Sharp gradients in phytoplankton community structure across a frontal zone in the California Current Ecosystem

Taylor, Andrew G.; Goericke, Ralf; Landry, Michael R.; Selph, Karen E.; Wick, Daniel A.; Roadman, Megan J.

doi:10.1093/plankt/fbs036

Cited by 72 publications

(90 citation statements)

References 28 publications

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“…This area is enriched by wind-stress curl, by advective transport from Pt. Conception upwelling, and by eddies, fronts and meanders of the California Current jet, which takes an eastward turn toward the coast in this vicinity (Lynn and Simpson, 1987;Hayward et al, 1995;Peláez and McGowan, 1986;Thomas and Strub, 1990;Haury et al, 1993;Venrick, 2000;Taylor et al, 2012).…”

Section: Seasonal Phytoplankton Trendsmentioning

confidence: 98%

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Temporal and spatial patterns of microbial community biomass and composition in the Southern California Current Ecosystem

Taylor

Landry

Selph

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tAs part of the California Current Ecosystem Long Term Ecological Research (CCE-LTER) Program, samples for epifluorescence microscopy and flow cytometry (FCM) were collected at ten 'cardinal' stations on the California Cooperative Oceanic Fisheries Investigations (CalCOFI) grid during 25 quarterly cruises from 2004 to 2010 to investigate the biomass, composition and size-structure of microbial communities within the southern CCE. Based on our results, we divided the region into offshore, and inshore northern and southern zones. Mixed-layer phytoplankton communities in the offshore had lower biomass (16 7 2 μg C L � 1 ; all errors represent the 95% confidence interval), smaller size-class cells and biomass was more stable over seasonal cycles. Offshore phytoplankton biomass peaked during the winter months. Mixed-layer phytoplankton communities in the northern and southern inshore zones had higher biomass (78722 and 32 79 μg C L � 1 , respectively), larger size-class cells and stronger seasonal biomass patterns. Inshore communities were often dominated by micro-size (20-200 μm) diatoms; however, autotrophic dinoflagellates dominated during late 2005 to early 2006, corresponding to a year of delayed upwelling in the northern CCE. Biomass trends in mid and deep euphotic zone samples were similar to those seen in the mixed-layer, but with declining biomass with depth, especially for larger size classes in the inshore regions. Mixed-layer ratios of autotrophic carbon to chlorophyll a (AC:Chl a) had a mean value of 51.57 5.3. Variability of nitracline depth, bin-averaged AC:Chl a in the mixed-layer ranged from 40 to 80 and from 22 to 35 for the deep euphotic zone, both with significant positive relationships to nitracline depth. Total living microbial carbon, including auto-and heterotrophs, consistently comprised about half of particulate organic carbon (POC).

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Section: Seasonal Phytoplankton Trendsmentioning

confidence: 98%

“…The combined images were processed and analyzed using ImagePro software to semi-automate the enumeration of eukaryotic cells larger than 1.5 μm in length (Taylor et al, 2012).…”

Section: Analysis Of Eukaryotic Nano-and Microplankton By Epifluorescmentioning

confidence: 99%

Temporal and spatial patterns of microbial community biomass and composition in the Southern California Current Ecosystem

Taylor

Landry

Selph

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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“…Rough estimates of APP biomass in Laguna Macapule varied from 0.9 to 63% of the phytoplankton groups, with its highest contribution (>20%) occurring during MarchJuly; this places AAP as the second largest contributor to the total phytoplankton biomass being surpassed only by the autotrophic microplankton contribution. Estimated abundances levels (15-620 × 10 6 cells L −1 ) are of Taylor et al 2012). Noticeable differences in abundance and biomass among phytoplankton size classes suggest that APP has a competitive advantage over the nanoplankton, in the eutrophic Laguna Macapule, which is opposite to that which was observed in non-impacted lagoons of the Gulf of California (Verdugo-Díaz et al…”

Section: Discussionmentioning

confidence: 99%

Influence of agriculture and aquaculture activities on the response of autotrophic picoplankton in Laguna Macapule, Gulf of California (Mexico)

