Recruitment to the reef
column spacer Recruitment to the reef: sexual reproduction
 
 

Spawning, larval development, & dispersal of larvae

 
This section deals with spawning, larval development, & dispersal of larvae in sponges. The same topic for other reef organisms can be accessed via the icons. Other topics relating to recruitment, namely, SETTLEMENT & METAMORPHOSIS and SURVIVAL DURING EARLY LIFE, are found in their own sections. hot buttons for spawning/metamorphosis/dispersal section of BCCR website hot button for sponges section on spawning/metamorphosis/dispersal hot button for corals section on spawning/metamorphosis/dispersal hot button for snails section on spawning/metamorphosis/dispersal hot button for sea urchins & relatives section on spawning/metamorphosis/dispersal hot button for fishes section on spawning/metamorphosis/dispersal
 
 

Spawning, larval development, & dispersal of larvae: sponges

 
 
seahorse dive leader for Biology of Caribbean Coral Reefs website photograph of spawning tube-sponges taken from a video

"Well, what have we here? Some brown tube-sponges, and both sexes are spawning. The males are the smoking chimneys, while the females are spewing out a ropey substance containing eggs" - Florida 2002. Video courtesy James Constable, Florida 

NOTE Ageles conifera

 
 
photograph of giant sponge Xestospongia muta with eggs In Carrie Bow Cay, Belize, giant barrel sponges Xestospongia muta spawn in spring, with males and females releasing their gametes at the same time. Ritson-Williams et al. 2005 Coral Reefs 24: 160. Photographs courtesy the authors. photograph of giant sponge Xestospongia muta releasing sperm
Eggs of giant sponges Xestospongia muta are negatively buoyant   ...while sperm forms a diffuse cloud in the water column
 
 


photograph of a spawning sponge Ageles conifera, courtesy Anne Dupont, FloridaIn sponges, fertilisation of eggs occurs inside or outside the parent depending upon species. In brown tube-sponges Ageles conifera it occurs outside of the female sponge photograph of spawning sponge courtesy Anne Dupont, Floridaand, after 1-2d of development, the motile larvae hatch out and swim away. Photographs courtesy Anne Dupont, Florida.



Close view of the
eggs of a sponge 1X

 







Ropey egg-festoons of the brown
tube-sponge Agelas conifera 0.15X

 

diagram of spawning vase spongeThe larvae of sponges have flagella for locomotion, but are free-living for only a few moments. For this reason, recruitment is usually only a short distance from the parent.

After settlement, the larva metamorphoses, and within a few months has reached juvenile size of a few millimeters in height.

 
 

Not surprisingly, in view of the variability seen within invertebrate taxa, the above accounts present an almost too-simple picture of sponge reproduction. In fact, a species-by-species account reveals remarkable variable in spawning times and duration, and even in whether sexes are separate. The following information is based on a study done on 3 common species in Curacao. Hoppe 1988 Coral Reefs 7: 45. Photograph of Urcinia strobilina courtesy Geoff Schultz, U.S. GeoffSchultz'sBluejacketSailingSite.


 
photograph of black-ball sponge Urcinia strobilina photograph of touch-me-not sponge Neofibularia nolitangere photograph of orange elephant-ear sponge Ageles clathrodes


BLACK-BALL SPONGE Urcinia strobilina
• breeding Sept-Apr (8mo)
• sexes mostly separate
• viviparous (fertilisation internal, larvae released)


TOUCH-ME-NOT SPONGE Neofibularia nolitangere
• breeding season short (2mo)
• separate sexes
• population spawns synchronously
ORANGE ELEPHANT EAR SPONGE Agelas clathrodes
• breeding season short
• hermaphroditic
• eggs & sperm released synchronously
 
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