Jorge Acevedo - Profile on Academia.edu (original) (raw)

Papers by Jorge Acevedo

Polar Biology, 2011

The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Pen... more The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Peninsula was examined based on 406 sightings of minke whales recorded during the Chilean Antarctic Scientific Expeditions and other opportunistic cetacean surveys. Identification of the species was made only for the whales sighted in the proximity of the vessels when the specific diagnostic characters could be confirmed. Of

Rev. biol. mar. oceanogr

Abstract.-Surface feeding behavior of 37 identified humpback whales in the Magellan Strait are re... more Abstract.-Surface feeding behavior of 37 identified humpback whales in the Magellan Strait are reported with the aim of describing feeding behavior and investigating whether differences in prey type determine the feeding strategy in this area. A total of three lunging ...

Primer registro osteológico de Delphinus capensis Gray 1828, en la costa de Tarapacá, norte de Chile

RESUMEN: Se entrega información sobre la distribución y el tamaño de la población actual, las cap... more RESUMEN: Se entrega información sobre la distribución y el tamaño de la población actual, las capturas y el estado de conservación de las especies de carnívoros marinos (lobos, focas y nutrias) presentes en todo el litoral sudamericano y antártico del territorio chileno, agrupadas en 7 géneros (Otaria, Arctocephalus, Mirounga, Lobodon, Hydrurga, Leptonychotes y Ommatophoca) y 3 familias (Otariidae, Phocidae y Mustelidae). Además, se resume la legislación nacional para la protección y administración de estos recursos, sus principales problemas de conservación, medidas que se requiere adoptar para enfrentarlos, convenciones y programas suscritos por el país para su protección y entidades nacionales e internacionales responsables de la protección de estas especies.

Revista de Biología Marina y Oceanografía 45(1): 171-176, abril de 2010 Duración del proceso de p... more Revista de Biología Marina y Oceanografía 45(1): 171-176, abril de 2010 Duración del proceso de parición y presentación del feto en el lobo marino común, Otaria flavescens en Punta Negra, Iquique, Chile Time taken for birthing process and fetus presentation in South American sea lion, Otaria flavescens at Punta Negra, Iquique, Chile Abstract.-Here we document the time involved and the influence of fetus orientation in the birthing process of Otaria flavescens.

CARACTERÍSTICAS OCEANOGRÁFICAS Y BIOLÓGICAS DE LAS COMUNIDADES DEL PLANCTON Y NECTON DEL ÁREA MARINA COSTERA PROTEGIDA FRANCISCO COLOANE: UNA REVISIÓN

Anales del Instituto de la Patagonia, 2013

The objective of this study was to make a review of the current state of knowledge on the Coastal... more The objective of this study was to make a review of the current state of knowledge on the Coastal Marine Protected Area (CMPA) Francisco Coloane in terms of the physical and chemical oceanography, the phyto-zooplankton compositions and the fish, birds and marine mammals species present, and provide temperature and salinity data collected during a marine survey carried out the 2012 fall season. Surface temperatures fluctuate etween 2.0 and 9.0°C. Salinity varies between 23 and 30.9 PSU. The most oxygenated waters and those of highest pH were recorded within Seno Ballena (320-340 μmoles Kg-1; 8.11 units of pH). In spring nutrient levels indicate low surface concentrations, except for phosphate, the phytoplankton is dominated by diatoms and the zooplankton is composed of copepods and meroplanktonic larvae with high abundance levels in the Jeronimo Channel. The family of fish most representative is the Nototheniidae, and among marine birds and mammals, the Magellan penguin and the humpback whale are the most sighted. The review indicates that it is necessary to make further studies on physical oceanography and the benthic community of CMPA.

Revista de biología marina y oceanografía, 2008

Polar Biology, 2012

Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.

