High-Temperature Tolerances of Fluvial Arctic Grayling and Comparisons with Summer River Temperatures of the Big Hole River, Montana

Lohr, Sam; Byorth, Patrick A.; Kaya, Calvin M.; Dwyer, William P.

doi:10.1577/1548-8659(1996)125<0933:httofa>2.3.co;2

Cited by 56 publications

(49 citation statements)

References 13 publications

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“…In nature, fluvial Arctic grayling, Thymallus arcticus, living at the extreme southern extent of their historical geographic distribution can experience temperatures exceeding their upper incipient lethal temperature (25.0°C), but the exposure is infrequent and brief (Lohr et al 1996). In the laboratory, cutthroat trout, O. clarki, did not die when experiencing a 7-day daily temperature cycle of 20-26°C, even though chronic exposure to 26°C resulted in mortality (Dickerson and Vinyard 1999).…”

Section: Discussionmentioning

confidence: 98%

Thermal ecology of juvenile steelhead in a warm-water environment

Spina

2006

Environ Biol Fish

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How salmonids adjust to the cost of chronic exposure to warm water in nature, particularly in habitats where areas of cold water are unavailable, is largely unknown. In the hot dry climate of southern California, oversummering juvenile steelhead, Oncorhynchus mykiss, can experience a continual warm-water environment. Studies were performed in three streams (34°N) during the summers of 2002-2004 to assess how steelhead (10-28 cm total length) exploit the thermal environment and to develop an understanding of how existing preference and heat tolerance information reported for the species relate to the actual temperatures the local population experiences. Analyses of achievable body temperatures, an index of observed body temperatures, and behavioral time budgets, indicate steelhead did not behaviorally thermoregulate. Findings from associated field surveys suggest areas of cold water were not available. Steelhead held focal points at temperatures (17.4-24.8°C) that were at times higher than the temperature preferences and heat tolerances reported for the species. Oversummering juvenile steelhead accept an elevated body temperature and remain active and forage throughout the day, apparently as a means for coping with warm water at the southern extent of their range. The relatively high body temperatures that steelhead accept appear to represent a compromise in exchange for maintaining an expanded geographic (latitudinal) range.

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Section: Discussionmentioning

confidence: 98%

Thermal ecology of juvenile steelhead in a warm-water environment

Spina

2006

Environ Biol Fish

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“…Nonetheless, the lack of difference in CTMax values suggests limited acclimatory plasticity (in accordance with Stillman and Somero 2000;Tomanek 2010) related to different habitats and no local adaptation in upper tolerance limits. There is mixed evidence in relation to intraspecific differences in ectothermic organisms coming from different environments (e.g., MacIsaac et al 1985;Smale and Rabeni 1995;Lohr et al 1996;Strange et al 2002;Winne and Keck 2005;Fangue et al 2006;Kelley et al 2011). It is possible that intraspecific differences due to latitude or habitat depend on how steep the thermal gradient is, leading or not to local adaptation of thermal tolerance.…”

Section: Discussionmentioning

confidence: 99%

Thermal tolerance of the crab Pachygrapsus marmoratus: intraspecific differences at a physiological (CTMax) and molecular level (Hsp70)

