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2. A deep learning approach to photo–identification demonstrates high performance on two dozen cetacean species

Author

Patton, Philip T., primary, Cheeseman, Ted, additional, Abe, Kenshin, additional, Yamaguchi, Taiki, additional, Reade, Walter, additional, Southerland, Ken, additional, Howard, Addison, additional, Oleson, Erin M., additional, Allen, Jason B., additional, Ashe, Erin, additional, Athayde, Aline, additional, Baird, Robin W., additional, Basran, Charla, additional, Cabrera, Elsa, additional, Calambokidis, John, additional, Cardoso, Júlio, additional, Carroll, Emma L., additional, Cesario, Amina, additional, Cheney, Barbara J., additional, Corsi, Enrico, additional, Currie, Jens, additional, Durban, John W., additional, Falcone, Erin A., additional, Fearnbach, Holly, additional, Flynn, Kiirsten, additional, Franklin, Trish, additional, Franklin, Wally, additional, Galletti Vernazzani, Bárbara, additional, Genov, Tilen, additional, Hill, Marie, additional, Johnston, David R., additional, Keene, Erin L., additional, Mahaffy, Sabre D., additional, McGuire, Tamara L., additional, McPherson, Liah, additional, Meyer, Catherine, additional, Michaud, Robert, additional, Miliou, Anastasia, additional, Orbach, Dara N., additional, Pearson, Heidi C., additional, Rasmussen, Marianne H., additional, Rayment, William J., additional, Rinaldi, Caroline, additional, Rinaldi, Renato, additional, Siciliano, Salvatore, additional, Stack, Stephanie, additional, Tintore, Beatriz, additional, Torres, Leigh G., additional, Towers, Jared R., additional, Trotter, Cameron, additional, Tyson Moore, Reny, additional, Weir, Caroline R., additional, Wellard, Rebecca, additional, Wells, Randall, additional, Yano, Kymberly M., additional, Zaeschmar, Jochen R., additional, and Bejder, Lars, additional

Published
2023
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3. Occurrence, site fidelity, and associations of oceanic common bottlenose dolphins (Tursiops truncatus) off northeastern New Zealand

Author

Zaeschmar, Jochen R., primary, Tezanos‐Pinto, Gabriela, additional, Dwyer, Sarah L., additional, Peters, Catherine H., additional, Berghan, Jo, additional, Donnelly, David, additional, Meissner, Anna M., additional, Visser, Ingrid N., additional, Weir, Jody S., additional, Judkins, Alastair G., additional, Brough, Tom, additional, Guerra, Marta, additional, Kozmian‐Ledward, Lily, additional, and Stockin, Karen A., additional

Published
2020
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4. False killer whales (Pseudorca crassidens) in New Zealand waters : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Conservation Biology at Massey University, Albany, New Zealand

Author

Zaeschmar, Jochen Reinhard and Zaeschmar, Jochen Reinhard

Abstract

On a global scale, false killer whales (Pseudorca crassidens) remain one of the lesserknown delphinids, with most knowledge about the species originating from infrequent stranding reports. Herein I examine the occurrence, site fidelity and association patterns of false killer whales in the waters of northeastern New Zealand from historic stranding records (1870 to date) and at-seas observations collected between 1995 and 2012. Despite the infrequency of strandings (28 recorded events in 144 years), false killer whales are among the most numerous cetaceans to strand on New Zealand shores due to large mass strandings events. Stranding records suggest that the species occurs predominantly in North Island waters, with only 7% of strandings (n = 2) recorded on South Island shores. Hawkes Bay and the Chatham Islands appear to be stranding hotspots for the species in New Zealand. At-sea encounters support occurrence in northern waters, with all sightings reported in waters off northeastern New Zealand. False killer whales were infrequently encountered in the study area; however, of the 61 distinctive photo-identified individuals, 88.5 % (n = 54) were resighted, with 70.5 % (n = 43) resighted on three or more occasions, with two individuals observed eight times. Eighty-five percent (n = 52) were observed in more than one year and at least two individuals were resighted almost seven years after their initial identification, with movements as far as 650 km documented for eight individuals. Results indicate that all false killer whales photo-identified in the study area so far, are linked in a single social network. Group sizes ranged from 20 to ca. 150 (x¯ = 46.7, SD = 28.48). Distance from shore and bottom depth ranged from < 1 to 67.4 km (x¯ = 9.16, SD = 14.85) and 25 to 350 m (x¯ = 105.33, SD =86.66) respectively, with most records in shallow (< 100 m) continental shelf waters. Occurrence in these nearshore waters is likely seasonal, with all sightings between December and

