Species turnover along gradients of net primary productivity

Gary Wayne Luck, Fiona McCallum

Research output: Book chapter/Published conference paperChapter

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Abstract

A null model assuming a linear decline in species assemblage similarity with distance was able to match observed patterns in turnover in many cases. It was most successful in predicting turnover along high variation transects and for mammals. In many cases, species turnover was predicted from the simple assumption of consistent decline in the similarity between sites with increasing distance irrespective of the gradient in environmental variability. However, important differences occurred between taxonomic groups and gradients of low vs high variation. These differences suggest that protecting a few species rich sites in regions of low variability may capture a substantial proportion of regional diversity for highly mobile groups with large range sizes, although this wouldn’t be the case for less vagile and more geographically restricted species. Regions with high variation in NPP require a greater number of reserves owing to strong and consistent turnover irrespective of taxonomic group. Understanding the factors that drive spatial patterns in biodiversity is fundamental to developing effective conservation strategies. The relationships between net primary productivity (NPP) and species richness are well documented in the literature, yet the influence of spatial variation in productivity on species turnover has received relatively little attention. The aims of this study were to: i) compare patterns in species turnover among different taxonomic groups occupying spatial gradients that encompassed low variation in NPP and high variation in productivity; and ii) contrast these patterns with those produced by null models. We examined species turnover for birds, mammals and butterflies along replicate transects of approximately 1000 km split into 10 sampling sites. Six transects encompassed spatial gradients with little variation in NPP and six transects encompassed gradients with high variation in NPP. We calculated three representative indices of turnover and plotted these against distance between sampling sites to determine the decline in similarity among species assemblages with distance. Computer simulations were used to generate random (null) species distributions along transects based on simple ‘random distribution models’. These models assumed no differences between species and a consistent decline in species assemblage similarity with distance. Species turnover was greatest along transects with high variation in NPP, especially for birds. Significant turnover for mammals and butterflies was also recorded along many low variation transects. Birds and butterflies exhibited the lowest turnover overall – mammals had high turnover in almost all transects. Patterns in turnover varied depending on the index used. The index emphasising continuity in species composition always recorded the greatest turnover compared to indices representing differences in species identities or richness.
Original languageEnglish
Title of host publicationFocus on biodiversity research
EditorsJan Schwartz
Place of PublicationNew York, USA
PublisherNova Science Publishers
Pages179-198
Number of pages20
Edition1
ISBN (Print)9781600213724
Publication statusPublished - 2007

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primary productivity
mammals
butterflies
birds
species diversity
interspecific variation
computer simulation
spatial variation
biogeography
linear models
biodiversity
sampling

Cite this

Luck, G. W., & McCallum, F. (2007). Species turnover along gradients of net primary productivity. In J. Schwartz (Ed.), Focus on biodiversity research (1 ed., pp. 179-198). [8] New York, USA: Nova Science Publishers.
Luck, Gary Wayne ; McCallum, Fiona. / Species turnover along gradients of net primary productivity. Focus on biodiversity research. editor / Jan Schwartz. 1. ed. New York, USA : Nova Science Publishers, 2007. pp. 179-198
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Luck, GW & McCallum, F 2007, Species turnover along gradients of net primary productivity. in J Schwartz (ed.), Focus on biodiversity research. 1 edn, 8, Nova Science Publishers, New York, USA, pp. 179-198.

Species turnover along gradients of net primary productivity. / Luck, Gary Wayne; McCallum, Fiona.

Focus on biodiversity research. ed. / Jan Schwartz. 1. ed. New York, USA : Nova Science Publishers, 2007. p. 179-198 8.

Research output: Book chapter/Published conference paperChapter

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T1 - Species turnover along gradients of net primary productivity

