Alexandra Z. Worden
University of California, Santa Cruz
13Publications
8H-index
732Citations
Publications 13
Newest
Published on Jul 1, 2018in Nature microbiology 14.17
Jian Guo3
Estimated H-index: 3
(Monterey Bay Aquarium Research Institute),
Susanne Wilken11
Estimated H-index: 11
(University of Amsterdam)
+ 17 AuthorsEmily Nahas Reistetter3
Estimated H-index: 3
(Monterey Bay Aquarium Research Institute)
Marine algae perform approximately half of global carbon fixation, but their growth is often limited by the availability of phosphate or other nutrients1,2. As oceans warm, the area of phosphate-limited surface waters is predicted to increase, resulting in ocean desertification3,4. Understanding the responses of key eukaryotic phytoplankton to nutrient limitation is therefore critical5,6. We used advanced photo-bioreactors to investigate how the widespread marine green alga Micromonas commoda gr...
1 Citations Source Cite
Published on Mar 15, 2016in Applied and Environmental Microbiology 3.63
Melinda P. Simmons2
Estimated H-index: 2
(University of California, Santa Cruz),
Sebastian Sudek14
Estimated H-index: 14
+ 6 AuthorsAlexandra Z. Worden8
Estimated H-index: 8
(University of California, Santa Cruz)
ABSTRACT Eukaryotic algae within the picoplankton size class (≤2 μm in diameter) are important marine primary producers, but their spatial and ecological distributions are not well characterized. Here, we studied three picoeukaryotic prasinophyte genera and their cyanobacterial counterparts, Prochlorococcus and Synechococcus, during two cruises along a North Pacific transect characterized by different ecological regimes. Picoeukaryotes and Synechococcus reached maximum abundances of 1.44 × 10 5 ...
19 Citations Source Cite
Published on Jul 19, 2016in PLOS ONE 2.77
Peter Waltman4
Estimated H-index: 4
(University of California, Santa Cruz),
Jian Guo3
Estimated H-index: 3
(Monterey Bay Aquarium Research Institute)
+ 9 AuthorsStephen J. Callister19
Estimated H-index: 19
(Pacific Northwest National Laboratory)
Micromonas is a unicellular motile alga within the Prasinophyceae, a green algal group that is related to land plants. This picoeukaryote (<2 μm diameter) is widespread in the marine environment but is not well understood at the cellular level. Here, we examine shifts in mRNA and protein expression over the course of the day-night cycle using triplicated mid-exponential, nutrient replete cultures of Micromonas pusilla CCMP1545. Samples were collected at key transition points during the diel cycl...
4 Citations Source Cite
Published on Sep 1, 2015in Molecular Biology and Evolution 10.22
Melinda P. Simmons2
Estimated H-index: 2
(University of California, Santa Cruz),
Charles Bachy11
Estimated H-index: 11
(Monterey Bay Aquarium Research Institute)
+ 4 AuthorsAlexandra Z. Worden8
Estimated H-index: 8
(Canadian Institute for Advanced Research)
Spliceosomal introns are a hallmark of eukaryotic genes that are hypothesized to play important roles in genome evolution but have poorly understood origins. Although most introns lack sequence homology to each other, new families of spliceosomal introns that are repeated hundreds of times in individual genomes have recently been discovered in a few organisms. The prevalence and conservation of these introner elements (IEs) or introner-like elements in other taxa, as well as their evolutionary r...
20 Citations Source Cite
Published on Feb 13, 2015in Science 41.06
Alexandra Z. Worden8
Estimated H-index: 8
(Canadian Institute for Advanced Research),
Michael J. Follows51
Estimated H-index: 51
(Massachusetts Institute of Technology)
+ 3 AuthorsPatrick J. Keeling69
Estimated H-index: 69
(Canadian Institute for Advanced Research)
Protists are single-celled organisms complete with nuclei, organelles, and symbionts, and possess a multiplicity of physiological talents. They are ubiquitous, abundant, and often neglected by science. Worden et al. review the challenges of understanding the role protists play in geochemical cycling in the oceans. These organisms can photosynthesize like plants, graze on bacteria and archaea, parasitize each other and bigger creatures, have sex, and sometimes do all these things serially as cond...
156 Citations Source Cite
Francois Ribalet13
Estimated H-index: 13
(University of Washington),
Jarred Swalwell7
Estimated H-index: 7
(University of Washington)
+ 6 AuthorsE. Virginia Armbrust40
Estimated H-index: 40
(University of Washington)
Abstract Theoretical studies predict that competition for limited resources reduces biodiversity to the point of ecological instability, whereas strong predator/prey interactions enhance the number of coexisting species and limit fluctuations in abundances. In open ocean ecosystems, competition for low availability of essential nutrients results in relatively few abundant microbial species. The remarkable stability in overall cell abundance of the dominant photosynthetic cyanobacterium Prochloro...
29 Citations Source Cite
Deqiang Duanmu8
Estimated H-index: 8
(University of California, Davis),
Charles Bachy11
Estimated H-index: 11
+ 12 AuthorsMarijke J. van Baren8
Estimated H-index: 8
Abstract Phytochrome photosensors control a vast gene network in streptophyte plants, acting as master regulators of diverse growth and developmental processes throughout the life cycle. In contrast with their absence in known chlorophyte algal genomes and most sequenced prasinophyte algal genomes, a phytochrome is found in Micromonas pusilla, a widely distributed marine picoprasinophyte (<2 µm cell diameter). Together with phytochromes identified from other prasinophyte lineages, we establish t...
56 Citations Source Cite
Nathan C. Rockwell24
Estimated H-index: 24
(University of California, Davis),
Deqiang Duanmu8
Estimated H-index: 8
(University of California, Davis)
+ 5 AuthorsJ. Clark Lagarias40
Estimated H-index: 40
(University of California, Davis)
Photosynthetic organisms exploit photosensory proteins to respond to changing light conditions. In land plants, phytochromes use the ratio of red to far-red light to detect shading by neighboring plants, leading to changes in growth and development. Light conditions can be more variable for algae because of the wavelength-dependent attenuation of light by water and because of ocean mixing. We studied phytochromes from taxonomically diverse eukaryotic algae from groups considered important for co...
81 Citations Source Cite
Published on Jun 24, 2014in PLOS Biology 9.16
Patrick J. Keeling69
Estimated H-index: 69
(University of British Columbia),
Fabien Burki25
Estimated H-index: 25
(University of British Columbia)
+ 78 AuthorsCallum J. Bell11
Estimated H-index: 11
(National Center for Genome Resources)
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, and ecology; this Community Page describes a resource of 700 transcriptomes from marine microbial eukaryotes to help understand their role in the world's oceans.
321 Citations Source Cite
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