Bird Population Responses to Forest Management Strategies

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Slide 22

We also wanted to look at community composition by the different treatment types, and so we ran an analysis to see if the bird communities seemed to be different between the thinned and unthinned areas. On this graph each triangle represents one of our surveys, so half of them are from our thinned areas and half are from dense areas. The placement of the triangles is based on the We would expect surveys with more similar species composition to be closer together. The fact that the surveys go upwards on the graph does not mean anything about the values we found, and just makes the data easier to visualize. Looking at all of our surveys, we did not find any significant trends, meaning that whether or not the forest had been thinned did not have an affect on the bird communities.

Slide 23

Thinning significantly affected bird abundance and richness in the Sagehen Reserve forest, suggesting that the forest management strategies implemented here have been successful in maintaining and even improving bird habitat. It is also impressive to see that this has happened in such a short period of time. However, it is important to keep in mind that this is an overall trend, and that there may be some species that still do better in dense areas, and thus it is important to keep some dense areas, especially if thinning some areas may jeopardize birds such as the goshawk during its season.

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Bird Population Responses to Forest Management Strategies Carina, Alex, Mary, and Joey

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Fire History in California

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Forest Management

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Forest Management

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How do different forest management strategies impact bird abundance and richness? Questions and Hypotheses

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How do different forest management strategies impact bird abundance and richness? Do different forest management strategies change bird species assemblages? Questions and Hypotheses

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How do different forest management strategies impact bird abundance and richness? Thinned forest will have a greater species abundance and richness Do different forest management strategies change bird species assemblages? Questions and Hypotheses

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How do different forest management strategies impact bird abundance and richness? Thinned forest will have a greater species abundance and richness Do different forest management strategies change bird species assemblages? Thinned and dense forests will have different species composition Questions and Hypotheses

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Sampling of Different Forest Management Areas Key

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Sampling of Different Forest Management Areas Key Dense Forest

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Sampling of Different Forest Management Areas Key Dense Forest Thinned Forest Site 1

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Sampling of Different Forest Management Areas Key Dense Forest Thinned Forest Site 1 Site 2

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Sampling of Different Forest Management Areas Key Dense Forest Thinned Forest Day 1 Site 1 Site 2

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Sampling of Different Forest Management Areas Key Dense Forest Thinned Forest Day 1 Day 2 Site 1 Site 2

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Sampling of Different Forest Management Areas Key Dense Forest Thinned Forest Day 1 Day 2 Day 3 Site 1 Site 2

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Sampling of Different Forest Management Areas Day 1 1 2 3

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Sampling of Different Forest Management Areas Day 1 Day 2 1 2 2 1 3 3

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Sampling of Different Forest Management Areas Day 1 Day 2 Day 3 1 2 2 1 2 1 3 3 3

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Point Surveys -Fixed position -30 second acclimation period -5 minutes of tallying all detected birds heard and seen

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Results: Bird Abundance by Treatment P=0.02

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Results: Bird Richness by Treatment P=0.03

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Results

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Discussion Our data suggests that the experimental tree thinning implemented at Sagehen Creek could be overall beneficial to bird populations There was a significant increase in bird abundance and richness in areas with tree thinning This is even greater interest due to the short time frame of change! Our community data showed that there was no effect of tree thinning on bird community make up

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Future Directions Some future studies we could do on our topic: Bird behavioral use of wood piles in thinned areas Performing study at: Different times of year Different elevations Different aspects Adding more habitat types to compare with tree thinned

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Thank you! Questions?

Summary: Spring, 2018

Tags: student projects

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