Variation in seagrass height and density over a wide spatial scale: effects on common fish and decapods

Johann D. Bell*, Mark Westoby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

160 Citations (Scopus)

Abstract

This study examines whether relationships between abundances of fishes and decapods and the leaf height and density of seagrass determined from small scale field experiments within a seagrass bed were also evident at a wider spatial scale, i.e. among beds within a bay. Separate comparisons were made for common species of fishes and decapods associated with the seagrasses Zostera capricorni Aschers, and Posidonia australis Hook f. Of the 23 significant responses by species to leaf height or density in the small scale experimental study, 15 were not repeated at the wider scale. Abundances of species with inconsistent responses at the two scales were not correlated meaningfully with other major environmental variables such as sediment size, area of seagrass bed or distance from the ocean. We reconcile the high incidence of effects of leaf height and density within beds, and their scarcity among beds, with a model of how postlarvae settle into, and move within, seagrass beds. The model holds that (1) larvae of fishes and decapods are distributed patchily when ready to settle, (2) larvae do not discriminate among beds when they settle, and (3) individuals do not leave a bed soon after settling but do redistribute within the bed to select microsites favouring survival.

Original languageEnglish
Pages (from-to)275-295
Number of pages21
JournalJournal of Experimental Marine Biology and Ecology
Volume104
Issue number1-3
DOIs
Publication statusPublished - 31 Dec 1986

Keywords

  • decapods
  • fishes
  • habitat complexity
  • larval settlement
  • Posidonia
  • stochastic recruitment
  • Zostera

Fingerprint

Dive into the research topics of 'Variation in seagrass height and density over a wide spatial scale: effects on common fish and decapods'. Together they form a unique fingerprint.

Cite this