Variation in stable-isotope ratios between fin and muscle tissues can alter assessment of resource use in tropical river fishes.
J Fish Biol
; 91(2): 574-586, 2017 Aug.
Article
em En
| MEDLINE
| ID: mdl-28776705
ABSTRACT
Carbon and nitrogen stable-isotope ratios were compared of fin and muscle tissue from 15 fish species collected from seven headwater rivers in eastern and western Thailand. In addition, two-source stable-isotope mixing models were used to derive estimates of each fish's reliance on allochthonous and autochthonous energy based on fin and muscle tissues. Across the dataset, fish fin was enriched in 13 C relative to muscle by c. 1·5. Variation in δ15 N between tissues was below statistically significant levels. Estimates of autochthonous resource use calculated from fin tissue were on average 15% greater than those calculated from muscle. Linear mixed-effects models indicated that inter-tissue variation in estimates of resource use was predominantly related to inter-tissue variation in δ13 C. Fish fin is a credible and desirable alternative to tissues such as muscle or liver which require destructive sampling of fishes. Care must be taken, however, when estimating resource use or interpreting previous estimates of resource use derived from different tissues.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Isótopos de Carbono
/
Rios
/
Nadadeiras de Animais
/
Peixes
/
Músculos
/
Isótopos de Nitrogênio
Limite:
Animals
País/Região como assunto:
Asia
Idioma:
En
Revista:
J Fish Biol
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Canadá