Martínez-López¹,

Hakspiel-Segura²,

Escobedo-Urías³

et al. 2017

Ecol Process

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Introduction: The lagoon is a component of coastal zones, whose populations of autotrophic picoplankton (APP) remain largely unstudied. These lagoons display high-nutrient productivity and additionally may also be subjected to anthropogenic activities. This study selected Laguna Macapule, located on the eastern shore in the mid-region of the Gulf of California, due to the fact that a drainage network servicing the surrounding agricultural region (>230,000 hectares under cultivation) directs irrigation runoff, shrimp farm effluents, and urban wastewater containing large quantities of nutrients to be discharged into this lagoon. We propose to identify the APP's response to various types of environmental and anthropogenic influence in this highly impacted coastal lagoon. Methods: Two sites (separated by 2.7 km) were monitored from December 2007 to December 2008. One, located at the entrance to Laguna Macapule (oceanic influence) and the other a discharge canal (eutrophic conditions) inside the lagoon at El Tortugón.

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“…Picoplankton was excluded from our microscopic analyses. It may contribute substantially to the phytoplankton biomass outside the front (Taylor et al, 2012), but is of minor importance in diatom-dominated waters (Walker and Peterson, 1991). We did not go into detail with the species composition but concentrated on the main phytoplankton groups.…”

Section: Phytoplankton Biomass Composition and Growth Ratesmentioning

confidence: 99%

“…Also on the worldwide scale, studies undertaken in frontal areas detected enhanced phytoplankton production and biomass, primarily in a subsurface maximum. These patterns are mainly explained by physical forcing, for example by wind events that cause vertical nutrient transport especially in these physically dynamic regions (Traganza et al, 1987;Franks, 1992;Largier, 1993;Claustre et al, 1994;Franks and Walstad, 1997;Allen et al, 2005;Landry et al, 2012;Li et al, 2012;Taylor et al, 2012;Krause et al, 2015;Nagai et al, 2015). Correspondingly, also the zooplankton concentration is enhanced .…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton Stimulation in Frontal Regions of Benguela Upwelling Filaments by Internal Factors

Wasmund

Siegel

Bohata³

et al. 2016

Front. Mar. Sci.

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Filaments are intrusions of upwelling water into the sea, separated from the surrounding water by fronts. Current knowledge explains the enhanced primary production and phytoplankton growth found in frontal areas by external factors like nutrient input. The question is whether this enhancement is also caused by intrinsic factors, i.e., simple mixing without external forcing. In order to study the direct effect of frontal mixing on organisms, disturbing external influx has to be excluded. Therefore, mixing was simulated by joining waters originating from "inside" and "outside" the filament in mesocosms ("tanks"). These experiments were conducted during two cruises in the northern Benguela upwelling system in September 2013 and January 2014. The mixed waters reached a much higher net primary production and chlorophyll a (chla) concentration than the original waters already 2-3 days after their merging. The peak in phytoplankton biomass stays longer than the chla peak. After their maxima, primary production rates decreased quickly due to depletion of the nutrients. The increase in colored dissolved organic matter (CDOM) may indicate excretion and degradation. Zooplankton is not quickly reacting on the changed conditions. We conclude that already simple mixing of two water bodies, which occurs generally at fronts between upwelled and ambient water, leads to a short-term stimulation of the phytoplankton growth. However, after the exhaustion of the nutrient stock, external nutrient supply is necessary to maintain the enhanced phytoplankton growth in the frontal area. Based on these data, some generally important ecological factors are discussed as for example nutrient ratios and limitations, silicate requirements and growth rates.

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Sharp gradients in phytoplankton community structure across a frontal zone in the California Current Ecosystem

Cited by 72 publications

References 28 publications

Temporal and spatial patterns of microbial community biomass and composition in the Southern California Current Ecosystem

Temporal and spatial patterns of microbial community biomass and composition in the Southern California Current Ecosystem

Influence of agriculture and aquaculture activities on the response of autotrophic picoplankton in Laguna Macapule, Gulf of California (Mexico)

Phytoplankton Stimulation in Frontal Regions of Benguela Upwelling Filaments by Internal Factors

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