Rare observations of false killer whales (<i>Pseudorca crassidens</i>) cooperatively feeding with common bottlenose dolphins (<i>Tursiops truncatus</i>) in the Hauraki Gulf, New Zealand

Zaeschmar, Jochen R.; Dwyer, Sarah; Stockin, Karen A.

doi:10.1111/j.1748-7692.2012.00582.x

Cited by 25 publications

(23 citation statements)

References 17 publications

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“…The observations of predation on kahawai, a schooling coastal species endemic to areas within temperate Australasian waters (Paulin ), has previously been described in the study area (Zaeschmar et al . ), but have so far not been documented from other regions. Additionally, individual false killer whales observed to be feeding on coastal fish species were also observed to be feeding on hapuku in offshore waters.…”

Section: Discussionmentioning

confidence: 94%

“…, Best and Reeb , Zaeschmar et al . ). However, although bottlenose dolphin and false killer whale associations are reported previously in the literature and are considered relatively common (Reeves et al .…”

Section: Discussionmentioning

confidence: 97%

“…), very few studies have so far attempted to elucidate the possible extent and function of these associations (Zaeschmar et al . ). Associations (of any duration) between cetaceans are often linked to prey occurrence (Bearzi ).…”

Section: Discussionmentioning

confidence: 97%

“…, Zaeschmar et al . ). While increased foraging success and predator detection and/or avoidance are suggested as possible factors in the formation of these mixed‐species groups (Zaeschmar et al .…”

mentioning

confidence: 97%

“…While increased foraging success and predator detection and/or avoidance are suggested as possible factors in the formation of these mixed‐species groups (Zaeschmar et al . ), the exact nature and extent of such interactions remain unclear.…”

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confidence: 99%

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

Zaeschmar

Visser²,

Fertl³

et al. 2013

Marine Mammal Science

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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.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

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confidence: 97%

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confidence: 99%

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