Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

Criales-Hernández, María I.; Schwamborn, Ralf; Graco, Michelle; Ayón, Patricia; Hirche, Hans-Jürgen; Wolff, Martha Maria

doi:10.1007/s10152-007-0094-3

Cited by 41 publications

(18 citation statements)

References 41 publications

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“…First, H. digitata may be positioned to maximize encounters and capture of copepods and other prey. The habitat depth of H. digitata approximately coincides with a peak in mesopelagic biomass (Saltzman and Wishner 1997a,b;Criales-Hernandez et al 2008) and, specifically, in mesopelagic calanoid copepods (Mauchline 1998). In feeding experiments and observations, omnivorous and carnivorous planktonic foraminifera have been shown to prey predominantly on copepods, in keeping with the copepods' relatively high abundance Caron and Be 1984;Swanberg and Caron 1991), and to prefer calanoid copepods over other copepod taxa (Spindler et al 1984).…”

Section: Discussionmentioning

confidence: 97%

“…While calanoid abundances decrease with water depth, they are generally abundant in the upper 300 m and decrease irregularly to 1000 m (Mauchline 1998). In Monterey Bay, a , 300-m habitat depth likely coincides with a peak in mesopelagic biomass above the oxygen minimum zone (Saltzman and Wishner 1997a,b;Criales-Hernandez et al 2008), a peak in mesopelagic copepod abundance (Childress 1977;Thuesen et al 1998), the diel ambits of vertically migrating copepods (Huntley and Brooks 1982;Hattori 1989), deep ontogenetic or seasonal phases of the dominant epipelagic copepods like Calanus pacificus or Metridia pacifica (Batchelder 1985;Ohman et al 1998;Johnson and Checkley 2004), and the margin between the lower edge of the California Current and the upper extent of the California Undercurrent.…”

Section: Discussionmentioning

confidence: 99%

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Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California

Hull

Osborn

Norris

et al. 2011

Limnology & Oceanography

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We investigated the habitat depth and population dynamics of mesopelagic foraminifera in Monterey Bay, California, using 12 yr of video surveys and specimens from live collections. The water column over Monterey Canyon continuously supports two distinct species of mesopelagic foraminifera, Hastigerinella digitata and a previously unknown species referred to as Hastigerina sp., with H. digitata dominating the planktonic foraminiferal assemblage at mesopelagic depths. H. digitata populations live within a narrow depth horizon that lies above the core of the regional oxygen minimum zone at a depth of 280-358 m and O 2 concentrations of 1-1.3 mL L 21 . Our observations provide a modern calibration for understanding fossil digitate planktonic foraminifera. We observed numerous copepods in various stages of ingestion on the spines of H. digitata and a conspicuous lack of detritus attached to the spine network, providing support for the hypothesis that H. digitata is an obligate carnivore. H. digitata populations did not show the strong two-phase seasonality that characterizes the population dynamics of many mesopelagic species that live above the Monterey Canyon, although H. digitata was generally more abundant in cooler waters on seasonal and interannual timescales.The ecology of midwater organisms-inhabitants of the waters lying below the well-lit surface waters and above the deep seafloor-is poorly known despite the areal extent of their habitat and their long evolutionary history (Robison 2004(Robison , 2009). The lack of information pertaining to the largest ecosystem on Earth (by volume) arises in part from the difficulty of accessing the midwater habitat and limitations of studying communities with trawl nets and acoustics. Trawl nets destroy the delicate organisms that make up a major component of midwater communities and preclude observations of organism interactions in situ. Acoustics generally cannot provide count data or distinguish between individuals and/or species (NRC 2003; Robison 2004). The advent of remotely operated vehicle (ROV) technology provided a needed complement to trawl and acoustic sampling by allowing the direct observation of organismal behavior in nature (Haddock 2007) and by enabling the collection of time series of the relative abundance and depth distribution of taxa (Robison et al. 1998; Robison 2004;Osborn et al. 2007).Here, we investigate the ecology and distribution of mesopelagic planktonic foraminifera in Monterey Bay, California, using 12 yr of effort-standardized, ROV video transect observations and specimens captured in situ with a ROV. We focus on planktonic foraminifera, just one of the many mesopelagic groups quantified within the ROV time series, as they showcase the potential of ROV video transects to provide reliable, in situ observations of even small organisms that were poorly sampled and understood with traditional plankton net sampling. As such, this study provides baseline data on the population dynamics and distribution of mesopelagic foraminifera an...

