Landscape change throughout North America has resulted in heightened nest predator population and declining avian productivity. Essential to establishing effective management design is an understanding of differential predation pressure among avian groups as group specific responses to predation impact may exist.
The objective of this study was to examine the efficacy of predator trapping on the nest success and density of ground nesting avifauna in 2004-2005 in the Virginia Coast Reserve, specifically dabbling ducks, Canada Goose and Willet. Second, we determine the impact of predation on ground nesting birds by relating indices of predator abundance to nest density and nest success for island plots.
Overall Mayfield nest success for dabbling ducks was 54.4% (n = 12) in 2004 and 17.7% (n = 30) in 2005. Green Transformed nest success for dabbling ducks was 34.5% (n = 25) in 2004 and 23.0% (n = 42). For Canada goose, overall Mayfield nest success was 53.1 (n = 37) in 2004 and 47.7% (n = 39) in 2005. Overall Green Transformed nest success for Canada Goose was 59.5% (n = 57) in 2004 and 50.6% (n = 51) in 2005. Finally, overall Green Transformed nest success for Willet was 53.7% (n = 110) in 2004 and 46.0% (n = 118) in 2005.
Nest success estimates on island plots varied greatly. There was no difference in nest success between trapped and non-trapped islands for dabbling ducks (P = 0.1990), Canada Goose (P = 0.4860), Willet (P = 0.4920) and artificial nest success (P = 0.4200). Likewise, there was no difference in nest density between trapped and non-trapped islands for dabbling ducks (P = 0.2408), Canada Goose (P = 0.2950), and Willet (P = 0.1381). Several factors may explain this result including a lack of trapping efficacy, design flaws, low intensity of trapping, and differences in island habitat affecting avian nest site selection and sample size.
Nest success for both dabbling ducks (P = 0.0225) and Willets (P < 0.0001) was inversely related to predator activity, as measured by artificial nest success. In contrast, Canada Goose (P = 0.6686) showed no relationship between nest success and predator activity. For Canada Goose (P = 0.0064) and Willet (P = 0.0029), nest density decreased with increasing predator activity on island plots. Biased nest detection, philopatry to islands with reduced predation risk, and active selection for reduced predator environments may explain the higher nest density on islands with reduced predator activity.
On barrier islands in Virginia, dabbling duck nest densities are independent of predator activity (P = 0.1981). I hypothesize that, in this system, the availability of brood rearing habitat for ducks govern island selection above predation risk.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04102007-120515 |
| Date | 12 April 2007 |
| Creators | Arquilla, Brian Joseph |
| Contributors | Phil Stouffer, Frank Rohwer, Michael Chamberlain |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04102007-120515/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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