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Journal Cover Conservation Physiology
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  This is an Open Access Journal Open Access journal
   ISSN (Online) 2051-1434
   Published by Oxford University Press Homepage  [363 journals]
  • Corticosterone, inflammation, immune status and telomere length in
           frigatebird nestlings facing a severe herpesvirus infection

    • Authors: Sebastiano, M; Eens, M, Angelier, F, Pineau, K, Chastel, O, Costantini, D.
      Abstract: Herpesvirus outbreaks are common in natural animal populations, but little is known about factors that favour the infection and its consequences for the organism. In this study, we examined the pathophysiological consequences of a disease probably attributable to herpesvirus infection for several markers of immune function, corticosterone, telomere length and inflammation. In addition, we assessed whether any markers used in this study might be associated with the occurrence of visible clinical signs of the disease and its impact on short-term survival perspectives. To address our questions, in spring 2015, we collected blood samples from nestlings of the magnificent frigatebird (Fregata magnificens) that were free of any clinical signs or showed visible signs of the disease. We found that the plasma concentration of haptoglobin was strongly associated with the infection status and could predict probabilities of survival. We also found that nestlings with clinical signs had lower baseline corticosterone concentrations and similar telomere length compared with healthy nestlings, whereas we did not find any association of the infection status with innate immune defenses or with nitric oxide concentration. Overall, our results suggest that the plasma concentration of haptoglobin might be a valuable tool to assess survival probabilities of frigatebird nestlings facing a herpesvirus outbreak.
      PubDate: 2017-01-04T07:31:22-08:00
      DOI: 10.1093/conphys/cow073
      Issue No: Vol. 5, No. 1 (2017)
       
  • Reflections and progress in conservation physiology

    • Authors: Cooke, S. J; Hultine, K. R, Rummer, J. L, Franklin, C. E.
      PubDate: 2017-01-04T07:31:22-08:00
      DOI: 10.1093/conphys/cow071
      Issue No: Vol. 5, No. 1 (2017)
       
  • Unusual aerobic performance at high temperatures in juvenile Chinook
           salmon, Oncorhynchus tshawytscha

    • Authors: Poletto, J. B; Cocherell, D. E, Baird, S. E, Nguyen, T. X, Cabrera-Stagno, V, Farrell, A. P, Fangue, N. A.
      Abstract: Understanding how the current warming trends affect fish populations is crucial for effective conservation and management. To help define suitable thermal habitat for juvenile Chinook salmon, the thermal performance of juvenile Chinook salmon acclimated to either 15 or 19°C was tested across a range of environmentally relevant acute temperature changes (from 12 to 26°C). Swim tunnel respirometers were used to measure routine oxygen uptake as a measure of routine metabolic rate (RMR) and oxygen uptake when swimming maximally as a measure of maximal metabolic rate (MMR) at each test temperature. We estimated absolute aerobic scope (AAS = MMR – RMR), the capacity to supply oxygen beyond routine needs, as well as factorial aerobic scope (FAS = MMR/RMR). All fish swam at a test temperature of 23°C regardless of acclimation temperature, but some mortality occurred at 25°C during MMR measurements. Overall, RMR and MMR increased with acute warming, but aerobic capacity was unaffected by test temperatures up to 23°C in both acclimation groups. The mean AAS for fish acclimated and tested at 15°C (7.06 ± 1.76 mg O2 kg–1 h–1) was similar to that measured for fish acclimated and tested at 19°C (8.80 ± 1.42 mg O2 kg–1 h–1). Over the entire acute test temperature range, while MMR and AAS were similar for the two acclimation groups, RMR was significantly lower and FAS consequently higher at the lower test temperatures for the fish acclimated at 19°C. Thus, this stock of juvenile Chinook salmon shows an impressive aerobic capacity when acutely warmed to temperatures close to their upper thermal tolerance limit, regardless of the acclimation temperature. These results are compared with those for other salmonids, and the implications of our findings for informing management actions are discussed.
      PubDate: 2017-01-04T07:31:22-08:00
      DOI: 10.1093/conphys/cow067
      Issue No: Vol. 5, No. 1 (2017)
       
 
 
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