Stomach contents of common dolphin (<i>Deiphinus</i>sp.) from New Zealand waters

Meynier, Laureline; Stockin, Karen A.; Bando, Monica Kaho Herkules; Duignan, Pádraig J.

doi:10.1080/00288330809509952

Cited by 36 publications

(32 citation statements)

References 25 publications

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“…Digestion codes were assigned to retrieved prey items (following Meynier et al 2008), and prey species were identified to the lowest possible taxonomic level using published guides (Paulin et al 1989). Individual prey items were counted, identified and individually weighed (to within 0.1 g when possible), and fork lengths (FL) of fish and mantle lengths of cephalopods were measured (to within 0.1 mm) using callipers.…”

Section: Prey Composition Of Dietmentioning

confidence: 99%

Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

et al. 2016

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Farewell Spit gannetry in New Zealand. Our results showed intra-and inter-specific variation in the protein, lipid and water composition of prey captured by our sample of 111 Australasian gannets. In addition, we observed significant differences in the Australasian gannets' nutritional niche between seasons. We provide evidence of sex-specific macronutrient foraging strategies in a successful marine predator in the wild. We have shown that in spite of fluctuations in the nutritional composition of foods available to Australasian gannets, males consistently capture prey with higher protein-to-lipid ratios and lower lipid-to-water ratios than females. These results aid to better understand the evolutionary relationship between macronutrient selection and sex-specific traits in wild animals. They also suggest an incentive for these predators to combine individually imbalanced but nutritionally complementary foods to achieve dietary balance, further highlighting the likelihood that prey selection is guided by the balance of macronutrients, rather than energy alone.

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Section: Prey Composition Of Dietmentioning

confidence: 99%

Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

et al. 2016

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“…Of approximately 30 odontocete species occurring in New Zealand waters, the diets of only three others have been described: sperm whale, Physeter macrocephalus (Gaskin & Cawthorn 1967;Clarke & MacLeod 1982;Clarke & Roper 1998;Gomez-Villota 2007); pygmy sperm whale, Kogia breviceps (Beatson 2007); and common dolphin, Delphinus sp. (Meynier et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Stomach contents of long‐finned pilot whales,Globicephala melas, mass‐stranded on Farewell Spit, Golden Bay in 2005 and 2008

Beatson

O’Shea

2009

New Zealand Journal of Zoology

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New data are reported on the diet of the long-finned pilot whale, Globicephala melas, based on stomach contents recovered from whales involved in a mass stranding on Farewell Spit, Golden Bay, South Island, on 23 January 2008. The stomachs of 11 whales were examined, from which identifiable prey remains were recovered from six, four females and two males (3.1-5.4 m in length). Prey remains comprised exclusively cephalopod beaks (1-46 beaks per whale), attributed to two genera in two orders: arrow squid, Nototodarus spp. (Teuthoidea: Ommastrephidae), and common octopus, Pinnoctopus cordiformis (Octopoda: Octopodidae). The stomachs of eight whales were infested with parasitic nematodes, with two ulcerated; the stomachs of five whales did not contain any prey remains. These data complement and are comparable to the only other information available for this species from this region, reported from whales mass-stranded at this same location in December 2005. Lower beak rostral length versus mantle length and biomass regression equations for Nototodarus spp. are reviewed, highlighting the importance of the use of species-specific regression equations for reconstructing both cephalopod mantle length and biomass from lower beak remains in dietary studies.

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“…While small groups of common dolphin are present year-round in shallow waters (20 m depth) in some regions [20], they generally exhibit seasonal inshore/offshore movement, residing in coastal waters during spring and summer, before moving further offshore during autumn [20]. Their inshore/offshore migration also occurs on a diel basis, which seems to correspond with the exploitation of different food sources and the movement of prey [25].…”

Section: Introductionmentioning

confidence: 99%

“…), anchovy ( Engraulis australis ), and arrow squid ( Nototodarus spp.) [25]. Their prey preference makes common dolphin susceptible to trawl fisheries targeting the same species [32].…”

Section: Introductionmentioning

confidence: 99%

Common Dolphin (Delphinus delphis) Bycatch in New Zealand Commercial Trawl Fisheries

2013

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Marine mammals are regularly reported as bycatch in commercial and artisanal fisheries, but data are often insufficient to allow assessment of these incidental mortalities. Observer coverage of the mackerel trawl fishery in New Zealand waters between 1995 and 2011 allowed evaluation of common dolphin Delphinus delphis bycatch on the North Island west coast, where this species is the most frequently caught cetacean. Observer data were used to develop a statistical model to estimate total captures and explore covariates related to captures. A two-stage Bayesian hurdle model was used, with a logistic generalised linear model predicting whether any common dolphin captures occurred on a given tow of the net, and a zero-truncated Poisson distribution to estimate the number of dolphin captures, given that there was a capture event. Over the 16-year study period, there were 119 common dolphin captures reported on 4299 observed tows. Capture events frequently involved more than one individual, with a maximum of nine common dolphin observed caught in a single tow. There was a peak of 141 estimated common dolphin captures (95% c.i.: 56 to 276; 6.27 captures per 100 tows) in 2002–03, following the marked expansion in annual effort in this fishery to over 2000 tows. Subsequently, the number of captures fluctuated although fishing effort remained relatively high. Of the observed capture events, 60% were during trawls where the top of the net (headline) was <40 m below the surface, and the model determined that this covariate best explained common dolphin captures. Increasing headline depth by 21 m would halve the probability of a dolphin capture event on a tow. While lack of abundance data prevents assessment of the impact of these mortalities on the local common dolphin population, a clear recommendation from this study is the increasing of headline depth to reduce common dolphin captures.

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Stomach contents of common dolphin (Deiphinussp.) from New Zealand waters

Cited by 36 publications

References 25 publications

Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

Sex-specific macronutrient foraging strategies in a highly successful marine predator: the Australasian gannet

Stomach contents of long‐finned pilot whales,Globicephala melas, mass‐stranded on Farewell Spit, Golden Bay in 2005 and 2008

Common Dolphin (Delphinus delphis) Bycatch in New Zealand Commercial Trawl Fisheries

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