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1. Domoic Acid and Pseudo-nitzschia spp. Connected to Coastal Upwelling along Coastal Inhambane Province, Mozambique: A New Area of Concern

Author

Holly Kelchner, Katie E. Reeve-Arnold, Kathryn M. Schreiner, Sibel Bargu, Kim G. Roques, and Reagan M. Errera

Subjects
phycotoxin, monitoring, biodiversity hotspot, CHEMTAX, Western Boundary System, Trichodesmium, Medicine
Abstract

Harmful algal blooms (HABs) are increasing globally in frequency, persistence, and geographic extent, posing a threat to ecosystem and human health. To date, no occurrences of marine phycotoxins have been recorded in Mozambique, which may be due to absence of a monitoring program and general awareness of potential threats. This study is the first documentation of neurotoxin, domoic acid (DA), produced by the diatom Pseudo-nitzschia along the east coast of Africa. Coastal Inhambane Province is a biodiversity hotspot where year-round Rhincodon typus (whale shark) sightings are among the highest globally and support an emerging ecotourism industry. Links between primary productivity and biodiversity in this area have not previously been considered or reported. During a pilot study, from January 2017 to April 2018, DA was identified year-round, peaking during Austral winter. During an intense study between May and August 2018, our research focused on identifying environmental factors influencing coastal productivity and DA concentration. Phytoplankton assemblage was diatom-dominated, with high abundances of Pseudo-nitzschia spp. Data suggest the system was influenced by nutrient pulses resulting from coastal upwelling. Continued and comprehensive monitoring along southern Mozambique would provide critical information to assess ecosystem and human health threats from marine toxins under challenges posed by global change.

Published
2021
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2. Corrigendum: Diatom Transcriptional and Physiological Responses to Changes in Iron Bioavailability across Ocean Provinces

Author

Natalie R. Cohen, Kelsey A. Ellis, Robert H. Lampe, Heather McNair, Benjamin S. Twining, Maria T. Maldonado, Mark A. Brzezinski, Fedor I. Kuzminov, Kimberlee Thamatrakoln, Claire P. Till, Kenneth W. Bruland, William G. Sunda, Sibel Bargu, and Adrian Marchetti

Subjects
diatoms, Thalassiosira, Pseudo-nitzschia, iron, metatranscriptomics, California upwelling zone, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Published
2018
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3. Diatom Transcriptional and Physiological Responses to Changes in Iron Bioavailability across Ocean Provinces

Author

Natalie R. Cohen, Kelsey A. Ellis, Robert H. Lampe, Heather McNair, Benjamin S. Twining, Maria T. Maldonado, Mark A. Brzezinski, Fedor I. Kuzminov, Kimberlee Thamatrakoln, Claire P. Till, Kenneth W. Bruland, William G. Sunda, Sibel Bargu, and Adrian Marchetti

Subjects
diatoms, Thalassiosira, Pseudo-nitzschia, iron, metatranscriptomics, California Upwelling Zone, Science, General. Including nature conservation, geographical distribution, QH1-199.5
Abstract

Changes in iron (Fe) bioavailability influence diatom physiology and community composition, and thus have a profound impact on primary productivity and ecosystem dynamics. Iron limitation of diatom growth rates has been demonstrated in both oceanic and coastal waters of the Northeast Pacific Ocean and is predicted to become more pervasive in future oceans. However, it is unclear how the strategies utilized by phytoplankton to cope with low Fe bioavailability and resupply differ across these ocean provinces. We investigated the response of diatom communities to variable Fe conditions through incubation experiments performed in the Fe mosaic of the California Upwelling Zone and along a natural Fe gradient in the Northeast Pacific Ocean. Through coupling gene expression of two dominant diatom taxa (Pseudo-nitzschia and Thalassiosira) with biological rate process measurements, we provide an in-depth examination of the physiological and molecular responses associated with varying Fe status. Following Fe enrichment, oceanic diatoms showed distinct differential expression of gene products involved in nitrogen assimilation, photosynthetic carbon fixation, and vitamin production compared to diatoms from low-Fe coastal sites, possibly driven by the chronic nature of Fe stress at the oceanic site. Genes of interest involved in Fe and N metabolism additionally exhibited divergent expression patterns between the two diatom taxa investigated, demonstrating that diverse diatoms may invoke alternative strategies when dealing with identical changes in their environment. We report here several mechanisms used distinctly by coastal or oceanic diatom communities as well as numerous taxa-specific strategies for coping with Fe stress and rearranging nutrient metabolism following Fe enrichment.

