Jaime Ojeda

Jaime Ojeda
University of Magallanes | UMAG · Departamento de Ciencias y Recursos Naturales

PhD candidate

About

123
Publications
26,775
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611
Citations
Citations since 2017
38 Research Items
456 Citations
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2017201820192020202120222023020406080100
2017201820192020202120222023020406080100

Publications

Publications (123)
Article
Full-text available
Egg masses of the Patagonian squid Doryteuthis (Amerigo) gahi attached to giant kelp (Macrocystis pyrifera) in the Magellanic channels of the sub-Antarctic ecoregion in southern South America is documented for the first time. Of seven egg masses observed between 2008 and 2011, one was taken to the laboratory to be analysed and photographed. Compris...
Conference Paper
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In order to effectively address the problems derived from global environmental change, environmental scientists, citizens and decision-makers now recognize the need to integrate more fully the human or social component into ecological research. We propose that to achieve this integration, Long-Term Socio-Ecological Research (LTSER) networks offer a...
Article
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Interactions between seabirds and commercial fishing activities have been well documented but little information is available regarding the impacts of more traditional fishing practices on seabird populations. We interviewed fishermen, administered questionnaires, and made field-based observations to determine the extent to which artisanal fisherie...
Article
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The fjords and channels of southern Chile represent breeding and feeding areas for sub-Antarctic seabird species. In addition, in these environments, an important artisanal austral hake Merluccius australis longline fishery operates. Studies on the relationship between seabirds and this activity are fundamental for the ecology and conservation biol...
Article
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Throughout human history, Indigenous and local communities have stewarded nature. In the present article, we revisit the ancestral principle of reciprocity between people and nature and consider it as a conceptual intervention to the current notion of ecosystem services commonly used to inform sustainability transformation. We propose the concept o...
Book
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El presente libro recorre los meandros relacionales entre pescadores y la merluza austral en canales y fiordos subantárticos de Magallanes. La fotografía documental devela otros ángulos de estas relaciones con narrativas visuales, esfuerzos, aventuras, riquezas y saberes. Al mismo tiempo, estas imágenes relatan las tensiones socio-ecológicas y prob...
Article
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To contribute to achieving local and global sustainability, we propose a novel educational methodology, called field environmental philosophy (FEP), which orients ecotourism practices to reconnect citizens and nature. FEP is based on the systemic approach of the biocultural ethic that values the vital links among the life habits of co-inhabitants (...
Article
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Two species of scallop, Austrochlamys natans (“ Ostión del Sur ”) and Zygochlamys patagonica (“ Ostión patagonico ”) are presently exploited in the southern part of the Magallanes Province (MP). The lack of clarity in taxonomic identification and ecological aspects is generating both erroneous extraction statistics and an unperceived harvesting pre...
Article
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Las reservas de la biosfera tienen entre sus funciones apoyar la investigación científica, educación, capacitación y monitoreo. En la Reserva de la Biosfera Cabo de Hornos (RBCH), creada el año 2005, estas funciones se han cumplido desde la conformación del Parque Etnobotánico Omora el año 2000 y con su implementación, el año 2008, como sitio co-fu...
Article
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During a 2007 expedition dedicated to study kelp diversity within the Magellanic region, specimens of Lessonia Bory with corrugate, yellowish blades were found along the Beagle Channel. This type of corrugated Lessonia is uncommon, with exception of two species from New Zealand. Three possible hypotheses for its origin were explored in this study:...
Article
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1. Indigenous peoples have been monitoring and managing the natural resources in their homelands and waters for millennia. Meanwhile, social-ecological systems thinkers are embracing the capacity of Indigenous knowledge systems, which are informed by land-based practices, to inform adaptive management. 2. Following the collaborative design of a com...
Chapter
