Cetaceans and environmental changes : Development and test of conservation status indicators to establish monitoring strategies
type: Dataset
description: Under national and international regulations, the establishment of cetacean population monitoring strategies became a priority. Monitoring main expected characteristics are the ecological significance, the statistical credibility and the cost-effectiveness. The use of indicators reduces monitoring cost, and constitutes communication tool between scientists and policy-makers. Indicators are measurable and verifiable data, which inform on more than themselves. The collect of stranding data is cost-efficient, but the lack of sampling strategy remains a hindrance to their use in context of monitoring strategy. The aim of this study is to develop cetacean population indicators based on stranding data.Four indicators were developed during this work. The proportion of stranded cetaceans compared to dead cetaceans at sea was estimated. Stranding long term time series were freed from drift conditions by the construction of the null hypothesis (that is a hypothesis of spatial and temporal uniformity of dead cetaceans). It constituted the stranding anomaly. The cetacean mortality cartography estimated the number of dead cetaceans at sea, independently of the stranding probability. Finally, cetacean mortality anomaly was calculated as the difference between mortality areas of stranded cetaceans and theoretical distribution of dead cetaceans predicted to strand under the null hypothesis. This anomaly identified high mortality or high relative abundance areas. These indicators could be integrated to many national and international management strategies.
identifier: NNT: 2011LAROS352
issued: 2026-05-11T16:05:14.747938
language: fr
modified: 2026-05-11T16:05:14.747944
contact point: Organization
  fn: CCSD
keyword: cetaceans
keyword: cetaces
keyword: hypothese-nulle
keyword: indicateurs
keyword: indicators
keyword: infoeu-reposemanticsdoctoralthesis
keyword: management
keyword: mesures-de-gestion
keyword: monitoring
keyword: null-hypothesis
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: strategie-de-suivi
keyword: theses
landing page: https://theses.hal.science/tel-00808638

Cetaceans and environmental changes : Development and test of conservation status indicators to establish monitoring strategies
type: Distribution
format: HTML
issued: 2026-05-11T16:05:14.772627
modified: 2026-05-11T16:05:14.722475
access URL: https://theses.hal.science/tel-00808638

test_moissonnage_selune
type: Agent