Registros biológicos atípicos en cabo Shirreff, isla Livingston, Antártica

Bol. Antárt. Chileno, 1998

Ecography, 2008

Historical summer feeding and winter breeding grounds of the eastern Southsoutheast Pacific humpb... more Historical summer feeding and winter breeding grounds of the eastern Southsoutheast Pacific humpback whales (Megaptera novaeangliae) are related to in the west area of the Antarctic Peninsula during the austral summer and off Ecuador and Colombia during the austral winter, respectively. Actually, humpback whales have been observed breeding off Panama and Costa Rica and feeding in Magellan Strait. Migratory destinations of some individuals of this population have been documented, although the specific migratory destination is considerable uncertainty in the mayority of cases. In this study an update of humpback whale movement is made based on photo-identification material collected To determine the migratory relantionship of humpback whales between both feeding areas and the low-latitude breeding and calving areas along the eastern margins of South and Central America, we examine photo-id picture from in two feeding areas (Magellan Strait, Antarctic Peninsula) and three breeding areas (, Ecuador, Colombia and Panama/Costa Rica). Data were collected by different research institutions from countries facing the eastern South Pacific. location, as part of a large effort collaboration between the different authors. A total of 142 humpback whales whales were found between Antarctic Peninsula and wintering sampling areas from Ecuador to Costa Rica, and 14 individuals were found individuals between Magellan Strait and thosee same wintering sampling areas. were found. The proportion of whales identified from Antarctic Peninsula and those from Magellan Strait that had also been seen in the three geographic regions of breeding grounds not varied significantly, suggesting a common breeding range from Ecuador to Costa Rica, however, to compare separately each feeding area, the proportion of whales re-sigthed in three geographic region breeding grounds vary significantly for Antarctic Peninsula and Magellan Strait with highest proportion of re-sighted whales mainly with Colombia and Central America, respectively. Similarly, Despite that the different winter areas could combine into a single western South America sample, the movement observed (based on Movement Index) in SC/60/SH20 the three breeding geographic regions were significantly different than expected for Antarctic Peninsula and for Magellan Strait indicating not random movement throughout the population. Thus, the humpback whales from Magellan Strait show that observed movement were not significantly different than expected with the sampling areas of northern boundary of breeding ground range, whereas that Antarctic whales the observed movement were significantly different between all sampling areas.

Photoidentification comparison of humpback whales from the Antarctic Peninsula/Strait of Magellan and French Polynesia, (Breeding Stock F)

In light of the recent documentation of humpback whale migration between American Samoa and the A... more In light of the recent documentation of humpback whale migration between American Samoa and the Antarctic Peninsula, we undertook a comparison of individual identification photographs from French Polynesia and the Antarctic Peninsula and Strait of Magellan. The French Polynesia catalogue (n=439) spans 1995-2007 seasons, and the Antarctic Peninsula/Strait of Magellan catalogues (n=369) include the 1994/1995 season through the 2007/2008 season.

The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, an... more The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, and migrate south to the Antarctic Area I feeding ground during the austral summer. In recent years humpback whales have been recorded feeding in the Patagonian channels of South America during the summer and fall seasons. Previously, a first migratory link was established between the Magellan Strait

Humpback whales migrate annually between high latitude feeding grounds and low latitude breeding ... more Humpback whales migrate annually between high latitude feeding grounds and low latitude breeding grounds, exhibiting a marked degree of fidelity to migratory destinations. Southeastern Pacific humpback whales migrate between the reproductive area located principally off Ecuador and Colombia and the feeding area located around the Antarctic Peninsula. Previous studies suggested a second feeding area for this population in the Magellan

Polar Biology, 2009

To our knowledge, this paper is the Wrst record/ report of a juvenile light-coloured Weddell seal... more To our knowledge, this paper is the Wrst record/ report of a juvenile light-coloured Weddell seal (Leptonychotes weddellii) at Cape ShirreV, Livingston Island in January 1998, determining that it was an albino individual. Based on available literature, three cases of albino seals have been reported exclusively for Harbour seal pups, and no albino has been reported for Antarctic pagophilic true seals. Therefore, this is the Wrst conWrmed case of albinism in Antarctic pagophilic true seals species, indicating that this phenomenon is indeed of a rare occurrence.

Polar Biology, 2008

We document the inXuence of fetus orientation in the time invested in the birthing process of Ant... more We document the inXuence of fetus orientation in the time invested in the birthing process of Antarctic fur seals at Cape ShirreV, Antarctica. Our results show that breeching was signiWcantly higher than cephalic orientation on the order of 1.5:1. The average duration of the birthing process was 37.26 min, and the average duration considering the fetus orientation was 27.22 and 49.39 min for the cephalic and breech, respectively. The average time was signiWcantly diVerent only in the phase from the appearance of the amniotic-allantoids sac to the complete expulsion of the pup. Possible explanations for this diVerence are: the friction between the opposite hair direction with the uterusvaginal wall after the rupture of amnio-allantoid sac during the transit of the fetus in breech position, and/or the fact one or both front Xippers would increase the scapular diameter and make the Wnal step of fetus delivery more diYcult.