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Ecólogos, biólogos de campo, artistas y filósofos ambientales latinoamericanos, europeos y estadounidenses, realizan investigación, educación y conservación biocultural en la Reserva de Biosfera Cabo de Hornos. Interactúan con distintos actores a escala local y regional: descendientes de la etnia Yagán y colonizadores europeos, nuevos residentes y...
Article
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Shifts in species distributions are among the observed consequences of climate change, forcing species to follow suitable environmental conditions. Using species distribution models (SDMs), we aimed at predicting trends in habitat shifts of two seaweed species of commercial interest in the Subantarctic Patagonian region in response to ongoing envir...
Article
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Background The effects of global climate change on species inhabiting marine ecosystems are of growing concern, especially for endemic species that are sensitive due to restricted distribution. One method employed for determining the effects of climate change on the distribution of these organisms is species distribution modeling. Methods We gener...
Article
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The Katalalixar National Reserve (KNR) lies in an isolated marine protected area of Magellan Sub-Antarctic channels, which represent an important area for marine biodiversity and macroalgal conservation. The present study is the first report of the species Lessonia spicata, “huiro negro”, in the Magellan Sub-Antarctic channels. This finding has imp...
Article
The Magellanic Sub-Antarctic Channels ecoregion supports one of the greatest numbers of macroalgae species in South America. In this ecoregion, the majority of macroalgae research has been associated with spatial ecology. In contrast, the temporal scale has received little attention. Here, we report the seasonal changes of taxa richness, wet biomas...
Conference Paper
Plans to reduce the negative impacts of fisheries on ecosystems, often come into conflict with fishermen who hold different experiences and perceptions on biodiversity. We interviewed fishermen along 2,400 km of the Humboldt Current System (HCS), assessing their perceptions of the impacts of marine megafauna on fishing, and proposals to reduce conf...
Article
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The environment of the sub-Antarctic ecoregion of Magallanes is highly heterogenous due to the influence of three oceans (Pacific, Atlantic, and Southern) and the effects of postglacial events such as the Last Glacial Maximum. In the sub-Antarctic ecoregion of Magallanes, the presence of two morphotypes of Durvillaea antarctica has recently been re...
Article
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The region ofMagallanes has the world’s largest sub-Antarctic environments, including the heterogeneous habitats of archipelagos, fjords, channels, and inlets formed by ice advancing and retreating during Quaternary glacial processes. In marine ecosystems, the temperature, salinity, and photoperiod are key parameters which delimit the survival, rep...
Article
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La Reserva de la Biosfera Cabo de Hornos (RBCH) es la más grande de Chile e integra ecosistemas marinos y terrestres, e incluye tres parques nacionales (PN): PN Cabo de Hornos, PN Alberto de Agostini y PN Yendegaia. Se encuentra inmersa dentro de la ecorregión subantártica de Magallanes, que ha sido identificada como una de últimas áreas prístinas...
Article
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Interactions between algae and herbivores can be affected by various factors, such as seasonality and habitat structure. Among herbivores inhabiting marine systems, species of the order Patellogastropoda are considered key organisms in many rocky coasts of the world. Nacella species are one of the most dominant macroherbivores on the rocky shores o...
Article
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Long-distance dispersal is one of the main drivers structuring the distribution of marine biodiversity. This study reports the first occurrence of Macrocystis pyrifera and Durvillaea antarctica rafts on the southwestern warm temperate coast of the Atlantic Ocean. Our results indicate that an extreme meteo-oceanographic event, characterized by a nor...
Article
We assess biogeographical patterns, population structure and the range of species in the pulmonate genus Siphonaria across the sub-Antarctic. We hypothesized that locally endemic cryptic species will be found across the distribution of these direct-developing limpets in the sub-Antarctic. The sub-Antarctic coasts of the Southern Ocean including Sou...
Article
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Abstract: The coastal areas of the Magellan ecoregion host considerable diversity of macroalgae and mollusks. Indigenous peoples, such as the Yaghan, have developed biocultural interactions with austral coastal ecosystems. This study is an interdisciplinary ecological, ethnoecological and philosophical analysis. It applies the conceptual framework...
