Vegetation patterns and hydro-geological drivers of freshwater rock pool communities in the monsoon-tropical Kimberley region, Western Australia

Adam Cross, Shane Turner, David Merritt, Adriaan Van Niekerk, Michael Renton, Kingsley Dixon, Laco Mucina

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

© 2015 International Association for Vegetation Science. Question: Freshwater rock pools (FRP) are small, highly stressed wetland habitats that harbour many range-restricted and specialized plants. We examined the phytosociological patterns of FRP in a biodiverse monsoon-tropical region, to establish the influence of hydro-geological drivers on vegetation patterns in rock pool plant communities. Location: Gardner Plateau, central North Kimberley, Western Australia (centre of the study area: 14°47′46″ S, 126°31′27″ E). Methods: A total of 1066 phytosociological relevés (microplots), as well as measurements of physical habitat characteristics, were collected from 580 rock pools. Communities were classified using clustering and table sorting. The hydrological regime of each rock pool was dynamically modelled, and the most significant predicative hydro-geological factors were determined for each species and vegetation community using canonical correlation analysis, classification and regression trees and random forests. Results: Variation in maximum rock pool depth, hydroperiod and the number of annual innundation events were identified as the most significant environmental predictors of community composition. All resident taxa were either regional or narrow-range endemics, with four species representing strict FRP specialists. FRP-specialist taxa exhibited the highest levels of hydro-geological specialization, and these species occurred in distinct communities characterized by longer periods of inundation and fewer annual inundation events than assemblages of non-specialist rock pool species. Eight distinct plant communities were recognized. Conclusions: FRP in the monsoonal tropics are dynamic and hydrologically unpredictable aquatic ecosystems that harbour a number of unique plant communities. The duration and periodicity of seasonal inundation represent major ecological drivers of vegetation assemblages in these habitats, with inhabitant species exhibiting a progression of specialization to hydro-geological factors along a gradient of hydrological stability. Although the colonization of individual rock pools by wetland plants appears to be a random process governed by the serendipity of seed arrival events, the comparative stability of FRP over long geological time frames may have facilitated the persistence of a small number of highly specialized taxa in these ecosystems.
Original languageEnglish
Pages (from-to)1184-1197
JournalJournal of Vegetation Science
Volume26
Issue number6
DOIs
Publication statusPublished - 2015

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rock pool
tropical region
Western Australia
tropics
monsoon
rocks
vegetation
plant community
plant communities
harbor
habitat
habitats
wetland
hydroperiod
wetland plants
geological time
hydrological regime
periodicity
sorting
aquatic ecosystem

Cite this

@article{2751bd44599c4548890d75f4f49d7cac,
title = "Vegetation patterns and hydro-geological drivers of freshwater rock pool communities in the monsoon-tropical Kimberley region, Western Australia",
abstract = "{\circledC} 2015 International Association for Vegetation Science. Question: Freshwater rock pools (FRP) are small, highly stressed wetland habitats that harbour many range-restricted and specialized plants. We examined the phytosociological patterns of FRP in a biodiverse monsoon-tropical region, to establish the influence of hydro-geological drivers on vegetation patterns in rock pool plant communities. Location: Gardner Plateau, central North Kimberley, Western Australia (centre of the study area: 14°47′46″ S, 126°31′27″ E). Methods: A total of 1066 phytosociological relev{\'e}s (microplots), as well as measurements of physical habitat characteristics, were collected from 580 rock pools. Communities were classified using clustering and table sorting. The hydrological regime of each rock pool was dynamically modelled, and the most significant predicative hydro-geological factors were determined for each species and vegetation community using canonical correlation analysis, classification and regression trees and random forests. Results: Variation in maximum rock pool depth, hydroperiod and the number of annual innundation events were identified as the most significant environmental predictors of community composition. All resident taxa were either regional or narrow-range endemics, with four species representing strict FRP specialists. FRP-specialist taxa exhibited the highest levels of hydro-geological specialization, and these species occurred in distinct communities characterized by longer periods of inundation and fewer annual inundation events than assemblages of non-specialist rock pool species. Eight distinct plant communities were recognized. Conclusions: FRP in the monsoonal tropics are dynamic and hydrologically unpredictable aquatic ecosystems that harbour a number of unique plant communities. The duration and periodicity of seasonal inundation represent major ecological drivers of vegetation assemblages in these habitats, with inhabitant species exhibiting a progression of specialization to hydro-geological factors along a gradient of hydrological stability. Although the colonization of individual rock pools by wetland plants appears to be a random process governed by the serendipity of seed arrival events, the comparative stability of FRP over long geological time frames may have facilitated the persistence of a small number of highly specialized taxa in these ecosystems.",
author = "Adam Cross and Shane Turner and David Merritt and {Van Niekerk}, Adriaan and Michael Renton and Kingsley Dixon and Laco Mucina",
year = "2015",
doi = "10.1111/jvs.12318",
language = "English",
volume = "26",
pages = "1184--1197",
journal = "Journal of Vegetation Science",
issn = "1100-9233",
publisher = "Wiley-Blackwell",
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}

Vegetation patterns and hydro-geological drivers of freshwater rock pool communities in the monsoon-tropical Kimberley region, Western Australia. / Cross, Adam; Turner, Shane; Merritt, David; Van Niekerk, Adriaan; Renton, Michael; Dixon, Kingsley; Mucina, Laco.

