BIOLOGIJA, PONAŠANJE I ODNOS ŽRTVA - PREDATOR U VRSTE Sphedanolestes Variabilis Distant (INSECTA: HEMIPTERA: REDUVIIDAE: HARPACTORINAE), POTENCIJALNOGA PREDATORA ŠTETNIKA IZ REDA LEPIDOPTERA

Abstract

Sphedanolestes variabilis Distant laid light brown colour eggs singly as well as in small clusters of 5 to 10 eggs. The incubation period was 6.92±0.29 days. The stadial durations of I,II,III,IV and V instar nymphs were 6.83±0.58, 6.83±0.94, 6.58±1.56, 8.42±2.68 and 8.67±2.23 and 19.67±3.44 days respectively. Adult males and females lived for 93.83±13.04 and 102.83±12.69 days and their sex ratio was 1: 1 (male and female). The sequential acts of predation as well as that of mating conform to these of other harpactorine reduviids. S. variabilis exhibited Holling\u27s type II functional response as indicated by the positive correlation obtained between the prey density and the number of prey killed by the predator. The attack ratio decreased as the prey density was increased. A negative correlation was obtained between the searching time and the prey density.Sphedanolestes variabilis Distant odlaže jaja svijetlosmeđe boje pojedinačno ili u skupinama od 5 do 10 jaja. Inkubacijsko razdoblje traje 6,92 ± 0,29 dana. Razvojni stadiji I., II., III., IV. i V. faze nimfe jesu 6,83 ± 0,58, 6,83 ± 0,94, 6,58 ± 1,56, 8,42 ± 2,68 i 8,67 ± 2,23 i 19,67 ± 3,44 dana. Odrasli mužjaci i ženke živjeli su 93,83 ± 13,04 i 102,83 ± 12,69 dana, a omjer spolova bio je 1:1 (muški i ženski). Prema predatorstvu i parenju ta je vrsta u skladu s drugim vrstama iz porodice Readuviidae. Da bi se opisao odnos žrtva-plijen, korišten je model Holling tip II., koji je pokazao pozitivnu korelaciju između gustoće plijena i broja plijena ubijenih od predatora. Omjer napada smanjen je kako je gustoća plijena bila povećana. Negativna korelacija dobivena je između vremena pronalaska plijena i gustoće plijena