Article
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Como testimonio de la historia natural de un territorio, las colecciones biológicas representan un patrimonio de gran valor ecológico, cultural, histórico y científico. La región de canales y fiordos subantárticos de Magallanes presenta alto endemismo, condición especialmen-te manifiesta en taxones como las aves y los moluscos. Si bien la conservac...
Article
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Magellanic Subantarctic channels’ coastal zones have several types of rocky substrate, which might provoke changes in communities’ structure. The present study compared the composition, functional traits and community structure of the low intertidal on two types of rocky substrates (boulders and platforms) during winter and summer on Navarino Islan...
Article
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In order to promote the use of sub-Antarctic macroalgae as food, three species of seaweeds, Macrocystis pyrifera, Pyropia columbina, and Durvillaea antarctica, were used as ingredients in a variety of dishes such as cochayuyo bread, cochayuyo hamburgers, cochayuyo fettuccine, huiro fritters, huiro breadsticks, and luche-parsley pesto. Subsequently,...
Article
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Macrocystis pyrifera (L.) C. Agardh is a species that forms extensive underwater forests along the coastline of the ecoregion of Magellan. There, this alga is exposed to marked variation in photoperiod, temperature, and irradiance, which are modulated by daily and seasonal climatic variations. This study aims to understand the ecophysiological beha...
Article
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The coastal marine ecosystems of the sub-Antarctic ecoregion of Magallanes in southern Chile are strongly characterized by environmental heterogeneity with a unique and high biodiversity of benthic macroalgae. The kelp Durvillaea antarctica (Phaeophyceae) is abundant in the intertidal in this region. Two morphotypes, one with elongated-cylindrical...
Article
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In this paper we evaluated the composition and abundance of molluscs associated with beds of the red algae Gigartina, located in the South Shetland Islands (Antarctic Peninsula) and the Strait of Magellan (southern Chile). During the summer season of 2013, samples were obtained by scuba diving using a 0.25 m² quadrat, arranged randomly within the b...
Article
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Seasonal environmental changes may significantly influence macroalgal diversity and biomass. Cryptogam species richness increases towards the poles, especially in sub-Antarctic environments. Yet, subpolar seaweed biodiversity and ecophysiology remain understudied even though it is essential for the management and sustainability of endemic species o...
Article
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The external morphometrics of shell and radula morphology were performed in two species of micromollusks of the genus Eatoniella in Navarino Island, Chile. A total of 50 specimens of E. picea and 72 of E. nigra were analyzed. These species have similar morphology, but E. picea has a smaller diameter/length ratio (0.53 ± 0.02) than E. nigra (0.61 ±...
Article
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RESUMEN En Chile los armadillos Zaedyus pichiy (Desmarest, 1804) y Chaetophractus villosus (Desmarest, 1804) tienen poblaciones periféricas restringidas a planicies de altura y estepa patagónica en la vertiente occidental de la Cordillera de los Andes, donde además han sido escasamente estudiadas. En este trabajo entregamos información sobre los há...
Article
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Glacial episodes of the Quaternary, and particularly the Last Glacial Maximum (LGM) drastically altered the distribution of the Southern-Hemisphere biota, principally at higher latitudes. The irregular coastline of Patagonia expanding for more than 84.000 km constitutes a remarkable area to evaluate the effect of Quaternary landscape and seascape s...
Article
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The emergent demand for carrageenan by Chilean and global industries caused increasing extraction pressures on natural populations of 'red luga', Gigartina skottsbergii, displacing fishing effort from 41°S to the southernmost region of Chile (54-56 °S). Despite the knowledge generated in the biology of G. skottsbergii, unknown the flora associated...
Article
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Knowledge about the marine malacofauna in the Magellan Region has been gained from many scientific expeditions that were carried out during the 19th century. However, despite the information that exists about molluscs in the Magellan Region, there is a lack of studies about assemblages of molluscs co-occurring with macroalgae, especially commercial...