Temporal dynamics of stream fish assemblages and the role of spatial scale in quantifying change
| Autor: | Zachery D. Zbinden |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Change over time Biodiversity Fluvial community stability temporal beta diversity 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Tributary Drainage Scaling QH540-549.5 Ecology Evolution Behavior and Systematics 030304 developmental biology Nature and Landscape Conservation Original Research 0303 health sciences geography geography.geographical_feature_category Ecology Small sample domains of scale persistence headwater streams spatial clustering spatial grain biodiversity monitoring Spatial ecology Environmental science Physical geography |
| Zdroj: | Ecology and Evolution Ecology and Evolution, Vol 10, Iss 2, Pp 952-961 (2020) |
| ISSN: | 2045-7758 |
| Popis: | 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. Estimates of stream fish assemblage change between two sampling periods 40 years apart were influenced by the spatial scale used to define assemblage size. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text