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Phototactic Response of Two Spotted Cricket (Gryllus bimaculatus De Geer) to Electric Bulb Light Colours and Types

Chukwu A. Timothy

,

Okrikata Emmanuel

Chukwu A. Timothy 1 Okrikata Emmanuel 1 ,
;

  1. Department of Biological Sciences, Faculty of Pure and Applied Sciences, Federal University Wukari, Taraba State, Nigeria. 1

Pages: 66-72

DOI: 10.18488/journal.70.2020.72.66.72

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Article History:

Received: 11 November, 2019
Revised: 19 December, 2019
Accepted: 22 January, 2020
Published: 26 February, 2020


Abstract:

This study examined the phototactic response of two spotted cricket (G. bimaculatus) to incandescent and LED bulb light of different colours. Light traps fitted with 25 Watts incandescent bulbs and 3 Watts Light Emitting Diode (LED) of different colours (red, yellow, green, blue and white) were used. Also included was a control trap. The traps were operated from 1800hr to 2400hr. G. bimaculatus collected were counted and the data subjected to variance analysis. Student Newman Keul’s test was used to separate significantly different means at 5% level of probability. Relationship between light intensity and insect density was assessed by correlation and linear regression analysis. Results indicated that LED had higher mean intensity despite lower wattage and that, Blue colour had the highest mean intensity (736.80 Lux) among the LEDs and white (1094.20 Lux) among the incandescent bulbs. Statistical analysis showed that differences in attractiveness among LED bulb colours were due to random variation (p = 0.17); however was significant (p < 0.001) among incandescent bulbs. Of the total G. bimaculatus collected attracted, 93.7% was by LED bulbs with blue LED bulb alone attracting 57.1%. Light intensity was positively and significantly correlated with density of G. bimaculatus attracted for both LED (r = 0.92, R2 = 84.4%) and incandescent (r = 0.96, R2 = 92.5%) bulbs. Higher attraction of G. bimaculatus to blue coloured LED bulbs could be attributed to preference and/or high light intensity. Blue LED bulbs of higher intensity can thus be used to manipulate G. bimaculatus for man’s benefit.
Contribution/ Originality
The study is one of few that investigated the phototactic response of G. bimaculatus to electric light type and colours. This information is necessary in manipulating the insect’s directional movement behaviour for the benefit of man.

Keywords:

Bulb light, G. bimaculatus, Incandescent bulb, LED bulb, Light colour, Light intensity, Phototactic, Preference.

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Reference:

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Funding:

This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.

Acknowledgement:

This study is part of a Project leading to the award of a Degree in Biology of Federal University, Wukari, Nigeria. Sincere thanks to Samaila Nuhu and Stephen Yakubu for their support during the field work. The expertise of Mr. Ishaku Musa of the Insect Museum of Institute of Agricultural Research (IAR) in Ahmadu Bello University, Zaria, Nigeria in identifying the insect samples is well appreciated. Sincere gratitude also, to Mr. Adeniyi Ogunmola of Mathematics and Statistics Department, Federal University, Wukari for running the data analyses.

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