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Accueil du site → Master → Etats Unis → 2019 → The Role of Frugivores in the Dispersal and Germination of One Seed Juniper (Juniperus monosperma) Seeds in Central New Mexico

New Mexico State University (2019)

The Role of Frugivores in the Dispersal and Germination of One Seed Juniper (Juniperus monosperma) Seeds in Central New Mexico

Stricklan, Dave

Titre : The Role of Frugivores in the Dispersal and Germination of One Seed Juniper (Juniperus monosperma) Seeds in Central New Mexico

Auteur : Stricklan, Dave

Université de soutenance : New Mexico State University

Grade : Doctor of Philosophy 2019

Description
The objectives of the research within this dissertation were to evaluate the influence of frugivores on the dispersal pattern and germination of one seed juniper (Juniperus monosperma [Englem.] Sarg.) seeds in central New Mexico. Findings show mesocarnivores and then lagomorphs delivered the most total seeds to the landscape in all habitat classifications (cone trees, non-cone trees, transition zone, and grassland) except directly under the canopy of cone trees, where perching birds deposited the most seeds. Lagomorph pellets containing seeds were present in the highest percentage of plots in all habitats except around cone trees where seeds deposited in bird pellets were present in every plot. Lagomorphs are likely the most effective dispersal vectors of one seed juniper seeds. Most seeds deposited by mesocarnivores were in large clumps contained in scats. Deposition of seeds by birds was primarily under perch sites associated with cone trees. Porcupines and mesocarnivores (and in some other one seed juniper woodlands, black bears) make long range forays into grasslands and may be responsible for depositing seeds that result in "outpost" juniper in the grassland. Mean germination percentages of bare seeds (imbibed), seeds encased within frugivore delivery matrices, but not seeds subsequently freed from a frugivore delivery matrix differed significantly by frugivore group and from seeds left within the fleshy pericarp of cones (P < 0.5). The highest bare seed germination value for a frugivore group was 70.8% (mesocarnivore) and the lowest was 33.3% (bird). Seeds in cones had a germination value of 9.7%. The highest value for frugivore matrix encased seeds was 40.1% (bird) and the lowest was 5.8% (porcupine). The highest germination value for seeds in the matrix free trials, which used seeds screened from the frugivore matrix after the matrix germination trials, was 18.6% (lagomorph) and the lowest was 2.1% (porcupine). Seeds still encased within cones after the same period germinated at 6.7%. Both habitat classification and frugivore group were significant (P < .05) factors in determining differences in seed numbers at study plots.

Présentation (NMSU Library)

Aperçu document (ProQuest)

Page publiée le 13 octobre 2020