Effects of temperature and body size on the physiological energetics of the stalked sea squirt Styela clava

Kang, Chang‐Keun; Lee, Young Jae; Han, Eunah; Park, Hyun-Je; Yun, Sung Gyu; Lee, Won Chan

doi:10.1016/j.jembe.2014.10.026

Cited by 9 publications

(12 citation statements)

References 34 publications

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“…Fecal energy of the Manila clam measured in this study was independent of temperature and, instead, was largely determined by SPM concentration. However, the energy fraction (less than 5% of filtered energy in the present study) rejected by fecal materials of the clam was much lower than those reported for marine invertebrates [ 2 , 14 , 33 ]. This probably arose from the low levels of organic content (ca.…”

Section: Discussioncontrasting

confidence: 84%

“…These results suggest that the filtration rate of the clam may not necessarily reflect its CR [ 43 , 63 ]. Filtration of marine invertebrates increases concurrently with temperature up to an optimal level and then decreases significantly beyond this level [ 6 , 14 , 36 , 47 ]. A similar trend in relation to increasing SPM concentration has also been demonstrated for intertidal and estuarine bivalves [ 2 , 3 , 15 , 30 , 40 ].…”

Section: Discussionmentioning

confidence: 99%

“…When metabolic loss of energy in an animal is elevated under warmer conditions, the animal will increase energy acquisition through food intake to compensate for the loss [ 10 , 11 , 12 ]. In contrast, animals that lack compensatory adjustment through feeding will encounter a negative energy budget because of elevated metabolic costs [ 13 , 14 ]. However, such an effect of temperature on physiological energetics may be masked by the amount of ingested food due to changes in the availability of food [ 3 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Temperature and Seston Concentration on the Physiological Energetics of the Manila Clam Ruditapes philippinarum

et al. 2016

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The suspension-feeding Manila clam Ruditapes philippinarum is a native species of the western Pacific that is now widely distributed around the globe because of its commercial importance. To determine the adaptive physiological responses to changing thermal and nutritional conditions, clearance, filtration, feces production, ammonium excretion, respiration rates, and scope for growth (SFG) were measured in adult clams. The clams were exposed to 24 treatments involving the combination of four water temperatures (8, 13, 18, and 23°C) and six concentrations of suspended particulate matter (SPM: 9.5 to 350.5 mg L–1). Physiological rates were standardized by using the mean (480 mg) of tissue dry weights of experimental clams using allometric equations between physiological variables and tissue dry weight. Higher clearance rates were recorded at higher temperatures and lower SPM concentrations, and these rates decreased with increasing SPM concentration at individual temperatures. Consumed energy increased with increasing temperature and SPM concentration, peaking at around 100–200 mg L–1 at 18–23°C. Whereas fecal energy was largely determined by SPM concentration, ammonia excretion was mainly governed by temperature. Respiration rate studies revealed a predominant quadratic effect of temperature on the metabolism, indicating a lack of acclimatory adjustment of metabolic rate to rising temperature. SFG values were positive under almost all the treatment conditions and were much higher at higher SPM concentrations (> 45 mg L–1), with the highest level being recorded at 18°C and 100–200 mg L–1 SPM. Increased filtration rate offset the increased metabolic cost at warm temperatures. Our holistic findings suggest that a high degree of physiological plasticity allows R. philippinarum to tolerate the wide range of temperatures and SPM concentrations that are found in tidal flats, accounting in part for the successful distribution of this species over a wide variety of geographical areas.

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Section: Discussioncontrasting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined Effects of Temperature and Seston Concentration on the Physiological Energetics of the Manila Clam Ruditapes philippinarum

et al. 2016

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“…The Q10 of metabolic rate was maximized by 2.02 at high temperatures of 23-28 °C compared with the minimum (1.29) of filtration rate at the same temperatures, suggesting that metabolic rate is more sensitive to temperatures above the optimal value. This implies that the feeding rate did not increase as much because it compensated for the increased metabolic cost at 28 °C [25,32].…”

Section: Discussionmentioning

confidence: 99%

“…The Q10 provides significant information regarding the attributes of an individual physiological component in animals [23,24]. Identifying the individual-based reactions induced by environmental changes further requires interpretation of energy dynamics based on measurements of overall physiological processes [25]. Despite a general consensus about the temperature dependence of metabolic rates in marine ectotherms, the species-specific responses deviate from a typical exponential curve, thus mismatching the expected metabolic trend [26].…”

