Variety of s-s habitats in NE, make up significant percent of land area
Large, diverse bird community. Historically, habitat maintained by natural disturbances
… like this guy here. Unfortunately, mastodons aren’t around any more, so we have to do the work ourselves to maintain shrublands
Today, most s-s habitats maintained by deliberate management/anthropogenic disturbances. Ideally we’d have enough habitat that we wouldn’t have to worry about the details of management…
Unfortunately, not enough.
And now bird pops. tanking. THis is our motivation for our work on s-s birds. Given declining bird pops. and habitat limitation, imp. to determine the best ways to manage for them.
One way to think about ecol. strategies of s-s birds is to compare shrublands and eastern forests, where birds are well-studied. Forest are relatively permanent…
Based on ecology of shrublands in NE, here’s what we might expect. If go to literature, can find people saying these things about s-s birds. (After introducing each one): Really, this is what we hope for—would make management easy!
Going to go through these 4 areas 1-by-1 and see if the data support our predictions. Start w/hab. relationships. People call s-s birds generalists—why? Live in multiple habitats, clearcuts, swamps, especially suburbs. Hoping to avoid that sort of anecdotal reasoning…so we went out and surveyed birds in the field.
Contrast dandelions (r-selected, poor competitors, high dispersal rate) with
Site fidelity review methods
For forest birds, edges can be a major conservation issue—depressed abundances and increased predation rates along edges. Often think about edge effects in terms of forest fragmentation.
If you go out into these fragmented forests and look at s-s birds,…
Significant for 8 of 17 species.
Truism in conservation biology that larger patches are better, define minimum patch sizes for forest birds
Historical changes in s-s habitat; success in restoring forest; less success in restoring shrublands/natural disturbance regimes
Idea that s-s birds are edge specialists became so well entrenched that the two became essentially synonymous
Ecological Strategies of Northeastern Scrub-shrub Birds Scott Schlossberg David King Dept. of Nat. Res. Conservation U.S. Forest Service University of Massachusetts Northern Research Station
Birds in clearcuts and groupcuts Schlossberg and King 2007 Costello et al. 2000 Annand and Thompson 1997 Kerpez 1994 Rodewald and Vitz 2005 Alder flycatcher Blue-winged warbler Black-and-white warbler Cedar waxwing Common yellowthroat Chestnut-sided warbler Field sparrow Indigo bunting Mourning warbler Prairie warbler
Birds in clearcuts and groupcuts Costello et al. 2000 Annand and Thompson 1997 Kerpez 1994 Rodewald and Vitz 2005 Alder flycatcher CC Blue-winged warbler CC CC Black-and-white warbler CC CC CC Cedar waxwing CC Common yellowthroat CC CC Chestnut-sided warbler CC Field sparrow CC CC CC Indigo bunting CC CC CC CC Mourning warbler CC Prairie warbler CC CC CC