Diversity of Life Bryophytes
Diversity of Life Bryophytes 210
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This 3 page Class Notes was uploaded by Jacob Erle on Friday October 30, 2015. The Class Notes belongs to 210 at Syracuse University taught by Dr. Justine Weber in Fall 2015. Since its upload, it has received 51 views. For similar materials see Diversity of Life I in Foreign Language at Syracuse University.
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Date Created: 10/30/15
Diversity of Life I Notes Week 9 102715 List Part of Bryophytesl Sphagnum peat moss has peat layer which are most often seen in bog wetlands where decomposition doesn t occur as readily low oxygen l makes for good preservation concentrated mostly at northern latitudes boreal regions This 1 genus makes up 12 of Earth 5 plant surface and more than 2 of all our plant diversity Brvoosida the true mosses make up 95 of all species of moss Synapomorphy of Bryopsida is spore capsule has peristome teeth ridges that are alternating depending on hydrophobic or h ydrophiic conditions teeth will open up when it s dry and close up when moisturehumidity is higher Spor0phvte is dependent on damet0phvte gametophyte has placenta for nutrients obtained via diffusion lsee Generalized Moss Life Cycle Polytrich um Introduction to Bryophytesl Water Relations in Mosses Remember bryophytes DON T have true vascular tissue poikilohydric hydration state is controlled by external environment many mosses are desiccation tolerant resistant to decomposition mechanical damage photosynthesis only happens when hydrated amp illuminated especially for mosses Examples of water conservation adaptations externally assembages of shoots can increase capillary space and decrease surface area exposed and rate of evaporation mosses grow close to substrate l reduces exposed surface area to wind heat most mosses are only a few inches tall thin tissues limit need for complex transport increase capillary space on individual rametsshoots eaf shape concave or quotcuppedquot eaf arrangement where and how attached to stem imbricateoverlapping leaves eaf textures bumps creasesplicate stem fringe specialized rhizoids or leaves Endohydric mosses have simple conducting tissues for water amp nutrients still not true xylem phloem Mosses are the amphibians of the plant world Bryophyte Habitats most abundant in moist habitats temperate some tropical rainforests some can tolerate severe stresses heat cold elements often successful in habitats where vascular plants which have a root system are excluded top of rocks ice very widespread alongside vascular plants opportunistic expoit transient habitats quotphotosynthetic opportunistsquot will start production even if ground is frozen if snow has melted off them Ecosystem Roles Successional Roles primary succession colonizers seed bed for other plans soi stabilization nutrient cycling wetland formation Biological Interactions invertebrate habitat water bears nest material for birds food source not especially nutritious Mosses and Humans Traditional uses insulation bedding diapers medicinal bandages mosses are antimicrobial indigenous uses camas baking salmon drying Economic importance Peat fuel source horticulture Scotch whisky carbon sink or source commercial exploitation for decorative use water puri cation ecoogica monitoring Conservation Threats habitat loss mosses are very substrate speci c take away what they grow on they don t do well commercia harvesting END OF NOTES
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