Morphometrics and cytogenetics of the male oriental fruit fly, Bactrocera dorsalis (Hendel)

Date

10-2001

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Length measurement of the five abdominal characters associated with reproduction in male oriental fruit fly, Bacrtocera dorsalis (Hendel) namely: pygofer, subgenital plate, aedeagus. paramere and connective were examined and statistically compared. The length dimensions range from 0.27 to 0.36 mm. Majority of the male B. dorsalis exhibited 0.30 mm length in the pygofer (38%), subgenital plate (36%), aedeagus (34%) and paramere (30%), except for the connective wherein 32% had 0.33 mm measurement. The parameter ratio was also determined to express the shape of the structure by finding the proportion of one dimension of structure to another. Only seven male B. dorsalis exhibited perfect proportion (1:1:1:1:1) with respect to the five abdominal characters examined. Cytogenetic analysis of the testicular cells of B. dorsalis revealed that meiosis, consisting of reductional and equational divisions was normal in sonic. Others exhibit an aberration in Anaphase I illustrating bridge formation. The average meiotic index of male B. dorsalis was 51.37%. Karyotype analysis of Metaphase I chromosomes revealed that the diploid chromosome number of B. dorsalis was 2n=12, consisting of five pairs of monocentric autosomes and one pair of heteromorphic sex chromosomes (XY in males). Average relative lengths of chromosomes range from 0.045-0.114.

Morphometric and cytogenetic variations among the individual members of the sympatric local population of male B. were determined and compared using Friedman's Test and One-Way Analysis of Variance (ANOVA), respectively. The morphometric data showed that computed X2 (6.47672) is less than the tabulated of X2 at 5%, 2.5% and 1% level of significance, indicating that the distributions of the length of the five abdominal characters are the same across 50 repeated. Likewise, the computed value of F(7.5 x 104) in the analysis relative lengths of chromosomes is less than the value of tabulated F at 5% level of significance suggesting that there is no significant differences among the individuals of local population of male B dorsalis.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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