A5041805283- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Polar Research and Ecology
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Ocean Acidification Effects and Responses
- Microbial Community Ecology and Physiology
- Oceanographic and Atmospheric Processes
- Coastal and Marine Management
- Environmental and Cultural Studies in Latin America and Beyond
- Cephalopods and Marine Biology
- Lichen and fungal ecology
- Diatoms and Algae Research
- Marine animal studies overview
- Biocrusts and Microbial Ecology
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Species Distribution and Climate Change
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Indigenous Studies and Ecology
- Plant and animal studies
- Genomics and Phylogenetic Studies
- Fish Ecology and Management Studies
Argentine Antarctic Institute
2016-2025
Bernardino Rivadavia Natural Sciences Museum
2005-2023
University of Cambridge
2017
National University of Patagonia San Juan Bosco
1996
Climate warming has been related to glacial retreat along the Western Antarctic Peninsula. Over last years, a visible melting of Fourcade Glacier (Potter Cove, South Shetland Islands) exposed newly ice-free hard bottom areas available for benthic colonization. However, ice produces reduction light penetration due an increase sediment input and higher impact. Seventeen years ago, coastal sites close glacier cliffs were devoid macroalgae. Are suitable macroalgal colonization? To tackle this...
Abstract Polar algae have a striking ability to photosynthesize and grow under very low light temperatures. In seaweeds, minimum demands for photosynthetic saturation compensation can be as 10 2 μmol photons m -2 s -1 , respectively. For benthic microalgae, these values even lower because of the limited irradiance reaching deep sea floors. The extreme shade adaptation organisms sets their distributional limits at depths close 40 enables them tolerate long periods extended darkness. addition...
Abstract This paper reviews the composition, biogeography and zonation of benthic algae in Arctic Antarctic polar regions. There is a marked contrast literature between amount information on microalgae vs. macroalgae. Perhaps not surprising view their size conspicuous nature, macroalgae are better known than they have been studied more intensively. Macroalgal biodiversity greater Antarctica Arctic, as number endemic species. Both these characteristics marine macroalgal flora can be explained...
Sea ice, including icebergs, has a complex relationship with the carbon held within animals (blue carbon) in polar regions. Sea-ice losses around West Antarctica's continental shelf generate longer phytoplankton blooms but also make it hotspot for coastal iceberg disturbance. This matters because regions ice scour limits blue storage ecosystem services, which work as powerful negative feedback on climate change (less sea increases blooms, benthic growth, seabed and sequestration). resets...
Glaciers along the western Antarctic Peninsula are retreating at unprecedented rates, opening up sublittoral rocky substrate for colonization by marine organisms such as macroalgae. When macroalgae physically detached due to storms or erosion, their fragments can accumulate in seabed hollows, where they be grazed upon herbivores degraded microbially sequestered. To understand fate of increasing amount macroalgal detritus shallow subtidal sediments, a mesocosm experiment was conducted track...
The microbiome of macroalgae facilitates their adaptation to environmental stress. As bacteria release algal growth and morphogenesis promoting factors (AGMPFs), which are necessary for the healthy development macroalgae, play a crucial role in stress bacterial-algal interactions. To better understand level macroalgal dependence on under various such as light, temperature, salt, or micropollutants, we propose reductionist analysis tripartite model system consisting axenic green alga Ulva...
The West Antarctic Peninsula (WAP) is a hotspot of physical climate change, especially glacial retreat, particularly in its northern South Shetland Islands (SSI) region. Along coastlines, this process opening up new ice-free areas, for colonization by high biodiversity flora and fauna. At Potter Cove, the SSI (Isla 25 de Mayo/King George Island), Antarctica, macroalgae was studied two newly low glacier influence area (LGI), (HGI) differing presence sediment run-off light penetration, which...
In Potter Cove, King George Island, Antarctica, macroalgae provide a significant food resource for herbivores. The demersal fish Notothenia coriiceps feeds on macroalgae. Eighteen algal species were identified in stomach contents: two chlorophytes, ten rhodophytes and six phaeophytes. Among these the rhodophyte Palmaria decipiens , phaeophyte Desmarestia menziesii chlorophyte Monostroma hariotii comprised greatest proportions of biomass. A selection study showed four algae to be preferred (...
Abstract We describe the macroalgal assemblages in Potter Cove and their distribution by depth, substratum, irradiation, nutrients, salinity, water temperature light period. determined groups using K-means, Hellinger index maximum Calinski-Harabasz pseudo-F-statistic as stopping rule. Indicator species were assessed with IndVal index. Relationships between environmental factors correspondence analysis, results validated a canonical analysis of environment. To compare group biodiversities we...
Macroalgae are the main primary producers in polar coastal regions and of major importance for associated heterotrophic communities. On King George Island/Isla 25 de Mayo, West Antarctic Peninsula (WAP) several fjords undergo rapid glacial retreat response to increasing atmospheric temperatures. Hence, extended meltwater plumes laden with suspended particulate matter (SPM) generated that hamper production during austral summer season. We used ensemble modelling approximate changes benthic...
Abstract Information on succession in marine benthic primary producers polar regions is very scarce, particularly with regard to effects of abiotic and biotic drivers community structure. Primary begins rapid colonizers, such as diatoms ephemeral macroalgae, whereas slow, highly seasonal recruitment growth are characteristic annual or perennial seaweed species. Colonization intertidal subtidal assemblages rocky shores severely affected by physical disturbance changes conditions. Biotic...
Most coastal glaciers on the West Antarctic Peninsula are in retreat. Glacial ice scouring and lithogenic particle runoff increase turbidity shape soft sediment benthic communities. This, turn, has potential to induce a shift these systems from an autotrophic heterotrophic state. In this study, we investigated influence of glacial carbon flows soft-sediment food web Potter Cove, well-studied shallow fjord located northern region Peninsula. We constructed linear inverse models using dataset...
The sensitivity of different life stages the eulittoral green alga Urospora penicilliformis (Roth) Aresch. to ultraviolet radiation (UVR) was examined in laboratory. Gametophytic filaments and propagules (zoospores gametes) released from were separately exposed fluence treatments consisting PAR ( P = 400–700 nm), + A (UVA) (PA, UVA 320–400 B (UVB) (PAB, UVB 280–320 nm). Photophysiological indices (ETR max , E k α) derived rapid light curves measured controls, while photosynthetic efficiency...
ABSTRACT The western Antarctic Peninsula (WAP) is a hotspot of rapid recent regional ‘climate change’. This has resulted in 0.4°C rise sea temperature the last 50 years, five days ice lost per decade and increased scouring shallows. WAP shallows are ideal for studying biological response to physical change because most known species benthic, occurs mainly research stations coastal. Studies at Rothera Station have found benthic disturbance with losses winter assemblage-level changes...
Abstract Macroalgae are found in a variety of marine vegetation ecosystems around the world, contributing significantly to global net primary production. In particular, sea lettuce species, i.e., members genus Ulva (Chlorophyta), located many ecological niches and characterized by excellent adaptability environmental changes but depend on essential associated bacteria, which release algal growth morphogenesis-promoting-factors (AGMPFs). Our work investigated hypothesis that bacteria need be...