Does the developmental stage and composition of riparian forest stand affect ecosystem functioning in streams?

Area of Science:

• Ecology
• Environmental Science
• Restoration Ecology

Background:

• Riparian corridors are replanted in watershed restoration to improve water quality.
• Restoration may alter natural plant communities, impacting aquatic ecosystems.
• Leaf litter decomposition, driven by microbes and invertebrates, is crucial for stream functioning.

Purpose of the Study:

• To investigate how riparian forest type and developmental stage influence stream ecosystem functioning.
• To assess the effects of different tree species (alder, oak, eucalyptus) and their developmental stages on leaf litter decomposition.

Main Methods:

• Conducted stream litter decomposition experiments using leaf litter from alder, oak, and eucalyptus trees of varying developmental stages.
• Measured leaf mass loss, fungal and invertebrate biomass and diversity, fungal sporulation, and invertebrate abundance.

Main Results:

• Both riparian forest type and developmental stage significantly affected leaf mass loss, fungal and invertebrate biomass, fungal sporulation, and invertebrate abundance.
• Fungal diversity and richness were influenced by developmental stage, while invertebrate diversity and richness were affected by both type and stage.
• Leaf litter decomposition rates and associated microbial and invertebrate communities varied based on tree species and age.

Conclusions:

• Stream ecosystem processes are determined by both the composition and developmental stage of riparian stands.
• Altering riparian forest composition through restoration can impact key ecosystem processes.
• Findings offer insights for successful future watershed management and restoration strategies.