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

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 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.

Plastics in the Pacific: Assessing risk from ocean debris for marine birds in the California Current Large Marine Ecosystem

2020 ◽  
Vol 250 ◽  
pp. 108743
Author(s):  
Thomas P. Good ◽  
Jameal F. Samhouri ◽  
Blake E. Feist ◽  
Chris Wilcox ◽  
Jaime Jahncke
Keyword(s):  
Marine Ecosystem ◽  
California Current ◽  
Marine Birds ◽  
The Pacific ◽  
Large Marine Ecosystem

scholarly journals Exploring local adaptation and the ocean acidification seascape – studies in the California Current Large Marine Ecosystem

2013 ◽  
Vol 10 (7) ◽  
pp. 11825-11856 ◽  
Author(s):  
G. E. Hofmann ◽  
T. G. Evans ◽  
M. W. Kelly ◽  
J. L. Padilla-Gamiño ◽  
C. A. Blanchette ◽  
...  
Keyword(s):  
Environmental Change ◽  
Ocean Acidification ◽  
Marine Invertebrates ◽  
Marine Ecosystem ◽  
California Current ◽  
Biological Data ◽  
Carbonate Chemistry ◽  
Saturation State ◽  
The Future ◽  
Large Marine Ecosystem

Abstract. The California Current Large Marine Ecosystem (CCLME), a temperate marine region dominated by episodic upwelling, is predicted to experience rapid environmental change in the future due to ocean acidification. Aragonite saturation state within the California Current System is predicted to decrease in the future, with near-permanent undersaturation conditions expected by the year 2050. Thus, the CCLME is a critical region to study due to the rapid rate of environmental change that resident organisms will experience and because of the economic and societal value of this coastal region. Recent efforts by a research consortium – the Ocean Margin Ecosystems Group for Acidification Studies (OMEGAS) – has begun to characterize a portion of the CCLME; both describing the mosaic of pH in coastal waters and examining the responses of key calcification-dependent benthic marine organisms to natural variation in pH and to changes in carbonate chemistry that are expected in the coming decades. In this review, we present the OMEGAS strategy of co-locating sensors and oceanographic observations with biological studies on benthic marine invertebrates, specifically measurements of functional traits such as calcification-related processes and genetic variation in populations that are locally adapted to conditions in a particular region of the coast. Highlighted in this contribution are (1) the OMEGAS sensor network that spans the west coast of the US from central Oregon to southern California, (2) initial findings of the carbonate chemistry amongst the OMEGAS study sites, (3) an overview of the biological data that describes the acclimatization and the adaptation capacity of key benthic marine invertebrates within the CCLME.

scholarly journals Exploring local adaptation and the ocean acidification seascape – studies in the California Current Large Marine Ecosystem

2014 ◽  
Vol 11 (4) ◽  
pp. 1053-1064 ◽  
Author(s):  
G. E. Hofmann ◽  
T. G. Evans ◽  
M. W. Kelly ◽  
J. L. Padilla-Gamiño ◽  
C. A. Blanchette ◽  
...  
Keyword(s):  
Environmental Change ◽  
Ocean Acidification ◽  
Marine Invertebrates ◽  
Marine Ecosystem ◽  
California Current ◽  
Biological Data ◽  
Carbonate Chemistry ◽  
Saturation State ◽  
The Future ◽  
Large Marine Ecosystem

Abstract. The California Current Large Marine Ecosystem (CCLME), a temperate marine region dominated by episodic upwelling, is predicted to experience rapid environmental change in the future due to ocean acidification. The aragonite saturation state within the California Current System is predicted to decrease in the future with near-permanent undersaturation conditions expected by the year 2050. Thus, the CCLME is a critical region to study due to the rapid rate of environmental change that resident organisms will experience and because of the economic and societal value of this coastal region. Recent efforts by a research consortium – the Ocean Margin Ecosystems Group for Acidification Studies (OMEGAS) – has begun to characterize a portion of the CCLME; both describing the spatial mosaic of pH in coastal waters and examining the responses of key calcification-dependent benthic marine organisms to natural variation in pH and to changes in carbonate chemistry that are expected in the coming decades. In this review, we present the OMEGAS strategy of co-locating sensors and oceanographic observations with biological studies on benthic marine invertebrates, specifically measurements of functional traits such as calcification-related processes and genetic variation in populations that are locally adapted to conditions in a particular region of the coast. Highlighted in this contribution are (1) the OMEGAS sensor network that spans the west coast of the US from central Oregon to southern California, (2) initial findings of the carbonate chemistry amongst the OMEGAS study sites, and (3) an overview of the biological data that describes the acclimatization and the adaptation capacity of key benthic marine invertebrates within the CCLME.

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