Published
2017
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4. AUTOBIOGRAPHICAL SKETCHES OF WOMEN IN OCEANOGRAPHY

Author

Delaney, Peggy, Abrantes, Fatima, Alexander, Vera, Alldredge, Alice L., Almogi-Labin, Ahuva, Alonso, Belén, Anand, Pallavi, Ates, Sibel Bargu, Bauch, Dorothea, Bell, Robin E., Benitez-Nelson, Claudia, Benoit-Bird, Kelly, Bergamaschi, Dorothy Eden, Bernhard, Joan M., Billups, Katharina, Bronk, Deborah A., Campbell, Lisa, Canuel, Elizabeth A., Carbotte, Suzanne, Cessi, Paola, Chang, Grace C., Chase, Zanna, Chereskin, Teresa, Chiba, Sanae, Chisholm, Penny, Christeson, Gail, Cita, Maria Bianca, Class, Cornelia, Coble, Paula, Conte, Maureen, Cooke, Penelope, Cormier, Marie-Helene, Crane, Kathleen, Daly, Kendra L., Darling, Kate, de Angelis, Marie, De La Rocha, Christina, Demopoulos, Amanda W.J., Dierssen, Heidi, Druffel, Ellen R.M., Edmonds, Henrietta N., Edwards, Margo, Erba, Elisabetta, Ercilla, Gemma, Escutia, Carlota, Estrada, Marta, Falkner, Kelly Kenison, Fine, Rana A., Frank, Tracy D., Gardner, Joan M., Gargett, Ann, Garzoli, Silvia L., Gibson, Deidre M., Gillis, Kathryn, Gilbert, Patricia M., Goffredi, Shana K., Greengrove, Cheryl, Hall, Julie, Muller, Pamela Hallock, Hamme, Roberta C., Harada, Naomi, Harwood, Lois, Haymon, Rachel M., Heywood, Karen J., Hickey, Barbara M., Hill, Tessa M., Hooft, Emilie, Hummon, Julia M., Humphris, Susan E., Hutchinson, Deborah R., Ingalls, Anitra E., Isern, Alexandra R., Johns, Elizabeth, Joseph, Leah H., Joye, Samantha (Mandy), Kappel, Ellen S., Karp-Boss, Lee, Karsten, Jill, Kastner, Miriam, Kelley, Deborah S., Kim, Stacy, Klein, Emily M., Kominz, Michelle, Lange, Carina B., Lavín, Alicia M., Lavoie, Dawn, Leinen, Margaret S., Levin, Lisa A., Liepert, Beate, Lightsom, Frances, Lozier, M. Susan, Lynch-Stieglitz, Jean, Manley, Patricia Lee, Marcus, Nancy, Martin, Ellen E., Martini, Marinna, Matrai, Patricia A., McAndrew, Patricia, McClean, Julie, McGregor, Bonnie A., McHugh, Cecilia, McLaughlin, Fiona, McNutt, Marcia, McPhee-Shaw, Erika E., Mills, Rachel A., Moran, Kathryn, Mulholland, Margaret R., Muller-Parker, Gisèle, Mullineaux, Lauren, Neil, Helen, Noble, Marlene, O'Connell, Suzanne, Oppo, Delia, Orellana, Mónica V., Özkan-Haller, Tuba, Pascual, Mercedes, Passow, Uta, Paytan, Adina, Pilskaln, Cindy, Pyrtle, Ashanti J., Raffi, Isabella, Ravelo, Christina, Raymo, Maureen, Reguera, Beatriz, Reimers, Clare E., Reysenbach, Anna-Louise, Richardson, Mary Jo, Rickaby, Rosalind E.M., Rii, Shimi, Malanotte-Rizzoli, Paola, Robertson, Robin, Robinson, Rebecca, Rosenfeld, Leslie, Ross, Robin M., Ruppel, Carolyn, Russell, Ann D., Sabatés, Ana, Schwager, Katherine B., Scranton, Mary, Sherr, Evelyn B., Silver, Mary, Sloyan, Bernadette M., Smith, Deborah K., Sosik, Heidi M., Spitz, Yvette H., Stakes, Debra S., Stathoplos, Linda, Steinberg, Deborah K., Szmant, Alina M., Tachikawa, Kazuyo, Talaue-McManus, Liana, Talley, Lynne D., Tauxe, Lisa, Tester, Patricia A., Thomas, Debbie, Thomas, Ellen, Tolstoy, Maya, Torres, Marta E., Tréhu, Anne, Van Dover, Cindy Lee, Vlahos, Penny, Von Damm, Karen L., Wade, Bridget, Ward, Bess B., Wheeler, Patricia A., Whelan, Jean, White, Lisa D., Whitman, Jill M., Winckler, Gisela, Wishner, Karen F., Wright, Dawn, Wright, Elizabeth, Yalçin-Özdilek, Şükran, Yen, Jeannette, Yuan, Xiaojun, Zingone, Adriana, and Ziveri, Patrizia

Published
2005

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