Role of the free amino acid pool of the copepod Acartia tonsa in adjustment to salinity change

Farmer, Linda L.; Reeve, M. R.

doi:10.1007/bf00391634

Cited by 39 publications

(20 citation statements)

References 9 publications

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“…In conjunction with this, significant changes in ammonia excretion rate were observed in crustaceans (Needham, 1957;Haberfield et al, 1975;Mangum et al, 1976;Farmer and Reeve, 1978;Armstrong et al, 1981;Pressley et al, 1981;Spaargaren et al, 1982). However, the salinity effect on nitrogen excretion was dependent on the species and its osmoregulatory abilities.…”

Section: Introductionmentioning

confidence: 97%

Salinity-induced changes in ammonia excretion rate of the shrimp Crangon crangon over a winter tidal cycle

Regnault¹

1984

Mar. Ecol. Prog. Ser.

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Salinity-induced changes in ammonia excretionas salinity drops from 34 %O to 14 %o, and is reduced to '1% during flood tide as the salinity returns to 34 %. The excretory response of C. crangon is influenced by at least 3 factors: direction of salinity change, salinity range over which the change occurred, and the velocity of this change. The effects of salinity fluctuations on the ammonia excretion rate of C. crangon are discussed in relation to the osmoregulatory mechanisms involved in the shrimp's adaptation to changing salinity. The excretory response of C. crangon to a winter tidal cycle is compared to that previously observed under summer conditions. The winter response is characterized by a much larger amplitude and a delay in adaptation. This last point is discussed in relation to the size of shrimp and the experimental temperature, both fitted to winter conditions. Total ammonia production over a 12 h tidal cycle was 167.53 k 3.47 pg N g 1 wet wt in shrimp undergoing tidal cycles, and 95.40 Â 9.83 pg N in shrimp maintained at a constant salinity (34 %o). Consequently, shrimp in estuarine conditions face a noticeable nitrogen loss compared to shrimp staying offshore. As opposed to summer conditions where the loss was negligible, some behavioural changes (migration, burrowing) are necessary for shrimp in order to survive winter estuarine conditions without damage.

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Section: Introductionmentioning

confidence: 97%

Salinity-induced changes in ammonia excretion rate of the shrimp Crangon crangon over a winter tidal cycle

Regnault¹

1984

Mar. Ecol. Prog. Ser.

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“…Thus, females apparently stayed in a temperature window optimal for egg production at low food conditions during summer. Instantaneous changes in salinity are also known to negatively affect egg production, development and survival of brackish and marine copepods (Cervetto et al 1999, Lee & Petersen 2003, Calliari et al 2008, Devreker et al 2009), presumably because the up-or down-regulation of the osmotic potential following a hyper-or hypo-osmotic shock is energetically expensive (Farmer & Reeve 1978, Goolish & Burton 1989. This can be substantially amplified by increasing temperature (Gaudy et al 2000).…”

Section: Factors Controlling Egg Productionmentioning

confidence: 99%

“…Copepods adjust their bodily free amino acid and ionic concentrations upon osmotic stress, which can be energetically costly under a fluctuating or sub-optimal salinity (Farmer & Reeve 1978, Goolish & Burton 1989. Accordingly, in a recent study with cultures of Temora longicornis, a decrease in egg production with decreasing salinity (26 to 8) was attributed to the costs of ionic regulation (Holste et al 2009).…”

Section: Salinitymentioning

confidence: 99%

Section: Salinitymentioning

confidence: 99%

“…This can be substantially amplified by increasing temperature (Gaudy et al 2000). In contrast, maintenance costs for osmoregulation under uniform conditions are low (Farmer & Reeve 1978, Goolish & Burton 1989, Calliari et al 2006) and could explain the habitat preference of females for the brackish water layer. 61 Mar Ecol Prog Ser 462: 51-66, 2012 Female size, temperature and food Female size, temperature and food concentration, although not always simultaneously measured, have been identified as the major variables determining the seasonal variation in egg production of pelagic copepods, including Temora longicornis (e.g.…”

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Seasonal dynamics of fecundity and recruitment of Temora longicornis in the Baltic Sea

Dutz¹,

Beusekom²,

Hinrichs³

2012

Mar. Ecol. Prog. Ser.

