Search results for: Chris M. Wood

Items from 1 to 20 out of 238 results

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Are we any closer to understanding why fish can die after severe exercise?

Peter Elliot Holder, Chris M. Wood, Michael J. Lawrence, Timothy D. Clark, more

Fish and Fisheries > 23 > 6 > 1400 - 1417

Post‐exercise mortality (PEM) may occur when fish exercise to exhaustion and are pushed so far beyond their physiological limits that they can no longer sustain life. Although fish exercise to overcome a variety of natural challenges, the phenomenon of PEM is most often observed as the result of interactions between fish and humans. The seminal work of Black (Can J Fish Aquat Sci, 15:573, 1958) and...

article

A novel K⁺‐dependent Na⁺ uptake mechanism during low pH exposure in adult zebrafish (Danio rerio): New tricks for old dogma

Alexander M. Clifford, Martin Tresguerres, Greg G. Goss, Chris M. Wood

Acta Physiologica > 234 > 3 > n/a - n/a

Aim To determine whether Na⁺ uptake in adult zebrafish (Danio rerio) exposed to acidic water adheres to traditional models reliant on Na⁺/H⁺ Exchangers (NHEs), Na⁺ channels and Na⁺/Cl⁻ Cotransporters (NCCs) or if it occurs through a novel mechanism. Methods Zebrafish were exposed to control (pH 8.0) or acidic (pH 4.0) water for 0‐12 hours during which ²²Na⁺ uptake (

{J^{Na}}_{in}

), ammonia excretion, net...

article

A Mystery Tale: Nickel Is Fickle When Snails Fail—Investigating the Variability in Ni Toxicity to the Great Pond Snail

Anne Crémazy, Kevin V Brix, D Scott Smith, Weibin Chen, more

Integrated Environmental Assessment and Management > 16 > 6 > 983 - 997

Dissolved Ni concentrations inhibiting the growth of juvenile great pond snails (Lymnaea stagnalis) have been documented to vary from about 1 to 200 µg L⁻¹ Ni. This variability makes L. stagnalis either a moderately sensitive or the most sensitive freshwater species to chronic Ni exposure tested to date. Given the role of sensitive species in environmental risk assessment frameworks, it is particularly...

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Dichloroacetate reveals the presence of metabolic inertia at the start of exercise in rainbow trout (Oncorhynchus mykiss, Walbaum 1792)

Chris M. Wood, Eric F. Pane, George J. F. Heigenhauser

Journal of Fish Biology > 97 > 4 > 1242 - 1246

A lag in the increase in oxygen consumption (MO₂) occurs at the start of sustainable exercise in trout. Waterborne dichloroacetate (0.58 and 3.49 mmol l⁻¹), a compound which activates pyruvate dehydrogenase (PDH) by inhibiting PDH kinase in muscle, accelerates the increase in MO₂ during the first 10 min of sustainable exercise when velocity is elevated to 75% critical swimming speed in a swim tunnel...

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Understanding the gastrointestinal physiology and responses to feeding in air‐breathing Anabantiform fishes

Harriet R. Goodrich, Mark Bayley, Lina Birgersson, William G. Davison, more

Journal of Fish Biology > 96 > 4 > 986 - 1003

The Mekong Delta is host to a large number of freshwater species, including a unique group of facultative air‐breathing Anabantiforms. Of these, the striped snakehead (Channa striata), the climbing perch (Anabas testudineus), the giant gourami (Osphronemus goramy) and the snakeskin gourami (Trichogaster pectoralis) are major contributors to aquaculture production in Vietnam. The gastrointestinal responses...

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Metal Bioavailability Models: Current Status, Lessons Learned, Considerations for Regulatory Use, and the Path Forward

Christopher A. Mebane, M. Jasim Chowdhury, Karel A.C. De Schamphelaere, Stephen Lofts, more

Environmental Toxicology and Chemistry > 39 > 1 > 60 - 84

Since the early 2000s, biotic ligand models and related constructs have been a dominant paradigm for risk assessment of aqueous metals in the environment. We critically review 1) the evidence for the mechanistic approach underlying metal bioavailability models; 2) considerations for the use and refinement of bioavailability‐based toxicity models; 3) considerations for the incorporation of metal bioavailability...

