Lagrangian Observations of the Circulation in the Northern Gulf of California

Lavín, Miguel F.; Durazo, Reginaldo; Palacios, Eduardo; Argote, María Luisa; Carrillo, Laura

doi:10.1175/1520-0485(1997)027<2298:lootci>2.0.co;2

Cited by 75 publications

(89 citation statements)

References 11 publications

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“…Thus, the only published barriers with potential to influence H. ingens include geographic distance coupled with low dispersal ability (Craig et al 2006;Riginos and Nachman 2001), and contemporary oceanographic barriers (Bernardi et al 2003;Selkoe et al 2007;Terry et al 2000). These potential oceanographic barriers are caused by the formation of two gyres in the upper and central GOC regions (AlvarezBorrego 2002;Beier 1997;Lavin et al 1997), a persistent oceanic front in the cape of Baja region, formed by the convergence of the California Current Water, Tropical Surface Water, and the GOC Water (Castro et al 2006), and inflow of surface waters during summer months (Lavin and Marinone 2003). Despite the existence of these potential barriers, a study of gastropod distribution data shows that the majority of gastropods found in the region are unaffected by a barrier at the mouth of the GOC (Simison 2006).…”

Section: Introductionsupporting

confidence: 80%

“…Site fidelity is typical in adult seahorses . Potential juvenile dispersal barriers include the formation of two gyres in the upper and central GOC regions (Alvarez-Borrego 2002;Beier 1997;Lavin et al 1997), a persistent oceanic front where the California Current Water, Tropical Surface Water, and the Gulf of California Waters converge (Castro et al 2006), and inflow of surface waters during summer months (Lavin and Marinone 2003). The patterns of gyre formation, positioning of the oceanic front, and patterns of inflow and outflow are heavily influence by inter-annual variability caused by El Niño (Lavin and Marinone 2003;Castro et al 2000).…”

Section: Demographic Historymentioning

confidence: 99%

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Genetic differentiation across eastern Pacific oceanographic barriers in the threatened seahorse Hippocampus ingens

2010

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Understanding the population structure and evolutionary history of the eastern Pacific seahorse Hippocampus ingens is critical for the effective management of this threatened species. Life history characteristics of H. ingens (site fidelity and brooding of young) may limit gene flow and lead to population differentiation. A recent study analyzing conserved fragments of the mitochondrial cyt b and control region found no population structure. We re-assess this conclusion with a phylogeographic analysis of relationships among 115 individuals of H. ingens over a broader geographic range (San Diego Bay in California, Gulf of California, Central America, Ecuador, and Peru) based on a more variable 428 base pair fragment of the control region. This expanded analysis affirms low overall nucleotide diversity relative to other seahorses (h p = 0.004), and shows evidence of a recent bottleneck and population expansion since the middle Pleistocene. AMOVA analysis shows moderate overall population structure (U ST = 0.10, P val = 0.00), and pairwise U ST estimates indicate structure between the Gulf of California and all Pacific coast localities. Knowledge of population structure in H. ingens may improve conservation efforts by identifying evolutionarily important management units, and could determine source regions in the continuing trade of seahorses for traditional Chinese medicine. The level of genetic divergence observed between the Gulf of California and all other localities sampled may distinguish the Gulf as a separate management unit. Additional phylogeographic research with more quickly evolving genetic markers and targeted sampling at the mouth of the Gulf of California is warranted to inform strategies for conservation of this threatened seahorse.

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Section: Introductionsupporting

confidence: 80%

Section: Demographic Historymentioning

confidence: 99%

Genetic differentiation across eastern Pacific oceanographic barriers in the threatened seahorse Hippocampus ingens

2010

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“…Direct evidence for this pattern was obtained from satellite-tracked drifters by Lavín et al (1997a) and from current meter data by Palacios-Hernández et al (2002). The corresponding hydrographic sections show that in summer the strong stratification is characterized by doming isolines, which leads to a low center in dynamic height and cyclonic geostrophic currents with surface speed comparable to that of the drifters, while in winter stratification is much weaker and the isolines are depressed in the center of the basin, which generates a high in dynamic topography.…”

Section: Thermodynamicsmentioning

confidence: 66%

An Overview of the Physical Oceanography of the Gulf of California

Lavín¹,

Marinone²

2003

Nonlinear Processes in Geophysical Fluid Dynamics

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167

149

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Abstract. The Gulf of California (GC) presents several oceanographic features that make it unique among semienclosed seas of similar latitude and dimensions, the most important being strong tidal mixing, some of it close to deep stratification. Three-dimensional numerical model results suggest that tidal mixing may be more important than the thermohaline circulation in causing the long-term residual circulation, which consists of outflow in the upper 200 m and inflow below, plus a seasonally-reversing surface layer. The GC is an evaporative basin, but in the mean it gains heat through the surface. Lacking a sill at the point of connection with the Pacific Ocean (PO), the GC is constantly shaken by a wide spectrum of signals coming from the PO, including tides, subinertial trapped waves of various frequencies and El Niño. The seasonal dynamics and thermodynamics of the GC are dominated by the PO, not by local wind or buoyancy flux. Local processes are important at shorter time scales and in altering the thermohaline characteristics of the upper-layer waters. Tidal currents generate internal tides, packets of solitons, and sea surface temperature fronts from which jets may form. Coastal upwelling also seems to generate jets that separate from capes, especially on the mainland coast. The mesoscale off-shore circulation in the GC consists of a series of basin-wide geostrophic gyres that reach below 1000 m; their effect on the mean and seasonal circulation and thermodynamics of the GC remains to be studied. During summer, the currents in the mainland continental shelf are due to coastal trapped waves, while during winter they are wind-driven. The most important interannual anomalies in the GC are due to El Niño.

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“…The best-known feature of the circulation in the GC is the large-scale seasonally reversing gyre in the northern gulf, documented by Lavín et al (1997) with satellite tracked drifters, by Carrillo et al (2002) from geostrophic calculations, and by Palacios-Hernández et al (2002) with current meters.…”

Section: Introductionmentioning

confidence: 99%

“…The study is limited to the use of the horizontal velocity components. The vertical velocity component is not used and, therefore, the results do not represent the real advective path of fluid parcels, but that of drifters tied to a specific depth, like those reported by Lavín et al (1997). The results help us understand the behavior of the drifters and to "test" the model outputs by comparing them to observations.…”

Section: Introductionmentioning

confidence: 99%