For over a century, European paleoecology was dominated by the closed-canopy paradigm, which posited that post-glacial Europe prior to early agriculture was covered by an unbroken, dense primeval forest. Proponents of this view relied primarily on pollen diagrams from peat bogs, which showed high proportions of arboreal pollen relative to herbaceous species. However, ecologist Frans Vera recently challenged this orthodox reconstruction, arguing that heavy grazing and browsing by now-extinct or decimated megaherbivores—such as aurochs, wisents, and wild horses—maintained a dynamic, open mosaic of woodlands, scrub, and pastures. Vera suggested that high arboreal pollen percentages were an artifact of wind-pollinated trees over-representing forest cover compared to insect-pollinated or browsed open-habitat flora. While some palynologists have criticized Vera for underestimating the shade tolerance of climax forest species and over-extrapolating from modern wood-pasture analogues, his work has nonetheless forced a fundamental re-evaluation of primeval ecosystem dynamics, demonstrating that herbivore disturbance was an integral driver of landscape architecture rather than a minor, localized factor.
Which of the following best states the primary purpose of the passage?
- To evaluate a challenge to a longstanding ecological model and assess its impact on primeval ecosystem studies.Cevap
- BTo explain why wind-pollinated trees produce higher percentages of pollen in peat bogs than insect-pollinated flora.
- CTo argue that megaherbivore reintroduction is the only viable method for restoring Europe's prehistoric biodiversity.
- DTo demonstrate that traditional palynology successfully disproved Vera's wood-pasture hypothesis regarding shade-tolerant climax forests.
- ETo denounce twentieth-century paleoecologists for deliberately falsifying pollen data to support closed-canopy models.