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The seasonal cycle of reproduction in Temora longicornis was investigated in the Bornholm Basin, Baltic Sea, from March 2002 to May 2003. Variations in egg production of the population (EPR) and spawning females (sfEPR, ~clutch size), proportion of spawning females (%FS), egg hatching success (HS), female prosome length (PL) and weight-specific egg production (spEPR) were compared with the seasonal variations in temperature, salinity, and food concentration and composition. Females reproduced year round with maxima of 9.8 to 12.3 eggs female −1 d −1 in spring and low to moderate egg production during the remaining seasons. PL was maximal during spring, and %FS, sfEPR and spEPR paralleled egg production. HS was low during winter and increased in spring. The statistical analyses showed that mean egg production correlated with both sfEPR and %FS. While %FS was significantly related to food concentration, sfEPR was dependent on both food availability and PL, which in turn was inversely related to temperature. Salinity had no effect on the seasonal variation in egg production because females maintained their vertical position in water with low seasonal amplitudes in salinity and temperature, presumably to avoid high energetic costs due to osmoregulation under fluctuating salinity. Nevertheless, the costs due to osmoregulation during development likely resulted in small female PL, and thus indirectly affected reproduction. Using empirical non-linear regression, 80% of the seasonal variation in egg production of T. longicornis was explained by female length and food concen tration. However, despite the pronounced seasonal variation in egg production, the recruitment of nauplii was continuously high except throughout the productive season, indicating that a low reproductive success was offset by female abundance.KEY WORDS: Fecundity · Hatching success · Temora longicornis · Baltic Sea · Food · Temperature · Body mass Resale or republication not permitted without written consent of the publisher1991, Kiørboe & Nielsen 1994), food quality in terms of mineral or biochemical composition (Jónasdóttir et al. 1995, Peters et al. 2007 or presence of noxious species (Van Rijswijk et al. 1989, Devreker et al. 2005 and suspended sediments (Castellani & Altunbaş 2006). In contrast, the variation in egg viability and egg hatching success is largely related to maternal effects such as female nutrition or resting egg production (Castellani & Lucas 2003, Paffenhöfer et al. 2005.While the variables determining egg production and egg viability are generally well understood, our knowledge on the control of reproduction and recruitment of a species in specific environments is incomplete. Temperate copepod species often display a wide geographical distribution, and the relative importance of the variables controlling reproductive success and recruitment likely differ over the distribution range, depending on regional conditions. This information is pivotal for understanding the effect of climate variability and change on copepod r...

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Do osmoregulators have lower capacity of muscle water regulation than osmoconformers? A study on decapod crustaceans

et al. 2010

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Decapod crustaceans occupy various aquatic habitats. In freshwater they are osmoregulators, while marine species are typically osmoconformers. Freshwater crustaceans are derived from marine ancestors. The hypothesis tested here was that osmoregulators, which can rely on salt transport by interface epithelia to prevent extracellular disturbance, would have a lower capacity of tissue water regulation when compared with osmoconformers. Four species of decapod crustaceans (the marine osmoconformer crab Hepatus pudibundus, and three osmoregulators of different habitats) have been exposed in vivo to a salinity challenge, for up to 24 hr. Osmoregulators were: the estuarine shrimp Palaemon pandaliformis, the diadromous freshwater shrimp Macrobrachium acanthurus, and the hololimnetic red crab Dilocarcinus pagei. H. pudibundus displayed hemolymph dilution already after 0.5 hr in 25 per thousand, reaching approximately 30% reduction in osmolality, but its muscle degree of hydration did not increase. To make the different in vivo salinity challenges directly comparable, the ratio between the maximum change in muscle hydration with respect to the control value measured for the species and the maximum change in hemolymph osmolality was calculated (x 1,000): H. pudibundus (25 per thousand, 8.1% kg H(2)O/mOsm x 10(3))>P. pandaliformis (2 per thousand, 9.2)>M. acanthurus (30 per thousand, 12.6)>P. pandaliformis (35 per thousand, 16.7)>D. pagei (7 per thousand, 60.4). Muscle slices submitted in vitro to a 30% osmotic challenge confirmed in vivo results. Thus, the estuarine/freshwater osmoregulators displayed a lower capacity to hold muscle tissue water than the marine osmoconformer, despite undergoing narrower variations in hemolymph osmolality.

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Role of the free amino acid pool of the copepod Acartia tonsa in adjustment to salinity change

Cited by 39 publications

References 9 publications

Salinity-induced changes in ammonia excretion rate of the shrimp Crangon crangon over a winter tidal cycle

Salinity-induced changes in ammonia excretion rate of the shrimp Crangon crangon over a winter tidal cycle

Seasonal dynamics of fecundity and recruitment of Temora longicornis in the Baltic Sea

Do osmoregulators have lower capacity of muscle water regulation than osmoconformers? A study on decapod crustaceans

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