scholarly journals Quantitative Biogeography: Large-Scale, Long-Term Change in the Rocky Intertidal Region of the California Current Large Marine Ecosystem

Oceanography ◽  
2019 ◽  
Vol 32 (3) ◽  
pp. 26-37 ◽  
Author(s):  
Peter Raimondi ◽  
◽  
C. Melissa Miner ◽  
Bruce Menge ◽  
Carol Blanchette ◽  
...  
Keyword(s):  
Large Scale ◽  
Marine Ecosystem ◽  
California Current ◽  
Rocky Intertidal ◽  
Term Change ◽  
Large Marine Ecosystem

scholarly journals Combining otolith microstructure and trace elemental analyses to infer the arrival of juvenile Pacific bluefin tuna in the California current ecosystem

2015 ◽  
Vol 72 (7) ◽  
pp. 2128-2138 ◽  
Author(s):  
Hannes Baumann ◽  
R. J. D. Wells ◽  
Jay R. Rooker ◽  
Saijin Zhang ◽  
Zofia Baumann ◽  
...  
Keyword(s):  
Marine Ecosystem ◽  
Fork Length ◽  
California Current ◽  
Bluefin Tuna ◽  
Otolith Microstructure ◽  
Pacific Bluefin Tuna ◽  
Thunnus Orientalis ◽  
Trace Elemental ◽  
Large Marine Ecosystem ◽  
Age Estimates

Abstract Juvenile Pacific bluefin tuna (PBT, Thunnus orientalis) are known to migrate from western Pacific spawning grounds to their eastern Pacific nursery and feeding grounds in the California Current Large Marine Ecosystem (CCLME), but the timing, durations, and fraction of the population that makes these migrations need to be better understood for improved management. To complement recent work focused on stable isotope and radiotracer approaches (“tracer toolbox”; Madigan et al., 2014) we explored the suitability of combining longitudinal analyses of otolith microstructure and trace elemental composition in age ∼1–2 PBT (n = 24, 66–76 cm curved fork length) for inferring the arrival of individuals in the CCLME. Element:Ca ratios in transverse otolith sections (9–12 rows, triplicate ablations from primordium to edge, ø50 μm) were quantified for eight elements: Li, Mg, Mn, Co, Cu, Zn, Sr, and Ba, which was followed by microstructure analysis to provide age estimates corresponding to each ablation spot. Age estimates from otoliths ranged from 328 to 498 d post-hatch. The combined elemental signatures of four elements (Ba, Mg, Co, Cu) showed a significant increase at the otolith edge in approximately half of the individuals (30–60 d before catch). Given the different oceanographic properties of oligotrophic open Pacific vs. high nutrient, upwelling CCLME waters, this signal is consistent with the entry of the fish into the CCLME, which was estimated to occur primarily in July after a transoceanic migration of ∼1.5–2.0 months. Our approach comprises a useful addition to the available tracer toolbox and can provide additional and complementary understanding of trans-Pacific migration patterns in PBT.

scholarly journals Climate vulnerability assessment for Pacific salmon and steelhead in the California Current Large Marine Ecosystem

PLoS ONE ◽  
2019 ◽  
Vol 14 (7) ◽  
pp. e0217711 ◽  
Author(s):  
Lisa G. Crozier ◽  
Michelle M. McClure ◽  
Tim Beechie ◽  
Steven J. Bograd ◽  
David A. Boughton ◽  
...  
Keyword(s):  
Vulnerability Assessment ◽  
Pacific Salmon ◽  
Marine Ecosystem ◽  
California Current ◽  
Large Marine Ecosystem ◽  
Climate Vulnerability

DETECTING LONG-TERM CHANGE IN COMPLEX COMMUNITIES: A CASE STUDY FROM THE ROCKY INTERTIDAL ZONE

2005 ◽  
Vol 15 (5) ◽  
pp. 1813-1832 ◽  
Author(s):  
John R. Steinbeck ◽  
David R. Schiel ◽  
Michael S. Foster
Keyword(s):  
Intertidal Zone ◽  
Rocky Intertidal ◽  
Rocky Intertidal Zone ◽  
Term Change

scholarly journals Dynamical connections between large marine ecosystems of austral South America based on numerical simulations

Ocean Science ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 271-290 ◽  
Author(s):  
Karen Guihou ◽  
Alberto R. Piola ◽  
Elbio D. Palma ◽  
Maria Paz Chidichimo
Keyword(s):  
South America ◽  
Interannual Variability ◽  
Large Scale ◽  
Marine Ecosystem ◽  
Outer Part ◽  
Marine Ecosystems ◽  
Seasonal And Interannual Variability ◽  
Magellan Strait ◽  
The Pacific ◽  
Large Marine Ecosystem

Abstract. The Humboldt Large Marine Ecosystem (HLME) and Patagonian Large Marine Ecosystem (PLME) are the two largest marine ecosystems in the Southern Hemisphere and are respectively located along the Pacific and Atlantic coasts of southern South America. This work investigates the exchange between these two LMEs and its seasonal and interannual variability by employing numerical model results and offline particle-tracking algorithms. Our analysis suggests a general poleward transport on the southern region of the HLME, a well-defined flux from the Pacific to the Atlantic, and equatorward transport on the PLME. Lagrangian simulations show that the majority of the southern PS waters originate from the upper layer in the southeast South Pacific (<200 m), mainly from the southern Chile and Cape Horn shelves. The exchange takes place through the Le Maire Strait, Magellan Strait, and the shelf break. These inflows amount to a net northeastward transport of 0.88 Sv at 51∘ S in the southern PLME. The transport across the Magellan Strait is small (0.1 Sv), but due to its relatively low salinity it greatly impacts the density and surface circulation of the coastal waters of the southern PLME. The water masses flowing into the Malvinas Embayment eventually reach the PLME through the Malvinas Shelf and occupy the outer part of the shelf. The seasonal and interannual variability of the transport are also addressed. On the southern PLME, the interannual variability of the shelf exchange is partly explained by the large-scale wind variability, which in turn is partly associated with the Southern Annular Mode (SAM) index (r=0.52).

