Larvae of the Coral Acropora tenuis (Dana 1846) Settle Under Controlled Light Intensity

MarSave International Symposium 2018: "Strengthening Marine Resilience for Sustainable Development Goals"

生态环境科学

Yusuf, S.^1 ; Zamani, N.P.^2 ; Jompa, J.^1 ; Junior, M.Z.^3

Marine Science Department, Faculty of Marine Sciences and Fisheries, Universitas Hasanuddin, Makassar, Indonesia^1

Bogor Agricultural University, Bogor, Indonesia^2

ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia^3

关键词: Asexual reproduction;    Coral reef restoration;    Horizontal substrates;    Laboratory conditions;    Morphological changes;    Settlement rate;    Sexual reproduction;    Substrate orientation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/253/1/012023/pdf
DOI  :  10.1088/1755-1315/253/1/012023

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Coral restoration using sexual reproduction could have many advantages over the currently more widely used asexual reproduction methods, in particular for maintaining genetic biodiversity. On-going research on controlled sexual reproduction of corals is seeking ways to achieve higher larval settlement and survival rates. Metamorphic settlement is a critical phase for the survival of coral larvae, due to morphological changes as well as threats of predation and competition. This study aimed to identify the effects of light intensity and substrate positioning on the metamorphosis of competent planula stage larvae. Five day old larvae of the Indo-Pacific coral Acropora tenuis (Dana 1846) were obtained from coral spawning under laboratory conditions. The light intensity experiments used 4 treatments: 170, 130, 90 and 45 μmol.m-2.s-1. Substrate positioning experiment treatments were vertical and horizontal orientations of the settlement plates. Coral larval settlement was not significantly correlated with light intensity, despite the higher settlement rates observed under light intensities between 130-170 μmol.m-2.s-1. The highest rate of settlement occurred on the ninth day post fertilisation and was significantly higher (α