Exudation of organic carbon by marine phytoplankton: dependence on taxon and cell size

López-Sandoval, Daffne C.; Rodríguez‐Ramos, Tamara; Cermeño, Pedro; Marañón, Emilio

doi:10.3354/meps10174

Cited by 45 publications

(36 citation statements)

References 47 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some diatoms release large proportions (> 20%) of fixed carbon as dissolved organic carbon (DOC), but this is highly species-specific (Wetz & Wheeler 2007). Some dinoflagellates show higher percentages of extra cellular release than dia toms (Castillo et al 2010, López-Sandoval et al 2013. However, during the spring bloom in the Baltic Sea, diatom-dominated communities excrete more DOC than mixed or dinoflagellate-dominated communities (Spilling et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Shifts in phytoplankton community structure modify bacterial production, abundance and community composition

Camarena-Gómez¹,

Lipsewers²,

Piiparinen³

et al. 2018

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Shifts in phytoplankton community structure modify bacterial production, abundance and community composition

Camarena-Gómez¹,

Lipsewers²,

Piiparinen³

et al. 2018

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

“…Because the solute concentration around a leaking cell, in the absence of flow, scales with Q / r , where Q is the leakage rate and r the distance from the cell center, then to get at threshold concentration 10 radii away requires a 10 times higher leakage rate than above and, hence, a cell size of approximately 10 1/3 times larger diameter, ca. 150 μ m. A limitation with these model calculations is that while estimates of bulk leakage rates from phytoplankton cells are rather well constrained by observations (Myklestad and Wangersky ; López‐Sandoval et al ), and may be high in senescent or damaged cells (Granum et al ), we know little about the actual chemicals that the copepods may respond to or the threshold concentration for detection. Our calculations have assumed that the copepod would respond to leaking amino acids at concentrations of around typical background concentrations of amino acids in the ocean.…”

Section: Mechanisms Of Remote Detection Of Nonmotile Preymentioning

confidence: 99%

Perceiving the algae: How feeding‐current feeding copepods detect their nonmotile prey

Gonçalves

Kiørboe

2015

Limnology & Oceanography

View full text Add to dashboard Cite

Feeding‐current feeding copepods detect and capture prey individually, but the mechanism by which nonmotile prey is detected has been unclear. Early reports that copepods detect phytoplankton prey at distances of one body length or more led to the hypothesis that solutes leaking from the prey would be carried to the copepod by the sheared feeding current and arrive prior to the prey, thus allowing the copepod to adjust the feeding current to bring the prey within reach of the feeding appendages. Many subsequent studies have been interpreted assuming this mechanism, which appears currently to be the main accepted view. Here, we review the observations available in the literature and add our own data to show that in most cases the prey, whether phytoplankton cells or inert particles, has to be within a few prey radii from the setae of the feeding appendages to elicit a capture response. We further demonstrate that (1) long‐range chemical detection is incompatible with known algal leakage rates and reasonable assumptions of sensitivity, (2) that near‐field chemical detection is constrained by diffusion across the boundary layer of the sensor and takes longer than observed near‐contact times, and (3) that most reported detection distances are well predicted by models of fluid mechanical signal generation and detection. We conclude that near‐field mechanoreception is the common prey detection mode in pelagic copepods. Prey detection distances are thus governed mainly by the reach of the feeding appendages, in contrast to the strong prey size‐dependency implied by remote chemical prey detection.

show abstract

“…The shift from low irradiances within the upper mixed layer to high irradiances during incubation may promote the release of DOCp, possibly due to membrane damage (Myklestad 2000), as demonstrated in natural samples (Mague et al 1980, Panzenböck 2007 or in cultures (Cherrier et al 2014). Although differences in phytoplankton species composition between A Coruña and Vigo, which may influence both the amount and quality of DOCp (Wetz & Wheeler 2007, Sarmento & Gasol 2012, López-Sandoval et al 2013, cannot be ruled out, it seems that differences in hydrographic conditions between these 2 nearby coastal stations determine the processes controlling phytoplanktonic DOC release.…”

Section: Differences In Planktonic Carbon Dynamicsmentioning

confidence: 99%

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Teira

Hernando-Morales²,

Fernández³

et al. 2015

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

We simultaneously studied microbial-mediated carbon fluxes at 2 contrasting sites within the coastal upwelling system off Galicia, near A Coruña and Vigo, Spain, over an annual cycle in order to compare the fraction of primary production released as dissolved organic carbon (DOC) and the degree of coupling between bacteria and phytoplankton. A significant fraction of primary production was released as DOC at both sites, averaging ~30%. DOC release ac counted for, on average, 30% of the total bacterial carbon demand, which is indicative of a moderate trophic dependence of bacteria on phytoplankton in these coastal ecosystems. Nevertheless, differences in hydrographic conditions associated with stronger upwelling pulses off Vigo, and deeper upper mixed layers during the downwelling period off A Coruña, led to significant differences in phytoplankton dynamics and the subsequent direct coupling with heterotrophic bacteria. Strong direct coupling between phytoplankton extracellular release and bacterial production (BP) was found off Vigo, which could be related to the quality of the DOC produced by actively growing phytoplankton. By contrast, DOC release and BP rates were decoupled off A Coruña, likely due to unaccounted DOC associated with indirect trophic processes or to the low availability of freshly produced exudates associated with overflow or photoinhibition mechanisms.

show abstract

Exudation of organic carbon by marine phytoplankton: dependence on taxon and cell size

Cited by 45 publications

References 47 publications

Shifts in phytoplankton community structure modify bacterial production, abundance and community composition

Shifts in phytoplankton community structure modify bacterial production, abundance and community composition

Perceiving the algae: How feeding‐current feeding copepods detect their nonmotile prey

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

Contact Info

Product

Resources

About