Salt and Water Balance of the Spiny Lobster Panulirus Argus: The Role of the Gut

1977 ◽  
Vol 70 (1) ◽  
pp. 231-245
Author(s):  
D. F. MALLEY
Keyword(s):  
Sea Water ◽  
Spiny Lobster ◽  
The Body ◽  
Digestive Juice ◽  
Urine Production ◽  
Minor Portion ◽  
Salt And Water Balance ◽  
A Minor ◽  
A Site

1. The rate of drinking of sea water averaged 1.5 ± 0.6 ml/kg body weight per 24 h and accounts for only a minor portion of the uptake of water required to balance estimated urine production. 2. Imbibed water and ions, except Ca2+, are absorbed or diffuse across the gut wall into the haemolymph. The gut appears to be a route of net loss of Ca2+, derived from digestive juice and sea water, from the body. 3. The gut does not appear to be a site of regulation of ionic levels in the haemolymph or a major site of water uptake. Note: Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6.

Salt and Water Balance of the Spiny Lobster, Panulirus Argus: The Role of the Antennal Glands

1977 ◽  
Vol 70 (1) ◽  
pp. 221-230
Author(s):  
D. F. MALLEY
Keyword(s):  
Water Balance ◽  
Sea Water ◽  
Spiny Lobster ◽  
Water Levels ◽  
Panulirus Argus ◽  
Antennal Glands ◽  
Salt And Water Balance

1. Panulirus argus in full sea water differs from most other marine isosmotic decapods by regulating Cl− levels in the haemolymph slightly below those in sea water and by having haemolymph K+ levels similar to those in sea water. The species is typical in regulating haemolymph Na+ and Ca2+ above, and Mg2+ and SO42- below, sea-water levels of these ions. Its haemolymph Mg2+ and SO42- concentrations are amongst the lowest reported in marine decapods. 2. The antennal glands contribute to this regulation of Mg2+ SO42- and Cl− by producing urine with markedly, and approximately equally, elevated Mg2+ and SO42- levels, and slightly elevated Cl− levels, compared with those in the haemolymph. The antennal glands show a small tendency to conserve water. Note: Freshwater Institute, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6.

Conclusion

2020 ◽  
pp. 661-670
Author(s):  
David W. Kling
Keyword(s):  
Gender Identity ◽  
Socioeconomic Factors ◽  
Historical Context ◽  
The Body ◽  
The Self ◽  
Crucial Importance ◽  
Divine Presence ◽  
A Site ◽  
Autobiographical Impulse

The concluding chapter provides summary observations of the book’s themes that highlight the complex, multifaceted dimension of conversion throughout twenty centuries of Christian history. These include the convert’s cognizance of divine presence; the crucial importance of historical context (political, religious, institutional, and socioeconomic factors); continuity and discontinuity (how much of the new displaces the old in conversion?); nominal, incomplete, and “true” conversions; personal testimonies and narratives (the autobiographical impulse attests to the converted life); the role of gender; identity and the self; agency (are converts actors or are they being acted upon?); the mechanisms behind and the motivations for conversion; the body as a site of conversion; the role of music; conversion as event and process; coercive practices; and forms of communication in the converting process.

Social Practice, the Bodily Professions and the State

1990 ◽  
Vol 7 (1) ◽  
pp. 72-82 ◽  
Author(s):  
Robert Sparks
Keyword(s):  
Social Practice ◽  
English Language ◽  
The State ◽  
The Body ◽  
Modern State ◽  
Political Struggle ◽  
Sport Sociology ◽  
A Site ◽  
The Relationship

The relationship between sport and the modern state has been a focus of increased theoretical attention in recent years, particularly with respect to the role of sport in hegemony. At the same time there has been mounting interest in the significance of the body and bodily practices (including sports) as a site of political struggle. Yet, not much work has been done on the connection between these two projects. A monograph written in French and published in 1983 draws together many of these themes but has remained neglected in English-language sport sociology. This paper reviews Le corps programmé and discusses some of the book’s theoretical implications.

The Physiology of the Antennal Gland of Carcinus Maenas (L.)

1969 ◽  
Vol 51 (1) ◽  
pp. 11-16
Author(s):  
R. BINNS
Keyword(s):  
Body Weight ◽  
Sea Water ◽  
Carcinus Maenas ◽  
Urine Flow ◽  
The Body ◽  
Antennal Gland ◽  
Urine Production ◽  
The Mean ◽  
Gland Function ◽  
Water Clearance

1. The space measured by inulin distribution, the ‘inulin volume’, has been determined, and represents approximately 20% of the body weight in crabs ranging in size from 20.0 to 57.2 g. 2. After the injection of labelled inulin into crabs, the increase in activity of the medium is equal to the fall in blood inulin in all dilutions of sea water. Clearance of inulin from the blood is due only to urine production, and therefore the molecule can be used for quantitative investigations of antennal gland function. 3. Urine production in various concentrations of sea water has been determined by measuring the clearance of inulin from the blood and the rates at which the tracer appeared in the external media. By these methods the mean rate of urine production in 100% sea water was estimated to be 4.4% body weight per day. In dilute sea water the rate of urine production increases; for example, in 50% sea water the urine flow is four times greater than in normal sea water.

