Article
Environmental Sciences
Tanja Stratmann
Summary: The Clarion-Clipperton Fracture Zone (CCZ) in the central Pacific contains large densities of polymetallic nodules that are important for metal extraction and host deep-sea fauna. A recent study estimated that removing these nodules would result in a loss of up to 18% of all taxa in the CCZ. This study assesses the impact of removing nodule-dependent fauna on carbon cycling in the eastern CCZ and found that it only has a small effect on total carbon cycling.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Adam Subhas, Sijia Dong, John D. Naviaux, Nick E. Rollins, Patrizia Ziveri, William Gray, James W. B. Rae, Xuewu Liu, Robert H. Byrne, Sang Chen, Christopher Moore, Loraine Martell-Bonet, Zvi Steiner, Gilad Antler, Huanting Hu, Abby Lunstrum, Yi Hou, Nathaniel Kemnitz, Johnny Stutsman, Sven Pallacks, Mathilde Dugenne, Paul D. Quay, William M. Berelson, Jess F. Adkins
Summary: The cycling of biologically produced calcium carbonate in the ocean is crucial for the global carbon cycle. This study investigates the dissolution rates of coccolith and foraminiferal calcite and combines them with other data to understand the alkalinity cycle in the shallow North Pacific Ocean. The findings show that the dissolution rates are too slow to explain the sinking flux of calcium carbonate and the regeneration of alkalinity. Instead, the dissolution is driven by the ambient saturation state and oxygen consumption, which explains the patterns of calcium carbonate flux and alkalinity regeneration in the North Pacific.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Limnology
Megan E. Duffy, Jacquelyn A. Neibauer, Jamee Adams, Rachel A. Lundeen, Gabrielle Rocap, Anitra E. Ingalls, Clara A. Fuchsman, Richard G. Keil
Summary: This study identified peptides in suspended and sinking particles from the oxygen-deficient zone in the eastern tropical North Pacific and in a culture of the cyanobacterium Prochlorococcus using a de novo-discovery approach. The results show that de novo peptides are taxonomically specific and can enhance database-driven methods. The analysis of the particles also revealed the presence of fungal proteins in deep sinking particles, suggesting the important role of fungi in marine organic matter cycling. Additionally, observations were made on the post-translationally modified cyanobacterial peptides in the sediment trap sample, indicating the association between cellular location and early preservation in the detrital pool. The presence of modified amino acids in sinking and suspended particles suggests that extracellular protein degradation contributes to the pools of refractory organic nitrogen.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Multidisciplinary Sciences
Katja Uhlenkott, Erik Simon-Lledo, Annemiek Vink, Pedro Martinez Arbizu
Summary: The eastern Clarion Clipperton Fracture Zone (CCZ) is a heterogeneous abyssal environment with low abundances of diverse megafauna communities. Potential mining of polymetallic nodules threatens these communities, calling for detailed spatial investigation. Based on the predicted probability of occurrence of different morphotypes, the study area was divided into three assemblages, with highest richness predicted at seamount sites and lowest richness in the western part of the study area. The presence of differentiated megafauna assemblages in prospective nodule fields highlights the importance of considering the geological and biological heterogeneity in monitoring and management schemes.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Colette L. Kelly, Nicole M. Travis, Pascale A. Baya, Karen L. Casciotti
Summary: By analyzing N2O concentration and isotopologues in the eastern tropical North Pacific (ETNP), it was found that high N2O levels observed at some stations may be due to unique conditions supporting high rates of N2O production. Additionally, the study revealed different sources and potential mechanisms contributing to N2O cycling in oxygen deficient zones.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Limnology
Xiaopeng Bian, Shun-Chung Yang, Kenneth M. Bolster, Rintaro Moriyasu, James W. Moffett, Seth G. John
Summary: Oxygen-deficient zones play a crucial role in the distribution and cycling of trace metals in the ocean. This study presents data from the Eastern Tropical North Pacific ODZ, revealing concentrations of metals and their correlations with nutrients, iodine speciation, and microbial activity. High concentrations of manganese and cerium were observed in low-oxygen seawater, coinciding with secondary nitrite maxima and the lowest oxygen concentrations, highlighting the importance of microbial processes in metal cycling.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Qiangqiang Zhong, Tao Yu, Hui Lin, Jing Lin, Jianda Ji, Jialin Ni, Jinzhou Du, Dekun Huang
Summary: Estimating POC fluxes using Po-210-Pb-210 disequilibria in seawater samples from the western North Pacific Ocean, researchers found different distributions of Po-210 and Pb-210 in the euphotic zone and deep ocean regions.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Marine & Freshwater Biology
Yeon Jee Suh, Min-Seob Kim, Won-Kyung Lee, Hyunjin Yoon, Inkyeong Moon, Jaewoo Jung, Se-Jong Ju
Summary: This study investigated energy sources and trophic interactions among vent fauna in deep-sea hydrothermal vents in the North Fiji Basin. The findings indicate that symbiont-bearing taxa have different carbon fixation pathways or nutrient preferences. Niche partitioning was observed among omnivores, with different resources or microhabitats being utilized. The crab was found to be the top predator in the ecosystem, consuming a variety of prey but with a lower preference for mussels. Overall, the vent fauna displayed non-overlapping diets and spatial niches, with each taxon having unique energy sources.
