A5067654520- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Microbial Community Ecology and Physiology
- Arctic and Antarctic ice dynamics
- Microbial Natural Products and Biosynthesis
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Protist diversity and phylogeny
- Marine Sponges and Natural Products
- Synthetic Organic Chemistry Methods
- Atmospheric chemistry and aerosols
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Polar Research and Ecology
- Cardiovascular and Diving-Related Complications
- Environmental DNA in Biodiversity Studies
- Geology and Paleoclimatology Research
National Institute of Water and Atmospheric Research
2021-2025
University of Otago
2022-2024
Universidad Mayor
2020-2022
Abstract Relatively little is known about the role of sponge microbiomes in Antarctic marine environment, where sponges may dominate benthic landscape. Specifically, we understand how taxonomic and functional diversity contributes to symbiotic lifestyle aids nutrient cycling. Here use metagenomics investigate community composition metabolic potential from two abundant sponges, Leucetta antarctica Myxilla sp. Genomic analyses show that both harbor a distinct microbial with high fungal...
The marine system plays a critical role in the global climate cycle, as major control of atmospheric carbon dioxide (CO2). Marine primary production (photosynthesis) and remineralisation organic (respiration, degradation) determine amount CO2 sequestered sediments deep-water environments on century to millennial timescales. stocks fluxes cycle are susceptible change impacts other anthropogenic activities that modify key processes. Oceanographic studies Aotearoa New Zealand's Exclusive...
Abstract Year-round reports of phytoplankton dynamics in the West Antarctic Peninsula are rare and mainly limited to microscopy and/or pigment-based studies. We analyzed community from coastal waters Fildes Bay between January 2014 2015 using metabarcoding nuclear plastidial 18/16S rRNA gene both size-fractionated flow cytometry sorted samples. Overall 14 classes photosynthetic eukaryotes were present our samples with following dominating: Bacillariophyta (diatoms), Pelagophyceae...
Areas covered in compact sea ice were often assumed to prohibit upper-ocean photosynthesis. Yet, under-ice phytoplankton blooms (UIBs) have increasingly been observed the Arctic, driven by anthropogenic changes optical properties of Arctic ice. Here, we show evidence that Southern Ocean may also support widespread UIBs. We compile 77 time series water column samples from biogeochemical Argo floats profiled under (80%–100% concentration) austral spring–summer since 2014. find nearly all (88%)...
Abstract The goal of the Sea2Cloud project is to study interplay between surface ocean biogeochemical and physical properties, fluxes atmosphere, ultimately their impact on cloud formation under minimal direct anthropogenic influence. Here we present an interdisciplinary approach, combining atmospheric physics chemistry with marine biogeochemistry, during a voyage 41° 47°S in March 2020. In parallel ambient measurements composition seawater describe semicontrolled experiments characterize...
Sponge-associated microorganisms are essential for sponge survival. They play an important role in recycling nutrients and, therefore, the maintenance of ecosystem. These diverse, species-specific, and different from those surrounding seawater. Bacterial symbionts have been extensively studied tropics; however, little is known about these sponges high-latitude environments. Sponges can cover up to 80% benthos Antarctica crucial architects marine food web. In this study, we present analyses...
Abstract. Future change in sea surface temperature may influence climate via various air–sea feedbacks and pathways. In this study, we investigate the of seawater biogeochemical composition on dependence number-based spray emission fluxes. The fluxes was investigated different water masses (i.e., subantarctic, subtropical frontal bloom) with contrasting properties across a range from ambient (13–18 ∘C) to 2 ∘C using circulating plunging jet generator. We observed significant increase total...
Abstract The Ross Sea is a highly productive system characterized by seasonal succession of phytoplankton groups. However, most the current understanding based on observations continental shelf in spring and summer at relatively coarse taxonomic resolution. Here, we characterize community composition (class to species) using V4‐18S rRNA gene metabarcoding transects across (shelf‐slope oceanic subregions) during two voyages covering Austral summer–autumn progression successive years....
The metabolism of phytoplankton cells is synchronized with the diel light cycle. Likewise, associated heterotrophic bacteria adjust their expression transporter- and catabolism-related genes to target dissolved organic matter released by cell. Dissolved combined carbohydrates (DCCHO) amino acids (DAA) are major products bacterial substrates. Here, we show that variations DCCHO DAA concentrations accounted for a significant turnover total carbon (TOC) pool (up 5.0%, at rate 0.37 μM C h–1)...
Abstract. Future change in sea surface temperature may influence climate via various air-sea feedbacks and pathways. In this study, we investigate the of seawater biogeochemical composition on dependence spray number emission fluxes. Dependence fluxes was investigated different water masses (i.e. subantarctic, subtropical frontal bloom) with contrasting properties across a range from ambient (13–18 °C) to 2 °C, using circulating plunging jet generator. We observed total concentration...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Nature Communications. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing an older version [v2]Go new versionPhytoplankton Blooms Under Antarctic Sea IceAuthorsChristopherHorvatiDKelsey MBissoniDSarahSeabrookAntoniaCristiiDLisaMatthesiDSee all authors Christopher HorvatiDCorresponding...
Abstract Year-round reports of phytoplankton dynamics in the West Antarctic Peninsula are rare and mainly limited to microscopy and/or pigment-based studies. We analyzed community from coastal waters Fildes Bay between January 2014 2015 using metabarcoding nuclear plastidial 18/16S rRNA gene both size-fractionated flow cytometry sorted samples. Each approach yielded a different image with for example Prymnesiophyceae more prevalent metabarcodes Mamiellophyceae ones. Overall 14 classes...
Areas covered in compact sea ice are often assumed to prohibit upper ocean photosynthesis. Yet under-ice phytoplankton blooms (UIBs) have increasingly been observed the Arctic, driven by anthropogenic changes optical properties of Arctic ice. Here we show Southern Ocean can also support widespread UIBs. Using under ice-enabled BGC-Argo float data, detail numerous high biomass events below preceding seasonal retreat, and classify 12 distinct UIB events. joint light, ice, conditions obtained...
Areas covered in compact sea ice are often assumed to prohibit upper ocean photosynthesis. Yet under-ice phytoplankton blooms (UIBs) have increasingly been observed the Arctic, driven by anthropogenic changes optical properties of Arctic ice. Here we show Southern Ocean can also support widespread UIBs. Using under ice-enabled BGC-Argo float data, detail numerous high biomass events below preceding seasonal retreat, and classify 12 distinct UIB events. joint light, ice, conditions obtained...