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The Effects of Natural Suspended Solids on Copper Toxicity to the Cardinal Tetra in Amazonian River Waters

Anne Crémazy, Chris M. Wood, D. Scott Smith, Adalberto L. Val

Environmental Toxicology and Chemistry > 38 > 12 > 2708 - 2718

The aim of the present study was to characterize the effects of particles on metal aquatic toxicity in a tropical system. To this end, we investigated the effects of natural suspended solids on copper (Cu) geochemistry and acute toxicity to the cardinal tetra (Paracheirodon axelrodi), in 2 Amazonian rivers with different total suspended solids (TSS) levels: the Rio Negro (low TSS ~ 8 mg L^–1) and the...

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An in vitro analysis of intestinal ammonia transport in fasted and fed freshwater rainbow trout: roles of NKCC, K⁺ channels, and Na⁺, K⁺ ATPase

Julian G. Rubino, Jonathan M. Wilson, Chris M. Wood

Journal of Comparative Physiology B > 2019 > 189 > 5 > 549-566

We examined mechanisms of ammonia handling in the anterior, mid, and posterior intestine of unfed and fed freshwater rainbow trout (Oncorhynchus mykiss), with a focus on the Na⁺:K⁺:2Cl⁻ co-transporter (NKCC), Na⁺:K ⁺-ATPase (NKA), and K⁺ channels. NKCC was localized by immunohistochemistry to the mucosal (apical) surface of enterocytes, and NKCC mRNA was upregulated after feeding in the anterior and...

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Sizes, condition factors and sex ratios of the scattered populations of the small cichlid fish, Alcolapia grahami, that inhabits the lagoons and sites of Lake Magadi (Kenya), one of the most extreme aquatic habitat on Earth

John N. Maina, Geraldine D. Kavembe, Michael B. Papah, Reatlegile Mashiteng, more

Environmental Biology of Fishes > 2019 > 102 > 10 > 1265-1280

Alcolapia grahami is a small cichlid fish that inhabits the scattered lagoons and sites of Lake Magadi (Kenya). Exceptional physiological, morphological, biochemical and behavioural adaptations allow the fish to tolerate the harsh environmental conditions that exist in the locations, the most extreme milieus occupied by a species of fish on Earth. The temperature of the water is inordinately high...

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Pulsatile urea excretion in Gulf toadfish: the role of circulating serotonin and additional 5-HT receptor subtypes

Maria C. Cartolano, Haley N. Gancel, Joshua Lonthair, Chris M. Wood, more

Journal of Comparative Physiology B > 2019 > 189 > 5 > 537-548

The neurochemical serotonin (5-HT) is involved in stimulating pulsatile urea excretion in Gulf toadfish (Opsanus beta) through the 5-HT_2A receptor; however, it is not known if (1) the 5-HT signal originates from circulation or if (2) additional 5-HT receptor subtypes are involved. The first objective was to test whether 5-HT may be acting as a hormone in the control of pulsatile urea excretion by...

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Does dissolved organic carbon from Amazon black water (Brazil) help a native species, the tambaqui Colossoma macropomum to maintain ionic homeostasis in acidic water?

Helen Sadauskas‐Henrique, Chris M. Wood, Luciana R. Souza‐Bastos, Rafael M. Duarte, more

Journal of Fish Biology > 94 > 4 > 595 - 605

To assess how the quality and properties of the natural dissolved organic carbon (DOC) could drive different effects on gill physiology, we analysed the ionoregulatory responses of a native Amazonian fish species, the tambaqui Colossoma macropomum, to the presence of dissolved organic carbon (DOC; 10 mg l⁻¹) at both pH 7.0 and pH 4.0 in ion‐poor water. The DOC was isolated from black water from São...

article

The ventilation mechanism of the Pacific hagfish Eptatretus stoutii

Junho Eom, Chris M. Wood

Journal of Fish Biology > 94 > 2 > 261 - 276

We made anatomical and physiological observations of the breathing mechanisms in Pacific hagfish Eptatretus stoutii, with measurements of nostril flow and pressure, mouth and pharyngo‐cutaneous duct (PCD) pressure and velum and heart impedance and observations of dye flow patterns. Resting animals frequently exhibit spontaneous apnea. During normal breathing, water flow is continuous at a high rate...

