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guía práctica de experimentos para - Ecologia e Gestão Ambiental

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FOR ECOHYDROLOGY<br />

planctívoros (Hrbacek et al. 1961; Shapiro et al.<br />

1975), se pue<strong>de</strong> incrementar la <strong>de</strong>nsidad <strong>de</strong><br />

zooplancton <strong>de</strong> gran filtrado (Ej. cladóceros) y<br />

mejorar la calidad <strong>de</strong>l agua estancada (Figura<br />

1).<br />

2.Materiales y equipo<br />

a) Experimentos <strong>de</strong> campo<br />

• Red <strong>de</strong> jábega <strong>de</strong> playa <strong>de</strong> 10m <strong>de</strong> largo y150<br />

cm alto;<br />

• materiales y equipo <strong>para</strong> recoger muestras <strong>de</strong><br />

peces y muestras <strong>de</strong> zooplancton;<br />

• ropa: botas <strong>de</strong> agua y chaleco salvavidas.<br />

PERCH GROWTH RATE (G 103 PERCH GROWTH RATE (G 10 ) 3 )<br />

PIKEPERCH LENGTH (mm)<br />

24<br />

20<br />

16<br />

12<br />

8<br />

4<br />

92<br />

84<br />

76<br />

68<br />

60<br />

80<br />

60<br />

40<br />

20<br />

(N/m2)<br />

PERCH FRY DENSITY IN<br />

LITTORAL<br />

40<br />

30<br />

20<br />

10<br />

1983<br />

20 30 40<br />

AREA STABILITY INDEX (As)<br />

M A M J J A S OND<br />

MONTHS<br />

1983<br />

1990<br />

PISCIVOROUS<br />

NONPISCIVOROUS<br />

2 4 6 8 10 12 14<br />

54<br />

28<br />

24<br />

20<br />

16<br />

12<br />

8<br />

4<br />

1984<br />

M A M J J A S OND<br />

MONTHS<br />

1983 1984<br />

80<br />

60<br />

40<br />

20<br />

1984<br />

1991<br />

PISCIVOROUS<br />

NONPISCIVOROUS<br />

2 4 6 8 10 12 14<br />

GUÍA DE EXPERIMENTOS PRÁCTICOS PARA ECOHIDROLOGÍA<br />

Copepoda<br />

Cladocera<br />

10 20 30 40<br />

PERCH FRY DENSITY IN LITTORAL (Nm-2 10 20 30 40<br />

PERCH FRY DENSITY IN LITTORAL (Nm ) -2 )<br />

DISTANCE FROM THE DAM (km)<br />

b) Análisis <strong>de</strong> datos<br />

• or<strong>de</strong>nador;<br />

• hoja <strong>de</strong> organización <strong>de</strong> datos;<br />

• software <strong>de</strong> gráficos básicos.<br />

Información sobre seguridad<br />

Comprobar el pronóstico meteorológico antes <strong>de</strong><br />

ir al campo. Usar ropa a<strong>de</strong>cuada. No caminar<br />

sobre aguas profundas o entrar en un bote<br />

llevando las botas <strong>de</strong> agua. Tener cuidado <strong>de</strong> no<br />

tocar dispositivos eléctricos con las manos<br />

húmedas. Tener mucho cuidado al usar todos<br />

los equipos eléctricos.<br />

Depen<strong>de</strong>nce of perch<br />

reproductive success (fry<br />

<strong>de</strong>nsity in the littoral zone in<br />

mid-July) on water level stability<br />

Effect of low (up to 4 specimens<br />

per m2) and high (40 specimens<br />

per m2 Effect of low (up to 4 specimens<br />

per m<br />

) reproductive success of<br />

perch on zooplankton <strong>de</strong>nsity<br />

2) and high (40 specimens<br />

per m2 ) reproductive success of<br />

perch on zooplankton <strong>de</strong>nsity<br />

Threshold effect on zooplankton<br />

elimination by perch fry on<br />

perch growth rate<br />

(Instantaneous Coefficient of<br />

Growth) indicate minimum<br />

critical <strong>de</strong>nsity (12 mgl-2 Threshold effect on zooplankton<br />

elimination by perch fry on<br />

perch growth rate<br />

(Instantaneous Coefficient of<br />

Growth) indicate minimum<br />

critical <strong>de</strong>nsity (12 mgl-2 )<br />

Effect of sharp reduction of<br />

zooplankton by perch<br />

fry on growth and transition into<br />

piscivority the pike-perch<br />

fry and its winter survival (size<br />

<strong>de</strong>pen<strong>de</strong>nt). This in turn<br />

<strong>de</strong>termine cohort strength of<br />

pike-perch and control of other<br />

pelagic zooplanktivorous fish.<br />

Figura 1. El caso <strong>de</strong>l embalse Sulejow – la influencia <strong>de</strong> las inundaciones <strong>de</strong> la<br />

ribera en peces y zooplancton (datos extraídos <strong>de</strong> Zalewski et al. 1990a,<br />

1990b).<br />

78

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