Patterns of reproduction in two co-occurring Great Barrier Reef sponges

Wahab, Muhammad Azmi Abdul, De Nys, Rocky, Holzman, Ross, Schneider, Caroline Luise, and Whalan, Steve (2017) Patterns of reproduction in two co-occurring Great Barrier Reef sponges. Marine and Freshwater Research, 68 (7). pp. 1233-1244.

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Abstract

Reproduction is a key biological process that underpins the persistence and maintenance of populations. However, information on the reproductive biology of Great Barrier Reef (GBR) sponges is depauperate. The present study established the reproductive biology of two co-occurring GBR sponges, namely Ianthella basta (Verongida) and Ircinia sp. (Dictyoceratida). Sponges were haphazardly sampled (monthly) over a period of 1 year. Histological analysis of samples established the sexuality, development, seasonality, gametogenesis and fecundity of the two species, as well as the effects of temperature on reproduction. I. basta is oviparous, whereas Ircinia sp. is viviparous. The mode of sexuality in I. basta could not be determined, because male propagules were not detected, whereas Ircinia sp. is a simultaneous hermaphrodite. Reproduction in I. basta is unique within the verongids and co-occurring oviparous species, with peak reproduction occurring at the minimum annual temperature (23 degrees C) and spawning occurring as the temperature increased above 23.4 degrees C. Reproduction in Ircinia sp. corresponded to patterns reported for other viviparous GBR species, with an increase in reproductive propagules, peak sperm release, fertilisation and spawning occurring at temperatures above 25 degrees C. Fecundity in I. basta and Ircinia sp. is high compared with other sponge species in the region, which may contribute to their apparent abundance on the GBR.

Item ID: 50404
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: Ianthella basta, Ircinia sp., phenology, population dynamics, Porifera, temperature
Funders: James Cook University (JCU), Australian Institute of Marine Science at James Cook University (AIMS@JCU), Australian Research Council (ARC)
Projects and Grants: JCU Postgraduate Research Scholarship, AIMS@JCU shcolarship, ARC linkage Grant with Reef HQ LP0990664
Date Deposited: 20 Sep 2017 08:38
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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