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Mechanisms of Ca²⁺ uptake in freshwater and seawater-acclimated killifish, Fundulus heteroclitus, and their response to acute salinity transfer

Alex M. Zimmer, Kevin V. Brix, Chris M. Wood

Journal of Comparative Physiology B > 2019 > 189 > 1 > 47-60

Killifish (Fundulus heteroclitus) has been extensively used as a model for ion regulation by euryhaline fishes. Na⁺ and Cl⁻ dynamics have been well studied in killifish, but few studies have addressed that of Ca²⁺. Therefore, this study aimed to characterize Ca²⁺ fluxes in freshwater (FW) and seawater (SW)-acclimated killifish, their response to salinity transfer, and to elucidate the mechanisms of...

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Acute temperature effects on metabolic rate, ventilation, diffusive water exchange, osmoregulation, and acid–base status in the Pacific hagfish (Eptatretus stoutii)

Marina Giacomin, Junho Eom, Patricia M. Schulte, Chris M. Wood

Journal of Comparative Physiology B > 2019 > 189 > 1 > 17-35

The Pacific hagfish (Eptatretus stoutii) is a representative of the most basal extant craniates, and is a marine osmoconformer with an extremely low metabolic rate (MO₂ = 475 µmol O₂/kg/h at 12 °C). We investigated potential physiological trade-offs associated with compensatory changes in gill ventilation and perfusion when 12 °C-acclimated hagfish were acutely exposed to 7 °C or 17 °C, as reflected...

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Physiological protective action of dissolved organic carbon on ion regulation and nitrogenous waste excretion of zebrafish (Danio rerio) exposed to low pH in ion-poor water

Rafael M. Duarte, Chris M. Wood, Adalberto L. Val, D. Scott Smith

Journal of Comparative Physiology B > 2018 > 188 > 5 > 793-807

Dissolved organic carbon (DOC) represents a heterogeneous group of naturally-occurring molecules in aquatic environments, and recent studies have evidenced that optically dark DOCs can exert some positive effects on ionoregulatory homeostasis of aquatic organisms in acidic waters. We investigated the effects of Luther Marsh DOC, a dark allochthonous DOC, on ion regulation and N-waste excretion of...

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Copper uptake, patterns of bioaccumulation, and effects in glochidia (larvae) of the freshwater mussel (Lampsilis cardium)

Marianna B. Jorge, Adalto Bianchini, Chris M. Wood, Patricia L. Gillis

Environmental Toxicology and Chemistry > 37 > 4 > 1092 - 1103

The early life stages of freshwater mussels are particularly sensitive to copper (Cu) contamination. We measured the acute toxicity, bioaccumulation, and sublethal effects of Cu in glochidia. In addition, we used radiolabeled Cu (⁶⁴Cu) to examine the time‐dependent kinetics of uptake over 24 h. Uptake of ⁶⁴Cu by live and dead glochidia exposed to 0.11 μmol/L exhibited similar hyperbolic patterns...

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The effects of high environmental ammonia on the structure of rainbow trout hierarchies and the physiology of the individuals therein

Josias M.B. Grobler, Chris M. Wood

Aquatic Toxicology > 2018 > 195 > C > 77-87

Our goals were: (i) to determine whether sublethal concentrations of water-borne ammonia would prevent the formation of a dominance hierarchy, or alter its structure, in groups of 4 juvenile trout; (ii) to investigate the behavioral and physiological responses of individuals of different social rank exposed to a concentration of ammonia that still allowed hierarchy formation. Social hierarchies were...

article

Air-breathing behavior, oxygen concentrations, and ROS defense in the swimbladders of two erythrinid fish, the facultative air-breathing jeju, and the non-air-breathing traira during normoxia, hypoxia and hyperoxia

Bernd Pelster, Chris M. Wood, Ellen Jung, Adalberto L. Val

Journal of Comparative Physiology B > 2018 > 188 > 3 > 437-449

The jeju Hoplerythrinus unitaeniatus and the traira Hopliasmalabaricus are two neighboring genera from the family of erythrinid fish, both possessing a two-chambered physostomous swimbladder. In the jeju the anterior section of the posterior bladder is highly vascularized, and the swimbladder is used for aerial respiration; the traira, in turn, is a water-breather that uses the swimbladder as a buoyancy...

