13 Works

Phylogenomic analysis of chitinase

Giovanna Capovilla, Rogier Braakman, Gregory Fournier, Thomas Hackl, Julia A. Schwartzman, Xinda Lu, Alexis Yelton, Krista Longnecker, Melissa K. Soule, Elaina Thomas, Gretchen Swarr, Alessandro Mongera, Jack Payette, Jacob Waldbauer, Elizabeth B. Kujawinski, Otto X. Cordero & Sallie W. Chisholm
Supplemental Information: Phylogenomic analysis of chitinase Picocyanobacterial sequences for genes involved in chitin degradation and peptidoglycan recycling pathways were found nested within branches of cyanobacterial genes, indicating vertical inheritance of peptidoglycan recycling. Picocyanobacterial sequences for chitinase (ChiA and ChiA-like) and N-acetylglucosamine kinase (NagK) were nested within non-cyanobacterial taxa, indicating Horizontal Gene Transfer (HGT) to picocyanobacteria after their divergence from other cyanobacteria. To contextualize the HGT of chitinase genes into ancestors of marine SynPro, we examined...

Numerical model simulating the sea ice and ocean conditions in the Amundsen Sea over the period Jan. 1, 2006 to Dec. 31, 2013

Pierre St-Laurent, Eileen E. Hofmann, Robert M. Sherrell, Sharon E. Stammerjohn, Patricia L. Yager, Mathew Biddle & Amber D. York
Numerous coastal polynyas fringe the Antarctic continent and strongly influence the productivity of Antarctic shelf systems. Of the 46 Antarctic coastal polynyas documented in a recent study, the Amundsen Sea Polynya (ASP) stands out as having the highest net primary production per unit area. Incubation experiments suggest that this productivity is partly controlled by the availability of dissolved iron (dFe). As a first step toward understanding the iron supply of the ASP, we introduce four...

Temporal trends and effects of noise on upsweep calls of Eastern South Pacific southern right whales

Ellen Jacobs, Rafaela Landea & Laela Sayigh
Eastern South Pacific southern right whales (ESPSRW) are a subpopulation of southern right whales (Eubalaena australis) off the coasts of Peru and Chile recognized by the International Union for the Conservation of Nature (IUCN) as critically endangered as a result of heavy whaling efforts in the late 18th to 20th centuries. Most recent population estimates put their numbers around 50 individuals. To test for the efficacy of passive acoustic monitoring of this population, we recorded...

Exposure to 3, 3’, 4, 4’, 5-pentachlorobiphenyl (PCB 126) causes widespread DNA hypomethylation in adult zebrafish testis

Neelakanteswar Aluru & Jan Engelhardt
Exposure to environmental toxicants during preconception have been shown to affect offspring health and epigenetic mechanisms such as DNA methylation are hypothesized to be involved in adverse outcomes. However, studies addressing the effects of exposure to environmental toxicants during preconception on epigenetic changes in gametes are limited. The objective of this study is to determine the effect of preconceptional exposure to a dioxin-like PCB (PCB126) on DNA methylation and gene expression in testis. Adult zebrafish...

Pieces in a global puzzle: Population genetics at two whale shark aggregations in the western Indian Ocean

Royale Hardenstine, Song He, Jesse Cochran, Camrin Braun, E. Fernando Cagua, Simon Pierce, Clare Prebble, Christoph Rohner, Pablo Saenz-Agudelo, Tane Sinclair-Taylor, Gregory Skomal, Simon Thorrold, Alexandra Watts, Casey Zakroff & Michael Berumen
The whale shark Rhincodon typus is found throughout the world’s tropical and warm-temperate ocean basins. Despite their broad physical distribution, research on the species has been concentrated at a few aggregation sites. Comparing DNA sequences from sharks at different sites can provide a demographically neutral understanding of the whale shark’s global ecology. Here, we created genetic profiles for 84 whale sharks from the Saudi Arabian Red Sea and 72 individuals from the coast of Tanzania...

