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Paul D. Johnson
Researcher at Alabama Department of Conservation and Natural Resources
Publications - 24
Citations - 564
Paul D. Johnson is an academic researcher from Alabama Department of Conservation and Natural Resources. The author has contributed to research in topics: Threatened species & Pleuroceridae. The author has an hindex of 11, co-authored 24 publications receiving 452 citations. Previous affiliations of Paul D. Johnson include Louisiana State University.
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Journal ArticleDOI
Conservation Status of Freshwater Gastropods of Canada and the United States
Paul D. Johnson,Arthur E. Bogan,Kenneth M. Brown,Noel M. Burkhead,James R. Cordeiro,Jeffrey T. Garner,Paul D. Hartfield,Dwayne A. W. Lepitzki,Gerry L. Mackie,Eva Pip,Thomas A. Tarpley,Jeremy S. Tiemann,Nathan V. Whelan,Ellen E. Strong +13 more
TL;DR: Comparison of modern to background extinction rates reveals that gastropods have the highest modern extinction rate yet observed, 9,539 times greater than background rates.
Journal ArticleDOI
The importance of microhabitat factors and habitat stability to the threatened Louisiana pearl shell, Margaritifera hembeli (Conrad)
Paul D. Johnson,Kenneth M. Brown +1 more
TL;DR: A discriminant analysis indicated that mussel density was related to water depth, substrate size, substrate compaction, and water velocity, and that mussels were rare in deep, stagnant pools with silt-covered bottoms and were more common in shallow, wide areas of streams with higher current velocities.
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The conservation status of the world’s freshwater molluscs
Monika Böhm,Nadia I. Dewhurst-Richman,Nadia I. Dewhurst-Richman,Mary Seddon,Sophie E.H. Ledger,Christian Albrecht,David Allen,Arthur E. Bogan,Jay Cordeiro,Jay Cordeiro,Kevin S. Cummings,Annabelle Cuttelod,Gustavo Darrigran,Will Darwall,Zoltán Fehér,Claudine Gibson,Daniel L. Graf,Frank Köhler,Manuel Lopes-Lima,Guido Pastorino,Kathryn E. Perez,Kevin M. Smith,Dirk Van Damme,Maxim V. Vinarski,Ted von Proschwitz,Ted von Proschwitz,Thomas von Rintelen,David C. Aldridge,Neelavar Anantharam Aravind,Prem Bahadur Budha,Cristhian Clavijo,Do Van Tu,Olivier Gargominy,Mohamed Ghamizi,Martin Haase,Craig Hilton-Taylor,Paul D. Johnson,Ümit Kebapçi,Jasna Lajtner,Charles N. Lange,Dwayne A. W. Lepitzki,Alberto Martínez-Ortí,Evelyn Moorkens,Eike Neubert,Eike Neubert,Caroline M. Pollock,Vincent Prié,Canella Radea,Rina Ramírez,M. Ramos,Sonia Barbosa dos Santos,Rajko Slapnik,Mikhail O. Son,Anna-Sofie Stensgaard,Ben Collen +54 more
TL;DR: The authors in this article assessed the extinction risk of 1428 randomly selected freshwater molluscs using the IUCN Red List Categories and Criteria, as part of the Sampled Red List Index project.
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The role of current and light in explaining the habitat distribution of the lotic snail Elimia semicarinata (Say)
Paul D. Johnson,Kenneth M. Brown +1 more
TL;DR: The results suggest that adults may select flow refugia, while juveniles avoid them, and that pleurocerid population dynamics are influenced by current velocity directly by shear stress, or indirectly by effects of current velocity on periphyton biomass.
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Intraspecific life history variation in the threatened Louisiana pearlshell mussel,Margaritifera hembeli
Paul D. Johnson,Kenneth M. Brown +1 more
TL;DR: Considerable intraspecific variation in density, growth, size and age structure and shell morphology among several isolated populations of Margaritifera hembeli suggests that management strategies for this species should be stream-specific, with emphasis on ensuring long-term habitat stability.