scholarly journals Spatial organization of krill and seabirds in the central California Current

2011 ◽  
Vol 68 (7) ◽  
pp. 1391-1402 ◽  
Author(s):  
Jarrod A. Santora ◽  
Stephen Ralston ◽  
William J. Sydeman
Keyword(s):  
Relative Abundance ◽  
Large Scale ◽  
Spatial Organization ◽  
Marine Ecosystem ◽  
California Current ◽  
Habitat Associations ◽  
Ecosystem Dynamics ◽  
Seabird Species ◽  
Central California ◽  
Shelf Slope

AbstractSantora, J. A., Ralston, S., and Sydeman, W. J. 2011. Spatial organization of krill and seabirds in the central California Current. – ICES Journal of Marine Science, 68: 1391–1402. The hypothesis that krill and krill–predator spatial organization and abundance co-vary interannually was tested by investigating the spatial organization of krill and planktivorous seabirds in the central California Current ecosystem over 5 years of varying oceanographic conditions, 2002–2006. To measure the abundance and distribution of krill, data were integrated from large-scale hydroacoustic surveys and station-based net samples, and these data linked to concurrent shipboard visual surveys of seabirds. Acoustically based estimates of the relative abundance of krill were correlated with net samples of Euphausia pacifica, suggesting that acoustic signals mainly reflected the distribution of this numerically dominant species. The distribution and abundance of krill displayed marked changes over years, but the characteristic spatial scale of krill and seabirds remained similar (1–4 nautical miles), confirming the hypothesis of covariance in spatial structure. Krill and the seabird species investigated showed similar habitat associations, i.e. the outer shelf and shelf–slope region, showing that the at-sea distributions of seabirds can provide information on the presence/absence of krill patches. The results also underscore the importance of measuring spatial organization as well as relative abundance in promoting better understanding of predator–prey and marine ecosystem dynamics.

scholarly journals Improving Metabarcoding Taxonomic Assignment: A Case Study of Fishes in a Large Marine Ecosystem

2021 ◽  
Author(s):  
Zachary Gold ◽  
Emily Curd ◽  
Kelly Goodwin ◽  
Emma Choi ◽  
Benjamin Frable ◽  
...  
Keyword(s):  
Marine Ecosystem ◽  
Economic Value ◽  
Molecular Ecology ◽  
California Current ◽  
Reference Sequence ◽  
Taxonomic Assignment ◽  
Global Database ◽  
Assignment Accuracy ◽  
Large Marine Ecosystem

DNA metabarcoding is an important tool for molecular ecology. However, its effectiveness hinges on the quality of reference sequence databases and classification parameters employed. Here we evaluate the performance of MiFish 12S taxonomic assignments using a case study of California Current Large Marine Ecosystem fishes to determine best practices for metabarcoding. Specifically, we use a taxonomy cross-validation by identity framework to compare classification performance between a global database comprised of all available sequences and a curated database that only includes sequences of fishes from the California Current Large Marine Ecosystem. We demonstrate that the curated, regional database provides higher assignment accuracy than the comprehensive global database. We also document a tradeoff between accuracy and misclassification across a range of taxonomic cutoff scores, highlighting the importance of parameter selection for taxonomic classification. Furthermore, we compared assignment accuracy with and without the inclusion of additionally generated reference sequences. To this end, we sequenced tissue from 605 species using the MiFish 12S primers, adding 253 species to GenBank’s existing 550 California Current Large Marine Ecosystem fish sequences. We then compared species and reads identified from seawater environmental DNA samples using global databases with and without our generated references, and the regional database. The addition of new references allowed for the identification of 16 native taxa and 17.0% of total reads from eDNA samples, including species with vast ecological and economic value. Together these results demonstrate the importance of comprehensive and curated reference databases for effective metabarcoding and the need for locus-specific validation efforts.

scholarly journals Using integrated, ecosystem-level management to address intensifying ocean acidification and hypoxia in the California Current large marine ecosystem

Elem Sci Anth ◽  
2017 ◽  
Vol 5 ◽  
Author(s):  
Terrie Klinger ◽  
Elizabeth A. Chornesky ◽  
Elizabeth A. Whiteman ◽  
Francis Chan ◽  
John L. Largier ◽  
...  
Keyword(s):  
Ocean Acidification ◽  
Marine Protected Areas ◽  
Abrupt Change ◽  
Marine Ecosystem ◽  
California Current ◽  
Management Actions ◽  
Global Emission ◽  
Ecosystem Level ◽  
Large Marine Ecosystem ◽  
Management Approaches

Ocean acidification is intensifying and hypoxia is projected to expand in the California Current large marine ecosystem as a result of processes associated with the global emission of CO2. Observed changes in the California Current outpace those in many other areas of the ocean, underscoring the pressing need to adopt management approaches that can accommodate uncertainty and the complicated dynamics forced by accelerating change. We argue that changes occurring in the California Current large marine ecosystem provide opportunities and incentives to adopt an integrated, systems-level approach to resource management to preserve existing ecosystem services and forestall abrupt change. Practical options already exist to maximize the benefits of management actions and ameliorate impending change in the California Current, for instance, adding ocean acidification and hypoxia to design criteria for marine protected areas, including consideration of ocean acidification and hypoxia in fisheries management decisions, and fully enforcing existing laws and regulations that govern water quality and land use and development.

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