Expansion and homogeneity of the vertical distribution of zooplankton in a very deep mixed layer

Farstey, Viviana; Lazar, Boáz; Genin, Amatzia

doi:10.3354/meps238091

Cited by 36 publications

(20 citation statements)

References 32 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Silicate concentrations in particular can be of atmospheric origin in addition to the sources resulting from oceanic physical and biogeochemical processes. These high nutrient concentrations associated with suitable conditions for primary productivity (reasonably high irradiance and warm sea water) lead to increased primary productivity resulting in higher chlorophyll a concentrations [2,23,24]. However, there were some exceptions to this seasonal pattern, where anthropogenic factors superseded the natural seasonal cycle.…”

Section: Discussionmentioning

confidence: 98%

Sea-water seasonal changes at a heavy tourism investment site on the Jordanian northern coast of the Gulf of Aqaba, Red Sea

Badran¹,

Manasrah²,

Rasheed³

2006

Chemistry and Ecology

View full text Add to dashboard Cite

The Gulf of Aqaba exhibits a strong seasonality due to convective mixing during winter and stratification during summer. The present study provides a detailed appraisal of summer and winter sea-water characteristics at the northern coast of the Gulf of Aqaba, that is witnessing rapid development and increasing changes in its geomorphological characteristics. Sea-water temperature, salinity, nutrients, and chlorophyll a concentrations were measured biweekly at five coastal and four cross-sectional stations during the periods February to April and July to September 2004. Meteorological conditions were continuously recorded at the Marine Science Station. The coastal study sites included four open coastal stations and a marina with one-way exchange with the open water. The effect of convective mixing was clearly apparent on the sea-water characteristics. Natural seasonal characteristics of higher nutrients and chlorophyll a concentrations were recorded during winter at most of the open coastal stations. In the cross-sectional stations, the concentrations of nutrients and chlorophyll a were not different between the surface and the bottom during winter, but the bottom waters had generally higher concentrations during summer. Some deviations from the natural seasonal cycle were recorded at the marina and other coastal stations. Here, higher nutrient and chlorophyll a concentrations were recorded in summer than in winter. These deviations that are most likely due to anthropogenic effects are discussed.

show abstract

Section: Discussionmentioning

confidence: 98%

Sea-water seasonal changes at a heavy tourism investment site on the Jordanian northern coast of the Gulf of Aqaba, Red Sea

Badran¹,

Manasrah²,

Rasheed³

2006

Chemistry and Ecology

View full text Add to dashboard Cite

show abstract

“…Moreover, given the fact that zooplankton can retain infectious viruses up to 28 hr after interacting with infected cells ( Figures 3B and 3C), we propose that zooplankters can translocate viruses over significantly large distances. Copepods and other grazers can actively migrate up and down the water column over tens to hundreds of meters on a daily basis [31][32][33] (often explained as a strategy to avoid predation by visual hunters during the day [34]), piercing through stratified waters and maintaining their position near convergent fronts and pycnoclines, where current flows are reduced and food is abundant [11,35,36]. Interestingly, E. huxleyi blooms typically form a peak layer just above the pycnocline boundary layer [8,37].…”

Section: Zooplankton As Vector Of Transmission For Algal Virusesmentioning

confidence: 98%

Zooplankton May Serve as Transmission Vectors for Viruses Infecting Algal Blooms in the Ocean

et al. 2014

View full text Add to dashboard Cite

Marine viruses are recognized as a major driving force regulating phytoplankton community composition and nutrient cycling in the oceans. Yet, little is known about mechanisms that influence viral dispersal in aquatic systems, other than physical processes, and that lead to the rapid demise of large-scale algal blooms in the oceans. Here, we show that copepods, abundant migrating crustaceans that graze on phytoplankton, as well as other zooplankton can accumulate and mediate the transmission of viruses infecting Emiliania huxleyi, a bloom-forming coccolithophore that plays an important role in the carbon cycle. We detected by PCR that >80% of copepods collected during a North Atlantic E. huxleyi bloom carried E. huxleyi virus (EhV) DNA. We demonstrated by isolating a new infectious EhV strain from a copepod microbiome that these viruses are infectious. We further showed that EhVs can accumulate in high titers within zooplankton guts during feeding or can be adsorbed to their surface. Subsequently, EhV can be dispersed by detachment or via viral-dense fecal pellets over a period of 1 day postfeeding on EhV-infected algal cells, readily infecting new host populations. Intriguingly, the passage through zooplankton guts prolonged EhV's half-life of infectivity by 35%, relative to free virions in seawater, potentially enhancing viral transmission. We propose that zooplankton, swimming through topographically adjacent phytoplankton micropatches and migrating daily over large areas across physically separated water masses, can serve as viral vectors, boosting host-virus contact rates and potentially accelerating the demise of large-scale phytoplankton blooms.

show abstract

“…4). Due to the large year-to-year variations in the winter mixing depth in the Gulf of Aqaba (~300 to >800 m, Genin et al, 1995;Farstey et al, 2002), the inter-annual variations in phytoplankton succession may be very large, in Fig. 4 Phytoplankton dynamics in tropical and subtropical seas, expressed as coefficient of variation in Chl a concentrations over an annual cycle, with function of mixed layer depth.…”

Section: Regional Comparisonmentioning

confidence: 99%

Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea

et al. 2006

View full text Add to dashboard Cite

Seawater samples were collected biweekly from the northern Gulf of Aqaba, Red Sea, for Phytoplankton analysis during the period May 1998 to October 1999. Microscopic counts and HPLC methods were employed. Procaryotic and eucaryotic ultraplankton dominated throughout most of the year, with larger nano-and microplankton making up only 5% of the photosynthetic biomass. Moderate seasonal variations in the 0-125 m integrated Chl a contrasted with a pronounced seasonal succession of the major taxonomic groups, reflecting the changes in the density stratification of the water column: Prochlorococcus dominated during the stratified summer period and were almost absent in winter. Chlorophyceae and Cryptophyceae were dominant during winter mixing but scarce or absent during summer. Diatoms and Synechococcus showed sharp and moderate biomass peaks in late winter and spring respectively, but remained at only low Chl a levels for the rest of the year. Chrysophyceae, Prymnesiophyceae and the scarce Dinophyceae showed no clear seasonal distribution pattern. The implications of alternating procaryotic and eucaryote dominated algal communities for the Red Sea pelagic food web are discussed.

show abstract

Expansion and homogeneity of the vertical distribution of zooplankton in a very deep mixed layer

Cited by 36 publications

References 32 publications

Sea-water seasonal changes at a heavy tourism investment site on the Jordanian northern coast of the Gulf of Aqaba, Red Sea

Sea-water seasonal changes at a heavy tourism investment site on the Jordanian northern coast of the Gulf of Aqaba, Red Sea

Zooplankton May Serve as Transmission Vectors for Viruses Infecting Algal Blooms in the Ocean

Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea

Contact Info

Product

Resources

About