Polar Biology, 2011

The Antarctic fur seal, Arctocephalus gazella, in the eastern South Pacific Ocean, first reported... more The Antarctic fur seal, Arctocephalus gazella, in the eastern South Pacific Ocean, first reported on Hoste Island, Cape Horn in 1973, and then on the Juan Fernandez Archipelago in 1982 and 1983, was recorded again in October and December 2009 on the southern coast of Chile. Three different individuals were seen simultaneously on a single day at Punta Dungenes, Magellan Strait, and a fourth individual was sighted at the northeastern coast of Almirantazgo Sound, Tierra del Fuego. These records represent the first sightings of live Arctocephalus gazella in southern Chile. Although it is difficult to establish both their origin and rationale for dispersion outside of their distribution range, the substantial breeding population recovery in South Georgia and food shortages during the breeding and post-breeding season are suggested as possible explanations.

Polar Biology, 2011

The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Pen... more The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Peninsula was examined based on 406 sightings of minke whales recorded during the Chilean Antarctic Scientific Expeditions and other opportunistic cetacean surveys. Identification of the species was made only for the whales sighted in the proximity of the vessels when the specific diagnostic characters could be confirmed. Of the 406 sightings, 296 were assigned to Antarctic (519 individuals), nine (11 individuals) to dwarf and 101 to unidentified minke whales (149 individuals). Dwarf minke whales were identified by the reported external diagnostic characters for this species. Seven animals occurred around the South Shetland Island and four in the Gerlache Strait. In addition, another two animals were identified as dwarf minke whales in the Bellinghausen Sea in winter 1993, being these the most southern records for this species. These results confirm the occurrence of dwarf minke whales around the Antarctic Peninsula during the summer seasons, as well as in the Bellinghausen Sea in winter. The geographical range of these sightings was comprised between 61°03 0 and 69°25 0 S and between 55°29 0 and 86°53 0 W. These results also suggest that some dwarf minke whales remain in the Antarctic during the austral winter.

Marine Mammal Science, 2007

Photoidentification analysis of humpback whales from three high latitude localities of the Eastern South Pacific Population (Stock G)

The Eastern South Pacific humpback whale population (or stock G) winters primarily off Colombia a... more The Eastern South Pacific humpback whale population (or stock G) winters primarily off Colombia and Ecuador and spend the summer in feeding areas in the Magellan Strait and around the Antarctic Peninsula. In recent years humpback whales have been observed in the northern part of the Chilean Patagonian channels (Corcovado Gulf) during the summer and fall seasons. To investigate whether the Corcovado Gulf represent a feeding area destination for part of the Eastern South Pacific population, or alternatively, a migratory corridor to the more southern Magellan Strait or Antarctic feeding areas, photo- id pictures from the three relevant localities (Corcovado Gulf, Magellan Strait and Antarctic Peninsula), were examined. The absence of matches between the Corcovado Gulf and the Magellan Strait and Antarctic Peninsula suggest that the Corcovado Gulf might be a summer migratory destination for at least part of the Eastern South Pacific population. This result should be considered as prelim...

The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, an... more The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, and migrate south to the Antarctic Area I feeding ground during the austral summer. In recent years humpback whales have been recorded feeding in the Patagonian channels of South America during the summer and fall seasons. Previously, a first migratory link was established between the Magellan Strait feeding area and the primarily wintering grounds off Ecuador and Colombia, but also with new wintering grounds of Panama and Costa Rica. Here we present further evidence of a migratory relationship between the Magellan Strait and Panama, as well as we inform on four new matches between Magellan Strait and Ecuador. In the latter locality the animals have been sighted once on a single occasion, suggesting that they possibly are travelling towards northern waters. We report a re-sighting between the Magellan Strait and Panama which remarkably corresponded to the same matched individual previously...

