| cellular origin of chlorinated diketopiperazines in the dictyoceratid sponge dysidea herbacea (keller). | the tropical marine sponge dysidea herbacea (keller) contains the filamentous unicellular cyanobacterium oscillatoria spongeliae (schulze) hauck as an endosymbiont, plus numerous bacteria, both intracellular and extracellular. archaeocytes and choanocytes are the major sponge cell types present. density gradient centrifugation of glutaraldehyde-fixed cells with percoll as the support medium has been used to separate the cyanobacterial symbiont from the sponge cells on the basis of their differin ... | 1998 | 9582417 |
| speciation and biosynthetic variation in four dictyoceratid sponges and their cyanobacterial symbiont, oscillatoria spongeliae. | four species of marine sponges (phylum porifera, order dictyoceratida), which contain the filamentous cyanobacterial symbiont oscillatoria spongeliae, were collected from four locations in palau. the halogenated natural products associated with the symbiont were characterized from each sample, revealing that each species contained either chlorinated peptides, brominated diphenyl ethers, or no halogenated compounds. analysis of the host sponges and the symbionts indicated that each species of spo ... | 2005 | 15797223 |
| investigation of oscillatoria spongeliae-dominated bacterial communities in four dictyoceratid sponges. | certain species of marine sponges in the order dictyoceratida harbor large populations of the cyanobacterial symbiont oscillatoria spongeliae in the mesohyl (interior) of the sponge. we show that in four of these sponge species (lamellodysidea herbacea, lamellodysidea chlorea, lendenfeldia chondrodes, and phyllospongia papyracea) from palau there is a consistent community of alpha-proteobacteria in addition to o. spongeliae that fall within the rhodobacter group based on 16s rrna gene analysis. ... | 2005 | 16269779 |
| diversity and abundance of photosynthetic sponges in temperate western australia. | photosynthetic sponges are important components of reef ecosystems around the world, but are poorly understood. it is often assumed that temperate regions have low diversity and abundance of photosynthetic sponges, but to date no studies have investigated this question. the aim of this study was to compare the percentages of photosynthetic sponges in temperate western australia (wa) with previously published data on tropical regions, and to determine the abundance and diversity of these associat ... | 2009 | 19196460 |
| impacts of shading on sponge-cyanobacteria symbioses: a comparison between host-specific and generalist associations. | the marine sponge lamellodysidea chlorea contains large populations of the host-specific, filamentous cyanobacterium oscillatoria spongeliae. other marine sponges, including xestospongia exigua, contain the generalist, unicellular cyanobacterium synechococcus spongiarum. the impact of cyanobacterial photosynthesis on host sponges was manipulated by shading these sponge-cyanobacteria associations. if cyanobacteria benefit their hosts, shading should reduce this benefit. chlorophyll a concentratio ... | 2005 | 21676782 |