The intestinal response to feeding in seawater gulf toadfish, <i>Opsanus beta</i>, includes elevated base secretion and increased epithelial oxygen consumption

Taylor, Janet; Grosell, Martin

doi:10.1242/jeb.034579

Cited by 43 publications

(43 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bucking and colleagues (Bucking et al, 2009) evaluated this idea using an in vitro gut sac technique and showed that net intestinal base secretion rates were greatly elevated after feeding in seawater-acclimated trout, as postulated. Taylor and Grosell (Taylor and Grosell, 2009) provided similar evidence in the marine toadfish using an Ussing chamber approach. However, intestinal base secretion remained low and unchanged after feeding in freshwater-acclimated trout (Bucking et al, 2009), and so the explanation for freshwater fish with acid-secreting stomachs is uncertain.…”

Section: The Absence Of a Change In Net Acid-base Fluxes After Feedingmentioning

confidence: 74%

“…This is not to say that rates in seawater preparations were low, as they were in the range reported for many other marine fish (Wilson et al, 2002;Wilson and Grosell, 2003;Grosell et al, 2005;Grosell et al, 2009a;Grosell, 2006;Grosell and Taylor, 2007;Bucking et al, 2009;Taylor and Grosell, 2009). Rather, freshwater rates were unexpectedly high.…”

Section: Intestinal Base Secretion In Relation To Salinity and Feedinmentioning

confidence: 81%

“…The in vivo measurements support this view (Fig.3C). It could be argued that, as there is no elevation of HCl secretion after feeding owing to the absence of an acid-secreting stomach, there is no need for greater intestinal HCO 3 -secretion at this time, in contrast to in vitro measurements in seawater preparations (Bucking et al, 2009;Taylor and Grosell, 2009) and in vivo data from other teleosts with gastric HCl secretion (Taylor and Grosell, 2006;Taylor et al, 2007). But why should base secretion rates decrease after feeding?…”

Section: Intestinal Base Secretion In Relation To Salinity and Feedinmentioning

confidence: 99%

“…It plays a key role in the osmoregulatory strategy of marine teleosts by precipitating Ca 2+ and Mg 2+ from intestinal fluids and thereby promoting fluid absorption (reviewed by Wilson et al, 2002;Grosell, 2006). Taylor and Grosell (Taylor and Grosell, 2006) provided evidence that intestinal base secretion by means of Cl -/HCO 3 -exchange was greatly enhanced in the marine gulf toadfish post feeding and have since demonstrated that it occurs to an extent sufficient to account for a lack of an alkaline tide in this species (Taylor and Grosell, 2009). Furthermore, Bucking et al (Bucking et al, 2009) used an in vitro gut sac technique to demonstrate that intestinal HCO 3 -secretion and Cl -uptake rates were greatly elevated after feeding in seawater-acclimated trout but remained unchanged after feeding in freshwater-acclimated trout.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Acid–base responses to feeding and intestinal Cl– uptake in freshwater- and seawater-acclimated killifish,Fundulus heteroclitus, an agastric euryhaline teleost

Wood

Bucking

Grosell

2010

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYMarine teleosts generally secrete basic equivalents (HCO 3 -) and take up Na + and Cl -in the intestine so as to promote absorption of H 2 O. However, neither the integration of these functions with feeding nor the potential role of the gut in ionoregulation and acid-base balance in freshwater have been well studied. The euryhaline killifish (Fundulus heteroclitus) is unusual in lacking both an acid-secreting stomach and a mechanism for Cl -uptake at the gills in freshwater. Responses to a satiation meal were evaluated in both freshwater-and seawater-acclimated killifish. In intact animals, there was no change in acid or base flux to the external water after the meal, in accord with the absence of any post-prandial alkaline tide in the blood. Indeed, freshwater animals exhibited a post-prandial metabolic acidosis ('acidic tide'), whereas seawater animals showed no change in blood acid-base status. In vitro gut sac experiments revealed a substantially higher rate of Cl -absorption by the intestine in freshwater killifish, which was greatest at 1-3h after feeding. The Cl -concentration of the absorbate was higher in preparations from freshwater animals than from seawater killifish and increased with fasting. Surprisingly, net basic equivalent secretion rates were also much higher in preparations from freshwater animals, in accord with the 'acidic tide'; in seawater preparations, they were lowest after feeding and increased with fasting. Bafilomycin (1moll -1 ) promoted an 80% increase in net base secretion rates, as well as in Cl -and fluid absorption, at 1-3h post-feeding in seawater preparations only, explaining the difference between freshwater and seawater fish. Preparations from seawater animals at 1-3h post-feeding also acidified the mucosal saline, and this effect was associated with a marked rise in P CO 2, which was attenuated by bafilomycin. Measurements of chyme pH from intact animals confirmed that intestinal fluid (chyme) pH and basic equivalent concentration were lowest after feeding in seawater killifish, whereas P CO 2 was greatly elevated (80-95 Torr) in chyme from both seawater and freshwater animals but declined to lower levels (13 Torr) after 1-2 weeks fasting. There were no differences in pH, P CO 2 or the concentrations of basic equivalents in intestinal fluid from seawater versus freshwater animals at 12-24h or 1-2 weeks post-feeding. The results are interpreted in terms of the absence of gastric HCl secretion, the limitations of the gills for acid-base balance and Cl -transport, and therefore the need for intestinal Cl -uptake in freshwater killifish, and the potential for O 2 release from the mucosal blood flow by the high P CO 2 in the intestinal fluids. At least in seawater killifish, H + -ATPase running in parallel to HCO 3 -:Cl -exchange in the apical membranes of teleost enterocytes might reduce net base secretion and explain the high P CO 2 in the chyme after feeding.

