How quickly do brook trout lose long-term thermal acclimation?

Journal of Thermal Biology, Год журнала: 2025, Номер unknown, С. 104103 - 104103

Опубликована: Март 1, 2025

Язык: Английский

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Fick’s Diffusion Laws and Scaling of the Gill Surface Area and Oxygen Uptake in Fish

Fishes, Год журнала: 2025, Номер 10(5), С. 233 - 233

Опубликована: Май 16, 2025

The oxygen consumption of adult fish (Q) is proportional to their body weight (W) raised a power, estimated as the slope (dQ) linear regression log(Q) vs. log(W). Similarly, gill surface area (GSA) W power dG, also via log-log area. Moreover, because Fick’s laws diffusion, dQ should be at least similar dG. Recently, claim has been made that non-zero differences between and dG invalidate Gill-Oxygen Limitation Theory (GOLT), which suggests O2 supplied by gills growing with <1 limits growth older larger fish. We show here, based on 33 pairs in species other information (i) while individual are observed several cases, there no significant overall difference across estimates (ii) large primarily due ontogenetic changes scaling (OCS), likely gills’ water–blood (or ‘diffusion’) distance and, well, multiple sources experimental variability potential errors, leading outliers random differences.

Язык: Английский

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Testing mechanistic theories must be based on correct interpretations

Journal of Experimental Biology, Год журнала: 2024, Номер 227(16)

Опубликована: Авг. 15, 2024

Journal of Experimental Biology has recently published a number studies that critically discussed the Gill-Oxygen Limitation Theory (GOLT, see Pauly, 2021), and Lonthair et al. (2024) is latest contribution to current debate. We welcome increasing interest in this theory, especially by physiologists who examine link between temperatures growth fishes. However, testing theory must be based on its actual premises hypotheses, we have conclude model does not correspond any GOLT's assumptions instead, results are entirely predicted as show here.As find, higher reduce Arctic char (Salvelinus fontinalis) while increase gill surface area metabolic rate scale with similar slopes. The authors interpret observation contradictory GOLT. similarity slopes actually an inherent component GOLT, explicitly stated (Pauly, 2019, 2021).Central arguments presented parameter introduced Scheuffele (2021), which these believe derived from GOLT: bS, i.e. difference scaling exponents (bMR) (bGSA). Thus:(1)As both (2021) assert, order for GOLT apply, bS should ≤0. Therefore, conclude, values bS>0 would refute since allometric GSA make it faster than MR body size. always assumed bGSA bMR about same (see pp. 36–37), where referred 'dG' 'dQ,' respectively, used substitute one another. Thus, al.'s interpretation overlooks fundamental presumed approximately equal 2019). Random deviations balance, whether positive or negative, inherently theory. Instead, consistent equilibrium indeed challenge validity GOLT.Furthermore, put forth suggests implies fish continue grow until their vital functions verge collapse due oxygen limitation, biologically implausible. In reality, posits grow, they gradually allocate less surplus until, at maximum size given environment, all available utilized non-growth functions. This distinction crucial; suggest older owing inability maintain normal activities, but rather reach point no support further growth.At core lies modified Pütter's equation (1920), describes (dW/dt) function anabolic processes (HWd) breakdown (kW):(2)While Pütter (1920) universally 2/3, range 0.6 0.9 (and <1) adults. larger, energy (i.e. oxygen) build new mass, decreasing rates.Lonthair ignore literature documented problem measured uptake data respirometry experiments resulting definition standard understood reflecting consumption without overhead costs growth. view reflect knowledge topic neglects fact juvenile even after fasting periods 24–48 h. leads overestimation SMR compared large (old) fish, only ones do resources e.g. Parry, 1983; Rosenfeld al., 2015; Chabot 2016).Like Lefevre (2016), assume 24 h enough exclude (2015), however, pointed out use different procedures colleagues working endotherms, demonstrated abruptly halt fasting. heavily influenced food rations days weeks before Animals were fed 35 period showed up 65%, suggesting alone insufficient effects rate.The recent critiques (e.g. 2021 Lefevre, 2016) whose base argument, address issues. Many cited either specify employ short durations effectively rate. Without proper consideration factors, conclusions drawn supported evidence.In conclusion, critique offered may valuable adds more can related debate, essential ensure such grounded thorough understanding theories examined. Failure consider well overlooking significant methodological issues measurements, will unavoidably lead misinterpretations flawed conclusions. What now required rigorous approaches evaluate implications physiological responses changing environmental conditions.

