paper examines the local freshwater mussel, or kai (Batissa violacea), fishery value chain, its values and contribution to the livelihood of people in Viti Levu, Fiji. The assessment was performed through face-to-face interviews, with the use of semi-structured questionnaires administered to 125 actors. A walk through the value-chain was also conducted that confirmed the sites’ environmental conditions. Results revealed that even though the kai fishery is dominated by rural women, men were also employed as kai processors, transporting agents and exporters. This fishery generated at least 58 other employments through the 500 kai harvesters within the five major provinces understudy. These were drivers, boat builders, retailers, processors, exporters, and harvesters. Three sales pathways were identified that determined the revenues and profits: (i) harvesters sell own harvests directly to the consumer at the municipal markets, (ii) harvesters sell through intermediary traders to consumers, and (iii) harvesters sell through processors to supermarkets, hotels or exporters. When revenues and profits were calculated, harvesters earned much less, compared to intermediary traders, processors, and exporters. Major constraints include continuous reduction in catch size of kai, lack of transport, and marketing at the local municipal markets that require improvements.

Atrazine Concentrations in the Delaware River, Kansas

Fact Sheet ◽  
1995 ◽  
Author(s):  
John K. Stamer ◽  
Kathryn D. Gunderson ◽  
Barbara J. Ryan
Keyword(s):  
Delaware River

Report of the River Master of the Delaware River for the Period December 1, 1999 - November 30, 2000

2003 ◽  
Author(s):  
Bruce E. Krejmas ◽  
Gary N. Paulachok ◽  
William J. Carswell
Keyword(s):  
Delaware River

Report of the River Master of the Delaware River for the Period December 1, 2003-November 30, 2004

2009 ◽  
Author(s):  
Bruce E. Krejmas ◽  
Gary N. Paulachok ◽  
Stephen F. Blanchard
Keyword(s):  
Delaware River
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