Remington (1968) argued that 13 suture zones exist in North America. Remington defined a suture z... more Remington (1968) argued that 13 suture zones exist in North America. Remington defined a suture zone as, "a band of geographic overlap between major biotic assemblages, including some pairs of species or semispecies which hybridize in the zone" (p. 322). Although initially controversial, the idea that suture zones exist has picked up momentum over the past decade, due largely to the phylogeographic work of Hewitt, Avise, and their colleagues. Nevertheless, the reality of suture zones has not yet been subjected to rigorous analysis using statistical and geographic information system (GIS) approaches. To test for the existence of Remington's suture zones, we first identified 117 terrestrial hybrid zones in Canada and the United States through a literature search for the key words "cline," "contact zone," "hybrid zone," and "hybridization" in articles published between 1970 and 2002. The 117 hybrid zones were mapped using a GIS approach and compared with a digitized version of Remington's original suture zone map. Overall, there does appear to be an association between hybrid zones and suture zones, but this association is largely attributable to clustering of hybrid zones in only two of the 13 suture zones recognized by Remington. The results suggest that evolutionary biologists should retain some skepticism toward Remington's suture zones.
... HOWARD, SETH C. BRITCH, W. EVAN BRASWELL Department of Biology, New Mexico State University, ... more ... HOWARD, SETH C. BRITCH, W. EVAN BRASWELL Department of Biology, New Mexico State University, Las Cruces JEREMY L. MARSHALL Department of ... Stebbins and Daly 1961, Levin 1963, Thaeler 1968, Gill and Murray 1972, Blackwell and Bull 1978, Woodruff 1979). ...
... This question is of vital importance in the light of suggestions that bacteria represent an i... more ... This question is of vital importance in the light of suggestions that bacteria represent an important food for te-phritids (Drew et al. 1983, Drew & Lloyd 1987) and that bacteria may help to mediate host shifts in Rhagoletis (Howard et al. 1985). As noted earlier (Howard et al. ...
Page 1. Electrophoretic Survey of Eastern North American Allonemobius (Orthoptera: Gryllidae): Ev... more Page 1. Electrophoretic Survey of Eastern North American Allonemobius (Orthoptera: Gryllidae): Evolutionary Relationships and the Discovery of Three New Species 1 DANIEL J. HOWARD2 Department of Biology, Yale University, PO Box 6666, New Haven, Connecticut 06511 ...
Remington (1968) argued that 13 suture zones exist in North America. Remington defined a suture z... more Remington (1968) argued that 13 suture zones exist in North America. Remington defined a suture zone as, "a band of geographic overlap between major biotic assemblages, including some pairs of species or semispecies which hybridize in the zone" (p. 322). Although initially controversial, the idea that suture zones exist has picked up momentum over the past decade, due largely to the phylogeographic work of Hewitt, Avise, and their colleagues. Nevertheless, the reality of suture zones has not yet been subjected to rigorous analysis using statistical and geographic information system (GIS) approaches. To test for the existence of Remington's suture zones, we first identified 117 terrestrial hybrid zones in Canada and the United States through a literature search for the key words "cline," "contact zone," "hybrid zone," and "hybridization" in articles published between 1970 and 2002. The 117 hybrid zones were mapped using a GIS approach and compared with a digitized version of Remington's original suture zone map. Overall, there does appear to be an association between hybrid zones and suture zones, but this association is largely attributable to clustering of hybrid zones in only two of the 13 suture zones recognized by Remington. The results suggest that evolutionary biologists should retain some skepticism toward Remington's suture zones.
... HOWARD, SETH C. BRITCH, W. EVAN BRASWELL Department of Biology, New Mexico State University, ... more ... HOWARD, SETH C. BRITCH, W. EVAN BRASWELL Department of Biology, New Mexico State University, Las Cruces JEREMY L. MARSHALL Department of ... Stebbins and Daly 1961, Levin 1963, Thaeler 1968, Gill and Murray 1972, Blackwell and Bull 1978, Woodruff 1979). ...
... This question is of vital importance in the light of suggestions that bacteria represent an i... more ... This question is of vital importance in the light of suggestions that bacteria represent an important food for te-phritids (Drew et al. 1983, Drew & Lloyd 1987) and that bacteria may help to mediate host shifts in Rhagoletis (Howard et al. 1985). As noted earlier (Howard et al. ...
Page 1. Electrophoretic Survey of Eastern North American Allonemobius (Orthoptera: Gryllidae): Ev... more Page 1. Electrophoretic Survey of Eastern North American Allonemobius (Orthoptera: Gryllidae): Evolutionary Relationships and the Discovery of Three New Species 1 DANIEL J. HOWARD2 Department of Biology, Yale University, PO Box 6666, New Haven, Connecticut 06511 ...
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