More Resources About Sponges
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Monterey Bay Aquarium Research Institute (MBARI) scientists discovered new carnivorous sponges: Four new species of carnivorous sponges: Adapting to life in the deep sea.
Monterey Bay Aquarium Research Institute (MBARI) discovers a new species: The harp sponge: an extraordinary new species of carnivorous sponge.
CreatureCast - The Unexpected World of Biology: This video illustrates in animation how multicelluarity works - Multicellularity.
Extract from the BBC 's "First Life" Documentary: Sponge Reaggregation". Sponge cells can recombine after being separated into separate cells.
CLIMATE CHANGE AND OCEAN ACIDIFICATION
Effects of ocean acidification and temperature rise on the boring rates of spongesWatch this video about a scientist who studies the effect of ocean acidification on boring sponges.
ORIGINS Animal Eve: Sponges
GENERAL INFORMATION ABOUT SPONGES
National Geographic article about sponges in the Shape of Life: Was The Humble Sponge Earth's First Animal?
Description of sponges with illustrations: Sponges - The Simplest Animals.
All about sponges: Ocean Animals - Sponges from the Missouri Botanical Garden.
Sponges have a very complex microbiome—a community of microorganisms—and each species has a very distinct set of microorganisms: Different Sponge Species Have Highly Specific and Stable Microbiomes from The Marine Biological Laboratory.
Genetic analysis in 2009 had pointed to sponges as the first animal; this fossil evidence confirms that.
The complete analysis of a sponges (2010) shows that it has “same core building blocks for multicellular form and function that still sits at the heart of all living animals, including humans: Read more in the Berkeley News.
THE TREE OF LIFE
Over 150 years ago, Darwin chose the tree of life as a metaphor for one of the most powerful ideas in biology: the relatedness of all living things. The power of that idea can be seen today in the ubiquity of evolutionary trees (also called phylogenetic trees) in all biological disciplines, from studies of newly discovered species to cutting-edge cancer research. To understand modern biology, we all need to understand how evolutionary trees can be read and used.
The Tree Room provides a wide variety of tools for teaching and learning about evolutionary trees in both classrooms and informal science education settings.
New York Times article about carnivorous sponges: SpongeBob, the Carnivore.
Sponges are multicellular and were the first animals. Muticellularity evolved in animals, staring with the sponge, and also evolved independently in other groups. “Simple multicellularity has evolved numerous times within the Eukarya, but complex multicellular organisms belong to only six clades: animals, embryophytic land plants, florideophyte red algae, laminarialean brown algae, and two groups of fungi. Phylogeny and genomics suggest a generalized trajectory for the evolution of complex multicellularity, beginning with the co-optation of existing genes for adhesion. Molecular channels to facilitate cell-cell transfer of nutrients and signaling molecules appear to be critical, as this trait occurs in all complex multicellular organisms but few others. Proliferation of gene families for transcription factors and cell signals accompany the key functional innovation of complex multicellular clades: differentiated cells and tissues for the bulk transport of oxygen, nutrients, and molecular signals that enable organisms to circumvent the physical limitations of diffusion. The fossil records of animals and plants document key stages of this trajectory." Read full abstract at: Annual Reviews - Earth and Planetary Sciences, The Multiple Origins of Complex Multicellularity.
ROLE IN ECOSYSTEM
BBC Science and Environment article - "Sponges help coral reefs thrive in ocean deserts". Explains sponges' role in the ecosystem. The mystery of how coral reefs thrive in "ocean deserts" has been solved, scientists say. You can also download a pdf of this on-line article.
New York Times article - Researchers think that sponges helped oxygenate the deep ocean: This story is about “the first animals bootstrapping the environment into one where more complex animals could evolve. Read “Take a breath and thank a sponge".
Science Daily article "Scientists have found that some sponges can live and thrive on little oxygen".
Science News article - Read how sponges are taking over some coral reefs in the Caribbean (2015). Giant barrel sponges are hijacking Florida’s coral reefs.
Read About Sponges on Caribbean reefs: Sponges play a key role in the cycling of carbon and nitrogen on coral reefs where they are abundant. Through their microbial communities and dynamic pumping, sponges alter the water quality of the surrounding environment. Scientists studying one species in Florida Bay found that a sponge took up dissolved carbon and nitrogen in respiration. The dissolved nitrogen released by the sponge in respiration is the dominant source of dissolved nitrogen in the offshore basin. When an event decimated much of the sponge population, the chemical and ecological structure of the system changed. Read the abstract on ProQuest: "The role of marine sponges in carbon and nitrogen cycles of coral reef and nearshore environments".
