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Rothwald seed rain data

Citation

Gratzer, Georg (2022), Rothwald seed rain data, Dryad, Dataset, https://doi.org/10.5061/dryad.j3tx95xfz

Abstract

Given the limited dispersal distances for many temperate and tropical tree species (Ribbens et al. 1994, Nathan and Muller-Landau 2000, Martin and Canham 2010), the effect of spatial variability in seed input at the forest floor is fine-scaled and unfolds at the stand level. However, although seed input into plant communities represents a fundamental template for future plant population structure (albeit not a good proxy for reproductive success of plants), the fine scale spatial variation of seeds at the forest floor, its temporal variation with different sizes of seed crops, and its consequences for tree recruitment are poorly understood. This is partly because of limited data on fine scale spatial variation of seed deposition.

Methods

We established 25 seed traps (0.24 m2) in two study plots, one ha each. For a description of the plots, see e.g. Gratzer et al. (2021) (OIKOS, doi: 10.1111/oik.08826). Seed traps were covered with a wire mesh with a mesh width of 1 cm to avoid seed predation of rodents in seed traps. After preliminary data collection in 2003, we continuously monitored seed rain from 2006 – 2018. Traps were emptied multiple times (once in autumn and once in spring, in three years twice in autumn) throughout the annual cycle, and seed counts were associated with the last seed drop season. Starting in 2008, we identified non-viable (empty) and insect-damaged beech seeds that were predated prior to dispersal in the tree crown (hereafter “predated”) to determine the degree of pollen limitation and predispersal predation (Nilsson & Wästljung 1987).

This study is part of the research project “Sporadic seed production in mast seeding trees”, P30381 of the Austrian Science Fund (FWF). Recordings were started in the framework of the FWF research project ‘Forest dynamics in old growth spruce-fir-beech forests’, P14583.

Usage Notes

File

Description

Beech_jo

Beech seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

Uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, Jo=Josef

Beech_mw

Beech seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, MW=Mayer-Wegelin

Fir_jo

Fir seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

Uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, Jo=Josef

Fir_mw

Fir seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

Uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, MW=Mayer-Wegelin

Spruce_jo

Spruce seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

Uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, Jo=Josef

Spruce_mw

Spruce seeds, plot Josef;

,"uid","species","year","seeds_abs","seeds_m2","area"

Uid: identifier; species: Bu=beech; year: year of seed production; seeds_abs: nr. of sound seeds (not including hollow seeds and seeds with signs of insect or rodent predation); seeds_m2: seeds per m²; area: research plot, MW=Mayer-Wegelin

Trap_coords_jo

Local coordinates of seed traps, plot Jo

Trap_coords_mw

Local coordinates of seed traps, plot MW

Note: R is the preferred program for viewing the data files

Funding

Austrian Science Fund, Award: P30381, P14583