Reserve planning based on the investigation of the core habitat distribution of wild cetaceans is a powerful conservation strategy for protecting target species. However, studies on core habitats and their variations at the large-scale distribution of cetaceans are limited. In this study, we conducted a seven years (2015-2021) boat-based field observation surveys with highly applicable and generalized methods to analyze the habitat changes and how these changes influenced the largest known Indo-Pacific humpback dolphin (Sousa chinensis) population in the Pearl River Estuary (PRE), China. Our findings revealed that there is 3204 km2 of dolphin habitat in the PRE, and dolphin distribution preferences are related to nutrients and biological resources. The decreasing trend of dolphin sighting rates in most areas (73.2%) indicated that the dolphin habitat had declined, and the annual habitat decline rate (2.83%; 95% confidence interval: 0.58%-5.08%) was consistent with the population decline rate. The annual habitat decline rate in the hypoxic zone revealed that low dolphin sighting rates from March to October in the hypoxic zone was 0.43% faster than that in the non-hypoxic zone, indicating long-term sustained effects of summer hypoxia on the dolphin population. Existing reserves have partially prevented habitat decline. However, more than 82.3% of the habitat has not been effectively protected and encounters the threats of pollution and hypoxic stress. This study offers new scientific evidence for developing effective monitoring strategies for humpback dolphin populations in the PRE, and also help establish spatial planning and management measures for reserve habitats.
Marco Caracciolo is Associate Professor of English and Literary Theory at Ghent University in Belgium, where he led the ERC Starting Grant project “Narrating the Mesh.” (2017–2022). His work explores the phenomenology of narrative, or the structure of the experiences afforded by literary fiction and other narrative media. He is the author of several books including the most recently Slow Narrative and Nonhuman Materialities (2022) and Contemporary Fiction and Climate Uncertainty: Narrating Unstable Futures (2022). In September 2021, Dr. Wang Hongri interviewed Caracciolo on Anthropocene literature and econarratology via e-mail. In this interview, Caracciolo sheds light on the use of such concepts as the Anthropocene, climate crisis and climate change fiction in literary studies. Further, he elaborates on the tardiness of narratological interests in environmental issues and narrative’s formal affordance to address the Anthropocene condition. After commenting on the relationship between New Formalism and the contextualist vein of contemporary narrative theory, Caracciolo identifies four future directions for the study of Anthropocene literature and econarratology.
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