Notes: FOOD AND PARASITES FROM TWO HOURGLASS DOLPHINS, <i>LAGENORHYNCHUS CRUCIGER</i> (QUOY AND GAIMARD, 1824), FROM PATAGONIAN WATERS

Fernández, Mercedes; Berón-Vera, Bárbara; García, Néstor; Raga, Juan Antonio; Crespo, Enrique A.

doi:10.1111/j.1748-7692.2003.tb01133.x

Cited by 18 publications

(14 citation statements)

References 2 publications

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“…Its basic biology and trophic ecology are poorly known due to its oceanic behavior and the small number of specimens found dead on beaches (Brownell and Donahue , Fernández et al . , Jefferson et al . ).…”

Section: Combination Of Vertebral Features In Flexible and Stable Arementioning

confidence: 96%

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Can habitat characteristics shape vertebral morphology in dolphins? An example of two phylogenetically related species from southern South America

Marchesi

Mora

Pimper

et al. 2017

Marine Mammal Science

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Fast swimming pelagic cetacean species have osteological characteristics that promote a more stable spine in comparison to that of coastal species. The Peale's dolphin (Lagenorhynchus australis) and the hourglass dolphin (Lagenorhynchus cruciger) have a close phylogenetic relationship and are found in coastal and pelagic waters in the Southern Hemisphere, respectively. The aim of this work was to study the relationship between the vertebral column's morphology and its flexibility, across these species of contrasting habitats. Vertebral counts and multiple measurements of each vertebra were used to infer intervertebral flexibility. Bivariate plots and discriminant multivariate analyses were employed to compare each functional region along the vertebral column. Both species displayed a regionalization of the column into three stable regions and two flexible areas, which statistically differ in the proportion of the skeleton occupied in each species. While the Peale's dolphin has rounder vertebrae, associated with higher flexibility, the hourglass dolphin has disk‐shaped vertebrae and strongly inclined processes related to high stability. Although the species are closely related phylogenetically, vertebral morphology is influenced by a diverse set of ecological and behavioral factors, reflecting a high degree of vertebral plasticity within the genus.

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Section: Combination Of Vertebral Features In Flexible and Stable Arementioning

confidence: 96%

“…, Fernández et al . ). Sightings of this species have been mainly reported for areas where water depths are greater than 1,500 m (Goodall , Santora ).…”

Section: Combination Of Vertebral Features In Flexible and Stable Arementioning

confidence: 97%

Can habitat characteristics shape vertebral morphology in dolphins? An example of two phylogenetically related species from southern South America

Marchesi

Mora

Pimper

et al. 2017

Marine Mammal Science

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show abstract

“…In this region, krill are the principal prey for many species of fish, squid, seabirds and marine mammals, and they tend to concentrate with fronts (Atkinson et al 2008). However, while no dietary information exists for hourglass dolphins near the South Shetland Islands, stomach contents of specimens from southern South America indicated that myctophids, squids and crustaceans are common prey Fernandez et al 2003;Goodall 2009). Habitat selection by hourglass dolphins near the South Shetland Islands potentially indicates key areas for myctophids and squids in this region (Santora and Brown 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Very little is known about its habitat, dietary preferences and interactions with other cetaceans (Ashford et al 1996;Goodall et al 1997;Fernandez et al 2003;Goodall 2009). In the southwest Atlantic, localized concentrations have been documented around the southern tip of South America, Falkland Islands and South Georgia (Goodall 1997;Goodall et al 1997;White et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica

Santora

2011

Polar Biol

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The hourglass dolphin Lagenorhynchus cruciger is the only regularly occurring small delphinid found south of the Antarctic Polar Front, yet little is known about its ecology and habitat use. This study uses 8 years (14 cruises) of standardized shipboard surveys during January-March (2003-2011 in southern Drake Passage near the South Shetland Islands to summarize the spatial distribution of hourglass dolphin sightings and quantify habitat use. Sighting data are linked to bathymetry (depth, slope) and distance to the average location of oceanographic features. A generalized linear model is used to examine the relationships between sightings and habitat features. Hourglass dolphins were sighted on 50% of surveys (n = 29); sightings were concentrated in February. Group size tended to be 2-6 individuals; there were only 2 sightings of larger groups, of 15 and 25 individuals. Sightings were distributed entirely within the deep pelagic waters north of the South Shetland Islands in southern Drake Passage and were closely associated with the southern boundary of the Antarctic Circumpolar Current. Information on occurrence and distribution reported in this study may be useful for refining habitat associations for hourglass dolphins at regional scales in the Southern Ocean.

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“…In the northern region, including Buenos Aires Province and northern Patagonia, P. gastrophilus is shared with franciscana, common, dusky, Commerson's, and bottlenose dolphins, and also with Burmeister's porpoise (Dans et al, 1999;Berón Vera et al, 2000, 2007, 2008. In the southern region, P. delphini also infect pilot, sperm and Gray's beaked whales, spectacled porpoise, Risso's, Fraser's and Hourglass dolphins (Berón Vera et al, 2000Vera et al, , 2008Fernández et al, 2003). The Cestoda Tetrabothrius sp.…”

mentioning

confidence: 96%

Far from home: Record of a vagrant striped dolphin in Patagonia with notes on diet, parasites and age determination

et al. 2011

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a b s t r a c tThe striped dolphin, Stenella coeruleoalba (Meyen, 1833), is a pelagic small cetacean with primary distribution in tropical and subtropical waters. Here, we present a record of a vagrant individual of striped dolphin in Patagonia, out of its distribution range. The animal was 1 year old, measured 148 cm. and weighted 35 Kg. The specimen was classified as immature due to the small development of the epididym and the absence of spermatozoa in testicular smear. Helminths found belong to two families of Cestoda: cysts of Phyllobothrium delphini (Phyllobothriidae) and Tetrabothrius sp. (Tetrabothriidae). In addition, 1 Pholeter gastrophilus (Digenea: Pholeteridae) was collected. In the stomach we found two cephalopod beaks, identified as argentine shortfin squid and lesser shining bobtail and 6 crystallines of non-identified small fishes. This stranding event constitutes the most southern record for the species at the Argentine coast and highlights the importance of systematically recording strandings as an integral part of any program aimed at monitoring the well-being of local cetacean communities.

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Notes: FOOD AND PARASITES FROM TWO HOURGLASS DOLPHINS, LAGENORHYNCHUS CRUCIGER (QUOY AND GAIMARD, 1824), FROM PATAGONIAN WATERS

Cited by 18 publications

References 2 publications

Can habitat characteristics shape vertebral morphology in dolphins? An example of two phylogenetically related species from southern South America

Can habitat characteristics shape vertebral morphology in dolphins? An example of two phylogenetically related species from southern South America

Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica

Far from home: Record of a vagrant striped dolphin in Patagonia with notes on diet, parasites and age determination

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