Effects of hydrostatic pressure on metabolic rates of six species of deep‐sea gelatinous zooplankton

Childress, James J.; Thuesen, Erik V.

doi:10.4319/lo.1993.38.3.0665

Cited by 37 publications

(22 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Clearly, this is an area in need of further investigation. Our results showing that the respiration rates of megacalanid copepods are relatively unaffected by hydrostatic pressure agrees with the established paradigm that respiration rates of midwater animals show little, if any, change in metabolic rates when measured within, or somewhat outside, the range of pressures experienced in their natural environment (Childress & Thuesen 1993).…”

Section: Oxygen Consumption Ratessupporting

confidence: 78%

“…However, the metabolic rates of chaetognaths and medusae are independent of depth of occurrence (Thuesen & Childress 1993. Do the metabolic rates of copepods decline with increasing depth of occurrence?…”

Section: Comparisons With Other Pelagic Organismsmentioning

confidence: 99%

“…Background respiration was always undetectable at 1.5 and 5°C. Some experiments were carried out at a hydrostatic pressure of 101 atm following methods previously described (Childress & Thuesen 1993 Berges et al 1993, Thuesen & Childress 1993a, b, 1994.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ecophysiological interpretation of oxygen consumption rates and enzymatic activities of deep-sea copepods

Thuesen¹,

Miller²,

Childress³

1998

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

ABSTRACT. We measured oxygen consumption rates, the activities of citrate synthase (CS) and lactate dehydrogenase (LDH) and protein contents for over 30 species of deep-sea pelagic Copepoda. The lowest oxygen consumption rates were measured in Euaugaptilus magnus and the highest rates were measured In Paraeuchaeta tonsa. Welght-specific oxygen consumption rates declined significantly with increasing size of the organism. None of the biochemical parameters were particularly good predictors of metabolic rate. Although linear regressions of LDH activity and protein content against oxygen consumption were statistically significant, R2 values for the relationships were very low. CS activity was not significantly correlated with metabolic rate. The highest CS activities were measured in Pleurontarnrna abdominalis and Calanus pacificus, which were the 2 smallest and shallowest-living species in our investigation. The lowest CS activities were measured in Euaugaptilus antarcticus and Pach}~ptilus pacificus. Disseta scopularis had the highest LDH activities and Onchocalanus rnagnus had the lowest LDH activities. Over all specimens, there were statistically signlf~cant increases in welght-specific activities of CS and LDH as a function of body mass. There was much greater variation in glycolyt~c potential as indicated by LDH activity than in CS activities. Epipelagic copepods apparently rely less on glycolytic energy sources than do mesopelagic and bathypelagic copepods. Higher LDH activities of larger Copepoda may indicate a greater dependence on LDH for burst swimming in large species compared with smaller ones or a reliance on glycolytic abilit~es for sustained swimming during vertical migrations. Our enzyme data do not support the suggestion that high LDH activities are adaptations to the very low oxygen concentrations found in the oxygen minimum layer. Enzymatic ratios were used to lntel-pret lifestyle, and deep-sea copepods fell into 3 metabohc groups, 'muscular sinkers', 'thinmuscled floaters' and 'giants', that were related to morphological pattern and behaviour. The effect of hydrostatic pressure on the metabolic rate of an undescribed, but very common, species of Megacalanus was investigated and found to be non-significant. Copepods do not display the depth-related decl~nes in metabolic rates that are found in shnmps, fishes and cephalopods.

show abstract

Section: Oxygen Consumption Ratessupporting

confidence: 78%

Section: Comparisons With Other Pelagic Organismsmentioning

confidence: 99%

See 1 more Smart Citation

Ecophysiological interpretation of oxygen consumption rates and enzymatic activities of deep-sea copepods

Thuesen¹,

Miller²,

Childress³

1998

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…To describe a generic case of larval dispersal processes, we use B 0 = 3.17, which describes the population mean PLD as a default case (35), and B 0 = 10.0 for a longer PLD case (twice the mean). We assumed that metabolic rates of vent animals are relatively insensitive to hydrostatic pressure (45).…”

Section: Methodsmentioning

confidence: 99%

Quantifying dispersal from hydrothermal vent fields in the western Pacific Ocean

Mitarai

Watanabe

Nakajima

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

105

150

View full text Add to dashboard Cite

Hydrothermal vent fields in the western Pacific Ocean are mostly distributed along spreading centers in submarine basins behind convergent plate boundaries. Larval dispersal resulting from deep-ocean circulations is one of the major factors influencing gene flow, diversity, and distributions of vent animals. By combining a biophysical model and deep-profiling float experiments, we quantify potential larval dispersal of vent species via ocean circulation in the western Pacific Ocean. We demonstrate that vent fields within back-arc basins could be well connected without particular directionality, whereas basin-to-basin dispersal is expected to occur infrequently, once in tens to hundreds of thousands of years, with clear dispersal barriers and directionality associated with ocean currents. The southwest Pacific vent complex, spanning more than 4,000 km, may be connected by the South Equatorial Current for species with a longer-than-average larval development time. Depending on larval dispersal depth, a strong western boundary current, the Kuroshio Current, could bridge vent fields from the Okinawa Trough to the Izu-Bonin Arc, which are 1,200 km apart. Outcomes of this study should help marine ecologists estimate gene flow among vent populations and design optimal marine conservation plans to protect one of the most unusual ecosystems on Earth.

