ISSN:
1573-5117
Keywords:
phototaxis
;
vertical migration
;
temporary pools
;
Anostraca
;
Streptocephalus
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The phototactic behaviour of adults of the Sudanese fairy shrimpStreptocephalus probiscideus was studied under laboratory conditions. Males were less negatively phototactic than females. This was also evident when colour filters were used. females only became little less negatively phototactic under yellow light, whereas males showed a strong positively phototactic response. The response to the positioning of a yellow filter was stronger than to the use of a red or blue filter for both sexes. The laboratory findings were compared with casual field observations onStreptocaphalus torvicornis that indicate differential vertical distribution between the sexes and a nocturnal vertical migration. Migratory behaviour with ascent starting at dusk is also predicted forS. proboscideus. This behaviour may reduce common stress factors in desert pools such as photodamage, visual predation pressure, and high surface temperatures.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00033803
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