Results 251 to 260 of about 23,755 (269)

Temporal diversification of Mesoamerican cichlid fishes across a major biogeographic boundary

Molecular Phylogenetics and Evolution, 2004
The Mexican Neovolcanic Plateau sharply divides the vertebrate fauna of Mesoamerica where the climate of both the neotropics and temperate North America gradually blend. Only a few vertebrate groups such as the Heroine cichlids, distributed from South America to the Rio Grande in North America, are found both north and south of the Neovolcanic Plateau.
C, Darrin Hulsey, Francisco J, García de León, Yara, Sánchez Johnson, Dean A, Hendrickson, Thomas J, Near   +4 more
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Rethinking the Palearctic-Oriental Biogeographic Boundary in Quaternary China

2010
This paper reviews the Chinese Quaternary biogeographic record, which has traditionally been divided into the Palearctic (North China) and Oriental (South China) biozones. Notable findings are: (1) Open-steppe taxa (e.g., Equus sanmeniensis, E. yunnanensis, E. hemonius, Mammuthus) are found in the Oriental region during the Early and Late Pleistocene; (
Christopher J. Norton, Changzhu Jin, Yuan Wang, Yingqi Zhang   +3 more
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Transition boundaries for protistan species turnover in hypersaline waters of different biogeographic regions

Environmental Microbiology, 2017
Summary The identification of environmental barriers which govern species distribution is a fundamental concern in ecology. Even though salt was previously identified as a major transition boundary for micro‐ and macroorganisms alike, the salinities causing species turnover in protistan communities are unknown.
Sabine, Filker, Dominik, Forster, Lea, Weinisch, Merit, Mora-Ruiz, Bernardo, González, María Eugenia, Farías, Ramon, Rosselló-Móra, Thorsten, Stoeck   +7 more
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Biogeographic control of trilobite mass extinction at an Upper Cambrian “biomere” boundary

Paleobiology, 1987
Extinctions at the top of the Sunwaptan Stage (=“Ptychaspid Biomere”) near the Cambrian-Ordovician boundary eliminated about half of North American trilobite families. The families that extend from the shelf into the upper slope show significantly higher survival than those confined to the shelf. Biofacies and lithofacies distribution patterns indicate
Stephen R. Westrop, Rolf Ludvigsen
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Biogeographical boundaries and Monmonier’s algorithm: a case study in the northern Neotropics

Journal of Biogeography, 2007
AbstractAim To use Monmonier’s algorithm, a spatially explicit technique, to elucidate positions of biogeographical boundaries in the northern Neotropics.Location The northern Neotropics (Isthmus of Tehuantepec, Mexico, south to trans‐Andean Colombia).Methods We compiled avifaunal lists for 36 forested sites from the literature, museum records, field ...
Michael A. Patten, Brenda D. Smith‐Patten   +1 more
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Early Cambrian provincialism and biogeographic boundaries in the North Atlantic region

Lethaia, 1979
Early Cambrian lithofacies and their stratigraphic context, characteristic of a number of tectonic elements within the North Atlantic region, are interpreted with respect to depositional environment and related trilobite provincialism. Faunas of the North American province are typically indigenous to shallow, warm water on a sand-carbonate shelf on the
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Genetic variation and biogeographical boundaries within the red alga Porphyra umbilicalis (Bangiales, Rhodophyta)

Botanica Marina, 2010
Information about past periods of climate change can provide a framework for investigating how marine communities may have adapted to changes both geographically and ecologically. The spatial distribution of variable haplotypes from the nuclear ribosomal DNA internal transcribed spacer (ITS15.8S-ITS2) region and a ribosomal DNA group-I intron from the ...
Brian W. Teasdale, Anita S. Klein
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Interpreting biogeographical boundaries among Afrotropical birds: spatial patterns in richness gradients and species replacement

Journal of Biogeography, 1999
Summary Aim We analyse the geographical distribution of 1911 Afrotropical bird species using indices of three simple biogeographic patterns. The first index, the frequency of species with range edges (Te), is formulated to map directly the density of species distribution limits, for comparison with the results of traditional biogeographical ...
Paul H. Williams, Helen M. de Klerk, Timothy M. Crowe   +2 more
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Mammal species richness and biogeographic structure at the southern boundaries of the Nearctic region

Mammalia, 2014
AbstractWe analyzed whether the spatial variation in mammal species richness reflects the southern boundaries of the Nearctic region as previously established by endemism patterns. Records from 710 mammal species were drawn on a map of North America (from Canada and Alaska to Panama) gridded at 4° latitude-longitude. We evaluated the probable existence
Escalante, Tania, Rodríguez-Tapia, Gerardo, Linaje, Miguel, Morrone, Juan J., Noguera-Urbano, Elkin   +4 more
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Comparative biogeographic analysis of planktic foraminiferal survivorship across the Cretaceous/Tertiary (K/T) boundary

Paleobiology, 1994
It is now widely recognized that a large number of Cretaceous planktic foraminiferal species are commonly found associated with fully Danian faunas in many K/T boundary sections and deep-sea cores. This “Cretaceous” fauna has traditionally been regarded as representing the reworking of older Cretaceous sediments into younger strata, though recent ...
Norman MacLeod, Gerta Keller
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