The Relative Losses of Sodium in the Urine and Across the Body surface in the Amphipod, Gammarus Duebeni

1965 ◽  
Vol 42 (1) ◽  
pp. 59-69
Author(s):  
A. P. M. LOCKWOOD
Keyword(s):  
Body Surface ◽  
Sea Water ◽  
Average Rate ◽  
The Body ◽  
High Rate ◽  
Water Turnover ◽  
Urine Production ◽  
Sodium Loss ◽  
And Diffusion ◽  
Total Sodium

1. The relative contributions of urine production and diffusion across the body surface to the loss of sodium from the body of the amphipod Gammarus duebeni have been investigated. 2. When the urine is isotonic to the blood some 80% of the total sodium loss is via the urine. 3. As the gradient between blood and medium is increased in dilute media production of urine hypotonic to the blood counteracts the tendency for sodium loss to increase. 4. In consequence, the average rate of sodium uptake at the body surface by animals acclimatized to 2% sea water needs to be only about twice that of animals acclimatized to 50% sea water. 5. It is suggested that the conservation of ions within the body by the production of hypotonic urine is likely to be found to be a common feature of the smaller brackish water crustacea, especially those with a high rate of water turnover.

Studies on Salt and Water Balance in Caddis Larvae (Trichoptera)

1961 ◽  
Vol 38 (3) ◽  
pp. 501-519 ◽  
Author(s):  
D. W. SUTCLIFFE
Keyword(s):  
Water Balance ◽  
Sea Water ◽  
Salt Water ◽  
Chloride Concentration ◽  
Malpighian Tubule ◽  
Free Water ◽  
The Body ◽  
Chloride Uptake ◽  
Concentrated Solution ◽  
Salt And Water Balance

1. Limnephilus affinis larvae tolerate external salt concentrations up to at least 410 mM./l. NaCl (about 75% sea water) and survive for short periods in 470 mM./l. NaCl (about 85/ sea water). 2. The body wall is highly permeable to water, but relatively impermeable to sodium and chloride. Most of the sodium and chloride uptake from salt water occurs via the mouth. 3. The sodium and chloride levels in the haemolymph are powerfully regulated. Both are maintained strongly hypotonic against large external concentration gradients. 4. The Malpighian tubule-rectal system is very sensitive to changes in the haemolymph chloride level. The chloride concentration in the rectal fluid can be at least three times greater than the concentration in the haemolymph, and slightly greater than the concentration in the external medium. 5. The rectal fluid is hyper-osmotic to the haemolymph and to the medium at high external salt concentrations. 6. At external concentrations greater than about 200 mM./l. NaCl, water balance is maintained by regulating the haemolymph roughly iso-osmotic with the medium. This is partly achieved by increasing the non-electrolyte fraction in the haemolymph. A small quantity of osmotically free water is available to replace any osmotic loss. This can be obtained by drinking salt water and producing a concentrated solution of salts in the rectum.

scholarly journals Destruction, Reconstruction and Resistance: The Skin and the Protean Body in Pedro Almodóvar’s Body Horror The Skin I Live In

Humanities ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 54
Author(s):  
Subarna Mondal
Keyword(s):  
Active Site ◽  
The Body ◽  
The Other ◽  
Human Anatomy ◽  
Surgical Operation ◽  
Mise En Scene ◽  
History Of ◽  
Female Bodies ◽  
A Site

The instinct to tame and preserve and the longing for eternal beauty makes skin a crucial element in the genre of the Body Horror. By applying a gendered reading to the art of destruction and reconstruction of an ephemeral body, this paper explores the significant role of skin that clothes a protean body in Almodóvar’s unconventional Body Horror, “The Skin I Live In” (2011). Helpless vulnerable female bodies stretched on beds and close shots of naked perfect skin of those bodies are a frequent feature in Almodóvar films. Skin stained and blotched in “Tie Me Up! Tie Me Down!” (1989), nurtured and replenished in “Talk to Her” (2002), patched up and stitched in “The Skin I Live In”, becomes a key ingredient in Almodóvar’s films that celebrate the fluidity of human anatomy and sexuality. The article situates “The Skin I Live In” in the filmic continuum of Body Horrors that focus primarily on skin, beginning with Alfred Hitchcock’s “Psycho” (1960), and touching on films like Jonathan Demme’s “The Silence of the Lambs” (1991) and Tom Tykwer’s “Perfume: The Story of a Murderer” (2006) and attempts to understand how the exploited bodies that have been culturally and socially subjugated have shaped the course of the history of Body Horrors in cinema. In “The Skin I Live In” the destruction of Vicente’s body and its recreation into Vera follow a mad scientist’s urge to dominate an unattainable body, but this ghastly assault on the body has the onscreen appearance of a routine surgical operation by an expert cosmetologist in a well-lit, sanitized mise-en-scène, suggesting that the uncanny does not need a dungeon to lurk in. The exploited body on the other hand may be seen not as a passive victim, but as a site of alterity and rebellion. Anatomically a complete opposite of Frankenstein’s Creature, Vicente/Vera’s body, perfect, beautiful but beset with a problematized identity, is etched with the history of conversion, suppression, and the eternal quest for an ephemeral object. Yet it also acts as an active site of resistance.

scholarly journals Salt and Water Balance in the East African Fresh-Water Crab, Potamon Niloticus (M. Edw.)

