Journal
ECOLOGICAL RESEARCH
Volume 29, Issue 6, Pages 1025-1032Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s11284-014-1188-4
Keywords
Egg period; Hatching rate; Megacrania tsudai; Salinity tolerance; Seawater dispersal
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Funding
- Takeshi Sasaki of The University Museum (Fujukan)
- University of the Ryukyus
- 'International Research Hub Project for Climate Change and Coral Reef/Island Dynamics' from University of the Ryukyus
- KAIGIN Environment Fund
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Although insects expand their distribution by various ways, generally only the adult phase has been taken into consideration in research on dispersal. In Megacrania tsudai, it has been proposed that eggs are dispersed through seawater. To test this hypothesis, eggs were treated under normal condition (NC) on wet cotton swabs, and marine condition (MC), floating on salt water for 30, 60, 90, and 365 days. In addition, eggs in the NC and MC treatment groups were dissected every 10 days to verify the developmental stage. The hatching rates in the NC and MC treatment groups were not significantly different among the five treatment groups. However, the egg period, time from laying to hatching, in the MC treatment group was significantly longer than that in any other treatment groups. The egg period was lengthened when the floating period on seawater was longer. The time of the start of egg development was similar in the NC and MC treatment groups, but the developmental speed was slower in the MC treatment group. These results support that M. tsudai can expand its distribution by dispersing its eggs through seawater, probably thanks to specific characteristics of eggs that allow their survival when they float in the sea.
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