Patterns of distribution of sound‐scattering zooplankton in warm‐ and cold‐core eddies in the Gulf of Mexico, from a narrowband acoustic Doppler current profiler survey

Zimmerman, Robert A.; Biggs, Douglas C.

doi:10.1029/1998jc900072

Cited by 55 publications

(45 citation statements)

References 23 publications

(5 reference statements)

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“…As a consequence, the new primary production (based on the vertical diffusive flux of NN through the pycnocline) would also be higher in CG than in the AG. This higher new primary production could thus be a factor contributing to the observed enhanced [CHL] and biomass in cyclones, as already suggested by previous studies (Biggs et al, 1988;Biggs, 1992;Biggs and Müller-Karger, 1994;Yoder and Mahood, 1983;Zimmerman and Biggs, 1999), although it is difficult to assess with our database. Regenerated production, local regeneration (Belabbassi et al, 2005), and grazing (Banse, 1995) may also have a fundamental influence, but the answer to this question requires other measurements that are not at our disposal (e.g., oxygen).…”

Section: Nutrient Vertical Distribution In Cyclones and Anticyclonesmentioning

confidence: 53%

Temporal variability of chlorophyll distribution in the Gulf of Mexico: bio-optical data from profiling floats

et al. 2017

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Abstract. Chlorophyll concentration is a key oceanic biogeochemical variable. In the Gulf of Mexico (GOM), its distribution, which is mainly obtained from satellite surface observations and scarce in situ experiments, is still poorly understood. In 2011-2012, eight profiling floats equipped with biogeochemical sensors were deployed for the first time in the GOM and generated an unprecedented dataset that significantly increased the number of chlorophyll vertical distribution measurements in the region. The analysis of these data, once calibrated, permits us to reconsider the spatial and temporal variability of the chlorophyll concentration in the water column. At a seasonal scale, results confirm the surface signal seen by satellites, presenting maximum concentrations in winter and low values in summer. It is shown that the deepening of the mixed layer is the primary factor triggering the chlorophyll surface increase in winter. In the GOM, a possible interpretation is that this surface increase corresponds to a biomass increase. However, the present dataset suggests that the basin-scale climatological surface increase in chlorophyll content results from a vertical redistribution of subsurface chlorophyll and/or photoacclimation processes, rather than a net increase of biomass. One plausible explanation for this is the decoupling between the mixed-layer depth and the deep nutrient reservoir since mixed-layer depth only reaches the nitracline in sporadic events in the observations. Float measurements also provide evidence that the depth and the magnitude of the deep chlorophyll maximum is strongly controlled by the mesoscale variability, with higher chlorophyll biomass generally observed in cyclones rather than anticyclones.

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Section: Nutrient Vertical Distribution In Cyclones and Anticyclonesmentioning

confidence: 53%

Temporal variability of chlorophyll distribution in the Gulf of Mexico: bio-optical data from profiling floats

et al. 2017

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“…Like other Scyphozoa, the medusa stage of P. punctata can live for many months (Garcia 1990, Garcia & Durbin 1993, Graham et al 2003a). Starvation during transport on the order of 2 mo is not expected to occur, since eddies can be viewed as 'oases' of planktonic productivity, especially along their fringes (Zimmerman & Biggs 1999, Biggs & Ressler 2001. Simple point-wise back-tracing with model currents from locations on the shelf from 31 May to 1 April 2000, showed several successful pathways back to the LC.…”

Section: Discussionmentioning

confidence: 99%

“…The LC emerges from the Yucatan Strait carrying a suite of larval fishes (Futch 1977, Zimmerman & Biggs 1999, zooplankton (Zimmerman & Biggs 1999, Biggs & Ressler 2001, Gasca et al 2001, sea grasses (McMillan & Phillips 1979) and macroalgae [e.g. Sargassum spp.…”

Section: Discussionmentioning

confidence: 99%

Using nowcast model currents to explore transport of non-indigenous jellyfish into the Gulf of Mexico

Johnson

Perry²,

Graham³

2005

Mar. Ecol. Prog. Ser.

