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Navigating biodiversity patterns in fragmented seagrass mosaics.

Rodrigo Riera1, Néstor E Bosch1, Eduardo Infantes2

  • 1Grupo en Biodiversidad y Conservación (BIOCON), ECOAQUA, Universidad de Las Palmas de Gran Canaria, Canary Islands, 35017, Spain.

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Habitat fragmentation in eelgrass meadows impacts biodiversity. Less fragmented meadows support larger fauna, while high fragmentation alters infauna, emphasizing conservation needs.

Keywords:
Associated communitiesConservationInvertebratesMeadowsSeascape

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Area of Science:

  • Marine ecology
  • Conservation biology
  • Ecosystem dynamics

Background:

  • Habitat fragmentation, driven by human activities, poses a significant threat to biodiversity, especially in coastal ecosystems.
  • Seagrass meadows are vulnerable to fragmentation, leading to amplified edge effects and disrupted ecological functions.
  • Understanding faunal responses to fragmentation is crucial for effective conservation strategies.

Purpose of the Study:

  • To investigate the effects of habitat fragmentation on different faunal assemblages (large epifauna, small epifauna, and infauna) in eelgrass meadows.
  • To analyze faunal community structure across varying fragmentation levels (low, medium, high) and patch zones (Edge, Near-Edge, Center).
  • To provide a multi-assemblage perspective on habitat fragmentation impacts in coastal ecosystems.

Main Methods:

  • Field surveys were conducted in eelgrass (Zostera marina) meadows along the Skagerrak coast, Sweden.
  • Faunal communities were sampled across three levels of habitat fragmentation and three patch zones.
  • Statistical modeling was employed to analyze community responses to fragmentation and spatial variation.

Main Results:

  • Large epifauna, particularly amphipods, were more abundant in less fragmented meadows, with highly fragmented areas showing more even species distributions.
  • Small epifauna abundance remained consistent across different fragmentation levels and zones.
  • Infaunal communities exhibited the most significant variation, with high fragmentation associated with increased species evenness and altered composition.

Conclusions:

  • Conserving less fragmented eelgrass meadows is vital for maintaining biodiversity and ecological resilience.
  • Targeted restoration efforts are needed for degraded, highly fragmented areas.
  • Addressing both patch- and seascape-level fragmentation is essential for effective coastal ecosystem conservation.