Individual identification and photographic techniques in mammalian ecological and behavioural research—Part 2: Field studies and applications

Mammalian Biology, Год журнала: 2022, Номер 102(4), С. 1047 - 1054

Опубликована: Авг. 1, 2022

Язык: Английский

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Long-term observations reveal short-term mother–calf affiliation in wild harbour porpoises

Animal Behaviour, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Язык: Английский

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Harbor porpoise Phocoena phocoena ( )

Elsevier eBooks, Год журнала: 2025, Номер unknown, С. 421 - 486

Опубликована: Янв. 1, 2025

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Resident Harbor Porpoises (Phocoena phocoena vomerina) in the Salish Sea: Photo-Identification Shows Long-Term Site Fidelity, Natal Philopatry, and Provides Insights into Longevity and Behavior

Oceans, Год журнала: 2025, Номер 6(1), С. 9 - 9

Опубликована: Фев. 7, 2025

Harbor porpoises have been well studied in locations worldwide, but relatively little research has focused on site fidelity of individuals, which influences population structure and determines appropriate management conservation measures. This study investigated the behavior harbor through long-term, land-based photo-identification around Fidalgo Island, Washington, USA. Individuals were consistently re-sighted for up to 11 years, including natal philopatry. There was individual variation seasonal fidelity, with some individuals seen year-round, though general porpoise presence area re-sightings greatly reduced during summer. Females had calves yearly 3 consecutive females as old at least 14 successfully producing calves. evidence mother–calf associations post-weaning, none long-term. Behavior affected by tide, where traveled more foraged socialized less ebb tide compared other tidal states. Mating attempts aerial behaviors observed 84 times year-round every month season. provides documentation a local, resident porpoise, emphasizes need fine-scale studies like this ensure populations and/or stocks worldwide.

Язык: Английский

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Advancing Wildlife Monitoring in Gregarious Species with Drone Swarms

Lecture notes in networks and systems, Год журнала: 2025, Номер unknown, С. 310 - 316

Опубликована: Янв. 1, 2025

Язык: Английский

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Assessing Cetacean Habitat Suitability in the Northeast Pacific From Citizen Science Data

Journal of Biogeography, Год журнала: 2025, Номер unknown

Опубликована: Июнь 2, 2025

ABSTRACT Aim Citizen science is an important source of biodiversity information, particularly for gathering information on species distributions across large geographic areas. However, there are challenges with spatial and biases, variation in effort citizen data. We aimed to investigate summer winter habitat suitability cetacean reported the northeastern Pacific by applying distribution models (SDMs) opportunistic sightings data submitted Ocean Wise Sightings Network (OWSN). Location British Columbia, Washington State, South Alaska. Taxon Order Cetacea. Methods employed maximum entropy SDMs 10 most frequently OWSN between 2002 2022. thinned dataset account bias sighting locations used occurrences non‐target as background points ensure same presence pseudoabsence Best‐performing were selected based continuous Boyce Index evaluated against null models, predictions four compared density surface model (DSM) (Wright et al. 2021) using Jaccard–Tanimoto Index. Ensemble each then made best‐performing seasonal means environmental variables study period produce coast‐wide maps relative species. Results Across all species, closely reflected known Pacific. Summer hotspots included: continental shelf offshore Vancouver Island Haida Gwaii following deep canyons Queen Charlotte Sound; encompassed nearshore waters within Columbia Washington, well much Hecate Strait north southern parts Sound. SDM suitable Dall's porpoise, harbour fin whale, humpback whale 2018 significantly similar DSM index. Main Conclusions efficient mechanism generating occurrence. Through accounting biases sampling, can be applied long‐term trends distribution, especially concerning impacts anthropogenic‐mediated pressures such climate change.

Язык: Английский

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Fish Feeding and Rapid Foraging Behavior Switching by Gray Whales (Eschrichtius robustus) in California

Aquatic Mammals, Год журнала: 2024, Номер 50(2), С. 132 - 151

Опубликована: Март 12, 2024

Gray whales (Eschrichtius robustus) evolved to suction feed on benthic invertebrates and typically do not consume adult fish. Yet, these are flexible foragers, occasionally skim feeding planktonic rarely lunge fish, the latter according anecdotal accounts. We documented unusual phenomenon of multiple gray predating dense schools anchovy over a sustained period (22 days) in June 2022 at Pacifica, California, Gulf Farallones. Analysis 11,265 photos 11 video clips (totaling 4 min 16 s) for behavior whale identification resulted total 165 foraging events by six identified whales. Attribution most active individuals was achieved matching left pectoral fins, visible during lateralized behavior. Whales rolled onto their right sides 96% near-surface side-swimming bouts. Another behavior, first photographed here, dynamic surface one whale. Five interspersed fish with evidenced sediment streaming: prey type switching executed rapidly, less than 1 minute several instances, shortest intervals reported baleen Similar results were obtained (continuous or intermittent lunging) pursuit Four photo-identified Pacifica sighted San Francisco Bay/Gulf Farallones, which also matched Pacific Coast Feeding Group. Such local regional connections warrant efforts determine whether use this area as migratory stopover site summer foraging, both. Our observations confirm behavioral plasticity opportunistic exploitation food resources mid-latitudes, may enhance resilience climate change.

