Marine sponges are not merely passive filter feeders but active, photosynthetic organisms that contribute to coral reef productivity, according to a study published in Functional Ecology. Research conducted by the University of Amsterdam’s Institute for Biodiversity and Ecosystem Dynamics (IBED) reveals that sponges utilize symbiotic microbes to generate energy from sunlight, challenging the traditional classification of these creatures as strictly consumers.
How do sponges photosynthesize like plants?
Sponges host symbiotic, photosynthetic microbes within their bodies, which allow them to produce their own food and release oxygen, according to Michelle Achlatis. While sponges are well-known for “drinking” dissolved nutrients and trapping edible particles through filter feeding, this dual-functionality allows them to supplement their diet using solar energy. Jasper de Goeij, an associate professor of marine benthic ecology at IBED, notes that these organisms do not follow the strict plant-animal distinction, as they function as both producers and consumers.
Sponges are often overlooked in reef modeling as pure consumers. New data suggest they are flexible “multitaskers” that play a significant role in ecosystem energy production.
Why does the role of sponges in reef ecosystems matter?
Re-evaluating sponge behavior is essential for accurate carbon sequestration assessments in tropical environments, according to Achlatis. Because sponges are more abundant in three-dimensional reef structures than previously estimated, their combined ability to recycle nutrients and generate energy through photosynthesis impacts the overall health of the reef. By failing to account for this production, previous food web models may have underestimated the total energy output of coral reef ecosystems.
What does the latest research reveal about sponge abundance?
Achlatis and her colleagues assessed 24 of the most common sponge species around the island of Curaçao to determine their impact at an ecosystem level. By utilizing a holistic, three-dimensional dataset, the team calculated sponge volumes. These measurements confirmed that sponges contribute to the oxygen and energy balance of their habitats. The study suggests that these photosynthetic traits are likely present in sponges in similar regions.
When studying benthic ecology, look for three-dimensional abundance data to account for the richness of the reef.
Frequently Asked Questions
Are sponges considered plants or animals?
Jasper de Goeij adds that sponges are not plants but are not animals either, as they do not follow the strict plant-animal distinction as most organisms on land. Through their symbiotic relationship with photosynthetic microbes, they exhibit both plant-like (producer) and animal-like (consumer) characteristics.
Do all sponges use photosynthesis?
The study assessed 24 of the most common sponge species from reefs around Curaçao and conducted extensive measurements for eight of these species. While the trait is present in these species, the study indicates that sponges in similar regions may have the same photosynthetic components.
How does this change our understanding of coral reefs?
It shifts the perception of sponges from “pure consumers” to organisms that contribute to the energy and oxygen production of the reef, necessitating their inclusion in assessments of carbon sequestration.
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