AU - Luck, Gary Wayne

AU - McCallum, Fiona

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PY - 2007

Y1 - 2007

N2 - A null model assuming a linear decline in species assemblage similarity with distance was able to match observed patterns in turnover in many cases. It was most successful in predicting turnover along high variation transects and for mammals. In many cases, species turnover was predicted from the simple assumption of consistent decline in the similarity between sites with increasing distance irrespective of the gradient in environmental variability. However, important differences occurred between taxonomic groups and gradients of low vs high variation. These differences suggest that protecting a few species rich sites in regions of low variability may capture a substantial proportion of regional diversity for highly mobile groups with large range sizes, although this wouldn’t be the case for less vagile and more geographically restricted species. Regions with high variation in NPP require a greater number of reserves owing to strong and consistent turnover irrespective of taxonomic group. Understanding the factors that drive spatial patterns in biodiversity is fundamental to developing effective conservation strategies. The relationships between net primary productivity (NPP) and species richness are well documented in the literature, yet the influence of spatial variation in productivity on species turnover has received relatively little attention. The aims of this study were to: i) compare patterns in species turnover among different taxonomic groups occupying spatial gradients that encompassed low variation in NPP and high variation in productivity; and ii) contrast these patterns with those produced by null models. We examined species turnover for birds, mammals and butterflies along replicate transects of approximately 1000 km split into 10 sampling sites. Six transects encompassed spatial gradients with little variation in NPP and six transects encompassed gradients with high variation in NPP. We calculated three representative indices of turnover and plotted these against distance between sampling sites to determine the decline in similarity among species assemblages with distance. Computer simulations were used to generate random (null) species distributions along transects based on simple ‘random distribution models’. These models assumed no differences between species and a consistent decline in species assemblage similarity with distance. Species turnover was greatest along transects with high variation in NPP, especially for birds. Significant turnover for mammals and butterflies was also recorded along many low variation transects. Birds and butterflies exhibited the lowest turnover overall – mammals had high turnover in almost all transects. Patterns in turnover varied depending on the index used. The index emphasising continuity in species composition always recorded the greatest turnover compared to indices representing differences in species identities or richness.

AB - A null model assuming a linear decline in species assemblage similarity with distance was able to match observed patterns in turnover in many cases. It was most successful in predicting turnover along high variation transects and for mammals. In many cases, species turnover was predicted from the simple assumption of consistent decline in the similarity between sites with increasing distance irrespective of the gradient in environmental variability. However, important differences occurred between taxonomic groups and gradients of low vs high variation. These differences suggest that protecting a few species rich sites in regions of low variability may capture a substantial proportion of regional diversity for highly mobile groups with large range sizes, although this wouldn’t be the case for less vagile and more geographically restricted species. Regions with high variation in NPP require a greater number of reserves owing to strong and consistent turnover irrespective of taxonomic group. Understanding the factors that drive spatial patterns in biodiversity is fundamental to developing effective conservation strategies. The relationships between net primary productivity (NPP) and species richness are well documented in the literature, yet the influence of spatial variation in productivity on species turnover has received relatively little attention. The aims of this study were to: i) compare patterns in species turnover among different taxonomic groups occupying spatial gradients that encompassed low variation in NPP and high variation in productivity; and ii) contrast these patterns with those produced by null models. We examined species turnover for birds, mammals and butterflies along replicate transects of approximately 1000 km split into 10 sampling sites. Six transects encompassed spatial gradients with little variation in NPP and six transects encompassed gradients with high variation in NPP. We calculated three representative indices of turnover and plotted these against distance between sampling sites to determine the decline in similarity among species assemblages with distance. Computer simulations were used to generate random (null) species distributions along transects based on simple ‘random distribution models’. These models assumed no differences between species and a consistent decline in species assemblage similarity with distance. Species turnover was greatest along transects with high variation in NPP, especially for birds. Significant turnover for mammals and butterflies was also recorded along many low variation transects. Birds and butterflies exhibited the lowest turnover overall – mammals had high turnover in almost all transects. Patterns in turnover varied depending on the index used. The index emphasising continuity in species composition always recorded the greatest turnover compared to indices representing differences in species identities or richness.

KW - Open access version available

KW - Australia

KW - Beta-diversity

KW - Birds

KW - Butterflies

KW - Environmental variability

KW - Mammals

KW - Net primary productivity

KW - Null models

KW - Species turnover

M3 - Chapter

SN - 9781600213724

SP - 179

EP - 198

BT - Focus on biodiversity research

A2 - Schwartz, Jan

PB - Nova Science Publishers

CY - New York, USA

ER -

Luck GW, McCallum F. Species turnover along gradients of net primary productivity. In Schwartz J, editor, Focus on biodiversity research. 1 ed. New York, USA: Nova Science Publishers. 2007. p. 179-198. 8