Язык: Английский

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Harbour Porpoises Are Flexible Predators Displaying Context‐Dependent Foraging Behaviours

Ecology and Evolution, Год журнала: 2024, Номер 14(12)

Опубликована: Дек. 1, 2024

ABSTRACT Opportunistic mobile predators can adapt their behaviour to specific foraging scenarios, allowing them target diverse prey resources. An interesting example is the harbour porpoise ( Phocoena phocoena ), a marine mammal with huge energy demand feeding on large variety of fish, squid and shrimps. Little known about porpoises, as observations wild specimens are notoriously difficult obtain. In this study, was identified in almost 60% videos from UAV recordings Danish coastal waters during daylight hours. Observations reveal be flexible predators, both single fish schools well individually groups varying sizes. We argue that some observed behavioural adaptations context‐dependent strategies for capture based information transfer social learning. Our results provide unprecedented insights into an opportunistic mammalian predator. Furthermore, study highlights importance porpoises having access areas acquisition, where they conflict anthropogenic disturbances such fisheries risk bycatch.

Язык: Английский

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Application of multi-species photo-ID database management systems: a user’s perspective

Mammalian Biology, Год журнала: 2022, Номер 102(4), С. 1619 - 1629

Опубликована: Авг. 1, 2022

Язык: Английский

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Identifying social clusters of endangered main Hawaiian Islands false killer whales

Endangered Species Research, Год журнала: 2023, Номер 51, С. 249 - 268

Опубликована: Июнь 15, 2023

The presence of distinct social groups within an animal population can result in heterogeneity many aspects its life history and ecology. ability to accurately assess group membership increases with the number times individuals are identified, but obtaining sufficient sightings rarely encountered species be difficult. Three clusters were previously identified for endangered false killer whales Pseudorca crassidens around main Hawaiian Islands, using modularity among associations a 12 yr photographic dataset no restrictions on seen. In this study, we used photo-identification data over 23 period reassess clusters, restricted seen at least 5 different days. We compared robustness clustering assignments from 6 community detection algorithms found that 3 highest-ranking all same (4) clusters. Spatial use varied islands, 4 regularly only off 1 or 2 island study areas. Comparison genetic differentiation revealed significant nuclear DNA. Furthermore, possess mitochondrial DNA haplotype, while other approximately 40% animals second haplotype. This level associated may have implications mark-recapture abundance estimation, as well mitigating exposure anthropogenic activities, including interactions fisheries.HŌ‘ULU‘ULU MANA‘O: Pili nā ‘ano like ‘ole o ka nohona me ke kālaikaiaola pū‘uo holoholona i loa‘a ‘ana pū‘ulu kiko‘ī. Pi‘i a‘e hiki helu kūpono‘ia māhuahua heluna ia mau wā e ‘ike ‘ia ai kēlā kēia holoholona, ‘o lawa na‘e lāhulu ‘ane halapohe kekahi ālaina. Hō‘ia ‘ekolu koholā halapohe, , puni mokupuni nui ‘ewalu Hawai‘i, ma ho‘owae‘anona pilina loko ‘ikepili ki‘a he ‘umikūmālua makahiki kāohi ‘ana. Ma kilo ‘ana, ua ho‘ohana mākou iwakāluakūmākolu mea hō‘oia hou lālā launa pāpā kālailaina ‘elima lā ‘oko‘a li‘ili‘i loa. Ho‘ohālikelike ikaika ‘eono ha‘ilula loa‘a, ho‘i ‘ekolu, ho‘okahi launa. Loli koana waena mokupuni, ‘elua paha mai kālailai ana. ho‘ohālikelike aku hi‘ohi‘ona ōewe launa, piko pū‘ulu. A laila, pau ho‘oilina ho‘okahi, ‘ē ‘elua, 40 pākēneka. Hiki nō ho‘opū‘ulu wae‘anona ho‘opili pili kuhi hopu kaha ho‘ēmi hopena hana kanaka, la‘a kai lawai‘a.

Язык: Английский

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