Razor clam (Pinna bicolor) structural mimics as drivers of epibenthic biodiversity; a manipulative experiment.

Area of Science:

• Marine Ecology
• Restoration Ecology
• Bivalve Biology

Background:

• Shellfish ecosystems provide vital functions but face global decline due to overexploitation.
• Habitat-forming bivalves like oysters, mussels, and pinnids are crucial for coastal management and ecological engineering.
• Pinnids, particularly razor clams (Pinna bicolor), are understudied yet form dense aggregations with significant ecological roles.

Purpose of the Study:

• To investigate if artificial razor clam shells can restore ecological functions by providing structural habitat.
• To assess the influence of intertidal benthic structures on micro-habitats and associated communities.
• To examine the short-term responses of benthic and epifaunal communities to artificial pinnid structures.

Main Methods:

• A manipulative experiment was conducted in an urban Australian estuary.
• Artificial razor clam shells (open and closed) were deployed as intertidal benthic structures.
• The study monitored changes in epiphytic organisms, epifaunal biodiversity, sediment characteristics, and infaunal macroinvertebrates over 12 weeks.

Main Results:

• Artificial razor clam structures rapidly altered the aboveground ecological community within 12 weeks.
• Both open and closed artificial shells served as settlement surfaces for epiphytic organisms.
• Enhanced epifaunal biodiversity was observed on artificial shells, while sediment and infaunal communities remained largely unchanged.

Conclusions:

• Intertidal pinnid structures can rapidly facilitate beneficial ecological functions in estuarine ecosystems.
• Artificial shells provide valuable micro-habitats, enhancing epifaunal communities.
• This study offers insights into the ecological roles of understudied pinnids, informing future restoration and management strategies.