Life on the Edge: Marine Life and Fronts

Olson, Donald B.; Hitchcock, Gary L.; Mariano, Arthur J.; Ashjian, Carin J.; Peng, Ge; Nero, Redwood W.; Podestá, Guillermo

doi:10.5670/oceanog.1994.03

Cited by 239 publications

(201 citation statements)

References 40 publications

Supporting

Mentioning

186

Contrasting

Unclassified

Order By: Relevance

“…The arrival of these downwelling fronts in Galicia allows oceanic waters to enter the interior of the rias (Á lvarez-Salgado et al, 2000;Crespo et al, 2006). Moreover, zooplankton showed a behaviourally mediated concentration in density fronts, such as downwelling fronts (Olson et al, 1994), where population densities may be up to three times greater than in other waters (Genin et al, 2005). The displacement of the density fronts towards the interior of the rias during downwelling periods may represent an important supply of oceanic zooplankton and a parallel source of V. parahaemolyticus populations attached to the zooplankton.…”

Section: Discussionmentioning

confidence: 99%

“…The association of Vibrio with zooplankton may provide protection from the stresses associated with these cold saline environments and may represent a food source that ensures survival during prolonged journeys (MartinezUrtaza et al, 2008a). Furthermore, owing to the characteristic patchy distribution of zooplankton (Olson et al, 1994;Genin et al, 2005), Vibrio transport mediated by zooplankton may represent a mechanism for the aggregation of Vibrio specimens in the open sea at high densities, an ecological aspect that may be critical for achieving the level of pathogenic organisms required to cause infection (FDA, 2005).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ecological determinants of the occurrence and dynamics of Vibrio parahaemolyticus in offshore areas

et al. 2011

View full text Add to dashboard Cite

The life cycle of Vibrio parahaemolyticus has been conventionally associated with estuarine areas characterized by moderate salinity and warm seawater temperatures. Recent evidence suggests that the distribution and population dynamics of V. parahaemolyticus may be shaped by the existence of an oceanic transport of communities of this organism mediated by zooplankton. To evaluate this possibility, the presence of V. parahaemolyticus in the water column of offshore areas of Galicia was investigated by PCR monthly over an 18-month period. Analysis of zooplankton and seawater showed that the occurrence of V. parahaemolyticus in offshore areas was almost exclusively associated with zooplankton and was present in 80% of the samples. The influence of environmental factors assessed by generalized additive models revealed that the abundance and seasonality of V. parahaemolyticus in zooplankton was favoured by the concurrence of downwelling periods that promoted the zooplankton patchiness. These results confirm that offshore waters may be common habitats for V. parahaemolyticus, including strains with virulent traits. Additionally, genetically related populations were found in offshore zooplankton and in estuaries dispersed along 1500 km. This finding suggests that zooplankton may operate as a vehicle for oceanic dispersal of V. parahaemolyticus populations, connecting distant regions and habitats, and thereby producing impacts on the local community demography and the spread of Vibrio-related diseases.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ecological determinants of the occurrence and dynamics of Vibrio parahaemolyticus in offshore areas

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Pacific leatherback turtles (Dermochelys coriacea) have been hypothesized to travel along 'persistent corridors' using topographic features [27,28], but in the Atlantic no evidence of migratory corridors has been found [29][30][31][32]. Travel adjacent to oceanic fronts has also been hypothesized [33,34]. Additional studies point to a 'multifactor navigation system' in turtles [35] that may include a combination of visual and magnetic cues [36], currents [37] and, possibly, olfactory cues over shorter distances [38,39].…”

Section: Introductionmentioning

confidence: 99%

Orientation behaviour of leatherback sea turtles within the North Atlantic subtropical gyre

2015

View full text Add to dashboard Cite

Leatherback sea turtles (Dermochelys coriacea) travel thousands of kilometres between temperate feeding and tropical breeding/over-wintering grounds, with adult turtles able to pinpoint specific nesting beaches after multi-year absences. Their extensive migrations often occur in oceanic habitat where limited known sensory information is available to aid in orientation. Here, we examined the migratory orientation of adult male, adult female and subadult leatherbacks during their open-ocean movements within the North Atlantic subtropical gyre by analysing satellite-derived tracks from fifteen individuals over a 2-year period. To determine the turtles' true headings, we corrected the reconstructed tracks for current drift and found negligible differences between current-corrected and observed tracks within the gyre. Individual leatherback headings were remarkably consistent throughout the subtropical gyre, with turtles significantly oriented to the south-southeast. Adult leatherbacks of both sexes maintained similar mean headings and showed greater orientation precision overall. The consistent headings maintained by adult and subadult leatherbacks within the gyre suggest use of a common compass sense.

show abstract

“…The high biological productivity of the Uruguayan shelf has been associated with its complex hydrography and the presence of strong temperature and salinity gradients (ORTEGA; MARTÍNEZ, 2007). Fronts are zones of high phytoplankton biomass (LE FÈVRE, 1986;LAUBSHER et al 1993;OLSON et al, 1994;FRONEMAN et al,1997; and also of improved production at higher trophic levels (LARGIER, 1993;MANN;LAZIER, 1996). Moreover, frontal zones have mechanisms that promote larval retention (MUNK et al, 2003; and are used as feeding, spawning, nursery and breeding areas by fish, invertebrate populations and pelagic seabirds (BAKUN;PARRISH, 1991;ACHA et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Delimitation of domains in the external Río de la Plata estuary, involving phytoplanktonic and hydrographic variables

Martínez

Ortega

2015

Braz. j. oceanogr.

View full text Add to dashboard Cite

Autumn and spring hydrological (temperature and salinity) and biological (chlorophyll, phaeopigments and phytoplankton species) variables were analysed. Phytoplankton biomass, expressed as chlorophyll a reach a maximum of 6.1 µg L-1in autumn and 22.8 µg L-1 during spring. Maxima were found in the frontal zone and marine adjacent area. Four domains were identified through multivariate analysis: Riverine, Estuarine, Frontal and Oceanic; mainly due to salinity and depth in autumn and due to salinity and chlorophyll in spring. The Riverine and Oceanic domains (West and East boundaries) matched in location in both seasons, while in spring an additional domain was discerned in the Canal Oriental (Channel domain). Salinity and chlorophyll concentration increased from the Riverine to the Frontal domain, being positively correlated for salinities 14, indicating that chlorophyll concentration was modulated mainly by the oceanic influence that improved light availability. While salinity maintains an increasing trend toward the Oceanic domain, phytoplankton biomass decreases. Though in this zone the chlorophyll concentration must be regulated by a combination of light availability and grazing, further investigation is needed.

show abstract

Life on the Edge: Marine Life and Fronts

Cited by 239 publications

References 40 publications

Ecological determinants of the occurrence and dynamics of Vibrio parahaemolyticus in offshore areas

Ecological determinants of the occurrence and dynamics of Vibrio parahaemolyticus in offshore areas

Orientation behaviour of leatherback sea turtles within the North Atlantic subtropical gyre

Delimitation of domains in the external Río de la Plata estuary, involving phytoplanktonic and hydrographic variables

Contact Info

Product

Resources

About