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California

Hull

Osborn

Norris

et al. 2011

Limnology & Oceanography

View full text Add to dashboard Cite

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“…by Levin & Edesa (1997) and the spionid Paraprionospio pinnata by González & Quiñones (2000). Responses to the physiological constraints of OMZs have also been documented in several species of calanoid copepods via ontogenetic zonation (Wishner et al 2000, Loick et al 2005, Criales-Hernandez et al 2008.…”

Section: Introductionmentioning

confidence: 93%

Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Jeffreys

Levin

Lamont³

et al. 2012

Mar. Ecol. Prog. Ser.

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Oxygen minimum zones (OMZs) are naturally occurring, low-oxygen water masses that create hypoxic conditions where they impinge on the seafloor. Their lower boundaries are characterised by elevated densities of hypoxia-tolerant fauna and an abundant food supply. The polychaete Linopherus sp. nov. (Amphinomidae) is the dominant taxon at the Pakistan margin (PM) lower OMZ, at near suboxic dissolved oxygen (DO) concentrations of 5 to 8 µM. We explored the response of Linopherus sp. nov. to gradients in oxygen and organic matter (OM) availability from depths of 700 to 1100 m during the inter-and late monsoon periods. Linopherus sp. nov. was present from 800 to 1000 m, and highest densities were found at 850 m. Population size structuring was evident and smaller individuals were present at depths of lowest DO concentrations. Linopherus sp. nov. showed morphological adaptation to low DO, and respiratory surface areas were significantly larger in worms at sites of lowest DO concentrations.

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“…The zooplankton distribution throughout the water column displays different patterns of vertical structure for a variety of groups (Criales-Hernández et al 2008). Field and theoretical studies suggested that this heterogeneous use of space can be mainly attributed to physical processes, seasonal, ontogenetic or diel vertical migrations, body size, morphologies, feeding resources, reproductive success, predation risk and/or competitive abilities (Jeffries and Lawton 1984;Fossheim and Primicerio 2008;Marrari et al 2011;Sato et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Vertical segregation of holoplanktonic molluscs in the epipelagic layer, southern Gulf of Mexico

et al. 2012

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The small-scale vertical distribution of five genera of holoplanktonic molluscs inhabiting the upper oceanic layer (0-105 m) was analysed to test whether evident distribution patterns could be attributed to habitat partitioning. Zooplankton samples were taken over neritic waters during the day and night using a 505-lm multiple closing net at five levels (0-6, 6-12, 12-18, 45-55 and 95-105 m) of the water column. Flowmeters were placed in each net to estimate the amount of filtered water. From the 55,654 identifiable specimens of holoplanktonic molluscs, only 6.2 % were in juvenile stage, and Cavolinia, Diacavolinia, Diacria, Oxygyrus and Clio were the most abundant genera. Adults of these genera comprised 3 % of the total abundance. The abundance data were examined using a spatial segregation index, and its significance was tested with null model methods based on Monte Carlo randomizations. Results indicated that adults showed a much more overlapped distribution in the water column than the in the earlier stages. Indeed, juveniles of Cavolinia, Diacavolinia and Oxygyrus were mainly found in the 0-18-m layer, whereas Diacria and Clio were recorded in the 45-105-m stratum. Null model arguments revealed a significant vertical segregation among them. Potential ecological factors involve preferential spawning areas of adults, avoidance of competition for feeding and spatial resources, use of visual capabilities in searching prey, brood protection and avoidance of strong turbulence conditions.

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Zooplankton vertical distribution and migration off Central Peru in relation to the oxygen minimum layer

Cited by 41 publications

References 41 publications

Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California

Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California

Living on the edge: single-species dominance at the Pakistan oxygen minimum zone boundary

Vertical segregation of holoplanktonic molluscs in the epipelagic layer, southern Gulf of Mexico

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