Rookery Island Bird Abundance: A 40 Year Study

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Presentation transcript:

Rookery Island Bird Abundance: A 40 Year Study Miranda Madrid

What are rookery islands? Where colonial waterbirds gather in rookeries or colonies during nesting season Islands along the Texas coast Increased likelihood of chick survival Threats include: habitat loss and degradation, predation, human disturbance, marine debris

Why does this matter? Stakeholders Conservationists: high quality habitat through effective management Birders and Hunters: high aesthetic and recreational value Larger Ecosystem: bioindicators Objective: How have nesting dynamics changed on rookery islands over the years

The Data Texas Coastal Waterbird Survey: longest standing and most comprehensive for state Observations 1973-2013 of 35 species Includes 5 T&E species (TPWD and/or USFWS) Restoration Islands for Coastal Bend Bays and Estuaries Program Mission Aransas NERR Boundary

Focused Study Area Mission Aransas National Estuarine Research Reserve (NERR) 6 Rookery Islands in Redfish and Mesquite Bays TCW Surveys conducted CBBEP Restoration

1975 Ground Nesting Pair Abundance Shrub Nesting Pair Abundance

2012 Ground Nesting Pair Abundance Shrub Nesting Pair Abundance

Reddish Egret (Ground nester): TPWD Threatened species

Considerations Preferred nesting habitat focus Food availability? Pollution? Breeding success? Factors outside of the study region Survey limitations Local versus Regional

Continued work Better visual of temporal analysis Abundance by island area How to include land cover/vegetation change over time…

Questions?