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Titel (primär) Transitions and invasion along a grazing gradient in experimental California grasslands
Autor Stein, C.; Harpole, W.S.; Suding, K.N.;
Journal / Serie Ecology
Erscheinungsjahr 2016
Department iDiv; PHYDIV;
Band/Volume 97
Heft 9
Sprache englisch;
POF III (gesamt) T11;
Supplements https://esajournals.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fecy.1478&file=ecy1478-sup-0001-AppendixS1.docx
UFZ Querschnittsthemen RU1

Resilience-based frameworks, founded upon the existence of multiple attractors and regime shifts, have long been applied to complex dynamics of semiarid systems. Utilizing seed addition tests in experimental plantings along grazing gradients, we applied an increase-when-rare criterion to identify bidirectional (states can invade each other) and directional (only one state can invade) transitions among vegetation states characteristic of California grasslands over five years. Annual forage and medusahead grasslands were able to invade each other at all grazing intensities, indicating coexistence. Directional transitions involving invasion of native bunchgrass by other species occurred as grazing intensity increased; recovery (transitions to natives) did not occur at low grazing. While directional transitions at some grazing intensities were accompanied by state persistence at others, we found little evidence for persistence of alternative states at any grazing intensity. Our results suggest that grazing can affect resilience by causing hard-to-reverse transitions, but rarely produces alternative states. However, variation in precipitation seems to dominate grazing responses, supporting the applicability of the nonequilibrium concept in our study system.

ID 17878
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17878
Stein, C., Harpole, W.S., Suding, K.N. (2016):
Transitions and invasion along a grazing gradient in experimental California grasslands
Ecology 97 (9), 2319 - 2330