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Regional Forest Fragmentation and the Nesting Success of Migratory Birds
Observed reproductive rates were low enough for some species in the most fragmented landscapes to suggest that their populations are sinks that depend for perpetuation on immigration from reproductive source populations in landscapes with more extensive forest cover. Expand
  • D. Whitehead
  • Biology, Medicine
  • Evolution; international journal of organic…
  • 1 March 1969
The purpose of the present paper is to reflect on the factors governing the present geographical distribution of anemophily, and to speculate on its probable evolution within the angiosperms. Expand
Late Quaternary Environmental History of Lake Valencia, Venezuela
Chemical, paleontological, and mineralogical analyses of a 7.5-meter core from the middle of Lake Valencia, Venezuela, have provided information on the paleoclimatic history of this low-elevation,Expand
Late-Pleistocene Vegetational Changes in Northeastern North Carolina
Regional and local environmental changes spanning the last 30 000 yr have been reconstructed based on paleoecological studies of the sediments in Rockyhock Bay, a peat—filled Carolina Bay in ChowanExpand
Paleoecological investigation of recent lake acidification in the Adirondack Mountains, N.Y.
Paleoecological analysis of the sediment record of 12 Adirondack lakes reveals that the 8 clearwater lakes with current pH < 5.5 and alkalinity < 10 μeq l-1 have acidified recently. The onset of thisExpand
The developmental history of Adirondack (N.Y.) lakes
We utilized paleoecological techniques to reconstruct long-term changes in lake-water chemistry, lake trophic state, and watershed vegetation and soils for three lakes located on an elevationalExpand
Developmental and Environmental History of the Dismal Swamp
Pollen analysis of several cores from the Dismal Swamp in southeastern Virginia have indicated that the swamp is a relatively young feature, having begun to develop along drainage lows as recently asExpand
Holocene vegetation patterns in the Adirondack mountains
Pollen and plant macrofossil data from six sites along an elevational gradient in the east-central Adirondack Mountains reveal the history of six tree taxa in the region during the past 10 000 yr, revealing temporal changes in abundance of these taxa along the Elevational gradient. Expand