Improved biodiversity detection using a large-volume environmental DNA sampler with in situ filtration and implications for marine eDNA sampling strategies

Annette Govindarajan, Luke McCartin, Allan Adams, Elizabeth Allan, Abhimanyu Belani, Rene Francolini, Justin Fujii, Daniel Gomez-Ibanez, Amy Kukulya, Frederick Marin, Kaitlyn Tradd, Dana Yoerger, Jill McDermott & Santiago Herrera
Metabarcoding analysis of environmental DNA samples is a promising new tool for marine biodiversity and conservation. Typically, seawater samples are obtained using Niskin bottles and filtered to collect eDNA. However, standard sample volumes are small relative to the scale of the environment, conventional collection strategies are limited, and the filtration process is time consuming. To overcome these limitations, we developed a new large – volume eDNA sampler with in situ filtration, capable of taking up...

Roles of gas and heat in a mushy magma chamber

Yang Liao
The processes that occur in magmatic reservoirs and their surrounding crustal rocks can modulate the triggering, duration, and style of volcanic eruptions. Although magmatic reservoirs are typically modeled as cavities filled with fluid magma, geophysical and petrological observations have long suggested that they likely contain crystal mush, an ensemble of solid crystals and fluid (gas/melt) that reside in interstitial pore spaces. The mushy-and-gassy magma chamber extends previous studies by Liao et al (2018, 2021) to...

Southern Cape Cod Bay hypoxia data

Malcolm E. Scully, Tracy L. Pugh, W. Rockwell Geyer, Amy Costa & Owen C. Nichols
This project investigated the distribution of low dissolved oxygen bottom waters (hypoxia) in southern Cape Cod Bay. Hypoxia was documented for the first time in late summer 2019 and 2020 despite extensive monitoring for the past decade. The data include: 1) measurements of bottom dissolved oxygen collected in 2019 by the Massachusetts Division of Marine Fisheries (MDMF) and the Center for Coastal Studies (CCS) ; 2) full water column profiles of temperature, salinity, chlorophyll fluorescence,...

Seasonal trends and diel patterns of downsweep and SEP calls in Chilean blue whales (Balaenoptera musculus)

Laura Redaelli, Sari Mangia Woods, Rafaela Landea Briones & Laela S. Sayigh
To learn more about occurrence and behavior of a recently discovered population of blue whales, passive acoustic data were collected for 15 consecutive months (January 2012 – April 2013) in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SEP calls) and D calls, which were then analyzed to gain insights into temporal calling patterns. We found a year-round acoustic presence of D calls, with the...

Age-by-maternal-age Markov chain with rewards analysis of variance in LRO in rotifers

Silke Van Daalen
This set of data and code files is a supplement to the American Naturalist paper: van Daalen et al. 2021 The contributions of maternal age heterogeneity to variance in lifetime reproductive output It provides the user the matrices (as first presented in Hernandez et al., 2020, PNAS) and the code to reproduce our analysis or apply the methods to their own data. Two multistate, age-by-maternal-age matrices with basic demographic information (survival and transitions, and fertility)...

Tidal dispersion in short estuaries

Adrian Mikhail P. Garcia & W. Rockwell Geyer
The salinity distribution of an estuary depends on the balance between the river outflow, which is seaward, and a dispersive salt flux, which is landward. The dispersive salt flux at a fixed cross-section can be divided into shear dispersion, which is caused by spatial correlations of the cross-sectionally varying velocity and salinity, and the tidal oscillatory salt flux, which results from the tidal correlation between the cross-section averaged, tidally varying components of velocity and salinity....

Registration Year

  • 2022
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Affiliations

  • Woods Hole Oceanographic Institution
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  • Massachusetts Institute of Technology
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  • Marine Megafauna Foundation
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  • University of Georgia
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  • Lehigh University
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  • University of Groningen
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  • King Abdullah University of Science and Technology
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  • University of Chicago
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  • Austral University of Chile
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  • University of Colorado Boulder
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