Article
Limnology
Margot E. White, Patrick A. Rafter, Brandon M. Stephens, Matthew R. Mazloff, Scott D. Wankel, Lihini I. Aluwihare
Summary: In eastern boundary current systems, coastal upwelling plays a vital role in influencing the surface ocean dynamics and productivity. This study investigated the seasonal, interannual, and spatial variations of nitrate isotopes in two coastal upwelling regimes in California. The results revealed that nitrate utilization and iron limitation of diatom productivity were the major drivers of euphotic zone nitrate isotopes. The El Nino conditions in 2015-2016 led to increased nitrate utilization and isotopic enrichment. Moreover, the differential enrichment of nitrogen and oxygen isotopes indicated a shift in phytoplankton's reliance on locally nitrified nitrate during warmer and stratified periods.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Sen Du, Yanyan Zhou, Li Zhang
Summary: In this study, the bioaccumulation and trophic transfer of arsenic in Daya Bay were systematically investigated. The results showed that arsenic concentrations in organisms and environmental samples varied by season and demonstrated biomagnification along trophic transfer in the food web. The study suggested that a benthic habit was an important promoter for arsenic biomagnification in marine food webs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Emmelie K. L. Astrom, Bodil A. Bluhm, Tine L. Rasmussen
Summary: This study investigates the extent of chemosynthesis-based carbon entering the food web in a high latitude shelf-system and finds it plays an important role in supporting benthic organisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Kevin H. Wyatt, Kevin S. McCann, Allison R. Rober, Merritt R. Turetsky
Summary: In peatlands, nutrient availability and trophic interactions both play a role in influencing carbon fluxes, with nutrients stimulating decomposition processes while predator-prey dynamics can either accelerate or reduce CO2 emissions.
Article
Environmental Sciences
Qiang Ma, Yusheng Qiu, Run Zhang, E. Lv, Yipu Huang, Min Chen
Summary: The study aimed to reveal small-scale particle dynamics in the eastern tropical North Pacific through Po-210/Pb-210 disequilibrium. Results showed significant deficiency of total Po-210 in oligotrophic seas and fractionation between dissolved and particulate Po-210 and Pb-210 in the scavenging process.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Limnology
Heather M. McNair, Francoise Morison, Jason R. Graff, Tatiana A. Rynearson, Susanne Menden-Deuer
Summary: Microzooplankton grazing has a significant impact on phytoplankton growth and abundance, leading to a decrease in phytoplankton quantity balanced by an increase in phytoplankton cell size. The grazing rate of microzooplankton greatly affects the growth rate of phytoplankton, aligning closely with the observed dynamics of phytoplankton biomass.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Dan Fu, Ping Chang, Christina M. Patricola, R. Saravanan, Xue Liu, Hylke E. Beck
Summary: The Central American mountains play a role in reducing tropical cyclone activity in the eastern North Pacific by interrupting moisture transport from the Caribbean Sea on a seasonal timescale, reducing TC activity by up to 35%.