Polar Biology, 2011

The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Pen... more The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Peninsula was examined based on 406 sightings of minke whales recorded during the Chilean Antarctic Scientific Expeditions and other opportunistic cetacean surveys. Identification of the species was made only for the whales sighted in the proximity of the vessels when the specific diagnostic characters could be confirmed. Of

Rev. biol. mar. oceanogr

Abstract.-Surface feeding behavior of 37 identified humpback whales in the Magellan Strait are re... more Abstract.-Surface feeding behavior of 37 identified humpback whales in the Magellan Strait are reported with the aim of describing feeding behavior and investigating whether differences in prey type determine the feeding strategy in this area. A total of three lunging ...

Primer registro osteológico de Delphinus capensis Gray 1828, en la costa de Tarapacá, norte de Chile

RESUMEN: Se entrega información sobre la distribución y el tamaño de la población actual, las cap... more RESUMEN: Se entrega información sobre la distribución y el tamaño de la población actual, las capturas y el estado de conservación de las especies de carnívoros marinos (lobos, focas y nutrias) presentes en todo el litoral sudamericano y antártico del territorio chileno, agrupadas en 7 géneros (Otaria, Arctocephalus, Mirounga, Lobodon, Hydrurga, Leptonychotes y Ommatophoca) y 3 familias (Otariidae, Phocidae y Mustelidae). Además, se resume la legislación nacional para la protección y administración de estos recursos, sus principales problemas de conservación, medidas que se requiere adoptar para enfrentarlos, convenciones y programas suscritos por el país para su protección y entidades nacionales e internacionales responsables de la protección de estas especies.

Revista de Biología Marina y Oceanografía 45(1): 171-176, abril de 2010 Duración del proceso de p... more Revista de Biología Marina y Oceanografía 45(1): 171-176, abril de 2010 Duración del proceso de parición y presentación del feto en el lobo marino común, Otaria flavescens en Punta Negra, Iquique, Chile Time taken for birthing process and fetus presentation in South American sea lion, Otaria flavescens at Punta Negra, Iquique, Chile Abstract.-Here we document the time involved and the influence of fetus orientation in the birthing process of Otaria flavescens.

CARACTERÍSTICAS OCEANOGRÁFICAS Y BIOLÓGICAS DE LAS COMUNIDADES DEL PLANCTON Y NECTON DEL ÁREA MARINA COSTERA PROTEGIDA FRANCISCO COLOANE: UNA REVISIÓN

Anales del Instituto de la Patagonia, 2013

The objective of this study was to make a review of the current state of knowledge on the Coastal... more The objective of this study was to make a review of the current state of knowledge on the Coastal Marine Protected Area (CMPA) Francisco Coloane in terms of the physical and chemical oceanography, the phyto-zooplankton compositions and the fish, birds and marine mammals species present, and provide temperature and salinity data collected during a marine survey carried out the 2012 fall season. Surface temperatures fluctuate etween 2.0 and 9.0°C. Salinity varies between 23 and 30.9 PSU. The most oxygenated waters and those of highest pH were recorded within Seno Ballena (320-340 μmoles Kg-1; 8.11 units of pH). In spring nutrient levels indicate low surface concentrations, except for phosphate, the phytoplankton is dominated by diatoms and the zooplankton is composed of copepods and meroplanktonic larvae with high abundance levels in the Jeronimo Channel. The family of fish most representative is the Nototheniidae, and among marine birds and mammals, the Magellan penguin and the humpback whale are the most sighted. The review indicates that it is necessary to make further studies on physical oceanography and the benthic community of CMPA.

Revista de biología marina y oceanografía, 2008

Polar Biology, 2012

Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. Th... more Your article is protected by copyright and all rights are held exclusively by Springer-Verlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.