Язык: Английский

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Does death drive the scaling of life?

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 29, 2024

ABSTRACT The magnitude of many kinds biological structures and processes scale with organismal size, often in regular ways that can be described by power functions. Traditionally, these “biological scaling” relationships have been explained based on internal geometric, physical, energetic constraints according to universal natural laws, such as the “surface law” “3/4‐power law”. However, during last three decades it has become increasingly apparent scaling vary greatly response various external (environmental) factors. In this review, I propose provide several lines evidence supporting a new ecological perspective call “mortality theory ecology” (MorTE). According viewpoint, mortality imposes time limits growth, development, reproduction organisms. Accordingly, small, vulnerable organisms subject high due predation other environmental hazards evolved faster, shorter lives than larger, more protected A MorTE also includes corollary, size‐related causative factors (e.g. intraspecific resource competition, geometric surface area volume effects supply/transport protection tissues from hazards, homeostatic regulatory systems, incidence pathogens parasites, etc.) impact life. mortality‐centred approach successfully predicts ranges body‐mass slopes observed for traits. Furthermore, argue rate should considered ultimate (evolutionary) driver life, is expressed context proximate (functional) drivers information‐based regulation spatial (geometric) (metabolic) constraints.

Язык: Английский

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Carryover effects of embryonic hypoxia exposure on adult fitness of the Pacific abalone

Environmental Research, Год журнала: 2024, Номер 260, С. 119628 - 119628

Опубликована: Июль 22, 2024

Язык: Английский

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The gill oxygen limitation hypothesis remains unsupported by experimental evidence. Response to ‘Testing mechanistic theories must be based on correct interpretations’

Journal of Experimental Biology, Год журнала: 2024, Номер 227(16)

Опубликована: Авг. 15, 2024

Язык: Английский

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Behavioral, electrocardiographic, and opercular beat recording characterization of tilapia (Oreochromis niloticus) in immersion bath with different concentrations of tricaine (MS-222)

Aquaculture, Год журнала: 2024, Номер unknown, С. 741700 - 741700

Опубликована: Сен. 1, 2024

Язык: Английский

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Fishes in Warming Waters, the Gill-Oxygen Limitation Theory and the Debate Around Mechanistic Growth Models

Fishes, Год журнала: 2024, Номер 9(11), С. 430 - 430

Опубликована: Окт. 25, 2024

Mechanistic explanations of the impact climate change on fish growth are currently under debate. However, critical assessments even most prominent theories not always based accurate interpretations their underlying mechanistic models. This contribution addresses some major misunderstandings still causing Gill-Oxygen Limitation Theory (GOLT) from being examined its actual structuring elements and assumptions, rather than erroneous perceptions. As we argue, recent critiques GOLT implausible respirometry data that invoked to distinguish maintenance costs overhead growth. Discussing current state debate, emphasize fact fasting young and, thus, growing for short periods time is sufficient suppress energy (i.e., oxygen) allocation In process dealing with these issues, several cases apparent ‘counter-evidence’ discussed. Highlighting need base discussions examinations predictions, recommend testing theory should focus broad reviews or meta-analyses, e.g., datasets gill surface area relationship performance different temperature regimes.

Язык: Английский

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Behavioral, Electrocardiographic, and Opercular Beat Recording Characterization of Tilapia (O. Niloticus) in Immersion Bath with Different Concentrations of Tricaine (Ms-222)

Опубликована: Янв. 1, 2024

Язык: Английский

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