NATURE COMMUNICATIONS
(2021)
Article
Oceanography
Katherine M. Dunlop, Linda A. Kuhnz, Henry A. Ruhl, Christine L. Huffard, David W. Caress, Richard G. Henthorn, Brett W. Hobson, Paul McGill, Kenneth L. Smith
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2015)
Article
Ecology
K. M. Dunlop, G. D. Ruxton, E. M. Scott, D. M. Bailey
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2015)
Article
Limnology
Kathy M. Dunlop, Daniel O. B. Jones, Andrew K. Sweetman
LIMNOLOGY AND OCEANOGRAPHY
(2018)
Review
Environmental Sciences
Andrew K. Sweetman, Andrew R. Thurber, Craig R. Smith, Lisa A. Levin, Camilo Mora, Chih-Lin Wei, Andrew J. Gooday, Daniel O. B. Jones, Michael Rex, Moriaki Yasuhara, Jeroen Ingels, Henry A. Ruhl, Christina A. Frieder, Roberto Danovaro, Laura Wurzberg, Amy Baco, Benjamin M. Grupe, Alexis Pasulka, Kirstin S. Meyer, Katherine M. Dunlop, Lea-Anne Henry, J. Murray Roberts
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2017)
Article
Oceanography
Katherine M. Dunlop, Toby Jarvis, Kelly J. Benoit-Bird, Chad M. Waluk, David W. Caress, Hans Thomas, Kenneth L. Smith
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2018)
Article
Marine & Freshwater Biology
Katherine M. Dunlop, E. Marian Scott, Darren Parsons, David M. Bailey
MARINE ECOLOGY-AN EVOLUTIONARY PERSPECTIVE
(2015)
Article
Biodiversity Conservation
Katherine M. Dunlop, David K. A. Barnes, David M. Bailey
Article
Multidisciplinary Sciences
Kathy M. Dunlop, Daniel O. B. Jones, Andrew K. Sweetman
SCIENTIFIC REPORTS
(2017)
Article
Oceanography
K. M. Dunlop, K. J. Benoit-Bird, C. M. Waluk, R. G. Henthorn
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Marine & Freshwater Biology
Catherine Lalande, Kathy Dunlop, Paul E. Renaud, Gabrielle Nadai, Andrew K. Sweetman
ESTUARINE COASTAL AND SHELF SCIENCE
(2020)
Article
Biodiversity Conservation
Kathy M. Dunlop, Mark Wipfli, Rune Muladal, Grzegorz Wierzbinski
Summary: This study identified terrestrial and sub-aquatic vertebrate scavengers on pink salmon carcasses in a sub-arctic river in northern Norway, with red foxes being the largest consumers. Carcasses entering Vesterelv River in 2019 were estimated to provide energy and nutrients an order of magnitude lower than in the Pacific Northwest. The results provide valuable information on energy and nutrient transfer from introduced Pacific pink salmon to riparian environments in northern Europe.
BIOLOGICAL INVASIONS
(2021)
Article
Fisheries
Kathy Dunlop, Antti P. Eloranta, Erik Schoen, Mark Wipfli, Jenny L. A. Jensen, Rune Muladal, Guttorm N. Christensen
Summary: Recent research has shown that some native Atlantic salmon and brown trout in North European rivers may consume large quantities of pink salmon eggs, deriving marine-derived nutrients and energy from them. While the overall population-level impact of egg consumption and marine-derived nutrients in fish body tissues is minor, a few individuals have been found to have a long-term diet subsidized by pink salmon eggs.
ECOLOGY OF FRESHWATER FISH
(2021)
Article
Biodiversity Conservation
K. Dunlop, P. E. Renaud, J. Berge, D. O. B. Jones, R. P. Harbour, A. H. S. Tandberg, A. K. Sweetman
Summary: In high latitude coastal regions, benthic scavenger communities mainly consist of invertebrates, with warmer fjords influenced by Atlantic waters having higher species richness compared to cold fjords in Svalbard. This study demonstrates the potential ecosystem responses to warming in Arctic and Subarctic fjords, highlighting the dominance of certain scavenger species in different environmental conditions.
Review
Environmental Sciences
Erik E. Cordes, Daniel O. B. Jones, Thomas A. Schlacher, Diva J. Amon, Angelo F. Bernardino, Sandra Brooke, Robert Carney, Danielle M. DeLeo, Katherine M. Dunlop, Elva G. Escobar-Briones, Andrew R. Gates, Luciana Genio, Judith Gobin, Lea-Anne Henry, Santiago Herrera, Sarah Hoyt, Mandy Joye, Salit Kark, Nelia C. Mestre, Anna Metaxas, Simone Pfeifer, Kerry Sink, Andrew K. Sweetman, Ursula Witte
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2016)