Climate change and evolution of the New World pitviper genus Agkistrodon (Viperidae)

  title={Climate change and evolution of the New World pitviper genus Agkistrodon (Viperidae)},
  author={Michael E. Douglas and Marlis R. Douglas and Gordon W. Schuett and Louis W. Porras},
  journal={Journal of Biogeography},
Aim  We derived phylogenies, phylogeographies, and population demographies for two North American pitvipers, Agkistrodon contortrix (Linnaeus, 1766) and A. piscivorus (Lacépède, 1789) (Viperidae: Crotalinae), as a mechanism to evaluate the impact of rapid climatic change on these taxa. 

Phylogeography of Agkistrodon piscivorus with Emphasis on the Western Limit of Its Range

It is concluded that it is possible Texas and Florida served as refugia for A. piscivorus during the last glacial maximum, and, as the glaciers receded, the two populations expanded, coming into secondary contact.

Relictual Hybridization and Biogeography of Massasauga Rattlesnakes (Sistrurus spp.)

Historic contact zones for Massasaugas (Viperidae; Sistrurus spp.) within two distinct North American regions are dissected using ddRAD sequencing to illustrate how abrupt climate change has driven ancestral hybridization, cryptic diversity, and range dynamism within SistRurus.

Taxonomic hypotheses and the biogeography of speciation in the Tiger Whiptail complex (Aspidoscelis tigris: Squamata, Teiidae)

The results for the Tiger Whiptail complex broaden and extend the context within which polytypic species are conserved and managed, particularly those that reflect an incongruence among molecular and morphological standards.

Taxonomic reassessment and conservation status of the beaded lizard, Heloderma horridum (Squamata: Helodermatidae)

The taxonomy of beaded lizards is reassessed utilizing a recent DNA-based phylogenetic analysis, and morphology is incorporated by performing a character mapping analysis, which explores beaded lizard diversification against a backdrop of the origin, diversifica- tion, and expansion of seasonally dry tropical forests in Mexico and Guatemala.

Colour-polymorphic snake species are older

It is demonstrated that the presence of intraspecific colour polymorphism is correlated with the age of a species, with polymorphic snake species being significantly older than monomorphic species.

Population Genetics, Distributions and Phenology of Bombus Latreille, 1802 and Xylocopa Latreille, 1802 (Hymenoptera:Apidae)

A comparison of Arkansas bumble bee records mirrors range-wide surveys, with records of stable species increasing threefold, and records of the declining B. impatiens dropping to 60% of historical levels, but nationally-recommended conservation-genetics tools did not mirror these results on a regional level.

Diversification Across a Dynamic Landscape: Phylogeography and Riverscape Genetics of Speckled Dace (Rhinichthys osculus) in Western North America

Evolution occurs at various spatial and temporal scales. For example, speciation may occur in historic time, whereas localized adaptation is more contemporary. Each is required to identify and manage

The Spatial and Reproductive Ecology of the Copperhead (Agkistrodon contortrix) at the Northeastern Extreme of Its Range

In both sexes, shifts in habitat associations during the active season included migrations from over-wintering sites within basalt trap rockslides to upper-elevation, open deciduous forest during the summer foraging and reproductive season.

Population Genetics of the Copperhead at Its Most Northeastern Distribution

Values for genetic structure, diversity, and effective population size are similar to those reported for populations of North American Crotalus and Sistrurus, however, the study population did not sustain a genetic bottleneck following recent anthropogenic habitat alterations, and this may reflect a potential resilience to environmental change.



Quaternary Refugia and Persistence of Biodiversity

Work (Tzedakiset al.) that illustrates the importance of southern refugia for the persistence of some temperate tree species during the last glacial-interglacial cycles is described, and interdisciplinary efforts to identify other putative refugias could be important in long-term conservation planning.

Fossil snakes of North America : origin, evolution, distribution, paleoecology

  • J. Holman
  • Geography, Environmental Science
  • 2000
This work aims to provide a systematic account of the distribution of fossils in the fossil record over geological time periods and aims to clarify the evolutionary and zoogeographic patterns followed by an explanation of their distribution.

Freshwater paths across the ocean : molecular phylogeny of the frog Ptychadena newtoni gives insights into amphibian colonization of oceanic islands

A synergy of rafting, favourable surface currents and a reduction in salinity of surface waters could allow freshwater paths to open far enough to enable continental flora and fauna to reach these and other isolated oceanic islands.

Phylogeny of the Colubroidea (Serpentes): new evidence from mitochondrial and nuclear genes.

Phylogeography of the salamander genus Pseudobranchus in the southeastern United States.

Earliest Fossil Record of a Pigmy Rattlesnake (Viperidae: Sistrurus Garman)

The earliest fossil record of a Pigmy Rattlesnake (Sistrurus) on the basis of a trunk vertebra from the Late Miocene (Clarendonian NALMA) Pratt Slide local fauna of Nebraska suggests the genus has been present on the central Great Plains for at least five million years.

Phylogeography of the pitviper clade Agkistrodon: historical ecology, species status, and conservation of cantils

The historical ecology of the New World pitviper clade Agkistrodon is investigated, with emphasis on the disjunct subspecies of the cantil, A. bilineatus, and Taylor’s cantil is elevated to species status based on phylogenetic relationships, morphological and molecular divergence, and allopatry.


▪ Abstract Geographic patterns in mtDNA variation are compiled for 22 species of freshwater and terrestrial turtles in the southeastern United States, and the results are employed to evaluate

Hopping Hotspots: Global Shifts in Marine Biodiversity

The antiquity of the taxa in the modern Indo-Australian Archipelago hotspot emphasizes the role of pre-Pleistocene events in shaping modern diversity patterns.

Comparative molecular phylogeography of North American softshell turtles (Apalone): implications for regional and wide-scale historical evolutionary forces.

A comparative analysis of partial cytochrome b sequences is used to evaluate the evolutionary forces shaping wide-scale phylogeographic patterns of all three North American softshell turtles, resolving a novel, shared genetic break between northern-western and southeastern populations within both A. mutica and A. spinifera.