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Population fluctuations affect inference in ecological networks of multi-species interactions

Titelangaben

Wells, Konstans ; Feldhaar, Heike ; O'Hara, Robert B.:
Population fluctuations affect inference in ecological networks of multi-species interactions.
In: Oikos. Bd. 123 (2014) . - S. 589-598.
ISSN 1600-0706
DOI: https://doi.org/10.1111/oik.01149

Abstract

Local abundance and population fluctuations are key factors affecting the realized interaction frequencies in biotic interactions, but they are commonly ignored when network metrics are calculated over aggregated sets of observations. Here we studied how abundance fluctuations (i.e. demographic and stochastic population dynamics in one of the trophic levels) may affect derived network-level inferences in bipartite ecological networks. Variation at both the species and network level in network indices (d', Dependence, Fisher's alpha diversity for both levels, H-2', weighted NODF) were strongly correlated with the extent of abundance fluctuations, with a strong effect of environmental stochasticity on all indices except NODF; this was the only index for which considerable variation was caused by varying carrying capacities among species. Binary connectance, in turn, does not take interaction frequency (and thus abundance) into account and was only influenced by abundance fluctuations at low population sizes if this led to non-occurrence of 'true' interactions. Overall, abundance and population dynamics are likely to play an important role in determining what is commonly observed and summarized into ecological networks. We suggest that ecological network inference should account for underlying population dynamics and uncertainty in what is observed as interaction frequencies, modelling mechanisms at operative organisational levels below the network rather than using aggregated data of observations. Modelling population dynamics may be a valuable tool in this field to conceptualize and tease apart different sources of variation and express uncertainty in our inference from small samples.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER122491
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Tierökologie I
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Professur Populationsökologie der Tiere > Professur Populationsökologie der Tiere - Univ.-Prof. Dr. Heike Feldhaar
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Professur Populationsökologie der Tiere
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften; Biologie
500 Naturwissenschaften und Mathematik > 590 Tiere (Zoologie)
Eingestellt am: 24 Apr 2015 09:05
Letzte Änderung: 17 Mai 2023 08:50
URI: https://eref.uni-bayreuth.de/id/eprint/10819