Andrea PiñonesUniversidad Austral de Chile · Instituto de Ciencias Marinas y Limnológicas UACh
Andrea Piñones
Doctor of Philosophy
About
24
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Introduction
Skills and Expertise
Publications
Publications (24)
Gracias a los avances significativos en herramientas ecoinformáticas, los registros de
ocurrencia de especies accesibles al público están creciendo rápidamente. Estos
datos representan una variedad de fuentes y han aumentado explosivamente en
número en las últimas tres décadas. Sin embargo, pese a la increíble acumulación de
registros de biodiversi...
La Península Antártica Occidental (PAO) es uno de los sistemas más productivos del planeta. En esta región se han realizado múltiples estudios que relacionan la circulación advectiva con la estructura biológica de las poblaciones de krill antártico (Euphausia superba) a través de modelos matemáticos lagrangianos. Dichos estudios han demostrado la i...
The Antarctic Peninsula ecosystem is extremely sensitive to climatic variability and other anthropogenic perturbances ascribed to biomass extraction by fisheries. An Ecopath with Ecosim model calibrated for the 1996-2012 period was projected into the future (2100) under three different climate projections for environmental variables (sea ice extent...
The Beagle Channel (BC) is a long and narrow interoceanic passage (∼270 km long and 1–12 km wide) with west-east orientation and complex bathymetry connecting the Pacific and Atlantic oceans at latitude 55°S. This study is the first integrated assessment of the main oceanographic features of the BC, using recent oceanographic observations from crui...
During summer 2017 an anomalous and unprecedented developing of warm water off the coast of Chile was presented, namely Coastal El Niño event. Coincidentally, a high amount of strandings of Portuguese Man-of-War (Physalia physalis) were present at that time. In this work we determine the latitudinal and seasonal distribution of the pleustonic sipho...
Temperature and salinity measurements obtained from sensors deployed on Weddell seals (Leptonychotes weddellii) between late austral summer and the following spring for 2010–2012 were used to describe the temporal and spatial variability of hydrographic conditions in the western Ross Sea, with particular emphasis on the inner-shelf region off Victo...
Antarctic krill Euphausia superba, crystal krill E. crystallorophias, and Antarctic silverfish Pleuragramma antarctica are key mid-trophic level species in the Ross Sea, connecting primary production to the upper trophic levels. Distributions of these species were constructed from observations made in the western Ross Sea from 1988 to 2004. Distrib...
Antarctic krill Euphausia superba, crystal krill E. crystallorophias, and Antarctic silverfish Pleuragramma antarctica are key mid-trophic level species in the Ross Sea, connecting primary production to the upper trophic levels. Distributions of these species were constructed from observations made in the western Ross Sea from 1988 to 2004. Distrib...
Climate change is rapidly shaping the living environment of the most abundant keystone species of the Antarctic marine food web, Antarctic krill. Projected future changes for the krill habitat include a sustained increase in ocean temperature and changes in sea ice and chlorophyll a. Here we investigate how these factors affect the early life histo...
Antarctic krill (Euphausia superba) and crystal krill (Euphausia crystallorophias), important components of the Ross Sea food web, differ in their population distribution. The objective of this study was to determine whether these differing distributions result primarily from differences in spawning locations, larval development times, and transpor...
The early life stages of the Antarctic silverfish (Pleuragramma antarctica), an important prey species for higher predators in the Southern Ocean ecosystem, dominate the larval fish assemblages of the Bransfield Strait, one of the most important areas for larval retention off the Antarctic Peninsula. Nevertheless, the spatial location of areas wher...
A one-dimensional, temperature-dependent model was used to simulate the descent–ascent cycle of the embryos and early larval stages of Antarctic krill to determine which regions of the western Antarctic Peninsula (wAP) continental shelf support successful completion of this cycle under present environmental conditions and those projected to occur a...
The abundance and distribution of Antarctic krill Euphausia superba over the western Antarctic Peninsula (wAP) continental shelf suggest that these populations are maintained by inputs from upstream sources via advection of individuals that originated in the Bellingshausen Sea, in addition to local spawning and retention. The objective of our study...
The ocean ecosystems around the west Antarctic Peninsula and South Georgia are two of the best described regional ecosystems of the Southern Ocean. They therefore provide a useful basis for developing comparative analyses of ocean ecosystems around the Antarctic. There are clear and expected differences in seasonality and species composition betwee...
The ocean ecosystems around the west Antarctic Peninsula and South Georgia are two of the best described regional ecosystems of the Southern Ocean. They therefore provide a useful basis for developing comparative analyses of ocean ecosystems around the Antarctic. There are clear and expected differences in seasonality and species composition betwee...
The Western Antarctic Peninsula (WAP) is a site of high krill abundance and a likely source region for krill populations found to the north and east of the area. The U.S. GLOBEC Southern Ocean program studied factors that contribute to the overwintering success of krill in the region of Marguerite Bay, WAP. A MOCNESS net system was used to sample t...
The relative contribution of ocean circulation in producing areas where marine mammals and other predators concentrate to produce biological hot spots along the continental shelf of the western Antarctic Peninsula (wAP) was investigated with numerical Lagrangian particle tracking simulations. Circulation distributions used in the Lagrangian simulat...
Large-scale transport by the Antarctic Circumpolar Current (ACC) can promote spatially complex population structure in the Southern Ocean through advection. Since the unidirectional flow of the ACC is concentrated in fronts that are found around the continent and penetrate to depth, connectivity may be predictable at regional scales. We use predict...
Several years of sea surface temperature data (1997–2003) for the coast of Antofagasta Bay—a semi-enclosed bay in
northern Chile—were analyzed in order to further exploring the nature of a warm-water retention pattern inside the bay. Based
on time series techniques, we were able to confirm the persistence of warm water in the bay. This warm featu...
Off central Chile, around 33.5°S, the freshwater discharge of the River Maipo generates a small- to intermediate-size plume, which moves up to the north driven by the daily sea breeze and with localized effects on a costal zone of about 103 stations inside the river plume, one station on the visible turbidity front, and two stations outside the plu...
Time series and shipboard observations of hydrography and current velocity were used to describe the motion of the Maipo River plume, in central Chile, and its influence on inner shelf hydrographic conditions. Observations showed fundamental seasonal changes in the forcing of the plume as recorded by hourly coastal salinities at a location 12 km up...
We studied the occurrence of large high frequency temperature fluctuations and their potential association with settlement of intertidal invertebrates during the spring/summer period 1999/2000 at Las Cruces, on the coast of central Chile. Our results showed the existence of internal tidal bores, characterized by sharp drops in water temperature at...
Projects
Project (1)
MI-BASE aims to (1) understand how past climate changes drove the evolution and shaped ASA biogeography, (2) forecast the fate of ASA biodiversity by evaluating shifts in native species distributions and extinction risks, as well the establishment of exotic species, (3) improve the knowledge on ASA biodiversity and implement long-term biodiversity observatories across marine, terrestrial and freshwater ecosystems, and (4) integrate advanced knowledge of ASA biodiversity, contributing with science for decision making in conservation practices, diagnostics of ATS difficulties, and ideas for a new Antarctic governance.
