Relationships between the Chemical Composition of Particulate Organic Matter and Phytoplankton Distributions in Recently Upwelled Waters off Peru

Sellner, Kevin G.; Hendrikson, P.; Ochoa, Noemí

doi:10.1007/978-1-4615-6651-9_14

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…This community most closely resembled ones that have been described from the Peruvian shelf region (Rojas de Mendiola 1981; Sellner et al 1983). In the Peru Upwelling experiment, virtually all of the diatom growth in response to added Fe was by an abundant but very small species of unicellular pennate diatom.…”

Section: Discussionsupporting

confidence: 82%

“…Surprisingly, it was only at the offshore Humboldt Current station that large diatoms (mostly chain-forming pennates) made a significant contribution to community biomass after Fe addition. This community most closely resembled ones that have been described from the Peruvian shelf region (Rojas de Mendiola 1981;Sellner et al 1983). In the Peru Upwelling experiment, virtually all of the diatom growth in response to added Fe was by an abundant but very small species of unicellular pennate diatom.…”

Section: Discussionsupporting

confidence: 80%

“…In the Peru Upwelling experiment, virtually all of the diatom growth in response to added Fe was by an abundant but very small species of unicellular pennate diatom. Similar small pennate diatom-dominated assemblages have been observed in the past around the Galapagos Islands (Jiminez 1981) and in areas just off the South American shelf (Sellner et al 1983). The reasons for these differences between Fe effects on diatom community composition in the North and South American ecosystems are unknown, but size structure differences could have large implications for trophic dynamics, nutrient cycles, and, especially, vertical fluxes of elements (Boyd and Newton 1999) in the two regions.…”

Section: Discussionmentioning

confidence: 53%

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Phytoplankton iron limitation in the Humboldt Current and Peru Upwelling

Hutchins

Hare

Weaver

et al. 2002

Limnology & Oceanography

219

130

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We investigated phytoplankton Fe limitation using shipboard incubation experiments in the high-nutrient South American eastern boundary current regime. Low ambient Fe concentrations (ϳ0.1 nM) in water collected from the Humboldt and Peru Currents were supplemented with a range of added Fe levels up to 2.5 nM. Phytoplankton chlorophyll a, photosystem II photosynthetic efficiency, and nitrate and phosphate drawdown increased in proportion to the amount of Fe added. The Humboldt Current algal community after Fe additions included colonial and flagellated Phaeocystis globosa and large pennate diatoms, whereas the Peru Upwelling assemblage was dominated by coccolithophorids and small pennate diatoms. Apparent half-saturation constants for growth of the two communities were 0.17 nM Fe (Humboldt Current) and 0.26 nM Fe (Peru Upwelling). Net molar dissolved Si(OH) 4 : NO drawdown ratios were low in both experiments (ϳ0.2-0.7), but net particulate silica to nitrogen production Ϫ 3 ratios were higher. Fe limitation decreased net NO : PO utilization ratios in the Humboldt Current incubation to

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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 53%

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Phytoplankton iron limitation in the Humboldt Current and Peru Upwelling

Hutchins

Hare

Weaver

et al. 2002

Limnology & Oceanography

219

130

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“…It greatly depends on the nature of food, on the content in it of mineral components, Jor instance, mineral particles of suspended material, diatom valves, etc. Sellner et al 1983). The decomposition rate of OM in fecal pellets formed on natural food is much lower than that of dead organisms.…”

Section: S1 Trophic System and The Passive Settling Of Particlesmentioning

confidence: 99%

Geochemistry of Organic Matter in the Ocean

Romankevich¹

1984

258

122

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“…However, although often neglected, dinoflagellates are also usually present in the water column in relatively low numbers (Blasco, 1971;Guillen et al, 1971;Rojas de Mendiola, 1974;Rojas de Mendiola and Estrada, 1976;Sukhanova et al, 1978;Ochoa and Gomez, 1981;Rojas de Mendiola, 1981;Sellner et al, 1983;Ochoa and Gomez, 1987). Although only a certain percentage of dinoflagellate species form cysts, and only a proportion of these are fossilizable, we might expect some record of their presence and fluctuations in the sediments.…”

Section: Introductionmentioning

confidence: 99%

Quaternary Dinoflagellate Cysts from the Upwelling System offshore Peru, Hole 686B, ODP Leg 112

Lewis¹,

Dodge²,

Powell³

1990

Proceedings of the Ocean Drilling Program

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The dinoflagellate cyst assemblages from Quaternary sediments of Ocean Drilling Program (ODP) Hole 686B were determined. Results were interpreted as showing that under strong upwelling conditions assemblages are enriched with peridiniacean cysts, in contrast to weak upwelling situations where gonyaulacacean cysts become dominant. Results are discussed in relation to current planktonic assemblages and lifestyles. This possibly extends the use of dinoflagellates as paleoecological indicators in this region.

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Relationships between the Chemical Composition of Particulate Organic Matter and Phytoplankton Distributions in Recently Upwelled Waters off Peru

Cited by 8 publications

References 16 publications

Phytoplankton iron limitation in the Humboldt Current and Peru Upwelling

Phytoplankton iron limitation in the Humboldt Current and Peru Upwelling

Geochemistry of Organic Matter in the Ocean

Quaternary Dinoflagellate Cysts from the Upwelling System offshore Peru, Hole 686B, ODP Leg 112

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