Identifying habitat preferences and core areas of Amazon River dolphin activity using spatial ecology analysis

Mosquera-Guerra, Federico; Trujillo, Fernando; Pérez‐Torres, Jairo; Mantilla-Meluk, Hugo; Franco, Nicole; Valderrama, María Jimena; Acosta-Lugo, Estefany; Torres-Forero, Paula; Oviedo, José Saulo Usma; Barreto, Sebastian; Armenteras-Pascual, Dolors

doi:10.1007/s10980-022-01470-4

Cited by 8 publications

(3 citation statements)

References 91 publications

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“…Habitat preferences within the core habitat typically depend on environmental parameters, including habitat type (e.g. Allen et al, 2001; Mosquera‐Guerra et al, 2022), prey availability (e.g. Eierman & Connor, 2014; Heithaus & Dill, 2002) and various human activities (Carome et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

The distribution and habitat characterization of the East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) in coastal waters off Qingdao, China: Implications for management and conservation

Li,

Cheng,

Zuo

et al. 2024

Aquatic Conservation

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The East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) distributes in coastal waters across the western Pacific Ocean, ranging from the Taiwan Strait to northern China, Korea and Japan. Limited baseline data are available for this threatened species, including the coastal region of Qingdao, China, hindering the implementation of conservation management. The Oceanographic characteristics were derived from on‐board measurements and satellite remote sensing, including depth, slope, sea surface temperature (SST), salinity and chlorophyll a (Chla) concentration. Kernel density estimation (KDE) was utilized to determine the extent of occurrence and core distribution of East Asian finless porpoises. The surveys covered an area of 4532 km2, encompassing 7314 km of transect lines. The 95% KDE and 50% KDE for East Asian finless porpoises within the study site included 1987 and 297 km2, respectively. The 50% KDE revealed Laoshan Bay as the core distribution zone. Significant relationships were identified between distribution probability and three oceanographic variables: salinity, Chla concentration and distance to shore. In this study, the Aoshan Bay Marine Park, which was designed with no prior knowledge of East Asian finless porpoise, shows partial overlap with the core distribution for this species. This demonstrates that MPAs (marine protected areas) that are not explicitly designated for marine mammals may not comprehensively address all their specific requirements, but the existence and conservation endeavours associated with the MPAs can still yield substantial positive outcomes for these species. 5. This study provides the inaugural comprehensive baseline data on the population distribution and habitat characteristics of the East Asian finless porpoise. It underscores the necessity for a robust data collection protocol spanning China, Japan and Korea to address the critical shortfall in baseline data and enhance conservation efforts.

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Section: Discussionmentioning

confidence: 99%

The distribution and habitat characterization of the East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) in coastal waters off Qingdao, China: Implications for management and conservation

Li,

Cheng,

Zuo

et al. 2024

Aquatic Conservation

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“…The Ucayali and the Marañón River basins run mainly in Peruvian territory and have records of botos in the main river channels and in several tributaries such as Napo, Tigre, Pastaza, Morona, Santiago, and Huallaga in the Marañón to the mouth of Cenepa, Pucallpa, and Pacaya-Samiria (McGuire & Henningsen, 2007;Gomez-Salazar et al, 2012a;Campbell et al, 2017;Mosquera-Guerra et al, 2022). In Ecuadorian Amazon below 260 m of altitude, botos are well distributed along several rivers (Utreras et al, 2013), but there are no records on the Morona River (Utreras et al, 2010).…”

Section: Distributionmentioning

confidence: 99%

The Amazon River dolphin, Inia geoffrensis: What have we learned in the last two decades of research?

Silva

Brum²,

Mello

et al. 2023

Lat. Am. J. Aquat. Mamm.

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In the last decades, knowledge about the biology of the Amazon river dolphin Inia geoffrensis has increased considerably. Accordingly, we present a review of the published literature on this river dolphin, with a focus on topics with the most advancements and those that are important to the species conservation. We also present new information, including emerging knowledge on the other species of Inia. We summarize the current knowledge of the biology of Inia, covering aspects of taxonomy, distribution, life history and reproduction, genetics, anatomy and physiology, health, behavior, ecology, demographic parameters, and population trends. We also highlight the main anthropogenic threats affecting the species and the resulting conservation efforts.

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“…Satellite tracking can provide detailed information on individual animal movements and habitat use, as well as combining temporal and spatial information at the broader regional and global scales (Gredzens et al, 2014; Sveegaard et al, 2015). Satellite transmitters have been used successfully to track river dolphins but examples of this approach are limited (Mosquera-Guerra et al, 2021, 2022). In addition to providing information on dispersal and migration movements of these species, tracking can provide information on their behaviour, their relationship with environmental conditions and how these govern their distribution, and the importance of these environments to their life history (Davis et al, 2014; Gredzens et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Satellite-monitored movements of the Amazon River dolphin and considerations for their conservation

Campbell

Alfaro‐Shigueto

Mangel

et al. 2023

Oryx

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The Amazon River dolphin Inia geoffrensis occurs throughout the basins of the Amazon and Orinoco Rivers and is categorized as Endangered on the IUCN Red List. Using satellite tracking data from eight dolphins (one female and seven males) in the Peruvian Amazon, we demonstrate that these dolphins inhabit a variety of habitat types and have core areas and home range areas of variable magnitudes. To gain a better understanding of how threats affect these dolphins, we examined the distance of dolphin records to locations of current and potential future anthropogenic threats. On average, dolphin home ranges overlapped with fisheries by 89%. Dolphins were found at an average distance of 252 km from the nearest proposed dam and 125 km from the nearest proposed dredging site. Given that many of these threats are still in the planning stage, we advise the government to consider the negative effects these activities have already had on other riverine species before proceeding. Additionally, efforts should be made to expand river dolphin tracking programmes to span multiple seasons, to track more females at our study sites and to increase the numbers tracked overall in other areas to improve our knowledge of the species' movement patterns.

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Identifying habitat preferences and core areas of Amazon River dolphin activity using spatial ecology analysis

Cited by 8 publications

References 91 publications

The distribution and habitat characterization of the East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) in coastal waters off Qingdao, China: Implications for management and conservation

The distribution and habitat characterization of the East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) in coastal waters off Qingdao, China: Implications for management and conservation

The Amazon River dolphin, Inia geoffrensis: What have we learned in the last two decades of research?

Satellite-monitored movements of the Amazon River dolphin and considerations for their conservation

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