نتایج جستجو برای: palaeoecology
تعداد نتایج: 398 فیلتر نتایج به سال:
The palaeoecology of basal turtles from the Late Triassic was classically viewed as being semi-aquatic, similar to the lifestyle of modern snapping turtles. Lately, this view was questioned based on limb bone proportions, and a terrestrial palaeoecology was suggested for the turtle stem. Here, we present independent shell bone microstructural evidence for a terrestrial habitat of the oldest and...
A small assemblage of animal bones and marine shells was recovered from Mill Mount, Tadcaster Road, York, during excavations in 2004. An assessment of these remains was undertaken. The preservation of the animal remains was consistently fair throughout the assemblage. Two phases contained reasonable quantities of bone. Phase 1 (Roman) material consisted of a mixture of remains from the major do...
Transcontinental dispersals by organisms usually represent improbable events that constitute a major challenge for biogeographers. By integrating molecular phylogeny, historical biogeography and palaeoecology, we test a bold hypothesis proposed by Vladimir Nabokov regarding the origin of Neotropical Polyommatus blue butterflies, and show that Beringia has served as a biological corridor for the...
Starting from a subjective viewpoint on the decreasing interest in invertebrate fossil taxonomy, this essay discusses its importance palaeobiological studies exemplified with cases palaeobiogeography and palaeoecology of rugose corals, aims at provoking discussion topic. The possible causes this negative declining trend include inherent problems palaeontological changing systems in science high...
Pollen analysis on a sediment core from a mangrove area in southeastern Mexico was discussed and aspects of paleoecology, ecology and conservation were considered. The core spans the last 4000 years and evidences changes in a Rhizophora mangle dominated system. Between 3900 and 3500 cal yr BP, pollen data indicate higher levels of precipitation. Between 3600 and 3300 cal yr BP tropical forest n...
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