Energy allocation in relation to spawning and overwintering of a diadromous Puyen (Galaxias maculatus) population in the southernmost limit of the species distribution.

BOY, CLAUDIA C.; PÉREZ, ANALÍA F.; FERNÁNDEZ, DANIEL A.; MORRICONI, ELBA R.; CALVO, JORGE

POLAR BIOLOGY

Spinger-Verlag

Lugar: Heidelberg; Año: 2009 vol. 32 p. 9 - 14

0722-4060

A population of Galaxias maculatus, a nativespecies in southern South America, living under cold-temperateconditions (0°C water temperature with an ice layercovering the stream during the coldest days) and 7 h oflight in winter undergoes high energetic demands in thepopulation studied. We analyzed the energy density ofgonads, liver, fat and muscle, through calorimetry for theWrst time in this species. Energy density of fat and liverwere extremely high (34.77?56.52 and 29.54?40.77 kJ/grespectively). While perivisceral fat reserves were likelyused for overwintering, liver and muscle reserves were usedfor reproduction. High energy densities were also found ingonads (27.76 kJ/g in ovaries and 25.84 kJ/g in testes).High investment in gonads of males suggests the presenceof sperm competition. The temporal variation of the energycontent of gonads, liver, fat and muscle indicates that theallocation of energy occurs by the internal transference ofenergy between organs and tissues. &amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/body&amp;amp;gt;&amp;amp;lt;/html&amp;amp;gt;&amp;lt;/div&amp;gt;&amp;lt;/body&amp;gt;&amp;lt;/html&amp;gt;&lt;/div&gt;&lt;/body&gt;&lt;/html&gt;</div></body></html>