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Isótopos estables y modelos de mezcla
Analizando los resultados
12.0
13.0
14.0
15.0
16.0
17.0
18.0
-20.00 -19.00 -18.00 -17.00 -16.00
δ15N
δ13C
CSL
Dosidicus gigas
Balistes polylepis
Pleuroncodes planipes
Argonauta spp.
Lagocephalus
lagocephalus
 Los datos se introducen en el modelo de mezcla propuesto por Phillips y
Gregg (2003)
Donde: A, B y C son las
presas, y pA + pB + pC es la
contribución de cada uno
al depredador.
 Estas ecuaciones se encuentran incluidas dentro de la rutina IsoSource
Analizando los resultados: Modelos de mezcla
 Los valores de isótopos pueden ser también introducidos en la rutina
SISUS desarrollada por Erhhardt (2008) , la cual tiene un aproximación
de tipo Bayesiana lo que permite trabajar con varias fuentes alimenticias
http://statacumen.com/sisus
 Esta aproximación permite determinar las distribuciones probabilísticas
de la contribución proporcional que cada fuente o presa aporta a una
mezcla o depredador
 El modelo también proporciona la oportunidad de incorporar la
información a priori para la contribución proporcional de cada fuente a
la mezcla.
 Eficiencia de asimilación
 Consumo
 Concentración
 Previamente al análisis se recomienda realizar agrupaciones de presas
 A los depredadores se les resta el valor de enriquecimiento de valor de
N antes de introducirlo a los modelos de mezcla
13.00
13.50
14.00
14.50
15.00
15.50
16.00
16.50
17.00
17.50
18.00
-17.00 -16.50 -16.00 -15.50 -15.00
d15N
d13C
Depredador
Presa a
Presa b
Presa c
Presa d
Presa e
0-22%
0-7%
72-92%
 Los modelos de mezcla nos dan como resultado una estimación de la
contribución que cada presa tiene a la dieta del depredador
Xant
Portp
Port
 http://statacumen.com/sisus/
NT=
λes la posición trófica del organismo usado para
estimar δ15Nbase
Λes el enriquecimiento en 15N por nivel trófico
Analizando los resultados: Nivel trófico
El organismo base debe
ser un organismo que se
encuentre en el medio y
sea relativamente común
encontrarlo en la dieta
 Si se cuenta con suficiente información puede representarse una red trófica
Existen otros software dentro de los que destacan también el llamado
IsoSource
Sin embargo este presenta la
limitación de que solo trabaja con
10 especies presa

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Clase sisus

  • 1. Isótopos estables y modelos de mezcla
  • 2. Analizando los resultados 12.0 13.0 14.0 15.0 16.0 17.0 18.0 -20.00 -19.00 -18.00 -17.00 -16.00 δ15N δ13C CSL Dosidicus gigas Balistes polylepis Pleuroncodes planipes Argonauta spp. Lagocephalus lagocephalus
  • 3.  Los datos se introducen en el modelo de mezcla propuesto por Phillips y Gregg (2003) Donde: A, B y C son las presas, y pA + pB + pC es la contribución de cada uno al depredador.  Estas ecuaciones se encuentran incluidas dentro de la rutina IsoSource Analizando los resultados: Modelos de mezcla
  • 4.  Los valores de isótopos pueden ser también introducidos en la rutina SISUS desarrollada por Erhhardt (2008) , la cual tiene un aproximación de tipo Bayesiana lo que permite trabajar con varias fuentes alimenticias http://statacumen.com/sisus
  • 5.  Esta aproximación permite determinar las distribuciones probabilísticas de la contribución proporcional que cada fuente o presa aporta a una mezcla o depredador  El modelo también proporciona la oportunidad de incorporar la información a priori para la contribución proporcional de cada fuente a la mezcla.  Eficiencia de asimilación  Consumo  Concentración
  • 6.  Previamente al análisis se recomienda realizar agrupaciones de presas
  • 7.  A los depredadores se les resta el valor de enriquecimiento de valor de N antes de introducirlo a los modelos de mezcla 13.00 13.50 14.00 14.50 15.00 15.50 16.00 16.50 17.00 17.50 18.00 -17.00 -16.50 -16.00 -15.50 -15.00 d15N d13C Depredador Presa a Presa b Presa c Presa d Presa e
  • 8. 0-22% 0-7% 72-92%  Los modelos de mezcla nos dan como resultado una estimación de la contribución que cada presa tiene a la dieta del depredador Xant Portp Port
  • 10.
  • 11.
  • 12.
  • 13. NT= λes la posición trófica del organismo usado para estimar δ15Nbase Λes el enriquecimiento en 15N por nivel trófico Analizando los resultados: Nivel trófico El organismo base debe ser un organismo que se encuentre en el medio y sea relativamente común encontrarlo en la dieta
  • 14.  Si se cuenta con suficiente información puede representarse una red trófica
  • 15. Existen otros software dentro de los que destacan también el llamado IsoSource Sin embargo este presenta la limitación de que solo trabaja con 10 especies presa