A thermogenic secondary sexual character in male sea lamprey
| Autor: | Ke Li, Weiming Li, M. Cody Priess, Mara B. Bryan, Yu Wen Chung-Davidson, Kaben G. Nanlohy, Chu Yin Yeh, C. Titus Brown, Jongeun Choi, Nicholas S. Johnson, Cory O. Brant |
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| Rok vydání: | 2013 |
| Předmět: |
Male
medicine.medical_specialty Physiology Adipose tissue Aquatic Science Biology Mitochondrion Real-Time Polymerase Chain Reaction Gas Chromatography-Mass Spectrometry Electron Transport Complex IV Sexual Behavior Animal Adenosine Triphosphate Microscopy Electron Transmission Internal medicine Lipid droplet medicine Animals Petromyzon Molecular Biology Phylogeny Research Articles Ecology Evolution Behavior and Systematics Sex Characteristics Lamprey Fatty Acids Thermogenesis Fat cell differentiation biology.organism_classification Immunohistochemistry Endocrinology Adipose Tissue Gene Expression Regulation Insect Science Sexual selection Animal Science and Zoology Transcriptome |
| Zdroj: | Journal of Experimental Biology. 216:2702-2712 |
| ISSN: | 1477-9145 0022-0949 |
| DOI: | 10.1242/jeb.085746 |
| Popis: | SUMMARY Secondary sexual characters in animals are exaggerated ornaments or weapons for intrasexual competition. Unexpectedly, we found that a male secondary sexual character in sea lamprey (Petromyzon marinus) is a thermogenic adipose tissue that instantly increases its heat production during sexual encounters. This secondary sexual character, developed in front of the anterior dorsal fin of mature males, is a swollen dorsal ridge known as the ‘rope’ tissue. It contains nerve bundles, multivacuolar adipocytes and interstitial cells packed with small lipid droplets and mitochondria with dense and highly organized cristae. The fatty acid composition of the rope tissue is rich in unsaturated fatty acids. The cytochrome c oxidase activity is high but the ATP concentration is very low in the mitochondria of the rope tissue compared with those of the gill and muscle tissues. The rope tissue temperature immediately rose up to 0.3°C when the male encountered a conspecific. Mature males generated more heat in the rope and muscle tissues when presented with a mature female than when presented with a male (paired t-test, P |
| Databáze: | OpenAIRE |
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