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1,153 results for “Ferns”
Fern Understory as an Ecological Filter at Harvard Forest 1993-1995
We investigated the role of the fern understory as an ecological filter that influences the organization of the tree seedling bank in New England deciduous forests. The data files below summarize a series of field experiments conducted from 1993 to 1995 evaluating the response of seed germination and seedling growth and survival to experimental understory manipulation. These field studies involved three experimental manipulations of the fern understory: 1) removal of ferns 2) ferns tied back (to remove above-ground shading) 3) ferns left intact (control). These manipulations were established in 180 - 1m2 plots spanning six field sites and 2 different fern species (3 understory manipulations x 2 understory fern species x 6 sites x 5 replicates/site = 180 experimental plots).
Fern distribution in El Verde CREST plots
A fern survey was done of the plots established by under CREST funding to assess controls on primary productivity along an elevational gradient. The control plots (CP), fertilized plots (FP) and plots where only leaf litter (ll) was removed at El Verde were survey and all ferns present in the plots listed, mapped and measured in Fall of 1995, several years after the initial fertilization and leaf litter treatment had been applied. The objective was to determine the extent to which the fern flora had been affected by the treatments. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Ferns surveys of individuals of terrestrial ferns in Canopy Trimming Experiment (CTE) plots document changes in species richness and abundance over time in response to canopy opening and/or debris deposition
Whole plot surveys of Canopy Triming Experiment (CTE) plots were done to detect changes in the number of terrestrial fern species and individuals in response to canopy opening and debris deposition. Surveys were conducted annually prior to and after treatments. A count of all terrestrial ferns, identified to species on the CTE plots was recorded for each subplot in January during CTE1 (2002-2010) and in the fall during CTE2 (2014-present). The surveys document losses of individuals of shade tolerant fern species and the appearance of open canopy ferns such as the tree fern Cyathea arborea. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Fern leaf traits observation at the Luquillo Experimental Forest (LEF)
Ferns are a common element of the understory of forests, yet little is known about the dynamics of leaf production. The long-term role of an individual fern in the ecosystem understory is a function of the number and size of leaves produced over time and the quality of those leaves. Selected functional plant traits (see also LUQ186 -Fern nutrients) were measured in order to supplement non-destructive measurements and detect patterns of primary productivity of ferns in the long-term studies at the Luquillo forest where ferns have been included (eg. Fern growth and demography (LUQ75), Canopy Trimming Experiment (LUQ143 and LUQ146) and the Luquillo Forest Dynamics Plot). Among the important characteristics of fern leaves in the forest understory are the area and biomass of leaves needed to calculate specific leaf area (SLA), leaf dry-matter content (LDMC) and leaf shrinkage. Therefore a large sample of whole leaves and leaf material from several species in the Luquillo Experimental Forest understory was collected, weighed and leaf area measured. The means and regression relationships among these functional traits for species, leaf type and leaf size can then be used to estimate leaf production and turnover rates in temporal studies of fern growth. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Fern leaf nutrients observation at the Luquillo Experimental Forest (LEF)
Ferns are a common element of the understory of forests yet little is known about the dynamics of leaf production. The long-term role of an individual fern in the ecosystem understory is a function of the number and size of leaves produced over time and the quality of those leaves. Selected functional plant traits (see also LUQ186 -Fern nutrients) were measured in order to supplement non-destructive measurements and detect patterns of primary productivity of ferns in the long-term studies at the Luquillo forest where ferns have been included (eg. Fern growth and demography (LUQ75) Canopy Trimming Experiment (LUQ143 and LUQ146) and the Luquillo Forest Dynamics Plot). Among the important characteristics of fern leaves in the forest understory are the area and biomass of leaves needed to calculate specific leaf area (SLA) leaf dry-matter content (LDMC) and leaf shrinkage. Therefore a large sample of whole leaves and leaf material from several species in the Luquillo Experimental Forest understory was collected weighed and leaf area measured. The means and regression relationships among these functional traits for species leaf type and leaf size can then be used to estimate leaf production and turnover rates in temporal studies of fern growth. Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.
Fern sporophyte growth observation at the Luquillo Experimental Forest (LEF)
Long-term (20-year) monitoring sites have been established in the Luquillo Experimental Forest. Individuals of approximately 20 species of ferns are being monitored on a regular basis to determine plant life history classes, leaf production rates, fertility characteristics and leaf damage levels. Effects of natural disturbance will be interpreted in light of these parameters. The study includes sites at El Verde, and Espiritu Santo and Bisley watersheds. A comparative study of ferns in the mangrove community at the Jobos Bay National Estuarine Research Reserve was started in January 1998 and completed in January 2001. Comparisons of similar species will also be made at temperate sites. Data file FERNGROWTH contains data, on a line-line basis, about individual leaves. Information in this file includes measurements and observations as well as leaf location and identification information. Leaves in this file was monitored three times a year from the time the plant was first included in the study until the plant died, disappeared, or was dropped from the study. The same information was collected on leaves used in defoliation experiments (FERNDEFO). Annual measurements of leaf counts and longest leaf measurements on selected species from 2001 through 2010 are included in FERNPH02. Other files in the data set includes a file of supporting information on characteristics the plants on which leaf observations were made (FERNSEQ), additional field observations about the leaves, plants and sites (FERNFLD) and details about monitoring dates (FERNDATES). Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Serv
Fig. 31. Paracletus cimiciformis von Heyden, 1837 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 31. Paracletus cimiciformis von Heyden, 1837. Aptera in nest of Tetramorium caespitum (Linnaeus, 1758).