Madeira

Narciso

Cabral

et al. 2012

Cell Stress and Chaperones

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Temperature is one of the most important variables influencing organisms, especially in the intertidal zone. This work aimed to test physiological and molecular intraspecific differences in thermal tolerance of the crab Pachygrapsus marmoratus (Fabricius, 1787). The comparisons made focused on sex, size, and habitat (estuary and coast) differences. The physiological parameter was upper thermal limit, tested via the critical thermal maximum (CTMax) and the molecular parameter was total heat shock protein 70 (Hsp70 and Hsp70 plus Hsc70) production, quantified via an enzyme-linked imunosorbent assay. Results showed that CTMax values and Hsp70 production are higher in females probably due to different microhabitat use and potentially due to different hormonal regulation in males and females. Among females, non-reproducing ones showed a higher CTMax value, but no differences were found in Hsp70, even though reproducing females showed higher variability in Hsp70 amounts. As reproduction takes up a lot of energy, its allocation for other activities, including stress responses, is lower. Juveniles also showed higher CTMax and Hsp70 expression because they occur in greater shore heights and ageing leads to alterations in protein synthesis. Comparing estuarine and coastal crabs, no differences were found in CTMax but coastal crabs produce more Hsp70 than estuarine crabs because they occur in drier and hotter areas than estuarine ones, which occur in moister environments. This work shows the importance of addressing intraspecific differences in the stress response at different organizational levels. This study shows that these differences are key factors in stress research, climate research, and environmental monitoring.

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“…differing thermal environments and acclimated to common temperatures have thermal tolerance limits such that fish from cooler latitudes exhibit lower tolerance limits than their warmwater counterparts (Hart, 1952;McCauley, 1958;Otto, 1973;Fields et al, 1987;Lohr et al, 1996;Strange et al, 2002). On the other hand, some studies have failed to show thermal tolerance differences in populations from thermally contrasting environments (Brown and Feldmeth, 1971;Elliott et al, 1994;Smale and Rabeni, 1995).…”

Section: Introductionmentioning

confidence: 99%

Intraspecific variation in thermal tolerance and heat shock protein gene expression in common killifish,Fundulus heteroclitus

Fangue

Hofmeister

Schulte

2006

Journal of Experimental Biology

431

384

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SUMMARY Populations of common killifish, Fundulus heteroclitus, are distributed along the Atlantic coast of North America through a steep latitudinal thermal gradient. We examined intraspecific variation in whole-animal thermal tolerance and its relationship to the heat shock response in killifish from the northern and southern extremes of the species range. Critical thermal maxima were significantly higher in southern than in northern fish by ∼1.5°C at a wide range of acclimation temperatures (from 2-34°C), and critical thermal minima differed by ∼1.5°C at acclimation temperatures above 22°C, converging on the freezing point of brackish water at lower acclimation temperatures. To determine whether these differences in whole-organism thermal tolerance were reflected in differences in either the sequence or regulation of the heat shock protein genes(hsps) we obtained complete cDNA sequences for hsc70, hsp70-1 and hsp70-2, and partial sequences of hsp90α and hsp90β. There were no fixed differences in amino acid sequence between populations in either hsp70-1 or hsp70-2, and only a single conservative substitution between populations in hsc70. By contrast, there were significant differences between populations in the expression of many, but not all, of these genes. Both northern and southern killifish significantly increased hsp70-2 levels above control values(Ton) at a heat shock temperature of 33°C, but the magnitude of this induction was greater in northern fish, suggesting that northern fish may be more susceptible to thermal damage than are southern fish. In contrast, hsp70-1 mRNA levels increased gradually and to the same extent in response to heat shock in both populations. Hsc70 mRNA levels were significantly elevated by heat shock in southern fish, but not in northern fish. Similarly, the more thermotolerant southern killifish had a Ton for hsp90α of 30°C, 2°C lower than that of northern fish. This observation combined with the ability of southern killifish to upregulate hsc70 in response to heat shock suggests a possible role for these hsps in whole-organism differences in thermal tolerance. These data highlight the importance of considering the complexity of the heat shock response across multiple isoforms when attempting to make linkages to whole-organism traits such as thermal tolerance.

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High-Temperature Tolerances of Fluvial Arctic Grayling and Comparisons with Summer River Temperatures of the Big Hole River, Montana

Cited by 56 publications

References 13 publications

Thermal ecology of juvenile steelhead in a warm-water environment

Thermal ecology of juvenile steelhead in a warm-water environment

Thermal tolerance of the crab Pachygrapsus marmoratus: intraspecific differences at a physiological (CTMax) and molecular level (Hsp70)

Intraspecific variation in thermal tolerance and heat shock protein gene expression in common killifish,Fundulus heteroclitus

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