Las evaluaciones se realizaron del 20 al 30 de marzo 2014 en la isla Lobos de Tierra (6°25,96’S; 80°52,27’O) ubicada a 11,4 km de la costa. La isla tiene influencia de la corriente fría de Humboldt y la corriente cálido-ecuatorial. Se realizaron censos gráficos, cálculos de áreas de algunas subcolonias con GPS in situ y censos por mar. En tierra las especies de aves más frecuentes fueron camanay, piquero y guanay. Se registraron seis subcolonias reproductivas de camanay y dos de piquero, nueve subcolonias en aposentamiento de piquero y cinco de guanay. Se observaron pequeñas congregaciones de pelícanos reproductivos con pichones en el lado nororiental de la isla. El camanay se encontró en toda la isla iniciando el comportamiento de cortejo. En el censo marino se registraron doce especies, más abundantes fueron guanay y camanay. La mayor abundancia de aves se registró en ...

El objetivo de la publicación es determinar abundancia y distribución de mamíferos marinos y su relación con la abundancia de presas y condiciones ambientales en el Estrecho de Bransfield y alrededores de isla Elefante durante la Campaña Antar XXVI. Los avistamientos fueron realizados por dos observadores entre el 31 de diciembre 2018 y 15 de enero 2019 en el puente de mando del BAP Carrasco durante las horas de luz (06:00 – 22:00), siguiendo un trayecto determinado por el Imarpe. Se observaron 323 cetáceos; de cuatro especies identificadas, la más abundante fue la ballena jorobada Megaptera novaeangliae, con 134 avistamientos y 207 individuos; las otras especies identificadas fueron: ballena de aleta Balaenoptera physalus (31 avistamientos, 49 individuos), calderón de aleta larga o ballena piloto Globicephala melas (1 avistamiento, 25 individuos) y orca Orcinus orca (1 avistam...

El objetivo fue describir el estado poblacional del lobo fino Arctocephalus australis en la costa peruana entre 2016 y 2019, mediante estimación de parámetros como éxito reproductivo y variabilidad anual. Los censos poblacionales se realizaron por conteo directo en las loberías del litoral, en la temporada reproductiva de la especie (noviembre – diciembre). La población mínima estimada en promedio fue 8475,3 ± 861,9 individuos (n=4). La mayor concentración se presentó en la zona sur (~91,9% de la población registrada), siendo las localidades más importantes: Punta San Juan (15°21’46’’S, 75°11’36’’O) en Marcona (~37,8%) y Punta Coles (17°42’10’’ S, 71°22’51’’ O) en Ilo (~24,2%). La abundancia de la zona centro (11°-14°S) representó el ~7,7% de individuos registrados en 2016-2019. La colonia de isla Foca (5°12’S – 81°12’S) en Piura es la ...

Boletín IMARPE vol.31, nº 2, 2016; p. 223-228

This paper describes the use of RPA technology as a complementary method during Southern sea lions (Otaria flavescens) counting in Chincha Sur Island, Ica – Peru, as part of the activities scheduled by the Instituto del Mar del Perú (IMARPE). Colonies of these pinnipeds were mapped and its subsequent classification in the Systems of Geographic Information was carried out in order to make comparisons between direct counting on the field and RPA mapping counts. Total values by direct counting and orthophotos were 2300 and 2700 individuals, respectively. While no significant differences were found between the two methods, by means of digital counting, a better detail of the number of individuals on the females and pups categories could be achieved. The use of RPA constitutes a valuable tool that provides geographical reference of each individual and enables repetitions of the counts by d...

This paper describes the use of RPA technology as a complementary method during Southern sea lions (Otaria flavescens) counting in Chincha Sur Island, Ica – Peru, as part of the activities scheduled by the Instituto del Mar del Perú (IMARPE). Colonies of these pinnipeds were mapped and its subsequent classification in the Systems of Geographic Information was carried out in order to make comparisons between direct counting on the field and RPA mapping counts. Total values by direct counting and orthophotos were 2300 and 2700 individuals, respectively. While no significant differences were found between the two methods, by means of digital counting, a better detail of the number of individuals on the females and pups categories could be achieved. The use of RPA constitutes a valuable tool that provides geographical reference of each individual and enables repetitions of the counts by d...

En noviembre – diciembre 2013 se efectuó la evaluación de mamíferos marinos en el sitio piloto de las islas Chincha y Ballestas. En las islas Ballestas, se observaron 126 ejemplares de lobo chusco Otaria flavescens (Shaw, 1800), 48% se encontró en la playa La Maternidad de la isla Ballestas norte. En la isla Chincha norte, se registraron 71 individuos de lobo fino Arctocephalus australis (Zimmermann, 1783), de los cuales 10 fueron crías nacidas en el 2013. Las especies con mayor frecuencia de observación fueron O. flavescens (94,29%) y Tursiops truncatus (Montagu, 1821) (5,71%).

The purpose of this study was to evaluate variation of superficial morphology, histological structure and enamel color of vestibular side of anterior dental pieces exposed to different carbamide peroxide concentrations and exposure times. Our research was taken on 21 extracted teeth that where divided in three groups and subjected to different concentrations of carbamide peroxide gel which were : Group 1 with 5% concentration, group 2 with 10% concentration and group 3 with 20% concentration. The vestibular side of each tooth was divided into 4 sections, each of which ones was exposed to 5, 20 and 40 hours of whitening respectively, while the remaining section was the control group. The results were subjected to the Friedman test to establish statistical differences. It was concluded that morphologically, variations on the surface aspect were minimal with 5% concentration gel during 5, 2...

The purpose of this study was to evaluate variation of superficial morphology, histological structure and enamel color of vestibular side of anterior dental pieces exposed to different carbamide peroxide concentrations and exposure times. Our research was taken on 21 extracted teeth that where divided in three groups and subjected to different concentrations of carbamide peroxide gel which were : Group 1 with 5% concentration, group 2 with 10% concentration and group 3 with 20% concentration. The vestibular side of each tooth was divided into 4 sections, each of which ones was exposed to 5, 20 and 40 hours of whitening respectively, while the remaining section was the control group. The results were subjected to the Friedman test to establish statistical differences. It was concluded that morphologically, variations on the surface aspect were minimal with 5% concentration gel during 5, 2...