Andreas F Haas

Andreas F Haas
NIOZ Royal Netherlands Institute for Sea Research | NIOZ · Department of Marine Microbiology and Biogeochemistry (MMB)

PhD

About

127
Publications
26,668
Reads
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3,108
Citations
Citations since 2016
80 Research Items
2485 Citations
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20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
October 2017 - present
NIOZ Royal Netherlands Institute for Sea Research
Position
  • Researcher
November 2014 - present
San Diego State University
Position
  • Research Assistant
April 2012 - October 2014
San Diego State University
Position
  • PostDoc Position
Education
July 2007 - July 2010
Ludwig-Maximilians-University of Munich
Field of study
  • Biogeochemistry

Publications

Publications (127)
Article
To thrive in nutrient-poor waters, coral reefs must retain and recycle materials efficiently. This review centers microbial processes in facilitating the persistence and stability of coral reefs, specifically the role of these processes in transforming and recycling the dissolved organic matter (DOM) that acts as an invisible central currency in re...
Article
Full-text available
Significance Marine dissolved organic matter (DOM) is one of the most complex and abundant chemical mixtures on earth, comprising thousands of different molecules. The molecular structure of these compounds is one factor structuring the community of microorganisms that metabolize them; in turn, this microbial metabolism mediates the composition of...
Article
Full-text available
Submarine sinkholes are found on carbonate platforms around the world. They are thought to form and grow when groundwater interactions generate conditions corrosive to carbonate minerals. Because their morphology can restrict mixing and water exchange, the effects of biogeochemical processes can accumulate such that the sinkhole water properties co...
Article
Full-text available
The marine green alga Brilliantia kiribatiensis gen. et sp. nov. is described from samples collected during two expeditions (2009, 2013) from the coral reefs of the Southern Line Islands, Republic of Kiribati, Pacific Ocean. Phylogenetic analysis of sequences of the large‐ and small‐subunit rDNA and the rDNA internal transcribed spacer region revea...
Article
Full-text available
The rapidly advancing field of metabolomics encompasses a diverse suite of powerful analytical and bioinformatic tools that can help to reveal the diversity and activity of chemical compounds in individual organisms, species interactions, and entire ecosystems. In this perspective we use examples from studies of coral reefs to illustrate ways in wh...
Article
Full-text available
Lipids, as one of the main building blocks of cells, can provide valuable information on microorganisms in the environment. Traditionally, gas or liquid chromatography coupled to mass spectrometry (MS) has been used to analyze environmental lipids. The resulting spectra were then processed through individual peak identification and comparison with...
Article
Full-text available
Reef-building corals are ecosystem engineers that compete with other benthic organisms for space and resources. Corals harvest energy through their surface by photosynthesis and heterotrophic feeding, and they divert part of this energy to defend their outer colony perimeter against competitors. Here, we hypothesized that corals with a larger space...
Article
Full-text available
All organisms host a diversity of associated viruses, bacteria, and protists, collectively defined as the holobiont. While scientific advancements have enhanced the understanding of the functional roles played by various components of the holobiont, there is a growing need to integrate multiple types of molecular data into spatially and temporally...
Article
Full-text available
Viruses, microbes, and host macroorganisms form ecological units called holobionts. Here, a combination of metagenomic sequencing, metabolomic profiling, and epifluorescence microscopy was used to investigate how the different components of the holobiont including bacteria, viruses, and their associated metabolites mediate ecological interactions b...
Preprint
Full-text available
Primary producers release oxygen as the by-product of photosynthetic light reactions during the day. However, a prevalent, globally-occurring nighttime spike in dissolved oxygen in the absence of light challenges the traditional assumption that biological oxygen production is limited to daylight hours, particularly in tropical coral reefs. Here we...
Article
Full-text available
The microbialization of coral reefs predicts that microbial oxygen consumption will cause reef deoxygenation. Here we tested this hypothesis by analyzing reef microbial and primary producer oxygen metabolisms. Metagenomic data and in vitro incubations of bacteria with primary producer exudates showed that fleshy algae stimulate incomplete carbon ox...
Article
Full-text available
On coral reefs, microorganisms are essential for recycling nutrients to primary producers through the remineralization of benthic-derived organic matter. Diel investigations of reef processes are required to holistically understand the functional roles of microbial players in these ecosystems. Here we report a metagenomic analysis characterizing mi...
Preprint
Full-text available
Coral reefs are declining globally as their primary producer communities shift from stony coral to fleshy macroalgae dominance. Previously, we have shown that the rise of fleshy macroalgae produces dissolved organic carbon (DOC) that lead to microbialization and coral death. Here we test the hypothesis that the biophysical cause of bacterial biomas...
Article
Full-text available
We have observed that marine macroalgae produce sound during photosynthesis. The resultant soundscapes correlate with benthic macroalgal cover across shallow Hawaiian coral reefs during the day, despite the presence of other biological noise. Likely ubiquitous but previously overlooked, this source of ambient biological noise in the coastal ocean i...
Data
Chemical and acoustic responses of algae to changes in photosynthetically available radiation (PAR). All subfigures are time-aligned. (A) Dissolved oxygen time series. (B) Acoustically determined bubble counts per minute. (C) Acoustically determined mean bubble radius per minute. (TIFF)
Data
Log-linear regression plots of acoustic emissions from photosynthesizing algae. (A) No. of bubbles per minute against dissolved oxygen levels (R2 = 0.76, exponential coefficients α = -2.54, β = 0.43). (B) Mean bubble radii per minute against dissolved oxygen levels (R2 = 0.47, exponential coefficients α = -3.85, β = 0.19). (C) 10-minute Sound Expos...
Article
