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We examined the biogeography of aquatic and semiaquatic Heteroptera (ASH) in the Grand Canyon (GC) ecoregion (GCE) on and adjacent to the southern Colorado Plateau. We report 89 ASH taxa in 86 species, 37 genera, and 14 families in the GCE, including 54 ASH taxa detected within or on the rims of GC and its major tributaries, a fauna 3.8-fold greater than previously reported. We tested 2 groups of biogeographic hypotheses to account for this high level of diversity, demonstrating an underlying pattern of mixed biogeographic affinity and strong landform-climate effects. Equal numbers of ASH taxa were derived from allochthonous (neotropical and nearctic) sources and autochthonous (range-centered) sources. A negative...
View east toward flood-damaged travertine pools below Havasu Falls, Havasu Creek, Cataract Canyon.
View north toward basalt dike (photograph EI10) in Hakatai Shale, Unkar Group, on north side of river mile 77.2, at beginning of Hance Rapids. Shinumo Sandstone forms cliff at upper edge of photograph.
View east and upriver toward Unkar Group of rocks, Cardenas Basalt sill (black), Bass Formation (light gray), Hakatai Shale (red), unconformably below overlying Cambrian Tapeats Sandstone, from south side of river mile 134.8.
EL03. Aerial view west toward numerous Pleistocene landslides partly covered by younger sand dunes along Vermilion Cliffs
Aerial view west toward numerous Pleistocene landslides partly covered by younger sand dunes along Vermilion Cliffs, just west of Vermilion Cliffs Lodge, Arizona (center of photograph), about 4 miles west of river mile 7.0. Red and white Navajo Sandstone forms upper half of Vermilion Cliffs, gray Kaibab Formation at lower left of photograph.
EI07. Aerial view northwest toward basalt dikes on west side of Unkar Creek canyon in Solomon Temple Member of Dox Formation
Aerial view northwest toward basalt dikes (photograph EI06) on west side of Unkar Creek canyon in Solomon Temple Member of Dox Formation, Unkar Group, about 2 miles west of river mile 72.5.
View upriver toward west wall of Grand Canyon from river mile 272.0. Muav Limestone at river (Lake Mead) level to Pakoon Limestone/Esplanade Sandstone at skyline.
CI07. Aerial view north toward south side of Quaternary basalt neck and pyroclastic deposits of Yumtheska Vent West sample site
Aerial view north toward south side of Quaternary basalt neck and pyroclastic deposits of Yumtheska Vent West sample site, K-Ar age 0.780±0.15 thousand years (ka) (Wenrich and others, 1995).
Cheyava Falls in flood, about a 450- to 500-foot waterfall, issuing from cave in Mooney Falls Member of Redwall Limestone, east wall of upper Clear Creek canyon.
Aerial view east toward Prospect Point breccia pipe, black breccia in bleached zone of upper Hermit Formation, northwest side of Prospect Point (uranium prospects).
View north toward Tassi Spring and Ranch in Pigeon Wash in Miocene strata of the Grand Wash trough, just west of Wheeler Fault.
Havasu Falls in flood, Cataract Canyon.
Aerial view southeast toward Fern Glen Arch in Mooney Falls Member of Redwall Limestone, east side of Fern Glen Canyon, north side of river mile 168.5.
Stantons cave in Redwall Limestone, Marble Canyon, west wall of river mile 32.0.
Aerial view east into Squaw Canyon, lower Grand Wash Cliffs. Mississippian and Pennsylvanian strata.
CA05. View east and downstream through Keyhole Natural Bridge toward Hundred and Forty Mile Canyon in Redwall Limestone
View east and downstream through Keyhole Natural Bridge toward Hundred and Forty Mile Canyon in Redwall Limestone, about 1 mile south of river mile 141.3.
Aerial view west toward Snyder copper mine breccia pipe in Watahomigi Formation.
View west and downriver from river mile 45.0 toward Triple Alcoves, a cave in lower part of Redwall Limestone (below white salt stain), Marble Canyon.
Aerial view northeast toward Malgosa Canyon breccia pipe at top of Redwall Limestone, just east of Malgosa Canyon on east side of river mile 58.0.