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3 results for “wood recruitment”
Wood duck nest survival and duckling recruitment is minimally affected by interspecific brood parasitism from hooded mergansers and black-bellied whistling-ducks
<p>In the southeastern United States, wood ducks (<em>Aix sponsa</em>) have historically experienced interspecific brood parasitism (IBP) primarily from hooded mergansers (<em>Lophodytes cucullatus</em>), but the recent northward expansion of black-bellied whistling-ducks (<em>Dendrocygna autumnalis</em>) has added a new complexity to these interactions. We monitored nest boxes in Louisiana to evaluate the influence IBP had on wood duck daily nest survival rate (after, DSR) and duckling recruitment. We monitored 1,295 wood duck nests from 2020−2023 and found 112 (8.7%) were parasitized by hooded mergansers and 148 (11.5%) by whistling-ducks. Parasitic egg-laying by hooded mergansers lowered wood duck DSR, while DSR for nests parasitized by whistling-ducks was comparable to clutches containing only wood duck eggs. We considered the wood duck capture histories of 2,465 marked female ducklings and 540 banded adult females to estimate a duckling recruitment probability for the entire study period. We recaptured 50 ducklings as adults; 6 (12.0%) hatched from clutches parasitized by hooded mergansers, 1 (2.0%) from a clutch parasitized by a whistling-duck, and 43 (86.0%) from clutches containing only wood duck eggs. The duckling recruitment probability was 0.039 (95% credible interval = 0.028, 0.051). Nest initiation date had a negative effect on recruitment, wherein most recruits hatched from nests initiated earlier in the season. Given only ~9% of wood duck nests contained hooded merganser eggs, we conclude IBP writ large had no detrimental effect on DSR at a population level. The lower DSR of clutches parasitized by hooded mergansers is potentially linked to a high abundance of early-season parasites that produce "dump nests" and these clutches are often abandoned without being incubated. Despite ongoing parasitism by hooded mergansers and the range expansion of whistling-ducks, wood duck productivity in Louisiana appears to be minimally affected by interspecific brood parasitism.</p>
Wood duck nest survival and duckling recruitment is minimally affected by interspecific brood parasitism from hooded mergansers and black-bellied whistling-ducks
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Dynamics of wood recruitment in streams of the northeastern US
A space-for-time analysis was used to quantify large wood loading to 28 streams in the northeastern US with a range of in-stream and riparian forest characteristics in order to better inform stream restoration and stream management efforts. We documented the current volume and frequency of occurrence of large wood in streams with riparian forests varying in their stage of stand development as well as stream size and gradient. This data set includes wood, stream and riparian forest metrics collected between 2003 and 2007. Linear models relating stream wood characteristics to stream geomorphic and forest characteristics were compared and results can be found in: Warren, D. R., C. E. Kraft, W. S. Keeton, J. S. Nunery and G. E. Likens. 2009. Dynamics of wood recruitment in streams of the northeastern US. Forest Ecology and Management 258(5):804-81 https://doi.org/10.1016/j.foreco.2009.05.020 These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
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