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Characterization of the effects of binary metal mixtures on short-term uptake of Cd, Pb, and Zn by rainbow trout (Oncorhynchus mykiss)

Kevin V. Brix, Margaret S. Tellis, Anne Crémazy, Chris M. Wood

Aquatic Toxicology > 2017 > 193 > C > 217-227

Biotic Ligand Models (BLMs) for individual metals improve our ability to regulate metals in the aquatic environment by considering the effects of water quality parameters (ionic composition, pH, DOC) on metal bioavailability. However, in natural aquatic systems, organisms are often simultaneously exposed to multiple metals and these interactions are not currently considered in BLMs or most environmental...

article

Corrigendum to “Nickel toxicity to cardinal tetra (Paracheirodon axelrodi) differs seasonally and among the black, white and clear river waters of the Amazon Basin” [Water Res. 123 (2017) 21–29]

Aleicia Holland, Chris M. Wood, D. Scott Smith, Tiago Gabriel Correia, more

Water Research > 2017 > 126 > C > 531

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INFONA - science communication portal

Search results for: Chris M. Wood

Are we any closer to understanding why fish can die after severe exercise?

A novel K⁺‐dependent Na⁺ uptake mechanism during low pH exposure in adult zebrafish (Danio rerio): New tricks for old dogma

A Mystery Tale: Nickel Is Fickle When Snails Fail—Investigating the Variability in Ni Toxicity to the Great Pond Snail

Dichloroacetate reveals the presence of metabolic inertia at the start of exercise in rainbow trout (Oncorhynchus mykiss, Walbaum 1792)

Understanding the gastrointestinal physiology and responses to feeding in air‐breathing Anabantiform fishes

Metal Bioavailability Models: Current Status, Lessons Learned, Considerations for Regulatory Use, and the Path Forward

The Effects of Natural Suspended Solids on Copper Toxicity to the Cardinal Tetra in Amazonian River Waters

An in vitro analysis of intestinal ammonia transport in fasted and fed freshwater rainbow trout: roles of NKCC, K⁺ channels, and Na⁺, K⁺ ATPase

Sizes, condition factors and sex ratios of the scattered populations of the small cichlid fish, Alcolapia grahami, that inhabits the lagoons and sites of Lake Magadi (Kenya), one of the most extreme aquatic habitat on Earth

Pulsatile urea excretion in Gulf toadfish: the role of circulating serotonin and additional 5-HT receptor subtypes

Does dissolved organic carbon from Amazon black water (Brazil) help a native species, the tambaqui Colossoma macropomum to maintain ionic homeostasis in acidic water?

The ventilation mechanism of the Pacific hagfish Eptatretus stoutii

Mechanisms of Ca²⁺ uptake in freshwater and seawater-acclimated killifish, Fundulus heteroclitus, and their response to acute salinity transfer

Acute temperature effects on metabolic rate, ventilation, diffusive water exchange, osmoregulation, and acid–base status in the Pacific hagfish (Eptatretus stoutii)

Physiological protective action of dissolved organic carbon on ion regulation and nitrogenous waste excretion of zebrafish (Danio rerio) exposed to low pH in ion-poor water

Copper uptake, patterns of bioaccumulation, and effects in glochidia (larvae) of the freshwater mussel (Lampsilis cardium)

The effects of high environmental ammonia on the structure of rainbow trout hierarchies and the physiology of the individuals therein

Air-breathing behavior, oxygen concentrations, and ROS defense in the swimbladders of two erythrinid fish, the facultative air-breathing jeju, and the non-air-breathing traira during normoxia, hypoxia and hyperoxia

Characterization of the effects of binary metal mixtures on short-term uptake of Cd, Pb, and Zn by rainbow trout (Oncorhynchus mykiss)

Corrigendum to “Nickel toxicity to cardinal tetra (Paracheirodon axelrodi) differs seasonally and among the black, white and clear river waters of the Amazon Basin” [Water Res. 123 (2017) 21–29]

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