Evaluating methods to reduce humpback whale (Megaptera novaeamgliae) ship strike mortality in nearshore feeding habitats within the San Francisco Bay
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Résumé
Across our world’s oceans, whales are perpetually stuck and killed by large ships. Sea-based commercial trade is increasing on a global scale; therefore, more large ships are circumnavigating through biologically important whale habitats. This is of grave concern to marine resource managers, especially in the United States where major shipping corridors overlap critical whale habitat. It is feared that in these areas with high whale density, ship strikes are reducing populations of whales to levels below what is sustainable for threatened and endangered species, thereby hindering the recovery of depleted whale populations. Humpback whales, a species that is federally-listed as endangered, congregate and feed within the National Marine Sanctuary system off the coast of San Francisco and these whales are increasingly prone to the threat of a lethal ship strike. Humpback dietary preferences shift between krill and schooling fish, and within the past five years, spawning northern anchovy have attracted increased numbers of humpback whales to nearshore waters heavily trafficked by large ships en route to ports within the San Francisco Bay. A voluntary speed reduction program implemented in the National Marine Sanctuaries has been partially effective at engaging commercial shipping operators towards compliance with the voluntary speed reductions. However, it is unclear if these strategies can be feasibly extended to waters within the San Francisco Bay, which is outside the jurisdictional boundaries of the sanctuaries. Additionally, compliance with the speed reduction measures needs to increase in order to adequately protect whales in this entire region. I evaluated voluntary ship strike reduction techniques that have been implemented in other international shipping ports with whales (Hauraki Bay, New Zealand and St. Lawrence Estuary, Quebec, Canada), and interviewed local subject matter experts to determine which aspects of voluntary speed reduction measures were the primary drivers of increased voluntary speed reduction compliance, and vi which of those can feasibly be implemented in the San Francisco Bay to protect humpbacks. Educational outreach and onboard engagement with shipping operators were common success factors across all case studies. Furthermore, strategies to promote corporate social responsibility also show promise for increasing compliance by vessels. These findings can be used to substantiate and inform future management plans for lowering ship strike risk in areas across the world in need of evidence-based support of voluntary speed-restriction measures.
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Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,003 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,002 | 0,002 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
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Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle