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Mating and phototaxis in the wood ant, Formica lugubris ZETT. [Hymenoptera, Formicidae]

100%

Fortelius W.

Memorabilia Zoologica

1994

tom 48

69-80

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Rola plamek oczoksztaltnych u pijawek pasozytniczych [Hirudinea, Piscicolidae] w odszukiwaniu ryb-zywicieli

100%

Bielecki A.

Wiadomości Parazytologiczne

1999

tom 45

nr 3

339-345

Piscicola geometra (L.), Piscicola respirans Troschel, 1850, and Caspiobdella fadejewi (Epshtein, 1968) find their hosts (fishes) by reacting to their shadow. Eye-like spots whose number ranges from 8 to 16 depending on a species, located on the posterior sucker are the main receptors perceiving the decrease in light intensity and thus enabling an immedaite reaction to the host's shadow. They are distributed on the perimeter of the sucker, are absent only from the section that is constantly shaded by the leech body. Experiments with a simulated shadow reveled considerable differences in the threshold light doses between the studied species: P. geometra- 12 lux, P. resprans - 4 lux and C. fadejewi-2.5 lux. Below these values the leeches do not perceive the decrease in light intensity and do not make host-searching movements. The smallest decreases in light intensity, at which the leeches still make host-searching movement, are: P. geometra - 5 lux, P. resprans - 2 lux, and C. fadejewi - 1.5 lux. In case of P. respirans and C. fadejewi such small decreases in light intensity (2-1.5 lux) may be caused only by small fishes which, according to the results of the experiment, should not be infested. This is confirmed by field observations - small fishes are mostly free from parasites. Large fishes (casting a large shadow) have much more numerous leeches.

Taksja

80%

Kostuch R.

Doradca. Galicyjski Magazyn Rolniczy

2000

nr 94

26-27

Roslinne zegary

50%

Slomczynska A.

Działkowiec

2006

nr 08

8-9

Ograniczanie wyników

1 Doradca. Galicyjski Magazyn Rolniczy

1 Działkowiec

1 Memorabilia Zoologica

1 Wiadomości Parazytologiczne

1 Bielecki A.

1 Fortelius W.

1 Kostuch R.

1 Slomczynska A.

1 2006

1 2000

1 1999

1 1994

Wyniki wyszukiwania

Mating and phototaxis in the wood ant, Formica lugubris ZETT. [Hymenoptera, Formicidae]

Rola plamek oczoksztaltnych u pijawek pasozytniczych [Hirudinea, Piscicolidae] w odszukiwaniu ryb-zywicieli

Taksja

Roslinne zegary