show abstract

Section: The Absence Of a Change In Net Acid-base Fluxes After Feedingmentioning

confidence: 74%

Section: Intestinal Base Secretion In Relation To Salinity and Feedinmentioning

confidence: 81%

Section: Intestinal Base Secretion In Relation To Salinity and Feedinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acid–base responses to feeding and intestinal Cl– uptake in freshwater- and seawater-acclimated killifish,Fundulus heteroclitus, an agastric euryhaline teleost

Wood

Bucking

Grosell

2010

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…The effect of feeding on a variety of physiological parameters in teleosts has been investigated recently in seawater [e.g. acid-base regulation (Bucking et al, 2009;Taylor et al, 2007;Taylor and Grosell, 2006;Taylor and Grosell, 2009;Wood et al, 2010), salt balance (Bucking et al, 2011;Taylor et al, 2007;Taylor and Grosell, 2006)] and freshwater [e.g. acid-base regulation (Bucking and Wood, 2008;Cooper and Wilson, 2008;Taylor et al, 2007;Wood et al, 2010), salt balance (Bucking and Wood, 2006a;Bucking and Wood, 2007;Taylor et al, 2007), water balance (Bucking and Wood, 2006b)].…”

Section: Introductionmentioning

confidence: 99%

Diet influences salinity preference of an estuarine fish, the killifishFundulus heteroclitus

Bucking

Wood

Grosell

2012

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYUnderstanding the interplay among the external environment, physiology and adaptive behaviour is crucial for understanding how animals survive in their natural environments. The external environment can have wide ranging effects on the physiology of animals, while behaviour determines which environments are encountered. Here, we identified changes in the behavioural selection of external salinity in Fundulus heteroclitus, an estuarine teleost, as a consequence of digesting a meal. Fish that consumed high levels of dietary calcium exhibited a higher preferred salinity compared with unfed fish, an effect that was exaggerated by elevated dietary sodium chloride. The mean swimming speed (calculated as a proxy of activity level) was not affected by consuming a diet of any type. Constraining fish to water of 22p.p.t. salinity during the digestion of a meal did not alter the amount of calcium that was absorbed across the intestine. However, when denied the capacity to increase their surrounding salinity, the compromised ability to excrete calcium to the water resulted in significantly elevated plasma calcium levels, a potentially hazardous physiological consequence. This study is the first to show that fish behaviourally exploit their surroundings to enhance their ionoregulation during digestion, and to pinpoint the novel role of dietary calcium and sodium in shaping this behaviour. We conclude that in order to resolve physiological disturbances in ion balance created by digestion, fish actively sense and select the environment they inhabit. Ultimately, this may result in transient diet-dependent alteration of the ecological niches occupied by fishes, with broad implications for both physiology and ecology.

show abstract

Osmoregulation and Excretion

Larsen

Deaton

Onken

et al. 2014

Comprehensive Physiology

181

141

View full text Add to dashboard Cite

The article discusses advances in osmoregulation and excretion with emphasis on how multicellular animals in different osmotic environments regulate their milieu intérieur. Mechanisms of energy transformations in animal osmoregulation are dealt with in biophysical terms with respect to water and ion exchange across biological membranes and coupling of ion and water fluxes across epithelia. The discussion of functions is based on a comparative approach analyzing mechanisms that have evolved in different taxonomic groups at biochemical, cellular and tissue levels and their integration in maintaining whole body water and ion homeostasis. The focus is on recent studies of adaptations and newly discovered mechanisms of acclimatization during transitions of animals between different osmotic environments. Special attention is paid to hypotheses about the diversity of cellular organization of osmoregulatory and excretory organs such as glomerular kidneys, antennal glands, Malpighian tubules and insect gut, gills, integument and intestine, with accounts on experimental approaches and methods applied in the studies. It is demonstrated how knowledge in these areas of comparative physiology has expanded considerably during the last two decades, bridging seminal classical works with studies based on new approaches at all levels of anatomical and functional organization. A number of as yet partially unanswered questions are emphasized, some of which are about how water and solute exchange mechanisms at lower levels are integrated for regulating whole body extracellular water volume and ion homeostasis of animals in their natural habitats. © 2014 American Physiological Society.

show abstract

The intestinal response to feeding in seawater gulf toadfish, Opsanus beta, includes elevated base secretion and increased epithelial oxygen consumption

Cited by 43 publications

References 43 publications

Acid–base responses to feeding and intestinal Cl– uptake in freshwater- and seawater-acclimated killifish,Fundulus heteroclitus, an agastric euryhaline teleost

Acid–base responses to feeding and intestinal Cl– uptake in freshwater- and seawater-acclimated killifish,Fundulus heteroclitus, an agastric euryhaline teleost

Diet influences salinity preference of an estuarine fish, the killifishFundulus heteroclitus

Osmoregulation and Excretion

Contact Info

Product

Resources

About