1959 ◽  
Vol 36 (1) ◽  
pp. 157-176 ◽  
Author(s):  
J. SHAW
Keyword(s):  
Water Balance ◽  
Fresh Water ◽  
Sea Water ◽  
Freezing Point ◽  
Salt Content ◽  
The Body ◽  
Sodium Balance ◽  
East African ◽  
Sodium Loss ◽  
Salt And Water Balance

1. The mechanisms of salt and water balance in the East African fresh-water crab, Potamon niloticus, have been investigated. 2. The freezing-point depression of the blood is equivalent to that of a 271 mM./l. NaCl solution. 3. The animals cannot survive in solutions more concentrated than 75% sea water. Above the normal blood concentration, the blood osmotic pressure follows that of the medium. 4. The urine is iso-osmotic with the blood and is produced at a very slow rate. The potassium content is only half that of the blood. 5. The animal loses sodium at a rate of 8 µM./10 g./hr. mainly through the body surface. Potassium loss occurs at one-sixteenth of this rate. 6. Sodium balance can be maintained at a minimum external concentration of 0.05 mM./l. Potassium requires a concentration of 0.07 mM./l. 7. Active absorption of both sodium and potassium occurs. The rate of uptake of sodium depends on the extent of previous sodium loss. The rate of sodium uptake may be affected by such environmental factors as the salt content of the water, temperature and oxygen tension. 8. The normal oxygen consumption rate is 0.72 mg./10 g./hr. A minimum of 2.3% is used in doing osmotic work to maintain salt balance. 9. The salt and water balance in Potamon is discussed in relation to the adaptation of the Crustacea to fresh water. The importance of permeability changes is stressed.

Water Uptake and Loss in Relation to the Salinity of the Medium in the Amphipod Crustacean Gammarus Duebeni

1973 ◽  
Vol 58 (1) ◽  
pp. 149-163
Author(s):  
A. P. M. LOCKWOOD ◽  
C. B. E. INMAN
Keyword(s):  
Body Surface ◽  
Sea Water ◽  
Tritiated Water ◽  
Prima Facie ◽  
Urine Flow ◽  
The Body ◽  
Osmotic Gradient ◽  
Prima Facie Case ◽  
Urine Production ◽  
Water Saturated

1. The water fluxes across the body surface and the rate of urine production have been studied in the euryhaline amphipod Gammarus duebeni. 2. Urine flow rates (fPOs) have been determined from measurements of loss of [131I]sodium diatrizoate from the body, and the expected urine flow (fPdiff) has been calculated from determinations of the osmotic gradient between blood and medium and the flux of tritiated water. 3. For animals in 2% and 40% sea water the ratio fPOs/fPdiff are 1.16 and 1.44 respectively, and thus approximate fairly closely to unity. This implies that in these media the water subsequently excreted as urine enters the body by osmosis and that there is little interference with the free diffusion of water at the body surface due to passage through long pores or across unstirred layers. 4. In sea water the ratio fPOs/fPdiff is normally (assuming an osmotic gradient of 10 m-osmoles) almost twice unity but urine production is approximately halved when the animals are exposed to sea water saturated with an inhibitor of active sodium uptake (thionine). 5. It is suggested that there is a prima facie case for assuming that part of the fluid subsequently excreted by this species, when in sea water, is taken into the body initially by a process dependent upon active ion transport.

scholarly journals Role of mangrove habitat as a nursery for juvenile spiny lobster, Panulirus argus, in Belize

1997 ◽  
Vol 48 (8) ◽  
pp. 721 ◽  
Author(s):  
Charles A. Acosta ◽  
Mark J. Butler IV
Keyword(s):  
Residence Time ◽  
Deep Water ◽  
Spiny Lobster ◽  
Seagrass Beds ◽  
Mangrove Habitat ◽  
Stony Corals ◽  
Spiny Lobsters ◽  
Population Sizes ◽  
A Site

The use of mangrove prop roots and associated coralline habitats by Caribbean spiny lobsters was investigated near two types of mangrove islands in Belize. Spiny lobsters sheltered among mangrove prop roots, in undercut peat banks and under corals near islands, and they ranged in size from newly recruited juveniles to subadults. Lobsters preferred to shelter under large stony corals, but their use of mangrove prop roots nd undercut peat banks increased when the density of corals was low. Den residence time and distance moved within a site were similar at islands isolated by deep water channels and islands separated by shallow seagrass beds, but as a consequence of high immigration rates, population sizes were highest near shallow islands. Predation on newly settled juveniles was greater in seagrass and coral crevices than in mangrove prop roots, whereas the survival of larger juveniles was higher in mangroves and coral patch reefs than in seagrass. These results suggest that mangrove habitats may function as a nursery for juvenile spiny lobsters but that the use of this habitat depends on shelter characteristics and the isolation of islands.

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