Fig. 29 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 29. Neomyzus circumflexus (Buckton, 1876). Aptera. (from Dransfield & Brightwell 2015, licensed under Creative Commons Attribution 3.0, downloaded 30 Jun. 2015).
Fig. 24. Aphis beccabungae Koch, 1855 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 24. Aphis beccabungae Koch, 1855. Apt. and juv. on Galeopsis speciosa. A. beccabungae is very similar to A. gossypii Glover, 1877.
Fig. 27 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 27. Sitobion avenae (Fabricius, 1775). Apterae and juveniles on A. Dactylis glomerata and B. Elytrigia repens.
Fig. 19 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 19. Gootiella, Pachypappa and Pachypappella. Apt. alienicolae (born on secondary host). A–B. Spinal wax gland on abd. terg. 6 of Pachypappa populi (Linnaeus, 1758) (A) and P. vesicalis Koch, 1856 (B). C. Hind leg of Gootiella tremulae Tullgren, 1925. D–G. Hind tibia and tarsus of Pachypapella lactea (Tullgren, 1909) (D), Pachypappa tremulae Tullgren, 1925 (E), P. populi (Linnaeus, 1758) (F) and P. vesicalis Koch, 1856 (G). A–B and D–G after Carter & Danielsson 1991, C after Danielsson 1990b. All modified.
Fig. 21 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 21. Prociphilus xylostei (deGeer, 1773). A–B. Apt. on mycorrhizal Picea abies roots under Pleurozium schreberi.
Fig. 20 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 20. Pachypappa populi (Linnaeus, 1758). Apt. from mycorrhizal Picea abies root in the moor layer of a shady spruce forest.
Fig. 22 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 22. Prociphilus pini (Burmeister, 1835). A. Colony on thin Pinus sylvestris root in the moor layer of a pine forest on rock. B–C. Apt. from Polytrichum commune sample.
Fig. 14 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 14. Muscaphis cuspidata (Stroyan, 1955). A–B. Apt. on Brachythecium rivulare. C. Ovip on Brachythecium rivulare.
Fig. 9 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 9. Pseudacaudella rubida (Börner, 1939). A. Apt. and juv. from Hylocomium splendens sample (grid 1 mm). B. Apt. and C. hibernating juv. on Pleurozium schreberi. D–E. Hibernating juv on Calliergon cordifolium.
Fig. 11. Jacksonia papillata Theobald, 1923 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 11. Jacksonia papillata Theobald, 1923. Aptera (photo Roger Blackman, from Blackman 2010, with license from The Royal Entomological Society).
Fig. 7 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 7. Decorosiphon corynothrix Börner, 1939. A. Apt. and juv. in Polytrichum commune sample. B. Apt. on Sphagnum magellanicum (with interpersed Polytrichum strictum). C. Apt. juv. on Polytrichum commune. D. Apt. juv. on S. magellanicum, showing rupture line.
Fig. 4 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 4. Dioecious one-year holocycle accompanied by a continuous anholocycle on the secondary host, e.g., Pachypappella lactea (leaf galls on aspen, Populus tremula; roots of spruce, Picea abies) or Tetraneura ulmi (leaf galls on elm, Ulmus; subterraneous parts of grasses, Poaceae). Zones as in Fig. 3. In some years the Finnish populations on the primary hosts (for P. lactea in South Finland) may be more or less absent, and their existence is dependent on the populations on the secondary hosts.
Fig. 5 in Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea)
Fig. 5. Dioecious two-year holocycle in Adelgidae, e.g., Adelges laricis (shoot galls on spruce, Picea; needles of larch, Larix). All females oviparous. The fundatrix (hatched from a fertilized egg) overwinters as a larva, and induces the formation of a pineapple-like gall on the primary host. All her offspring are alate (gallicolae) and migrate to the secondary host, where they lay eggs on the needles. The aphids hatching move to the twigs where they hibernate as young larvae (the 'neosistens' stage). In spring they move back to the needles and become adults (sistentes). Their offspring are either alate sexuparae and migrate to spruce, or apterous 'progredientes'. In autumn the sexuparae fly to spruce and lay eggs which become sexual females and males, which mate. The females then lay eggs out of which new fundatrices hatch.
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