Registros biológicos atípicos en cabo Shirreff, isla Livingston, Antártica

Bol. Antárt. Chileno, 1998

Ecography, 2008

Historical summer feeding and winter breeding grounds of the eastern Southsoutheast Pacific humpb... more Historical summer feeding and winter breeding grounds of the eastern Southsoutheast Pacific humpback whales (Megaptera novaeangliae) are related to in the west area of the Antarctic Peninsula during the austral summer and off Ecuador and Colombia during the austral winter, respectively. Actually, humpback whales have been observed breeding off Panama and Costa Rica and feeding in Magellan Strait. Migratory destinations of some individuals of this population have been documented, although the specific migratory destination is considerable uncertainty in the mayority of cases. In this study an update of humpback whale movement is made based on photo-identification material collected To determine the migratory relantionship of humpback whales between both feeding areas and the low-latitude breeding and calving areas along the eastern margins of South and Central America, we examine photo-id picture from in two feeding areas (Magellan Strait, Antarctic Peninsula) and three breeding areas (, Ecuador, Colombia and Panama/Costa Rica). Data were collected by different research institutions from countries facing the eastern South Pacific. location, as part of a large effort collaboration between the different authors. A total of 142 humpback whales whales were found between Antarctic Peninsula and wintering sampling areas from Ecuador to Costa Rica, and 14 individuals were found individuals between Magellan Strait and thosee same wintering sampling areas. were found. The proportion of whales identified from Antarctic Peninsula and those from Magellan Strait that had also been seen in the three geographic regions of breeding grounds not varied significantly, suggesting a common breeding range from Ecuador to Costa Rica, however, to compare separately each feeding area, the proportion of whales re-sigthed in three geographic region breeding grounds vary significantly for Antarctic Peninsula and Magellan Strait with highest proportion of re-sighted whales mainly with Colombia and Central America, respectively. Similarly, Despite that the different winter areas could combine into a single western South America sample, the movement observed (based on Movement Index) in SC/60/SH20 the three breeding geographic regions were significantly different than expected for Antarctic Peninsula and for Magellan Strait indicating not random movement throughout the population. Thus, the humpback whales from Magellan Strait show that observed movement were not significantly different than expected with the sampling areas of northern boundary of breeding ground range, whereas that Antarctic whales the observed movement were significantly different between all sampling areas.

Photoidentification comparison of humpback whales from the Antarctic Peninsula/Strait of Magellan and French Polynesia, (Breeding Stock F)

In light of the recent documentation of humpback whale migration between American Samoa and the A... more In light of the recent documentation of humpback whale migration between American Samoa and the Antarctic Peninsula, we undertook a comparison of individual identification photographs from French Polynesia and the Antarctic Peninsula and Strait of Magellan. The French Polynesia catalogue (n=439) spans 1995-2007 seasons, and the Antarctic Peninsula/Strait of Magellan catalogues (n=369) include the 1994/1995 season through the 2007/2008 season.

The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, an... more The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, and migrate south to the Antarctic Area I feeding ground during the austral summer. In recent years humpback whales have been recorded feeding in the Patagonian channels of South America during the summer and fall seasons. Previously, a first migratory link was established between the Magellan Strait

Humpback whales migrate annually between high latitude feeding grounds and low latitude breeding ... more Humpback whales migrate annually between high latitude feeding grounds and low latitude breeding grounds, exhibiting a marked degree of fidelity to migratory destinations. Southeastern Pacific humpback whales migrate between the reproductive area located principally off Ecuador and Colombia and the feeding area located around the Antarctic Peninsula. Previous studies suggested a second feeding area for this population in the Magellan

Polar Biology, 2009

To our knowledge, this paper is the Wrst record/ report of a juvenile light-coloured Weddell seal... more To our knowledge, this paper is the Wrst record/ report of a juvenile light-coloured Weddell seal (Leptonychotes weddellii) at Cape ShirreV, Livingston Island in January 1998, determining that it was an albino individual. Based on available literature, three cases of albino seals have been reported exclusively for Harbour seal pups, and no albino has been reported for Antarctic pagophilic true seals. Therefore, this is the Wrst conWrmed case of albinism in Antarctic pagophilic true seals species, indicating that this phenomenon is indeed of a rare occurrence.

Polar Biology, 2008

We document the inXuence of fetus orientation in the time invested in the birthing process of Ant... more We document the inXuence of fetus orientation in the time invested in the birthing process of Antarctic fur seals at Cape ShirreV, Antarctica. Our results show that breeching was signiWcantly higher than cephalic orientation on the order of 1.5:1. The average duration of the birthing process was 37.26 min, and the average duration considering the fetus orientation was 27.22 and 49.39 min for the cephalic and breech, respectively. The average time was signiWcantly diVerent only in the phase from the appearance of the amniotic-allantoids sac to the complete expulsion of the pup. Possible explanations for this diVerence are: the friction between the opposite hair direction with the uterusvaginal wall after the rupture of amnio-allantoid sac during the transit of the fetus in breech position, and/or the fact one or both front Xippers would increase the scapular diameter and make the Wnal step of fetus delivery more diYcult.