In: Journal of Vegetation Science, Vol. 26, No. 6, 2015, p. 1184-1197.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Vegetation patterns and hydro-geological drivers of freshwater rock pool communities in the monsoon-tropical Kimberley region, Western Australia

AU - Cross, Adam

AU - Turner, Shane

AU - Merritt, David

AU - Van Niekerk, Adriaan

AU - Renton, Michael

AU - Dixon, Kingsley

AU - Mucina, Laco

PY - 2015

Y1 - 2015

N2 - © 2015 International Association for Vegetation Science. Question: Freshwater rock pools (FRP) are small, highly stressed wetland habitats that harbour many range-restricted and specialized plants. We examined the phytosociological patterns of FRP in a biodiverse monsoon-tropical region, to establish the influence of hydro-geological drivers on vegetation patterns in rock pool plant communities. Location: Gardner Plateau, central North Kimberley, Western Australia (centre of the study area: 14°47′46″ S, 126°31′27″ E). Methods: A total of 1066 phytosociological relevés (microplots), as well as measurements of physical habitat characteristics, were collected from 580 rock pools. Communities were classified using clustering and table sorting. The hydrological regime of each rock pool was dynamically modelled, and the most significant predicative hydro-geological factors were determined for each species and vegetation community using canonical correlation analysis, classification and regression trees and random forests. Results: Variation in maximum rock pool depth, hydroperiod and the number of annual innundation events were identified as the most significant environmental predictors of community composition. All resident taxa were either regional or narrow-range endemics, with four species representing strict FRP specialists. FRP-specialist taxa exhibited the highest levels of hydro-geological specialization, and these species occurred in distinct communities characterized by longer periods of inundation and fewer annual inundation events than assemblages of non-specialist rock pool species. Eight distinct plant communities were recognized. Conclusions: FRP in the monsoonal tropics are dynamic and hydrologically unpredictable aquatic ecosystems that harbour a number of unique plant communities. The duration and periodicity of seasonal inundation represent major ecological drivers of vegetation assemblages in these habitats, with inhabitant species exhibiting a progression of specialization to hydro-geological factors along a gradient of hydrological stability. Although the colonization of individual rock pools by wetland plants appears to be a random process governed by the serendipity of seed arrival events, the comparative stability of FRP over long geological time frames may have facilitated the persistence of a small number of highly specialized taxa in these ecosystems.

AB - © 2015 International Association for Vegetation Science. Question: Freshwater rock pools (FRP) are small, highly stressed wetland habitats that harbour many range-restricted and specialized plants. We examined the phytosociological patterns of FRP in a biodiverse monsoon-tropical region, to establish the influence of hydro-geological drivers on vegetation patterns in rock pool plant communities. Location: Gardner Plateau, central North Kimberley, Western Australia (centre of the study area: 14°47′46″ S, 126°31′27″ E). Methods: A total of 1066 phytosociological relevés (microplots), as well as measurements of physical habitat characteristics, were collected from 580 rock pools. Communities were classified using clustering and table sorting. The hydrological regime of each rock pool was dynamically modelled, and the most significant predicative hydro-geological factors were determined for each species and vegetation community using canonical correlation analysis, classification and regression trees and random forests. Results: Variation in maximum rock pool depth, hydroperiod and the number of annual innundation events were identified as the most significant environmental predictors of community composition. All resident taxa were either regional or narrow-range endemics, with four species representing strict FRP specialists. FRP-specialist taxa exhibited the highest levels of hydro-geological specialization, and these species occurred in distinct communities characterized by longer periods of inundation and fewer annual inundation events than assemblages of non-specialist rock pool species. Eight distinct plant communities were recognized. Conclusions: FRP in the monsoonal tropics are dynamic and hydrologically unpredictable aquatic ecosystems that harbour a number of unique plant communities. The duration and periodicity of seasonal inundation represent major ecological drivers of vegetation assemblages in these habitats, with inhabitant species exhibiting a progression of specialization to hydro-geological factors along a gradient of hydrological stability. Although the colonization of individual rock pools by wetland plants appears to be a random process governed by the serendipity of seed arrival events, the comparative stability of FRP over long geological time frames may have facilitated the persistence of a small number of highly specialized taxa in these ecosystems.

U2 - 10.1111/jvs.12318

DO - 10.1111/jvs.12318

M3 - Article

VL - 26

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JO - Journal of Vegetation Science

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