scholarly journals Domoic acid in a marine pelagic food web: Exposure of southern right whales Eubalaena australis to domoic acid on the Península Valdés calving ground, Argentina

Harmful Algae ◽  
2017 ◽  
Vol 68 ◽  
pp. 248-257 ◽  
Author(s):  
Valeria C. D’Agostino ◽  
Mariana Degrati ◽  
Viviana Sastre ◽  
Norma Santinelli ◽  
Bernd Krock ◽  
...  
Keyword(s):  
Food Web ◽  
Domoic Acid ◽  
Eubalaena Australis ◽  
Pelagic Food Web ◽  
Right Whales ◽  
Southern Right Whales

scholarly journals Changing patterns of habitat use by southern right whales (Eubalaena australis) on their nursery ground at Península Valdés, Argentina, and in their long-range movements

2020 ◽  
pp. 133-143
Author(s):  
Victoria J. Rowntree ◽  
Roger S. Payne ◽  
Donald M. Schell
Keyword(s):  
Habitat Use ◽  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Small Scale ◽  
Nursery Ground ◽  
Adult Males ◽  
Human Disturbances ◽  
Eubalaena Australis ◽  
Right Whales ◽  
Southern Right Whales

Southern right whales (Eubalaena australis) have been studied on their nursery ground at Península Valdés, Argentina, every year since 1970. Since 1990, 1,208 individuals have been identified from photographs taken during annual aerial surveys; 618 whales were seen in two or more years. Patterns of habitat use have changed during the study in ways which suggest that right whales may be capable of substantial behavioral and ecological flexibility. One male and three females from Península Valdés have been sighted on other nursery grounds (Tristan da Cunha and southern Brazil). Three individuals from Península Valdés were sighted on feeding grounds off Shag Rocks and South Georgia. Some right whales from Península Valdés showed carbon and nitrogen isotope ratios very similar to those seen in right whales off South Africa, while others showed distinctive isotope ratios indicating that they fed in a different area. Whales of all ages and both sexes moved frequently between three major regions of concentration on the Península Valdés nursery ground. Subadults and adult females with calves were resighted at higher rates than adult males and females in non-calf years. Changes in the geographic distribution of whales at the Península include: (1) abandonment of a major region of concentration; (2) establishment of a nursery area adjacent to thecentre of a growing whalewatching industry; and (3) small-scale shifts in distribution, possibly in response to natural and human disturbances.

Southern right whales ( Eubalaena australis ) return to a former wintering calving ground: Fowlers Bay, South Australia

2019 ◽  
Vol 35 (4) ◽  
pp. 1438-1462
Author(s):  
Claire Charlton ◽  
Rhianne Ward ◽  
Robert D. McCauley ◽  
Robert L. Brownell ◽  
Sacha Guggenheimer ◽  
...  
Keyword(s):  
South Australia ◽  
Eubalaena Australis ◽  
Right Whales ◽  
Southern Right Whales

scholarly journals DOMOIC acid, Pseudo-nitzschia spp and potential vectors at the base of the pelagic food web over the northern Patagonian coast, Southwestern Atlantic

2020 ◽  
Vol 212 ◽  
pp. 103448
Author(s):  
Mónica S. Hoffmeyer ◽  
María S. Dutto ◽  
Anabela A. Berasategui ◽  
Maximiliano D. Garcia ◽  
Rosa E. Pettigrosso ◽  
...  
Keyword(s):  
Food Web ◽  
Domoic Acid ◽  
Southwestern Atlantic ◽  
Pelagic Food Web ◽  
Patagonian Coast

scholarly journals Stranding events of southern right whales, Eubalaena australis, in southern Brazil

2020 ◽  
pp. 157-160
Author(s):  
Antonio B. Greig ◽  
Eduardo R. Secchi ◽  
Alexandre N. Zerbini ◽  
Luciano Dalla Rosa
Keyword(s):  
Storm Surges ◽  
Anthropogenic Factors ◽  
Brazilian Coast ◽  
Illegal Hunting ◽  
Right Whale ◽  
Eubalaena Australis ◽  
Marine Traffic ◽  
Right Whales ◽  
Southern Right Whales ◽  
The Right

Although international protection has been granted since 1935, southern right whales have only recently shown signs of recovery, possiblydue to anthropogenic factors. Off Brazil, illegal hunting of right whales occurred until 1973. This paper reports on surveys conducted alongthe southern Brazilian coast and the information recovered on right whale strandings for this area from 1977-1995. In the first 10 years ofthis period only four cases were registered. However, in contrast, 20 cases were counted during the last nine years. These results arediscussed in relation to marine traffic and the fisheries in the area that produce risks of collision and entanglement. Further, the possibilityof storm surges being a preponderant factor in the mortalities in this area is presented. These yearly rates are compared with neighbouringareas that are also inhabited by the right whales. Both possibilities fit the hypothesis that the right whales using the Brazilian coast forbreeding may finally be showing signs of recovery.

scholarly journals A note on an automated system for matching the callosity patterns on aerial photographs of southern right whales

2020 ◽  
pp. 291-295
Author(s):  
Lex Hiby ◽  
Phil Lovell
Keyword(s):  
Random Search ◽  
Automated System ◽  
Aerial Photographs ◽  
Test Set ◽  
Photo Identification ◽  
Eubalaena Australis ◽  
Right Whales ◽  
Southern Right Whales ◽  
Similarity Scores

Photographs showing the callosity patterns of southern right whales (Eubalaena australis) are currently compared by eye to identifyindividuals and monitor their occurrence within certain areas. This paper describes software designed to reduce the number of by eyecomparisons required to maintain each of the existing local photo-identification catalogues. The software is used to extract, from eachphotograph, a viewpoint-independent description of the shape and location of each callosity which generates a parallel catalogue of extracts.This is then compared with the description extracted from each new photograph to generate a list of similarity scores and thus highlightlikely matches. The software can also be used to compare the different catalogues of extracts with each other. Using a test set of 67photographs of 23 whales taken from 1974 to 1986, the software reduced the number of by eye comparisons required to identify allindividuals by 93% when compared with a purely random search.

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