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Your search keyword '"Santos, María Begoña"' showing total 3 results
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3 results on '"Santos, María Begoña"'

1. Diet of striped dolphins (Stenella coeruleoalba) in southern Spanish waters.

Author

Saavedra, Camilo, García‐Polo, Manuel, Giménez, Joan, Mons, José Luis, Castillo, Juan José, Fernández‐Maldonado, Carolina, de Stephanis, Renaud, Pierce, Graham John, and Santos, María Begoña

Subjects
STRIPED dolphin, DOLPHINS, DIET, PREY availability, SQUIDS, STOMACH
Abstract

Identifiable food remains were analyzed from 46 stomachs of striped dolphins (Stenella coeruleoalba) stranded in southern Spain between 2007 and 2014. Results suggest that the species feeds mainly on mesopelagic and neritic fish, but also on oceanic squids. Fish species of the family Myctophidae were the main prey in terms of numerical importance and reconstructed prey weight (62% N and 29% W), followed by squids of the family Ommastrephidae (20% W) and bogue (Boops boops) (15% W). The most important prey taxa according to the General Importance Index (GII) were C. maderensis, Ommastrephidae gen. spp., Notoscopelus spp., and M. punctatum. Higher number of mesopelagic myctophids were found in dolphins from the Mediterranean (73% vs. 29% N), while more demersal gobiids and European hake (Merluccius merluccius) were found in those from the Atlantic (44% vs. 1% and 8% vs. <1% N), where a more varied diet was also observed. Differences were also seen in the seasonal importance of some prey, as well as between years, sexes, and maturity states. The diet composition suggests that most of feeding occurred in oceanic regions, during twilight and night hours, while the observed dietary variation may reflect differences in topography, and changes in the prey availability. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Analysis of historical and recent diet and strandings of sperm whales, Physeter macrocephalus, in the North Sea

Author

Pierce, Graham John, Ward, N., Brownlow, Andrew, and Santos, María Begoña

Subjects
stranding, sea surface temperature, Centro Oceanográfico de Vigo, Boreoatlantic armhook squid, land surface temperature, stomach contents analysis, Pesquerías, sperm whale, diet
Abstract

The increasing frequency of sperm whale (Physeter macrocephalus) strandings during the winter in the North Sea has resulted in many theories about why this phenomenon occurs. Using a newly updated catalogue of North Sea sperm whale strandings, the possible roles of environmental drivers, which might affect the entry of migrating sperm whales into the North Sea and/or their stranding, were investigated using generalised additive mixed models. Little or no evidence was found of effects of sunspot activity, the North Atlantic Oscillation (NAO) Index or sea surface pressure around Iceland (a component of the NAO) on the occurrence of strandings. Several sea and land surface temperature indices were positively correlated with the occurrence of strandings. There is evidence of changing relationships between strandings and environmental variables during the last three decades and, given the absence of an obvious mechanism by which the temperature-strandings link might operate, it is important to recognise that several different processes may contribute to the strandings, including the recovery of the sperm whale population following the cessation of commercial whaling in the late 20th century. In addition, and since temperature could also be affecting the whales´ prey and changes in prey distribution could explain whale stranding patterns, this paper updates previous studies of diet, confirming the continued dominance of the Boreoatlantic armhook squid Gonatus fabricii in stomach contents of sperm whales stranded on North Sea coasts, although remains of small numbers of North Sea species were also found, suggesting some feeding within the North Sea

Published
2018

3. Squid predation by slender sunfish Ranzania laevis (Molidae)

Author

Nyegaard, Marianne, Loneragan, N., and Santos, María Begoña

Subjects
fish, breaching, crustaceans, Octopoteuthis, Centro Oceanográfico de Vigo, beak, Pesquerías, predation, Ommastrephidae, diet
Abstract

In addition to crustaceans, remains from 17 individual squid were found in the stomach of a 58 cm slender sunfish Ranzania laevis from Australia, adding a new prey item to their little studied diet. Taken together with existing data from the literature, crustaceans appear to be a common prey item, with larger R. laevis (26–65 cm) also taking small fish and squid. Along with new documentation on breaching, the unexpected finding of squid in the stomach confirms that these fish are fast and agile predators., SI

Published
2017

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