Prefeeding larval development time is not correlated with egg size in regular echinoids (Strongylocentrotusspecies)
作者:
LAUREN DICKIE,
MICHAEL HART,
RICHARD HELLING,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 1989)
卷期:
Volume 15,
issue 3
页码: 229-232
ISSN:0792-4259
年代: 1989
DOI:10.1080/07924259.1989.9672048
出版商: Taylor & Francis Group
关键词: Development time;echinoids;egg size;life histories;Strongylocentrotus
数据来源: Taylor
摘要:
We compared prefeeding development times, from fertilized egg to prism larva, forStrongylocentrotusembryos from four clutches of eggs (each from a different species) differing in size. Development times did not vary consistently with egg diameter, and trends among eggs of different sizes varied with stage of development. In some cases, development times for eggs of intermediate diameter (S. franciscanus) were longer than those for larger or smaller eggs. Although mean egg diameters in clutches ranged from 84 μm (S. purpuratus) to 162 μm (S. pallidus), differences in development time to the last embryonic stage (prism) were very small. We conclude that the inverse relationship between parental investment in offspring and premetamorphic development time in echinoids depends only on the functional consequences of reduced size of feeding larval stages: effects of egg size on prefeeding development time are not evident.
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