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Abstract Detail



Ecology

Laushman, Roger H [1], Burg, Anika [2], Loke, Elena [2], Takagi, Yuta [2].

Ecology of Vitis riparia in a northeast Ohio forest: age-size distribution and recruitment.

Research on native temperate-zone vines (lianas) is rare compared to tropical species. Finding no published accounts of age-size distribution for Vitis riparia, we sampled vines in a northeast Ohio forest that was previously surveyed for tree, sapling, and seedling data four times (1974, 1986, 1998, and 2015). Thirty-three permanent study plots (each 20x20m with four 5x5m and four 1x1m subplots for trees, saplings, and seedlings, respectively) are within the Vermilion River Reservation of Lorain County Metro Parks. The site includes upland (with an old field area maintained as a playing field prior to 1950), slope, and floodplain habitats (last disturbed by a 250-year flood in 1969). Grape vines are common in the floodplain and upland sites, especially in the old field plots. We used increment core samples to determine the ages of 20 vines and to correlate age with size (r = 0.81; p = 2.84x10-5) and to generate an equation for estimating age based on vine diameter [age = 0.631 x diameter (mm) – 3.05]. We then sampled 20 vines in each of five sample plots (two floodplain, two upland, and one old field; vines were essentially absent from the slope plots), and recorded the species and diameters (DBH) of host trees. We found that vine size is positively correlated with tree size (r = 0.40; p = 1.7x10-4), with the oldest vines in the floodplain (10 – 86 yrs) where they are associated with Liriodendron tulipifera, slightly younger in the upland (10-70 yrs), associated with Acer saccharum, and youngest (10-40 yrs) in the old field plot. Because young vines regularly branch from older vines, we used information from sapling and seedling data of previous surveys to better understand how vine structure might be changing in this forest. The 1974 survey reported just a single Vitis sapling and no seedlings, while the 1986 survey reported eight saplings and one seedling. The 1998 and 2015 surveys reported no saplings or seedlings. In 1986, photographs were taken of each plot, which we used to count grape vines and compare with photos taken from the same positions in 2016. We found insignificant changes in vine numbers and distribution, with eight plots increasing, eight decreasing, and 17 remaining the same. Our observations support the understanding that disturbance is required for grapevine recruitment. Subsequent surveys will focus on disturbed areas associated with high ash loss due to the emerald ash borer.


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1 - Oberlin College, Biology Department, Oberlin, OH, 44074, USA
2 - Oberlin College, Biology Dept., 119 Woodland Street, Oberlin, OH, 44074, USA

Keywords:
Vitis riparia
age-size structure
Recruitment
succession
forest ecology.

Presentation Type: Oral Paper
Session: 15, Ecology Section: Forest Ecology
Location: 104/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 8:30 AM
Number: 15003
Abstract ID:724
Candidate for Awards:None


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