Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of Experimental Biology |
| Vol/bind | 206 |
| Udgave nummer | Pt 2 |
| Sider (fra-til) | 359-64 |
| Antal sider | 5 |
| ISSN | 0022-0949 |
| Status | Udgivet - 2003 |
Bibliografisk note
Keywords: Acclimatization; Alleles; Animals; Anoxia; Atlantic Ocean; Climate; Fishes; Gene Frequency; Genotype; Hemoglobins; Oxygen; Seawater; TemperatureBiblioteksadgang?
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I: Journal of Experimental Biology, Bind 206, Nr. Pt 2, 2003, s. 359-64.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Preferred temperature of juvenile Atlantic cod Gadus morhua with different haemoglobin genotypes at normoxia and moderate hypoxia.
AU - Petersen, Maria Faldborg
AU - Steffensen, John Fleng
N1 - Keywords: Acclimatization; Alleles; Animals; Anoxia; Atlantic Ocean; Climate; Fishes; Gene Frequency; Genotype; Hemoglobins; Oxygen; Seawater; Temperature
PY - 2003
Y1 - 2003
N2 - Atlantic cod Gadus morhua has polymorphic haemoglobin, which can be separated into two homozygous types, HbI-1 and HbI-2, and one heterozygous type HbI-1/2. The geographical distribution of Atlantic cod with the different haemoglobin types varies, with the HbI(2) allele occurring at high frequency in northern regions, and the HbI(1) allele dominant in warmer areas. To determine if temperature is a selective parameter in the distribution of the haemoglobin types, the preferred temperature of the homozygous genotypes HbI-1 and HbI-2 was measured. We found that HbI-2 cod preferred a temperature of 8.2+/-1.5 degrees C while HbI-1 cod preferred 15.4+/-1.1 degrees C, and this preference was significant. The effect of hypoxia (35% oxygen saturation) on the preferred temperature was also measured. Previous studies showed that the preferred temperature of fish decreases during hypoxia, and this was the case for HbI-1 cod, which preferred 9.8+/-1.8 degrees C during hypoxia, whereas HbI-2 cod did not show this effect. The results indicate that environmental temperature changes will lead to a distributional change in the different haemoglobin types of Atlantic cod, global warming providing an advantage for HbI-1 cod. However, since HbI-1 cod prefer a low temperature under hypoxic conditions, a combination of increased water temperature and hypoxia could be unfavourable for Atlantic cod stocks.
AB - Atlantic cod Gadus morhua has polymorphic haemoglobin, which can be separated into two homozygous types, HbI-1 and HbI-2, and one heterozygous type HbI-1/2. The geographical distribution of Atlantic cod with the different haemoglobin types varies, with the HbI(2) allele occurring at high frequency in northern regions, and the HbI(1) allele dominant in warmer areas. To determine if temperature is a selective parameter in the distribution of the haemoglobin types, the preferred temperature of the homozygous genotypes HbI-1 and HbI-2 was measured. We found that HbI-2 cod preferred a temperature of 8.2+/-1.5 degrees C while HbI-1 cod preferred 15.4+/-1.1 degrees C, and this preference was significant. The effect of hypoxia (35% oxygen saturation) on the preferred temperature was also measured. Previous studies showed that the preferred temperature of fish decreases during hypoxia, and this was the case for HbI-1 cod, which preferred 9.8+/-1.8 degrees C during hypoxia, whereas HbI-2 cod did not show this effect. The results indicate that environmental temperature changes will lead to a distributional change in the different haemoglobin types of Atlantic cod, global warming providing an advantage for HbI-1 cod. However, since HbI-1 cod prefer a low temperature under hypoxic conditions, a combination of increased water temperature and hypoxia could be unfavourable for Atlantic cod stocks.
M3 - Journal article
C2 - 12477905
SN - 0022-0949
VL - 206
SP - 359
EP - 364
JO - Journal of Experimental Biology
JF - Journal of Experimental Biology
IS - Pt 2
ER -