Full-text available
An overall synthesis of biology and non-equilibrium thermodynamics remains a challenge at the interface between the physical and life sciences. Herein, theorems from finite-time and control thermodynamics are applied to biological processes to indicate which biological strategies will succeed over different time scales. In general, living systems m...
Preprint
Full-text available
Corals have built reefs on the benthos for millennia, becoming an essential element in marine ecosystems. Climate change and human impact, however, are favoring the invasion of non-calcifying benthic algae and reducing coral coverage. Corals rely on energy derived from photosynthesis and heterotrophic feeding, which depends on their surface area, t...
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Full-text available
Over the past 2 decades, molecular techniques have established the critical role of both free-living and host-associated microbial partnerships in the environment. Advancing research to link microbial community dynamics simultaneously to host physiology and ecosystem biogeochemistry is required to broaden our understanding of the ecological roles o...
Article
Full-text available
Coastal underwater soundscapes typically contain signals from soniferous, biological processes. Identifying the sources that contribute to oftentimes acoustically complex soundscapes would facilitate a noninvasive, remote, and volumetrically integrative method to survey underwater ecological state, as has been demonstrated on land. To date the lack...
Article
Full-text available
Dissolved organic matter (DOM) is arguably one of the most complex exometabolomes on earth, and is comprised of thousands of compounds, that together contribute more than 600×1015 g carbon. This reservoir is primarily the product of interactions between the upper ocean’s microbial food web, yet abiotic processes that occur over millennia have also...
Article
Full-text available
Human impacts are causing ecosystem phase shifts from coral- to algal-dominated reef systems on a global scale. As these ecosystems undergo transition, there is an increased incidence of coral-macroalgal interactions. Mounting evidence indicates that the outcome of these interaction events is, in part, governed by microbially mediated dynamics. The...
Data
Statistical output of one-way ANOVA and subsequent Student t-test post hoc analysis for power output (µW) normalized by weight of the sample (g)
Data
Conceptual depiction of power versus yield Power -the measure of energy flow per unit time (Joules/ second)—is maximized at 50% yield—the dimensionless measure of energetic output per unit energy input (Joules/ Joules), also referred to as efficiency. Figure adapted and modified from Odum & Pinkerton (1955).
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the first experimental replicate.
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the third experimental replicate.
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the eighth experimental replicate.
Data
Oxygen optode raw data Oxygen optode raw data from the second replicate.
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Oxygen optode raw data Oxygen optode raw data from the third replicate.
Data
Flow cytometry raw data Raw data of unstained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Data
Flow cytometry raw data Raw data of stained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Data
Statistical output of one-way ANOVA and subsequent Student t-test post hoc analysi s for heterotroph: autotroph ratios
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the seventh experimental replicate.
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the fourth experimental replicate.
Data
Oxygen optode raw data Oxygen optode raw data from the fourth replicate.
Data
Flow cytometry raw data Raw data of unstained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Data
Statistical output of one-way ANOVA and subsequent Student t-test post hoc analysis for dissolved oxygen concentration (µM)
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the second experimental replicate.
Data
Flow cytometry raw data Raw data of stained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Data
Statistical output of one-way ANOVA and subsequent Student t-test post hoc analysis for total cellular abundance (cells/ mL)
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the sixth experimental replicate.
Data
Calorimetry raw data Raw data exported from the TAM III calorimeter for the fifth experimental replicate.
Data
Oxygen optode raw data Oxygen optode raw data from the 1 replicate.
Data
Flow cytometry raw data Raw data of unstained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Data
Flow cytometry raw data Raw data of stained samples exported from the flow cytometer BD FACS-Canto and analyzed in Figs. 3 and 4.
Preprint
Full-text available
Primary production due to photosynthesis results in daytime oxygen production across marine and freshwater ecosystems. However, a prevalent, globally-occurring nighttime spike in dissolved oxygen (DO) challenges our traditional assumption that oxygen production is limited to daylight hours, particularly in tropical coral reefs. When considered in t...
Preprint
Full-text available
Primary production due to photosynthesis results in daytime oxygen production across marine and freshwater ecosystems. However, a prevalent, globally-occurring nighttime spike in dissolved oxygen (DO) challenges our traditional assumption that oxygen production is limited to daylight hours, particularly in tropical coral reefs. When considered in t...
Article
Full-text available
Temperate bacterial viruses (phages) may enter a symbiosis with their host cell, forming a unit called a lysogen. Infection and viral replication are disassociated in lysogens until an induction event such as DNA damage occurs, triggering viral-mediated lysis. The lysogen–lytic viral reproduction switch is central to viral ecology, with diverse eco...
Preprint
Full-text available
Primary production due to photosynthesis results in daytime oxygen production across marine and freshwater ecosystems. However, a prevalent, globally-occurring nighttime spike in dissolved oxygen (DO) challenges our traditional assumption that oxygen production is limited to daylight hours, particularly in tropical coral reefs. When considered in t...
Article
Full-text available
Immunity is mostly studied in a few model organisms, leaving the majority of immune systems on the planet unexplored. To characterize the immune systems of non-model organisms alternative approaches are required. Viruses manipulate host cell biology through the expression of proteins that modulate the immune response. We hypothesized that metagenom...