Power13_SpatialPatternsIslandsReserves

Power13_SpatialPatternsIslandsReserves - Spotted(habitat...

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1 Spotted (habitat and feeding specialist, old growth obligate) vs Barred Owl (generalist, feeds in agricultural areas, nests in forests, outcompetes Spotted Owl when old growth is fragmented and surrounded by fields). SF Chronicle letter Nov. 2005: “another owl, not land use, threatens spotted owl.” Refute this argument. 2 Spotted (habitat and feeding specialist, old growth obligate) vs Barred Owl (generalist, feeds in agricultural areas, nests in forests, outcompetes Spotted Owl when old growth is fragmented and surrounded by fields). SF Chronicle letter Nov. 2005: “another owl, not landuse, threatens spotted owl.” Refute this argument. 3 Rio Negro (Alex Flecker) Michael Goulding, The Fishes and the Forest 4 Unfragmented Fragmented 1 ha 1 ha 10 ha 10 ha 100 ha fragment 100 ha fragment 1 ha 1 ha 10 ha 1 ha study plot, forest edge Forest fragmentation experiment in Brazil 1 hectare (ha) study plots, forest interior 5 6 Freshly cut edges Years later
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7 Amazon rainforest conversion… Minimum critical size of ecosystem project Amazon, northern Brazil (Lovejoy) Square reserves of jungle in sea of cleared land Small 1 ha (100 x 100 m) patches: blowdown, edges topple, interior understory vegetation shriveled Cow invasion Recovery dynamics—change in edges.. 8 Unfragmented Fragmented 1 ha 1 ha 10 ha 10 ha 100 ha fragment 100 ha fragment 1 ha 1 ha 10 ha 1 ha study plot, forest edge Forest fragmentation experiment in Brazil 1 hectare
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