Genetic diversity of the submerged macrophyte Hydrilla verticillata (L. f.) Royle in a river system in Japan

Limnology ◽  
2000 ◽  
Vol 1 (1) ◽  
pp. 27-31 ◽  
Author(s):  
T. Nakamura ◽  
Y. Kadono
Keyword(s):  
Genetic Diversity ◽  
Hydrilla Verticillata ◽  
River System ◽  
Submerged Macrophyte

scholarly journals Range reduction of the Oblong Rocksnail, Leptoxis compacta, shapes riverscape genetic patterns

2020 ◽  
Author(s):  
Aaliyah D. Wright ◽  
Nicole L. Garrison ◽  
Ashantye’ S. Williams ◽  
Paul D. Johnson ◽  
Nathan V. Whelan
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Human Impacts ◽  
Isolation By Distance ◽  
Extinction Risk ◽  
River System ◽  
High Genetic Diversity ◽  
Range Contraction ◽  
Genetic Patterns ◽  
Cahaba River

AbstractMany freshwater gastropod species face extinction, including 79% of species in the family Pleuroceridae. The Oblong Rocksnail, Leptoxis compacta, is a narrow range endemic pleurocerid from the Cahaba River basin in central Alabama that has seen rapid range contraction in the last 100 years. Such a decline is expected to negatively affect genetic diversity in the species. However, precise patterns of genetic variation and gene flow across the restricted range of L. compacta are unknown. This lack of information limits our understanding of human impacts on the Cahaba River system and Pleuroceridae. Here, we show that L. compacta has likely seen a species-wide decline in genetic diversity, but remaining populations have relatively high genetic diversity. We also report a contemporary range extension compared to the last published survey. Leptoxis compacta does not display an isolation by distance pattern, contrasting patterns seen in many riverine taxa. Our findings also indicate that historical range contraction has resulted in the absence of common genetic patterns seen in many riverine taxa like isolation by distance as the small distribution of L. compacta allows for relatively unrestricted gene flow across its remaining range despite limited dispersal abilities. Two collection sites had higher genetic diversity than others, and broodstock sites for future captive propagation and reintroduction efforts should utilize sites identified here as having the highest genetic diversity. Broadly, our results support the hypothesis that range contraction will result in the reduction of species-wide genetic diversity, and common riverscape genetic patterns cannot be assumed to be present in species facing extinction risk.

scholarly journals Range reduction of Oblong Rocksnail, Leptoxis compacta, shapes riverscape genetic patterns

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9789
Author(s):  
Aaliyah D. Wright ◽  
Nicole L. Garrison ◽  
Ashantye’ S. Williams ◽  
Paul D. Johnson ◽  
Nathan V. Whelan
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Human Impacts ◽  
Isolation By Distance ◽  
Extinction Risk ◽  
River System ◽  
High Genetic Diversity ◽  
Range Contraction ◽  
Genetic Patterns ◽  
Cahaba River

Many freshwater gastropod species face extinction, including 79% of species in the family Pleuroceridae. The Oblong Rocksnail, Leptoxis compacta, is a narrow range endemic pleurocerid from the Cahaba River basin in central Alabama that has seen rapid range contraction in the last 100 years. Such a decline is expected to negatively affect genetic diversity in the species. However, precise patterns of genetic variation and gene flow across the restricted range of L. compacta are unknown. This lack of information limits our understanding of human impacts on the Cahaba River system and Pleuroceridae. Here, we show that L. compacta has likely seen a species-wide decline in genetic diversity, but remaining populations have relatively high genetic diversity. We also report a contemporary range extension compared to the last published survey. Our findings indicate that historical range contraction has resulted in the absence of common genetic patterns seen in many riverine taxa like isolation by distance as the small distribution of L. compacta allows for relatively unrestricted gene flow across its remaining range despite limited dispersal abilities. Two collection sites had higher genetic diversity than others, and broodstock sites for future captive propagation and reintroduction efforts should utilize sites identified here as having the highest genetic diversity. Broadly, our results support the hypothesis that range contraction will result in the reduction of species-wide genetic diversity, and common riverscape genetic patterns cannot be assumed to be present in species facing extinction risk.

Effects of pH on the Submerged Macrophyte Hydrilla verticillata

2018 ◽  
Vol 65 (4) ◽  
pp. 611-619 ◽  
Author(s):  
Y. Song ◽  
X. -J. He ◽  
M. Chen ◽  
L. -L. Zhang ◽  
J. Li ◽  
...  
Keyword(s):  
Hydrilla Verticillata ◽  
Submerged Macrophyte ◽  
Effects Of Ph

Equilibrium Uptake and Bioaccumulation of Basic Violet 14 Using Submerged Macrophyte Hydrilla verticillata

2011 ◽  
Vol 39 (3) ◽  
pp. 283-288 ◽  
Author(s):  
Gopalakrishnan Saranya ◽  
Panneerselvam Saravanan ◽  
Mahendradas Dharmendira Kumar ◽  
Sahadevan Renganathan
Keyword(s):  
Hydrilla Verticillata ◽  
Submerged Macrophyte

scholarly journals What Has Happened to the Atlantic Salmon?

Oryx ◽  
1981 ◽  
Vol 16 (2) ◽  
pp. 157-160
Author(s):  
Alwyne Wheeler
Keyword(s):  
Genetic Diversity ◽  
Natural History ◽  
Atlantic Salmon ◽  
River System ◽  
British Museum ◽  
Fish Group

Because they must migrate up to the headwaters of rivers to spawn, salmon were badly affected when man developed the rivers for navigation and industry, then polluted them and, for hydroelectric schemes, sometimes blocked them. The final disaster was the Greenland fishery that started in the early 1960s. This has now been controlled, but the Atlantic salmon is unlikely to recover its former numbers. Moreover, some of the unique stocks that each river system originally had have been exterminated and others adulterated, so that the Atlantic salmon's original genetic diversity has been irretrievably destroyed. The author, who works on fishes at the British Museum, Natural History, is Chairman of IUCN's SSC Fish Group.

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