Section: Introductionmentioning

confidence: 99%

Thermal effect on energetic physiology in the ark shell Scapharca subcrenata

Kang

Seong

Lee

et al. 2020

Preprint

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Background: Clams inhabiting temperate coastal zones are affected not only by seasonal thermal variation, but also by changes in the prevailing thermal regime of their habitats. Understanding the physiological processes required for adjusting the energy balance of the ark shell Scapharca subcrenata to varying thermal conditions is pivotal for predicting its growth and further phenology, and ultimately promoting successful aquaculture activity. Thermal effects on the physiological processes and the combined energetic physiology at the organism level of S. subcrenata were assessed over a temperature range corresponding to field conditions (3–28 °C). Results: Physiological rates of S. subcrenata were well correlated with its dry tissue weight, formalizing allometric relationships. Extremely low weight exponent values for filtration rate and metabolic rate were detected at lower (3–8 °C) compared to higher (8–28 °C) temperatures. In addition to marked reductions at 3 °C, weight exponents were identical and intercept estimates increased progressively with rising temperature over the temperature range (8–28 °C). Identical weight exponents and increasing intercept estimates for both feces production and excretion rates across the experimental temperatures indicated that energy losses by egestion and excretion increased gradually with rising temperature. Scope for growth and net growth efficiency showed relatively constant and positive values at 8–23 °C, suggesting an optimal temperature range for production, but dropped drastically to negative values at 3 and 28 °C, indicating thermal (both cold and heat) stress. The Q10 values revealed that the metabolic and filtration rates are more sensitive at 23–28 and 3–8 °C, respectively. Conclusions: Allometric size-scaling of physiological rates in S. subcrenata highlights species-specific responses to changes in temperature. The observed weight exponents and intercept estimates for filtration and metabolic rates reveal the variation of the thermal effects according to size as well as an incapability of acclimation to varying temperatures. Reversed thermal sensitivities in both components confirm that energy acquisition by feeding does not offset the metabolic energy cost outside the optimal thermal range. Our empirical analysis allowed further understanding of the seasonal energy dynamism and biological cycle of S. subcrenata in temperate habitats subject to highly variable thermal regimes.

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Compared stress tolerance to short-term exposure in native and invasive tunicates from the NE Atlantic: when the invader performs better

2018

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10The combined impact of invasive species and climate change threatens natural systems worldwide, 11 often facilitating the expansion of harmful invasive species. It is imperative to understand the 12 mechanisms behind why species become invasive and widespread. Traditionally, it is thought that 13 invasive species have greater tolerances to a wider array of environmental conditions than natives. We 14 therefore tested the hypothesis that invasive species are more tolerant to the effects of short term 15 exposure to temperature and salinity stress. Using unifactorial experiments, we compared the 16 tolerances of two common fouling NE Atlantic ascidians, the native Ciona intestinalis and the 17 invasive Styela clava, to increased temperature and decreased salinity. We measured lethal and 18 behavioural responses affecting 50% of populations to give an indication of the tolerance limits for 19 temperature (LT 50 ) and salinity (EC 50 ), and respiration rate to give an indication of the change in 20 metabolic response. The invasive S. clava was more tolerant to increased stress (LT 50 = 29.5 °C, EC 50 21 = 19.5) compared with C. intestinalis (LT 50 = 27.0 °C, EC 50 = 22.7), whereas both species displayed 22 428We are undoubtfully grateful to the Harbour Authority of the Château Marina in Brest for their 429 authorisation in collection. We would like also to thank Jérôme Coudret and Mathieu Camusat for 430 help with field collection, and Sophie Martin for help with the respiration measurements and analysis. 431We are also grateful to the 'Service Mer et Observation' and to the 'Centre de Ressources en Biologie 432

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Effects of temperature and body size on the physiological energetics of the stalked sea squirt Styela clava

Cited by 9 publications

References 34 publications

Combined Effects of Temperature and Seston Concentration on the Physiological Energetics of the Manila Clam Ruditapes philippinarum

Combined Effects of Temperature and Seston Concentration on the Physiological Energetics of the Manila Clam Ruditapes philippinarum

Thermal effect on energetic physiology in the ark shell Scapharca subcrenata

Compared stress tolerance to short-term exposure in native and invasive tunicates from the NE Atlantic: when the invader performs better

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