Evidence for hyporegulation in the calanoid copepod, Acartia tonsa

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

“…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 ).…”

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

“…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 ).…”

Invertebrate Endocrinology

“…The sites of water transport in crustaceans are the maxillary gland and antennal (green) gland (843, 1034), the gills (342, 944, 1052), and the gut (7, 372, 944, 1272) (Fig. 16).…”

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

“…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Porcellio scaber, the gut fluid acts as a buffer between the hemolymph and the external environment, such that water is withdrawn from the gut lumen on desiccation.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.…”

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

“…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 ).…”

Invertebrate Endocrinology

“…The sites of water transport in crustaceans are the maxillary gland and antennal (green) gland (843, 1034), the gills (342, 944, 1052), and the gut (7, 372, 944, 1272) (Fig. 16).…”

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

“…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.…”

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

“…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 ).…”

Invertebrate Endocrinology

“…The sites of water transport in crustaceans are the maxillary gland and antennal (green) gland (843, 1034), the gills (342, 944, 1052), and the gut (7, 372, 944, 1272) (Fig. 16).…”

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

“…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.…”