Larval activity levels and delayed metamorphosis affect post-larval performance in the colonial, ascidian Diplosoma listerianum

Marshall, D. J., Pechenik, J. A. and Keough, M. J. (2003) Larval activity levels and delayed metamorphosis affect post-larval performance in the colonial, ascidian Diplosoma listerianum. Marine Ecology-Progress Series, 246 153-162. doi:10.3354/meps246153


Author Marshall, D. J.
Pechenik, J. A.
Keough, M. J.
Title Larval activity levels and delayed metamorphosis affect post-larval performance in the colonial, ascidian Diplosoma listerianum
Journal name Marine Ecology-Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2003
Sub-type Article (original research)
DOI 10.3354/meps246153
Open Access Status DOI
Volume 246
Start page 153
End page 162
Total pages 10
Place of publication Oldendorf, Germany
Publisher Inter-Research
Language eng
Abstract It is becoming widely recognized that extending the larval period of marine invertebrates, especially of species with non-feeding larvae, can affect post-larval performance. As these carry-over effects are presumed to be caused by the depletion of larval energy reserves, we predicted that the level of larval activity would also affect post-larval performance. This prediction was tested with the cosmopolitan colonial ascidian Diplosoma listerianum in field experiments in southern Australia. Diplosoma larvae, brooded in the parent colony, are competent to settle immediately after spawning, and they remain competent to metamorphose for > 15 h. Some larvae were induced to metamorphose 0 to 6 h after release, whilst others were induced to swim actively by alternating light and dark periods for up to 3 h prior to metamorphosis. Juvenile colonies were then transplanted to a subtidal field site in Port Phillip Bay and left to grow for up to 3 wk. Extending the larval period and increasing the amount of swimming both produced carry-over effects on post-larval performance. Colonies survived at different rates among experiments, but larval experience did not affect survival rates. Delays in metamorphosis and increased swimming activity did, however, reduce colony growth rates dramatically, resulting in 50% fewer zooids per colony. Moreover, such colonies produced initial zooids with smaller feeding structures, with the width of branchial baskets reduced by 10 to 15%. These differences in branchial basket size persisted and were still apparent in newly budded zooids 3 wk after metamorphosis. Our results suggest that, for D. listerianum, larval maintenance, swimming, and metamorphosis all use energy from a common pool, and increases in the allocation to maintenance or swimming come at the expense of post-larval performance.
Keyword Ecology
Marine & Freshwater Biology
Oceanography
Delayed Metamorphosis
Ascidian
Carry-over Effects
Larvae
Settlement
Gastropod Crepidula-fornicata
Bugula-neritina Bryozoa
Marine-invertebrates
Swimming Duration
Competence
Dispersal
Populations
Induction
Growth
Life
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Mon, 13 Aug 2007, 13:25:13 EST