Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change

Abstract Spatial grain of studies of communities is often based on arbitrary convention. Few studies have examined how spatial scaling of grain size affects estimates of compositional change over time, despite its broad implications. Fish assemblage structure was compared between 1974 and 2014 at 33...

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Autor principal:	Zachery D. Zbinden
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2020
Materias:	biodiversity monitoring community stability domains of scale headwater streams persistence spatial clustering Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/a4c8686063c74bcb8602ea312641ef7a
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spelling	oai:doaj.org-article:a4c8686063c74bcb8602ea312641ef7a2021-11-04T13:06:10ZTemporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change2045-775810.1002/ece3.5954https://doaj.org/article/a4c8686063c74bcb8602ea312641ef7a2020-01-01T00:00:00Zhttps://doi.org/10.1002/ece3.5954https://doaj.org/toc/2045-7758Abstract Spatial grain of studies of communities is often based on arbitrary convention. Few studies have examined how spatial scaling of grain size affects estimates of compositional change over time, despite its broad implications. Fish assemblage structure was compared between 1974 and 2014 at 33 sampling locations in the Muddy Boggy River drainage, USA. The two main objectives for this comparison were to quantify change in assemblage structure and to test for a relationship between compositional change and spatial scale. Spatial scale was manipulated by pooling assemblage data into a continuous range of groups, which increased in size from K = 33 pairs (i.e., local scale) to K = 1 pair (i.e., global scale), via clustering algorithm based on pair‐wise fluvial distance. Local assemblages (stream reaches) varied in the degree of assemblage change over time (range = 0.10–0.99 dissimilarity; mean = 0.66). The global assemblage (drainage), however, remained relatively similar. A discontinuity in the relationship between compositional change and spatial scale occurred at K = 15 (mean dissimilarity = 0.56; p = .062), and this grouping is roughly the size of the headwater/tributary drainages (i.e., stream order ≤ 3) in the study system. Spatial scale can impact estimates of biodiversity change over time. These results suggest assemblages are more dynamic at individual stream reaches than at the scale of the entire drainage. The decline in assemblage change at the spatial scale of K = 15 deserves further attention given the marginal significance, despite a small sample size (n = 15). This pattern could suggest regional and meta‐community processes become more important in shaping assemblage dynamics at the scale of headwater drainages, whereas the factors responsible for driving individual stream reach dynamics (e.g., stochasticity) become less important. Defining assemblages at a larger scale will result in different estimates of species persistence. Biodiversity monitoring efforts must take the effect of spatial scaling into consideration.Zachery D. ZbindenWileyarticlebiodiversity monitoringcommunity stabilitydomains of scaleheadwater streamspersistencespatial clusteringEcologyQH540-549.5ENEcology and Evolution, Vol 10, Iss 2, Pp 952-961 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	biodiversity monitoring community stability domains of scale headwater streams persistence spatial clustering Ecology QH540-549.5
spellingShingle	biodiversity monitoring community stability domains of scale headwater streams persistence spatial clustering Ecology QH540-549.5 Zachery D. Zbinden Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
description	Abstract Spatial grain of studies of communities is often based on arbitrary convention. Few studies have examined how spatial scaling of grain size affects estimates of compositional change over time, despite its broad implications. Fish assemblage structure was compared between 1974 and 2014 at 33 sampling locations in the Muddy Boggy River drainage, USA. The two main objectives for this comparison were to quantify change in assemblage structure and to test for a relationship between compositional change and spatial scale. Spatial scale was manipulated by pooling assemblage data into a continuous range of groups, which increased in size from K = 33 pairs (i.e., local scale) to K = 1 pair (i.e., global scale), via clustering algorithm based on pair‐wise fluvial distance. Local assemblages (stream reaches) varied in the degree of assemblage change over time (range = 0.10–0.99 dissimilarity; mean = 0.66). The global assemblage (drainage), however, remained relatively similar. A discontinuity in the relationship between compositional change and spatial scale occurred at K = 15 (mean dissimilarity = 0.56; p = .062), and this grouping is roughly the size of the headwater/tributary drainages (i.e., stream order ≤ 3) in the study system. Spatial scale can impact estimates of biodiversity change over time. These results suggest assemblages are more dynamic at individual stream reaches than at the scale of the entire drainage. The decline in assemblage change at the spatial scale of K = 15 deserves further attention given the marginal significance, despite a small sample size (n = 15). This pattern could suggest regional and meta‐community processes become more important in shaping assemblage dynamics at the scale of headwater drainages, whereas the factors responsible for driving individual stream reach dynamics (e.g., stochasticity) become less important. Defining assemblages at a larger scale will result in different estimates of species persistence. Biodiversity monitoring efforts must take the effect of spatial scaling into consideration.
format	article
author	Zachery D. Zbinden
author_facet	Zachery D. Zbinden
author_sort	Zachery D. Zbinden
title	Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
title_short	Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
title_full	Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
title_fullStr	Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
title_full_unstemmed	Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
title_sort	temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
publisher	Wiley
publishDate	2020
url	https://doaj.org/article/a4c8686063c74bcb8602ea312641ef7a
work_keys_str_mv	AT zacherydzbinden temporaldynamicsofstreamfishassemblagesandtheroleofspatialscaleinquantifyingchange
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Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change

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