Status and Management of Roseate Terns (Sterna dougallii) in Nova Scotia
Bibliographic record
Abstract
The most important breeding colonies for endangered roseate terns in Canada occur on coastal islands in Nova Scotia. The main threat to productivity at these sites appears to be predation, particularly from gulls. The goal of this paper is twofold: 1) to present the results of recent roseate tern surveys in Nova Scotia and 2) to report on the results of a non-lethal gull control program at one of the main breeding sites in the province. The results of the surveys suggest that the number of breeding pairs (approximately 130) in the province has remained relatively stable, and is similar to numbers reported 20 years ago. Breeding sites have, however, fluctuated in number from a high of 10 sites in 1999 to a low of 3 in 2003. Although the concentration of birds to few locations makes some management options easier, it also increases their vulnerability to chance events. The non-lethal gull control program initiated on Country Island in 1998 has proven relatively successful, resulting in an increase in the numbers of breeding common, arctic and roseate terns on the island and a decrease in predation of tern eggs and chicks. Although this program has been effective in reducing predation, it must be maintained in the long-term if these birds are to breed successfully.Au Canada, les plus grosses colonies de Sternes de Dougall, espèce en voie de disparition au pays, se trouvent sur des îles côtières de la Nouvelle-Écosse. La principale menace à la productivité de ces colonies semble être la prédation, en particulier par les goélands et les mouettes. Le présent document vise deux objectifs : 1) présenter les résultats des récents relevés de Sternes de Dougall en Nouvelle-Écosse et 2) faire état des résultats d’un programme de lutte non mortel contre les goélands et les mouettes mis en oeuvre dans un des principaux lieux de nidification de la province. Selon les relevés, le nombre de couples nicheurs (environ 130) est demeuré relativement stable dans la province et est comparable à celui signalé il y a 20 ans. Cependant, le nombre de lieux de nidification a varié, passant de 10 lieux en 1999 à 3 en 2003. La concentration des oiseaux en seulement quelques endroits peut faciliter l’application de certaines méthodes de gestion, mais elle rend plus vulnérables aux phénomènes stochastiques. Le programme de lutte non mortel contre les goélands et les mouettes mis en oeuvre en 1998 dans l’île Country a assez bien réussi et y a entraîné l’augmentation du nombre de Sternes pierregarins, de Sternes arctiques et de Sternes de Dougall nicheuses et une réduction de la prédation des oeufs et des poussins de sternes. Bien que le programme ait contribué à diminuer la prédation, il faut le maintenir à long terme pour que les oiseaux puissent se reproduire.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.005 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".