Ontogenic and seasonal analysis of the diet and isotopic niche of humpback whales in the Magellan Strait, Chile

2021 ◽  
Author(s):  
D Haro ◽  
P Sabat ◽  
J Acevedo ◽  
J Capella ◽  
B Cáceres ◽  
...  
Keyword(s):  
Humpback Whales ◽  
Isotopic Niche ◽  
Magellan Strait ◽  
Seasonal Analysis

First evidence of interchange of humpback whales (Megaptera novaeangliae) between the Magellan Strait and Antarctic Peninsula feeding grounds

Polar Biology ◽  
2021 ◽  
Vol 44 (3) ◽  
pp. 613-619
Author(s):  
Jorge Acevedo ◽  
Juan Capella ◽  
Ted Cheeseman ◽  
Cole C. Monnahan ◽  
Ken Southerland ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Magellan Strait ◽  
Feeding Grounds

Population trends for humpback whales (Megaptera novaeangliae) foraging in the Francisco Coloane Coastal‐Marine Protected Area, Magellan Strait, Chile

2019 ◽  
Vol 35 (4) ◽  
pp. 1212-1231 ◽  
Author(s):  
Cole C. Monnahan ◽  
Jorge Acevedo ◽  
A. Noble Hendrix ◽  
Scott Gende ◽  
Anelio Aguayo‐Lobo ◽  
...  
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
Megaptera Novaeangliae ◽  
Population Trends ◽  
Humpback Whales ◽  
Magellan Strait ◽  
Coastal Marine

Trophic Ecology of Humpback Whales (Megaptera novaeangliae) in the Magellan Strait as Indicated by Carbon and Nitrogen Stable Isotopes

2016 ◽  
Vol 42 (2) ◽  
pp. 233-243 ◽  
Author(s):  
Daniela Haro ◽  
Luciana Riccialdelli ◽  
Jorge Acevedo ◽  
Anelio Aguayo-Lobo ◽  
Américo Montiel
Keyword(s):  
Stable Isotopes ◽  
Trophic Ecology ◽  
Megaptera Novaeangliae ◽  
Humpback Whales ◽  
Nitrogen Stable Isotopes ◽  
Carbon And Nitrogen ◽  
Magellan Strait

Estimating the isotopic niche of males and females of false killer whales (Pseudorca crassidens ) from Magellan Strait, Chile

2018 ◽  
Vol 35 (3) ◽  
pp. 1070-1082 ◽  
Author(s):  
Daniela Haro ◽  
Luciana Riccialdelli ◽  
Olivia Blank ◽  
Ricardo Matus ◽  
Pablo Sabat
Keyword(s):  
Isotopic Niche ◽  
Killer Whales ◽  
Magellan Strait ◽  
Males And Females ◽  
Pseudorca Crassidens

Estimates of Fuegian sprat consumption by humpback whales in the Magellan Strait feeding area as predicted by a bioenergetic model

2021 ◽  
Vol 657 ◽  
pp. 223-239
Author(s):  
J Acevedo ◽  
J Urbán
Keyword(s):  
Fishery Management ◽  
Energy Requirement ◽  
Seasonal Abundance ◽  
Humpback Whales ◽  
Bioenergetic Model ◽  
Marine Predator ◽  
Magellan Strait ◽  
Annual Population ◽  
Feeding Area ◽  
Conservation Plans

Knowing the biomass of prey consumed by a marine predator is a prerequisite for assessing the potential of the predator for competition with fisheries. Here, we estimated the biomass of Fuegian sprat Sprattus fueguensis consumed annually by a small subpopulation of humpback whales Megaptera novaeangliae in the Magellan Strait feeding area. We used a velocity-dependent bioenergetic model that integrates annual energy requirements by sex, age class, and reproductive status, proportion of Fuegian sprat in the diet, and annual population size of whales. The annual energy required in kcal per individual whale was estimated to be 18.88 × 107 for calves, 27.92 × 107 for adults, 30.71 × 107 for pregnant females, and 42.59 × 107 for lactating females. These estimates result in an energy requirement of 19.32 × 109 and 23.41 × 109 for a seasonal abundance of 78 and 96 whales, respectively. Bayesian dietary mixing models predict that Fuegian sprat represented between 27 and 33% of the diet of the whales. This implies that humpback whales remove between 2965 and 3896 t of Fuegian sprat per year during a feeding period of 120 d. However, if estimates are extended to an abundance of 204 humpback whales during the period 2004-2017, the consumption is elevated to 8167-8383 t yr-1. The estimates provided here are useful to apply as input data for consumption by humpback whales in the Fuegian sprat fishery management as well as for conservation plans of this small and vulnerable feeding subpopulation of humpback whales.

scholarly journals Surface feeding behavior of humpback whales in the Magellan Strait

2011 ◽  
Vol 46 (3) ◽  
pp. 483-490 ◽  
Author(s):  
Jorge Acevedo ◽  
Jorge Plana ◽  
Anelio Aguayo-Lobo ◽  
Luis A Pastene
Keyword(s):  
Feeding Behavior ◽  
Humpback Whales ◽  
Magellan Strait

MIGRATORY DESTINATIONS OF HUMPBACK WHALES FROM THE MAGELLAN STRAIT FEEDING GROUND, SOUTHEAST PACIFIC

2007 ◽  
Vol 23 (2) ◽  
pp. 453-463 ◽  
Author(s):  
Jorge Acevedo ◽  
Kristin Rasmussen ◽  
Fernando Félix ◽  
Cristina Castro ◽  
Martha Llano ◽  
...  
Keyword(s):  
Humpback Whales ◽  
Feeding Ground ◽  
Magellan Strait ◽  
Southeast Pacific

Modeling cetacean habitat use in an urban coastal area in southeastern Brazil

2020 ◽  
Vol 642 ◽  
pp. 227-240
Author(s):  
L Lodi ◽  
R Tardin ◽  
G Maricato
Keyword(s):  
Habitat Use ◽  
Protected Areas ◽  
Linear Models ◽  
Anthropogenic Activities ◽  
Buffer Zone ◽  
Humpback Whales ◽  
Southeastern Brazil ◽  
Major Influence ◽  
Cetacean Species ◽  
Few Data

Most studies of cetacean habitat use do not consider the influence of anthropogenic activities. We investigated the influence of environmental and anthropogenic variables on habitat use by humpback Megaptera novaeangliae and Bryde’s whales Balaenoptera brydei off the coast of the Brazilian city of Rio de Janeiro. Although there are 2 marine protected areas (MPAs) in this area, few data are available on cetacean habitat use or on the overlap of different cetacean species within these MPAs. Our aim was to evaluate the effectiveness of the MPAs and propose a buffer zone to better protect the biodiversity of the study area. We conducted systematic surveys and developed spatial eigenvector generalized linear models to characterize habitat use by the species in the study area. Habitat use by humpback whales was influenced only by depth, whereas for Bryde’s whales there was the additional influence of anthropogenic variables. For Bryde’s whales, which use the area for feeding, sea surface temperature and the distance to anchorages had a major influence on habitat use. We also showed that neither of the MPAs in the study area adequately protects the hotspots of either whale species. Most of the humpback whale grid cells with high sighting predictions were located within 2 km of the MPAs, while areas of high sighting prediction of Bryde’s whales were located up to 5 km from the MPAs, closer to beaches. Our findings provide important insights for the delimitation of protected areas and zoning of the MPAs.

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