Littoral Vegetation (Macrophytes) Table 7.3 Species Water fern (Azolla sp.) Arrowhead (Syngonium sp.) Water cabbage (Pistia sp.) Water hyacinth (Eichhornia crassipes) Vetiver grass (Chrysopogon zizanioides) Cattails (Typha sp.) Water lily (Victoria sp.) Hydrilla (Hydrilla verticillata) Individua I Count 10 12 8 20 24 14 10 8 Classification Abundance Rank

Littoral Vegetation (Macrophytes) Table 7.3 Species Water fern (Azolla sp.) Arrowhead (Syngonium sp.) Water cabbage (Pistia sp.) Water hyacinth (Eichhornia crassipes) Vetiver grass (Chrysopogon zizanioides) Cattails (Typha sp.) Water lily (Victoria sp.) Hydrilla (Hydrilla verticillata) Individua I Count 10 12 8 20 24 14 10 8 Classification Abundance Rank

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter27: Plant Tissues

Section: Chapter Questions

Problem 1DAA: Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of...

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Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.23). FIGURE 27.23 A 2.129-year annual precipitation record inferred from com pled tree ring data in El Malpais National Monument Now Mexico. Data ware averaged over 10-yeer intervals; graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: O, normal rainfall increasing numbers mean increasing excess of rainfall decreasing numbers mean increasing severity of drought A severe drought contributed to a series of catastrophic dust stem's that turned the rid western United States into a oust bow between 1933 and 1939. 2. One of the worst population catastrophes ever recorded occurred in Mesoamerica between 1519 and 1600 a. d., when around 22 million people native to the region died. Which period between 137 B.C. and 1992 had the most severe drought? How long did that drought last?
Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.23). FIGURE 27.23 A 2.129-year annual precipitation record inferred from com pled tree ring data in El Malpais National Monument Now Mexico. Data ware averaged over 10-yeer intervals; graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: O, normal rainfall increasing numbers mean increasing excess of rainfall decreasing numbers mean increasing severity of drought A severe drought contributed to a series of catastrophic dust stem's that turned the rid western United States into a oust bow between 1933 and 1939. 1. Around 770 A. D., the Mayan civilization began to suffer a massive population loss, particularly in the southern lowlands of Mesoamerica. The El Malpais tree ring data show a drought during that time. Was it more or less severe than the dust bowl drought?
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