Cytogenetics of predatory orb- weaver Neoscona nautica (C.L.Koch) (Araneae : Araneidae) sampled from a corn field at Brgy. Lagalag, Tiaong, Quezon.

Date

4-2006

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Among the spiders collected in July, 2005 from the corn fields of Brgy. Lagalag, Tiaong, Quezon, are: Neoscona sp near Scylla (Karsch), Zosis genicalatas (Olivier), Neoscona sp., N. molemensis (Bal & Tikader), Cyclosa insulana (Costa) and Neoscona nautica (C.L. Koch), the latter was found to be the predominant species. The cytogenetics of the predatory orb-weaver N. minim was determined through lacto-aceto-orcein squash technique of the eggs fixed with Farmer's solution. The diploid chromosome number (2n) is 22. The different mitotic stages were observed and described. The different mitotic stages, namely: Prophase, Metaphase, Anaphase, and Telophase, were observed. The most frequently occurring stage is the Prophase with a mean frequency of 69 %. The least occurring stage is the Telophase with a mean frequency of 3 %. There were no structural or chromosomal aberrations encountered. The mean mitotic index was 84 76%. The average chromosome lengths ranged from 9.3 to 26.6 mm. The relative mean lengths ranged from 0.052 to 0.149

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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