Nest Survival of American Coots Relative to Grazing, Burning, and Water Depths
Bibliographic record
Abstract
Water and emergent vegetation are key features influencing nest site selection and success for many marsh-nesting waterbirds. Wetland management practices such as grazing, burning, and waterlevel manipulations directly affect these features and can influence nest survival. We used model selection and before-after-control-impact approaches to evaluate the effects of water depth and four common landmanagement practices or treatments, i.e., summer grazing, fall grazing, fall burning, and idle (no active treatment) on nest survival of American coots (Fulica americana) nesting at Grays Lake, a large montane wetland in southeast Idaho. The best model included the variables year treatment, and quadratic functions of date, water depth, and nest age; height of vegetation at the nest did not improve the best model. However, results from the before-after-control-impact analysis indicate that management practices affected nest success via vegetation and involved interactions of hydrology, residual vegetation, and habitat composition. Nest success in idled fields changed little between pre-and post-treatment periods, whereas nest success declined in fields that were grazed or burned, with the most dramatic declines the year following treatments. The importance of water depth may be amplified in this wetland system because of rapid water-level withdrawal during the nesting season. Water and land-use values for area ranchers, management for nesting waterbirds, and long-term wetland function are important considerations in management of water levels and vegetation. RSUM. L'eau et la vgtation mergente reprsentent des caractristiques cls pour la slection du site de nidification et le succs de reproduction chez de nombreux oiseaux de marais. Les pratiques d'amnagement des milieux humides, comme le pturage, le brlage et la gestion du niveau d'eau, affectent directement ces caractristiques et peuvent donc avoir un effet sur la survie au nid. Nous avons utilis la slection de modles et l'approche BACI (before-after control-impact) afin d'valuer les effets du niveau d'eau et de quatre pratiques ou traitements courants d'amnagement, soit le pturage estival ou automnal du btail, le brlage automnal et l'absence de traitement, sur la survie au nid de la Foulque d'Amrique (Fulica americana) nichant au lac Grays, un vaste milieu humide subalpin dans le sud-est de l'Idaho. Le meilleur modle comportait les variables anne traitement et des fonctions quadratiques de la date, de la profondeur d'eau et de l'ge du nid; l'inclusion de la hauteur de la vgtation autour du nid n'a pas permis d'amliorer le meilleur modle. Toutefois, les rsultats de l'analyse BACI ont indiqu que les pratiques d'amnagement affectaient la survie au nid en modifiant la vgtation par le biais d'interactions entre l'hydrologie, la vgtation rsiduelle et la composition de l'habitat. La survie au nid dans les champs n'ayant pas t cultivs a peu chang entre les priodes pr-et post-traitements, tandis qu'elle a diminu dans les champs qui ont t brouts ou brls -les baisses les plus marques advenant l'anne suivant les traitements. L'importance de la profondeur d'eau dans ce milieu humide est peut-tre amplifie par le fait que le niveau d'eau diminue rapidement durant la saison de nidification. L'importance de l'eau et de l'utilisation du sol 1 U.S. Geological Survey, Northern Prairie Wildlife Research Center Avian Conservation and Ecology 6(2): 1 http://www.ace-eco.org/vol6/iss2/art1/ pour les propritaires de ranch de la rgion, l'amnagement de l'habitat pour les oiseaux aquatiques nicheurs et le fonctionnement long terme des milieux humides reprsentent des lments essentiels considrer dans la gestion des niveaux d'eau et de la vgtation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".