delineation of winter and pre breeding habitats of rocky mountain population trumpeter swans
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Delineation of Winter and Pre-breeding Habitats of Rocky Mountain Population Trumpeter Swans. Core tri-state wintering area of RMP trumpeter swans. History and Status of Trumpeter Swans. Restoration efforts underway since the 1930s

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Presentation Transcript
history and status of trumpeter swans

History and Status of Trumpeter Swans

Restoration efforts underway since the 1930s

Translocations have resulted in more trumpeter swans in North America

The Canada breeding segment of the RMP has increased

The number of breeding swans in the core tri-state area of Montana, Idaho, and Wyoming remains low

slide5
Rocky Mountain Population is between the black dashed lines

Notice the large Canada breeding area and the small tri-state core area

tri state swans increase to several thousand in winter

Tri-state swans increase to several thousand in winter

The Canada breeding portion of the Rocky Mountain Population has increased to >4000

Canadian birds migrate to winter in the tri-state

<1,000 wintered in the tri-state before 1980

>5,400 in February 2006 winter survey

Competition with swans from Canada in winter may reduce productivity of the tri-state breeders

slide9
On the National Elk Refuge, wintering swans removed 42% of foliage and 28% of tubers of Stuckenia pectinatus (Squires 1991)
slide11

The 2002 Trumpeter Swan Implementation Plan (TSIP) calls for reducing swans wintering the core tri-state area to 1,500

Redistribution efforts have included

Trapping and translocating hundreds of cygnets to areas outside the core area

Hazing of concentrations of swans from lakes and rivers

tsip also called for

TSIP also called for:

Our goal:

Inventory of suitable habitat throughout the range of RMP

The development of a comprehensive database and model of potential habitat availability

  • Use image analysis and GIS to delineate areas of both used and potential wintering habitat in the tri-state core and beyond
method supervised classification

Method – Supervised Classification

To use image analysis software to

determine the reflectance characteristics of wetlands known to be used by wintering swans

find other locations that have those same characteristics (potential habitat)

Used the Leica Image Analysis Extension for ArcGIS

landsat tm data

The positives:

  • Provides 8 spectral bands
    • visible, infrared, and thermal
  • Each scene is big
    • All of Yellowstone NP in 1

Landsat TM data

landsat tm data1

Landsat TM data

The positives:

Provides 8 spectral bands

visible, infrared, and thermal

Each scene is big

All of Yellowstone NP in 1

Computer can easily handle the 9-scene mosaic required

Our tri-state mosaic

It’s available and free

landsat tm data2

Landsat TM data

The positives:

Provides 8 spectral bands

visible, infrared, and thermal

Each scene is big

All of Yellowstone NP in 1

Computer can easily handle the 9-scene mosaic required

Our tri-state mosaic

It’s available and free

The negatives:

15-m to 60-m pixel size

Might miss smaller wetlands

swan winter location data

Swan winter location data

  • Nov-Feb (winter) resightings within tri-state region represent >16,000 records of swans in >100 separate locations

Neckband resighting records collected over the last 17 years (since 1990)

1990-2002 have been tabulated with lat –long locations

yellow dots each represent from 1 to several hundred neck band sightings during winter nov feb
Yellow dots each represent from 1 to several hundred neck band sightings during winter (Nov-Feb)
yellow dots each represent from 1 to several hundred neck band sightings during winter nov feb1
Yellow dots each represent from 1 to several hundred neck band sightings during winter (Nov-Feb)
second set of location data

Second set of location data

Winter aerial surveys flown annually for the last 5 years (2002-2006)

Separate counts for >200 named areas in the Montana, Idaho, and Wyoming

Lat-long locations were not usually precise enough for our purposes here

Only Wyoming data for 2006 were considered precise enough

slide28

Selection of pixel for classification as swan habitat:

One pixel per survey point

Only wetland (dark) pixels used

Within 2 pixels of survey point

slide29

Selection of pixel for classification as swan habitat:

One pixel per survey point

Only wetland (dark) pixels used

Within 2 pixels of survey point

slide30

Supervised classification:

Software found all pixels on the image within the spectral range of those selected

Analysis used all 8 Landsat TM spectral bands

slide31

Supervised classification:

Software found all pixels on the image within the spectral range of those selected

Analysis used all 8 Landsat TM spectral bands

interim conclusions work is on going

Interim Conclusions(work is on-going)

The technique seems promising

More, geographically precise swan location data are needed over the entire area

We hope to use higher resolution imagery only within areas identified as wetlands by NWI maps

Would like to incorporate a classification of wetland sites known to NOT be suitable to swans to improve the classification

Ultimately need to validate the final product against independent swan locations

if successful

If successful

The map of potential wintering sites would be useful in carrying out the Flyway’s Trumpeter Swan Implementation Plan

Identify possible translocation sites

Model probabilities swans will find these sites

On their own, based on known swan food-searching and dispersal characteristics

Upon hazing from traditional wintering areas

acknowledgements

Acknowledgements

Eastern Kentucky University

USGS

Northern Rocky Mountain Science Center

Montana State University

US Fish and Wildlife

Migratory Birds

Pacific Flyway

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