Sequence of Fruit Ripening in Bird‐Dispersed Plants: Consistency Among Years

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/119088/1/ecy1987681223.pd

Fruit Ripening Asynchrony Is Related To Variable Seed Number In Amelanchier And Vaccinium

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141235/1/ajb208467.pd

Effects of Distance to Juniperus virginiana on the Establishment of Fraxinus and Acer Seedlings in Old Fields

It has been hypothesized that Juniperus virginiana facilitates tree seedling establishment in secondary succession. To test this hypothesis, we sampled four old fields in southwestern Ohio and monitored experimentally planted seeds and seedlings of Acer saccharum and Fraxinus americana for two years. Seeds and seedlings were placed into herbivore exclosures placed 0.3 and 3.0 m from J virginiana trees in an old field in Ohio. We found a significant positive spatial association between juniperus virginiana and tree seedling densities in all four old fields. Soil temperature, soil moisture, evaporative demand and light level in the 0.3 m treatment were significantly reduced, whereas litter depth was increased. Germination of A. saccharum, but not F americana, was reduced in the 0.3 m treatment, whereas seedling survival was unaffected in either species. Growth ofF americana seedlings was reduced by proximity to J virginiana but A. saccharum growth was not affected. Stomatal conductance was reduced in the 0.3 m treatment for F americana but unaffected in A. saccharum. Although there was a positive spatial association between J virginiana and tree seedlings in the old fields sampled, experimental seedlings did not exhibit an early demographic response that indicated facilitation

A Test Of Several Hypotheses For The Determination Of Seed Number In Amelanchier Arborea, Using Simulated Probability Distributions To Evaluate Data

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141472/1/ajb208792.pd

The Soil Seed Pool of Huffman Prairie, a Degraded Ohio Prairie, and its Potential in Restoration

Author Institution: Department of Botany, Miami UniversityThe germinable seeds in the soil of a relict Ohio prairie were investigated to determine the composition and density of dicots of potential value in restoration. Soil samples were collected from three areas of the prairie with distinctive species compositions: swale, north upland, and south upland. Seed density and species composition were based on seedling emergence over 90 days

Effects of Distance to Juniperus virginiana on the Establishment of Fraxinus and Acer Seedlings in Old Fields

It has been hypothesized that Juniperus virginiana facilitates tree seedling establishment in secondary succession. To test this hypothesis, we sampled four old fields in southwestern Ohio and monitored experimentally planted seeds and seedlings of Acer saccharum and Fraxinus americana for two years. Seeds and seedlings were placed into herbivore exclosures placed 0.3 and 3.0 m from J virginiana trees in an old field in Ohio. We found a significant positive spatial association between juniperus virginiana and tree seedling densities in all four old fields. Soil temperature, soil moisture, evaporative demand and light level in the 0.3 m treatment were significantly reduced, whereas litter depth was increased. Germination of A. saccharum, but not F americana, was reduced in the 0.3 m treatment, whereas seedling survival was unaffected in either species. Growth ofF americana seedlings was reduced by proximity to J virginiana but A. saccharum growth was not affected. Stomatal conductance was reduced in the 0.3 m treatment for F americana but unaffected in A. saccharum. Although there was a positive spatial association between J virginiana and tree seedlings in the old fields sampled, experimental seedlings did not exhibit an early demographic response that indicated facilitation

Seed Dispersal of an Invasive Shrub, Amur Honeysuckle (Lonicera maackii ), by White-tailed Deer in a Fragmented Agricultural-forest Matrix

Ungulates are potentially important seed dispersers for many invasive plant species. While our understanding of which invasive plant species are dispersed by ungulates has improved over the last decade, the factors influencing this process remain poorly understood. To address this, we explored whitetailed deer (Odocoileus virginianus) seed consumption and dispersal of an invasive shrub (Lonicera maackii) in fragmented agricultural-forest matrices in western Ohio. In a pairwise browse preference experiment, deer browsed at similar levels on branches of L. maackii with fruits removed and fruits intact (mean ± 95 % CI 57 ± 14 and 62 ± 14 %, respectively). We found no evidence that white-tailed deer disperse L. maackii seeds along an invasion front, but 31 % of deer pellet groups collected in an invaded area contained germinable L. maackii seeds (maximum number of germinable seeds = 30). By combining hourly movement data specific to fragmented landscapes and gut retention time data, we projected that female deer disperse 91 %of ingested seeds further than 100 m from seed sources (i.e., long-distance seed dispersal), and rarely disperse seeds up to 7.9 km. We conclude that white-tailed deer can be important long-distance seed dispersal vectors of L. maackii, and that invader abundance and/or patch connectivity likely influence patterns of seed dispersal by white-tailed deer

Patterns of fruit drop and fruit removal in Vaccinium angustifolium.

http://deepblue.lib.umich.edu/bitstream/2027.42/53419/1/1853.pdfDescription of 1853.pdf : Access restricted to on-site users at the U-M Biological Station