Evidence for hyporegulation in the calanoid copepod, Acartia tonsa

Farmer, Linda L.

doi:10.1016/0300-9629(80)90043-2

Cited by 20 publications

(3 citation statements)

References 11 publications

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“…Lindquist & Fitzgerald (1976) showed that in the terrestrial isopod Porcellio scaber, the gut fluid acts as a buffer between the hemolymph and the external environment, such that water is withdrawn from the gut lumen on desiccation. Farmer (1980) found that the copepod Acartia tonsa regulates a lower hemolymph Na+ level in hypersaline media. Under these conditions, the cope pod increases its drinking rate, which is amiloride-sensitive, indicating that water loss in hyporegulation is replaced by Na~-dependent fluid absorption by the gut.…”

Section: Ion and Water Transport In Crustacean Gutmentioning

confidence: 99%

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun

Chu¹

1984

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Section: Ion and Water Transport In Crustacean Gutmentioning

confidence: 99%

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun

Chu¹

1984

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“…There is substantial evidence that most copepods inhabiting these environments do not strictly conform to the external salinity but have osmoregulatory capacities to various degrees. In adult species of all the dominant orders of free living copepods, Calanoida, Cyclopoida and Harpacticoida hypo-and hyperregulation of the internal osmotic pressure and ion balance (Battaglia and Bryan, 1964;Bayly, 1969;Farmer, 1980;Roddie et al, 1984;Mcallen et al, 1998) or body density (Svetlichny and Hubareva, 2014), nonisometric to the external conditions, has been observed, non-isometric to the external conditions.…”

Section: Introductionmentioning

confidence: 99%

Does resource availability influence the vital rates of the tropical copepod Apocyclops royi (Lindberg, 1940) under changing salinities?

Gréve

Jepsen

Hansen

2020

Journal of Plankton Research

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Abstract The physiology of invertebrates inhabiting many coastal ecosystems is challenged by strong temporal fluctuations in salinity. We investigated how food availability influences vital rates in the tropical cyclopoid copepod Apocyclops royi subjected to different salinities (5–32 PSU). We hypothesized that (i) mortality decreases and egg production rate increases with food availability; (ii) under suboptimal salinity, mortality increases and the egg production rate is reduced and (iii) the threshold concentration for egg production (the lowest food concentration where egg production is initiated) shifts to higher food concentrations when challenged by salinity. Surprisingly, A. royi survived, ingested food and produced eggs at all tested salinities. Mortality rate was, however, dependent on salinity level, but not on food availability. Mortality increased (~12% h−1) during short-term (1 h) salinity acclimatization to 5 PSU and during the following 24-h incubations (~5% d−1) compared with higher salinities. Feeding and egg production rates increased with food availability up to an optimum at all salinity levels, with no effect of salinity on the lowest food concentration initiating egg production. This reveals a high-salinity tolerance by A. royi and may partly explain why this particular copepod is so successful compared with its congeners in occupying extreme habitats.

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“…As specific egg production is equal to specific somatic growth and thereby development (according to Berggreen et al ), we anticipate that A. tonsa in the present experiment would have developed faster in lower salinity (15–20 psu). It can be hypothesized that salinities in this range are probably close to the osmolality of adult A. tonsa and they thereby save energy on hyporegulation and instead allocate it to somatic growth/egg production (Farmer ; Svetlichny and Hubareva ).…”

Section: Discussionmentioning

confidence: 99%

Effects of Salinity, Commercial Salts, and Water Type on Cultivation of the Cryptophyte Microalgae Rhodomonas salina and the Calanoid Copepod Acartia tonsa

Jepsen

Thoisen

Carron-Cabaret

et al. 2018

J World Aquaculture Soc

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Marine aquaculture facilities positioned far from the sea need access to seawater (SW); hence, commercial salts are often the chosen solution. In marine hatcheries, most fish larvae require live feed (zooplankton) that are in turn fed with microalgae. The objective of this research was to investigate the applicability of commercial salts and clarify the potential effects on the cultivation of the microalga Rhodomonas salina and the copepod Acartia tonsa. Three commercial salts were tested, Red Sea Salt (RS), Red Sea – Coral Pro Salt (CP), and Blue Treasure Salt. R. salina was cultured at salinities of 10, 20, and 30 psu resulting in equal growth rates at salinities 20 and 30 in SW and RS mixed with deionized (DI) water. The optimum salinity for R. salina was 29 psu. For A. tonsa eggs, we observed highest hatching success in 30 psu with CP or RS mixed with DI water. The egg hatching success was not affected by salinities 15–40 and optimal hatching was obtained at 27 psu. Results confirm it was possible to use commercial salts for rearing of both R. salina and A. tonsa, widening the application of these species for aquaculture facilities without access to SW.

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Evidence for hyporegulation in the calanoid copepod, Acartia tonsa

Cited by 20 publications

References 11 publications

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun

Does resource availability influence the vital rates of the tropical copepod Apocyclops royi (Lindberg, 1940) under changing salinities?

Effects of Salinity, Commercial Salts, and Water Type on Cultivation of the Cryptophyte Microalgae Rhodomonas salina and the Calanoid Copepod Acartia tonsa

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