Spatial and temporal patterns in macrofaunal diversity components relative to sea floor landscape structure

Area of Science:

• Marine Ecology
• Benthic Ecology
• Biodiversity Science

Background:

• Understanding macrofaunal diversity patterns across spatial scales is crucial for marine ecosystem management.
• Temporal dynamics and environmental factors like hypoxia can significantly influence benthic communities.

Purpose of the Study:

• To examine temporal changes in macrofaunal alpha- and beta-diversity across multiple spatial scales in Long Island Sound.
• To assess the contributions of different diversity components (alpha, beta, gamma, epsilon) to overall biodiversity.
• To investigate the impact of spatial and temporal factors, including hypoxia, on diversity patterns.

Main Methods:

• Additive and multiplicative diversity partitioning were used to analyze diversity components.
• Macrofaunal communities were sampled across various spatial scales (within-patch, among-patch, landscape, region).
• Temporal changes in diversity were assessed over time, with a focus on periods of hypoxia.

Main Results:

• Beta-diversity components at patch and region scales contributed most to gamma-diversity based on additive partitioning.
• Species turnover was highest at within- and among-patch scales, indicated by multiplicative partitioning.
• Hypoxia events led to sharp increases in within-patch and patch-scale beta-diversity.
• Rare species were consistent components of diversity across scales and time.

Conclusions:

• Diversity patterns are scale-dependent and influenced by habitat heterogeneity, depth, and estuarine characteristics.
• Temporal variations in diversity are linked to seasonal changes, population dynamics, and disturbances like hypoxia.
• Studies neglecting temporal dynamics may not fully capture biodiversity patterns and their drivers across spatial scales.