Published
2014

7. First Record of Predation on False Killer Whales (Pseudorca crassidens) by Killer Whales (Orcinus orca)

Author

Visser, Ingrid N., primary, Zaeschmar, Jochen, additional, Halliday, Jo, additional, Abraham, Annie, additional, Ball, Phil, additional, Bradley, Robert, additional, Daly, Shamus, additional, Hatwell, Tommy, additional, Johnson, Tammy, additional, Johnson, Warren, additional, Kay, Laura, additional, Maessen, Tim, additional, McKay, Vanessa, additional, Peters, Taira, additional, Turner, Nathan, additional, Umuroa, Basil, additional, and Pace, Daniela S., additional

Published
2010
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8. Occurrence of false killer whales ( Pseudorca crassidens) and their association with common bottlenose dolphins ( Tursiops truncatus) off northeastern New Zealand.

Author

Zaeschmar, Jochen R., Visser, Ingrid N., Fertl, Dagmar, Dwyer, Sarah L., Meissner, Anna M., Halliday, Joanne, Berghan, Jo, Donnelly, David, and Stockin, Karen A.

Subjects
FALSE killer whale, BOTTLENOSE dolphin, DELPHINIDAE, FORAGING behavior, ANIMAL social behavior
Abstract

On a global scale, false killer whales ( Pseudorca crassidens) remain one of the lesser-known delphinids. The occurrence, site fidelity, association patterns, and presence/absence of foraging in waters off northeastern New Zealand are examined from records collected between 1995 and 2012. The species was rarely encountered; however, of the 61 distinctive, photo-identified individuals, 88.5% were resighted, with resightings up to 7 yr after initial identification, and movements as far as 650 km documented. Group sizes ranged from 20 to ca. 150. Results indicate that all individuals are linked in a single social network. Most observations were recorded in shallow (<100 m) nearshore waters. Occurrence in these continental shelf waters is likely seasonal, coinciding with the shoreward flooding of a warm current. During 91.5% of encounters, close interspecific associations with common bottlenose dolphins ( Tursiops truncatus) were observed. Photo-identification reveals repeat inter- and intraspecific associations among individuals with 34.2% of common bottlenose dolphins resighted together with false killer whales over 1,832 d. While foraging was observed during 39.5% of mixed-species encounters, results suggest that social and antipredatory factors may also play a role in the formation of these mixed-species groups. [ABSTRACT FROM AUTHOR]

Published
2014
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9. Rare observations of false killer whales ( Pseudorca crassidens) cooperatively feeding with common bottlenose dolphins ( Tursiops truncatus) in the Hauraki Gulf, New Zealand.

Author

Zaeschmar, Jochen R., Dwyer, Sarah L., and Stockin, Karen A.

Subjects
FORAGING behavior, SURVIVAL behavior (Animals), BOTTLENOSE dolphin behavior, FALSE killer whale, BUBBLE dynamics, ANIMAL behavior
Abstract

The article focuses on the joint foraging observed in common bottlenose dolphins and false killer whales in the Hauraki Gulf, New Zealand in January 2011. It notes that false killer whale proximity to the surfacing bubbles observed during the first encounter indicates the production of a minimum of some bubbles and the second encounter confirms bubble emitting by bottlenose dolphins.

Published
2013
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10. False Killers.

Author

ZAESCHMAR, JOCHEN

Abstract

The article offers the author's insights on the long-term relationships of false killer whales with oceanic bottlenose dolphins. The author states that may be food can be a factor for their presence in the coastal area of New Zealand. The author discusses their initial assumptions on the association of bottlenose dolphins with false killer whales and the findings of their study regarding the bite marks on many dolphins. The author also cites the observation on the joint feeding of both species.

Published
2013

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