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Isometric scaling of faunal patchiness: Seagrass macrobenthic abundance across small spatial scales

Journal Article


Abstract


  • Following earlier studies across 2115 → 33 m 2 scales (Barnes and Laurie, 2018), patchiness of macrobenthic abundance in intertidal Queensland seagrass was assessed by dispersion indices, spatial autocorrelation and hotspot analysis across a hierarchically-nested series of smaller scales (5.75 → 0.09 m 2 ). Overall patterns of distribution and abundance over larger extents and with greater lag were mirrored across these smaller ones. Assemblage abundance per station varied by a factor of >10, but all three approaches showed effective constancy of total assemblage patchiness across all sub-2115 m 2 scales (across-scales-mean Lloyd's I P of 1.06 and global Moran's I of 0.13). Equivalent constancy was also shown by most numerically-dominant species (scaling exponent β = 0.93–1.15). Decreasing patchiness of some species with decreasing scale, however, resulted in two no longer being patchily dispersed across small scales. Significant hotspots of abundance occurred at a constant proportion of stations across scales, against a background of randomly scattered peak-abundance points.

Publication Date


  • 2019

Citation


  • Barnes, R. S.K. & Hamylton, S. M. (2019). Isometric scaling of faunal patchiness: Seagrass macrobenthic abundance across small spatial scales. Marine Environmental Research, 146 89-100.

Scopus Eid


  • 2-s2.0-85063395946

Number Of Pages


  • 11

Start Page


  • 89

End Page


  • 100

Volume


  • 146

Place Of Publication


  • United Kingdom

Abstract


  • Following earlier studies across 2115 → 33 m 2 scales (Barnes and Laurie, 2018), patchiness of macrobenthic abundance in intertidal Queensland seagrass was assessed by dispersion indices, spatial autocorrelation and hotspot analysis across a hierarchically-nested series of smaller scales (5.75 → 0.09 m 2 ). Overall patterns of distribution and abundance over larger extents and with greater lag were mirrored across these smaller ones. Assemblage abundance per station varied by a factor of >10, but all three approaches showed effective constancy of total assemblage patchiness across all sub-2115 m 2 scales (across-scales-mean Lloyd's I P of 1.06 and global Moran's I of 0.13). Equivalent constancy was also shown by most numerically-dominant species (scaling exponent β = 0.93–1.15). Decreasing patchiness of some species with decreasing scale, however, resulted in two no longer being patchily dispersed across small scales. Significant hotspots of abundance occurred at a constant proportion of stations across scales, against a background of randomly scattered peak-abundance points.

Publication Date


  • 2019

Citation


  • Barnes, R. S.K. & Hamylton, S. M. (2019). Isometric scaling of faunal patchiness: Seagrass macrobenthic abundance across small spatial scales. Marine Environmental Research, 146 89-100.

Scopus Eid


  • 2-s2.0-85063395946

Number Of Pages


  • 11

Start Page


  • 89

End Page


  • 100

Volume


  • 146

Place Of Publication


  • United Kingdom