Polar Biology, 2011

The Antarctic fur seal, Arctocephalus gazella, in the eastern South Pacific Ocean, first reported... more The Antarctic fur seal, Arctocephalus gazella, in the eastern South Pacific Ocean, first reported on Hoste Island, Cape Horn in 1973, and then on the Juan Fernandez Archipelago in 1982 and 1983, was recorded again in October and December 2009 on the southern coast of Chile. Three different individuals were seen simultaneously on a single day at Punta Dungenes, Magellan Strait, and a fourth individual was sighted at the northeastern coast of Almirantazgo Sound, Tierra del Fuego. These records represent the first sightings of live Arctocephalus gazella in southern Chile. Although it is difficult to establish both their origin and rationale for dispersion outside of their distribution range, the substantial breeding population recovery in South Georgia and food shortages during the breeding and post-breeding season are suggested as possible explanations.

Polar Biology, 2011

The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Pen... more The occurrence of dwarf minke whales (Balaenoptera acutorostrata subsp.) around the Antarctic Peninsula was examined based on 406 sightings of minke whales recorded during the Chilean Antarctic Scientific Expeditions and other opportunistic cetacean surveys. Identification of the species was made only for the whales sighted in the proximity of the vessels when the specific diagnostic characters could be confirmed. Of the 406 sightings, 296 were assigned to Antarctic (519 individuals), nine (11 individuals) to dwarf and 101 to unidentified minke whales (149 individuals). Dwarf minke whales were identified by the reported external diagnostic characters for this species. Seven animals occurred around the South Shetland Island and four in the Gerlache Strait. In addition, another two animals were identified as dwarf minke whales in the Bellinghausen Sea in winter 1993, being these the most southern records for this species. These results confirm the occurrence of dwarf minke whales around the Antarctic Peninsula during the summer seasons, as well as in the Bellinghausen Sea in winter. The geographical range of these sightings was comprised between 61°03 0 and 69°25 0 S and between 55°29 0 and 86°53 0 W. These results also suggest that some dwarf minke whales remain in the Antarctic during the austral winter.

Marine Mammal Science, 2007

Photoidentification analysis of humpback whales from three high latitude localities of the Eastern South Pacific Population (Stock G)

The Eastern South Pacific humpback whale population (or stock G) winters primarily off Colombia a... more The Eastern South Pacific humpback whale population (or stock G) winters primarily off Colombia and Ecuador and spend the summer in feeding areas in the Magellan Strait and around the Antarctic Peninsula. In recent years humpback whales have been observed in the northern part of the Chilean Patagonian channels (Corcovado Gulf) during the summer and fall seasons. To investigate whether the Corcovado Gulf represent a feeding area destination for part of the Eastern South Pacific population, or alternatively, a migratory corridor to the more southern Magellan Strait or Antarctic feeding areas, photo- id pictures from the three relevant localities (Corcovado Gulf, Magellan Strait and Antarctic Peninsula), were examined. The absence of matches between the Corcovado Gulf and the Magellan Strait and Antarctic Peninsula suggest that the Corcovado Gulf might be a summer migratory destination for at least part of the Eastern South Pacific population. This result should be considered as prelim...

The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, an... more The Eastern South Pacific humpback whale population winter primarily off Colombia and Ecuador, and migrate south to the Antarctic Area I feeding ground during the austral summer. In recent years humpback whales have been recorded feeding in the Patagonian channels of South America during the summer and fall seasons. Previously, a first migratory link was established between the Magellan Strait feeding area and the primarily wintering grounds off Ecuador and Colombia, but also with new wintering grounds of Panama and Costa Rica. Here we present further evidence of a migratory relationship between the Magellan Strait and Panama, as well as we inform on four new matches between Magellan Strait and Ecuador. In the latter locality the animals have been sighted once on a single occasion, suggesting that they possibly are travelling towards northern waters. We report a re-sighting between the Magellan Strait and Panama which remarkably corresponded to the same matched individual previously...