show abstract

“…Los modelos teóricos de talla óptima formulados por Sebens (1982;1987), basados en experimentación con anémonas, predicen un decrecimiento del tamaño de los invertebrados marinos con la profundidad, debido a la disminución de alimento hacia zonas profundas del océano (Sanders & Hessler, 1969;Parsons, Takahashi, & Hargrave, 1977;Hoey, Degraer, & Vincx, 2004). Contrario a dichos modelos, otros autores (Peters, 1983;Mahaut, Sibuet, & Shirayama, 1995;Rex & Etter, 1998;Rex, Etter, Clain, & Hill, 1999, Berkenbusch, Probert, & Nodder, 2011 sugieren que la menor disponibilidad de alimento con la profundidad, pueden favorecer tamaños grandes, ya que organismos de mayor talla son metabólicamen-te más eficientes por unidad de masa (Childress & Thuesen, 1993;Olabarria & Thurson, 2003;Rex et al, 2006).…”

unclassified

Variaciones adaptativas en la talla de la megafauna bentónica de fondos blandos tropicales en función de parámetros bióticos y abióticos

Gómez

García

2017

RBT

View full text Add to dashboard Cite

Understanding and predicting adaptations in body size of megabenthic invertebrates remains a major challenge in marine macroecology. This study was conducted in order to investigate size variations of benthic megafauna in the tropics and to identify the effect of biotic and abiotic factors that may produce changes to these organisms, testing unresolved hypothesis and paradigms of deep sea ecology from subtropical and temperate areas. The study area covered the continental shelf of the Colombian Caribbean. The samples were collected during 1998, 2001 and 2005, using semi-globe demersal net for a water depth of 10 to 500 m. The most common species were selected for further study: Eudolium crosseanum, Cosmioconcha nitens, Nuculana acuta (mollusks), Astropecten alligator, Brissopsis atlantica, B. elongata (equinoderms), Anasimus latus, Chasmocarcinus cylindricus and Achelous spinicarpus (crustaceans). Generalized Additive Models were used to detect significant changes in size and to infer the effects of biotic and environmental factors on organisms’ size. The dependent variable was size and the predicting model variables were depth, temperature, intraspecific density, interspecific density, richness, latitude, and longitude. A total of 7 000 individuals were measured. Six species showed an increase in body size towards deeper and colder sites. These species inhabit shallow and deep environments that exceed a variation in temperature of 10 °C. There was a remarkable size reduction in areas affected by the Magdalena River, possibly due to major physicochemical changes caused by the river. This region has the lowest planktonic primary productivity within the study area. An increase in sizes was observed north of the Magdalena River (long 74°W - 71°W & lat of 11°N - 13°N), which may be attributable to the coastal upwelling occurring in this part of Colombia. The relationship between the density of benthic organisms and size was not clear. However, five species showed an inverse relation with intraspecific density and three with interspecific density. Temperature and depth were the variables that best explained the variations in size. Most of the studied species showed an increase in body size when temperature dropped along the bathymetric range. The trend of increasing size in deeper zones is contrary to the prediction of the optimal size theoretical model (but consistent with recent studies), which indicates a reduction in organisms’ size in the deep sea, due to food limitation with increasing depth. It is possible that this increase in size is an adaptation to maximize energy, which is frequently observed in the coldest habitats of several species. Future studies in Caribbean should examine variations in size of benthic megafauna towards deeper zones (more than 500 m), were temperature is less variable and then other factors can play a more important role determining the size of these organisms.

show abstract

Effects of hydrostatic pressure on metabolic rates of six species of deep‐sea gelatinous zooplankton

Cited by 37 publications

References 6 publications

Ecophysiological interpretation of oxygen consumption rates and enzymatic activities of deep-sea copepods

Ecophysiological interpretation of oxygen consumption rates and enzymatic activities of deep-sea copepods

Quantifying dispersal from hydrothermal vent fields in the western Pacific Ocean

Variaciones adaptativas en la talla de la megafauna bentónica de fondos blandos tropicales en función de parámetros bióticos y abióticos

Contact Info

Product

Resources

About