“Sponges have always been an important component of Caribbean coral reef communities, but they have become increasingly dominant as reef-building corals have declined because of stressors associated with climate change, disease, and pollution. Unlike corals and some seaweeds that secrete calcium carbonate skeletons, sponges have skeletons of glass or protein (if they have them at all), and they are less likely to be affected by ocean acidification, which may tip the competitive balance in their favor. Sponges are important to the overall ecology of coral reefs for many reasons: they are very efficient filter feeders, providing an important link in benthic–pelagic coupling and their bodies provide shelter for large numbers of invertebrates and fishes. Sponges harbor microbial symbionts, which may be important carbon and nitrogen fixers in oligotrophic tropical waters. Sponges are aggressive competitors for space and are primary agents of carbonate bioerosion on coral reefs but may also be important in holding the reef framework together.” Read the abstract from BioScience: "The Chemical Ecology of Sponges on Caribbean Reefs: Natural Products Shape Natural Systems".
Sponges help consolidate rubble on shallow Caribbean reefs by quickly adhering to rubble and stabilizing it until carbonate secreting organisms can grow and consolidate it to the reef. Read the article: "Sponge-mediated coral reef growth and rejuvenation".
Sponge poop plays a key role in tropical reef ecosystems. Read more in the article: "Sponge feces as the driving force behind tropical coral reefs".
From the University of Michigan Museum of Zoology: Giant barrel sponges play an important role in coral reef ecosystems because they filter large quantity of water and provide habitat for other organisms. Read about one species giant barrel sponge.
Sponges harbor a large community of bacteria. These bacteria capture phosphorus, a key nutrient, in the water and turn it into a form that is available for the coral reef community. Read about how the bacteria in sponges contribute to the reef community.
Read about deep sea sponges and corals and the role they play in deep sea ecosystems in this article: "NOAA Deep Sea Sponges and Corals".
Sponges in the Ross Sea in the Antarctic play a key role in the ecosystem. Read the article here.
Sponges can’t move away from predators and they must compete for space in dense communities like coral reefs. So sponges have evolved an arsenal of chemicals for defense. Pharmaceuticals from natural products often are derived from these kind of defensive chemicals. So scientists have tested many compounds in sponges and several drugs have been developed with more being tested. Read more on Carsten Thoms' blog post: "Biotechnological potential of sponges and their associated microorganisms".
Researchers have tested compounds in sponges for medicines, called bioprospecting, and have found many useful compounds including antiviral drugs, like AZT used to fight HIV-AIDS, and the anticancer agents, were developed from extracts of sponges. Other compounds are being tested for anti-inflammatory and anti-bacterial drugs. Read more on the NOAA website: "Coral Reef Conservation Program".
Half of the body of sponges is made of bacteria. The relationship between sponges and bacteria may be very old. Scientists are conducting research on some of these bacteria to see what useful pharmaceuticals might be derived from the bacteria. Read more from Science Daily: "Bacteria From Sponges Make New Pharmaceuticals".
Read about a scientist who “bio-prospects” for medicines from sponges in the Ocean Portal article: Five Questions for Shirley Pomponi, Medical Sponge Hunter.
Strong, but flexible sponges inspire new materials. Scientists created their own spicules, imitating the support structure of sponges. Read more in Science Daily: "Inspired by Deep Sea Sponges: Creating Flexible Minerals".
Read about how the structural strength of glass sponges has inspired design in the Wyss Institute article: Glass sponges hold internal secrets to structural strength.
From NPR "All Things Considered" - Listen to a radio story about the structure of glass sponges. And read the article: "Deep Sea Sponges Are Master Builders in Glass" that accompanies the story.
CLIMATE CHANGE AND OCEAN ACIDIFICATION
These sponges may benefit from increasing ocean acidification. Boring sponges – “boring” means excavating – break down and recycle the calcium carbonate of the reefs. These sponges play a key role in that recycling. And with increasing ocean acidification the calcium carbonate on the reef will be easier for the barrel sponge to excavate. From The Smithsonian Ocean Portal: "Ocean Acidification Excites Boring Sponges".