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In the spring of 2000, millions of the non-endemic jellyfish Phyllorhiza punctata were found in coastal regions of the Mississippi Bight in the northern Gulf of Mexico. The aggregations were large enough to seriously impact local fisheries by clogging shrimp nets and damaging gear. More importantly perhaps, the impact on plankton biomass and hence on fishery resources were potentially large, since P. punctata is a voracious filter feeder. In this study, we examine a hypothesis for their sudden appearance which involves advection from the Caribbean in an intruding Loop Current and subsequent flux onto the Mississippi Shelf through eddy-shedding processes which interact with the continental shelf/slope. Surface current data were obtained from an archived finite difference model of the Gulf of Mexico which used altimeter data assimilation and real wind forcing covering the time of the invasion. Model and satellite data showed that an exchange event occurred in late April at a time appropriate for the invasion. The results from tracing transport pathways suggest that mass redistribution of Caribbean populations into the northern Gulf of Mexico can be accomplished via Loop Current intrusion and flux of deep basin water onto the shelf. As such, the occurrence of the invasive species P. punctata in the northern Gulf in 2000 can be explained by a natural, but not necessarily common, sequence of events. This hypothesis is discussed as a means of redistribution of a species by invasion as opposed to redistribution by diffusive spreading. KEY WORDS: Gulf of Mexico · Jellyfish · Non-indigenous · Numerical model Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 305: [139][140][141][142][143][144][145][146] 2005 of P. punctata interfered with commercial shrimping along coastal Mississippi and Louisiana and could have been responsible for the unusually low shrimp harvests in 2000 (Graham et al. 2003a).Although Graham et al. (2003a) provided the first published report of the invasion of Phyllorhiza punctata in the Mississippi Bight, there are a number of credible anecdotal reports that smaller aggregations of these medusae had been occurring for several years prior to 2000 along southern Louisiana west of the mouth of the Mississippi River, specifically in Terrebone Bay. While the potential for spreading from this source exists, we must still consider the possibility of periodic introductions of expatriate medusae from a Caribbean source with or without establishment of a population of scyphistomae in the northern GOM. The suddenness and magnitude of the 2000 event suggests that more than local spreading is involved. The purpose of this study was to investigate the possibility that the summer 2000 population of P. punctata medusae could have been transported from the Caribbean into the northern GOM over a relatively short period of time consistent with the biological constraints of these jellyfish (i.e. life-history and survival). This was accomplished by employing a re...

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“…Uplift of isothermal surfaces due to geostrophic balance, such as we observed in the cyclonic eddy in 1998, has been associated with nutrient enrichment and heightened primary productivity in the euphotic zones of other cyclonic eddies (Hay- , Siegel et al 1999. Zooplankton are concentrated in the cold cores of eddies (Schwing et al 1991, Huntley et al 1995, Zimmerman & Biggs 1999, Kimura et al 2000, and high densities of larval fish have been associated with the zooplankton concentrations (Kimura et al 2000). In a cyclonic eddy off central California, euphausiids and copepods were found to be concentrated in the fluorescence maxima at the pycnocline (Huntley et al 2000).…”

Section: Cyclonic Eddies and Fish Abundancementioning

confidence: 99%

Patterns of coastal eddy circulation and abundance of pelagic juvenile fish in the Santa Barbara Channel, California, USA

Nishimoto¹,

Washburn²

2002

Mar. Ecol. Prog. Ser.

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Annual midwater trawling surveys (sampling at depths of 20 to 40 m) in early summer 1998 and 1999 revealed strong interannual variability in the patterns of abundance of late-stage larval and juvenile fishes in the Santa Barbara Channel. In June 1998, sampling revealed high concentrations of fishes in the center of a cyclonic eddy in the western Channel corresponding to the lowest dynamic height in the study area. In contrast, eddy circulation was not consistent during the second survey in June 1999, and high concentrations of fishes were not observed. Patterns of evolving surface currents, observed by high frequency radar and concurrent CTD sampling during the trawling surveys, suggest that interannual variability in fish abundance within the Santa Barbara Channel resulted from local retention in 1998, but not in 1999. Time series of relative vorticity (a measure of eddy rotation) computed from surface current fields indicates that the cyclonic eddy observed during the 1998 survey was a stable, persistent feature developing about 6 wk before the trawling surveys. We speculate that the closed circulation of the eddy in 1998 retained larval and juvenile fishes from about late April until late June. In 1999, trains of smaller eddies propagated across the region beginning in mid-May, lasting through the survey period. Given their size and circulation strength, the propagating eddies probably disrupted the closed circulation in the western Channel. These observations indicate a strong link between coastal mesoscale flows and spatial abundance patterns of juvenile and late-stage larval fishes.

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Patterns of distribution of sound‐scattering zooplankton in warm‐ and cold‐core eddies in the Gulf of Mexico, from a narrowband acoustic Doppler current profiler survey

Cited by 55 publications

References 23 publications

Temporal variability of chlorophyll distribution in the Gulf of Mexico: bio-optical data from profiling floats

Temporal variability of chlorophyll distribution in the Gulf of Mexico: bio-optical data from profiling floats

Using nowcast model currents to explore transport of non-indigenous jellyfish into the Gulf of Mexico

Patterns of coastal eddy circulation and abundance of pelagic juvenile fish in the Santa Barbara Channel, California, USA

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