Life history characteristics of brown trout in lakes at different stages of acidification

Autor:	B. Jonsson, T. Hesthagen
Rok vydání:	2002
Předmět:	Ecology Allopatric speciation Environmental factor Zoology Aquatic Science Biology biology.organism_classification medicine.disease_cause Brown trout Abundance (ecology) medicine Sexual maturity Salmo Relative species abundance Ecology Evolution Behavior and Systematics Salmonidae
Zdroj:	Journal of Fish Biology. 60:415-426
ISSN:	1095-8649 0022-1112
Popis:	In 66 Norwegian lakes with allopatric populations of brown trout Salmo trutta that ranged from highly acidified to non-acid (pH 4.7-6.6) there was a significant inverse correlation between mean age and relative abundance (CPUE). As mean annual survival rates were not significantly related to CPUE, this population response may indicate that recruitment was lower in low-density lakes. Age-specific masses were significantly higher in populations that had declined in abundance than in unaffected populations. Mean body mass at sexual maturity in both males and females was inversely correlated with CPUE. Between populations, high age at maturity was associated with high survival rates in both sexes. Age at maturity correlated positively with specific growth rate between the ages of 1 and 2 years in females only.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3fcaaf0eae20edcf9ab4049cc65f0956 https://doi.org/10.1111/j.1095-8649.2002.tb00290.x Zobrazit plný text záznamu Plný text