Is the vertical distribution of meiofauna similar in two contrasting microhabitats? A case study of a macrotidal sandy beach

The vertical distribution of epiphytic bryophytes in European forests are still relatively poorly understood. The aim of the study was to analyse the diversity and vertical zonation of epiphytic mosses and liverworts on selected tree types (Quercus petraea, Betula pendula and Pinus sylvestris) within windthrow areas in the Kampinoski National Park (Central Poland). The investigations were performed in five parts of the trees: the tree base, lower trunk, upper trunk, lower crown, and upper crown. Deciduous trees have more species than pine trees (13 on Quercus and Betula, 8 on Pinus). The type of phorophyte was crucial for the differences in the species composition from the tree base to the upper crown that was observed. The highest richness of bryophytes was recorded on the tree bases, while the lowest was recorded in the upper parts of the crowns. The variability of the habitat conditions in the vertical gradient on the trunk that affected the patterns of the occurrence of species with different ecological preferences was determined using the Ellenberg indicator values. An increase in the value of the light and acidity indicators from the base of the trunk upwards and decreasing tendency in the case of moisture indicator was noted.

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The Annual Reproductive Patterns of Bathyporeia Pilosa and Bathyporeia Pelagica [Crustacea: Amphipoda]

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400004665 ◽

1970 ◽

Vol 50 (2) ◽

pp. 475-488 ◽

Cited By ~ 33

Author(s):

J. D. Fish ◽

G. S. Preece

Keyword(s):

Vertical Distribution ◽

West Coast ◽

Sandy Beach ◽

Present Report ◽

Sandy Beaches ◽

Annual Reproductive Cycle ◽

The West ◽

Reproductive Patterns ◽

Reproductive Cycles ◽

The Vertical Distribution

The genus Bathyporeia has featured in many reports on the ecology of sandy beaches, yet little is known of the annual reproductive cycles of the species in British waters. Watkin (1938,1939a, b, 1941, 1942) has studied the taxonomy and aspects of the ecology of the genus, and more recently Salvat (1967) has described the annual reproductive cycle of B. pilosa Lindstrom, B. pelagica (Bate), B. sarsi Watkin and B. guilliamsonia (Bate) on the west coast of France. The present report is the result of an investigation into the vertical distribution and annual reproductive patterns of B. pilosa and B. pelagica on a sandy beach at Ynyslas, Cardiganshire. Whilst enabling comparisons to be made with Salvat's data, this study also forms the basis for an investigation into the ecophysiological complex of B. pilosa and B. pelagica.

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Wind Erosion at a Saline Playa Environment, Ebinur Lake, Xinjiang, China - A Case Study on the Source of Saline Dust Storm

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.260-261.1003 ◽

2012 ◽

Vol 260-261 ◽

pp. 1003-1008

Author(s):

Dong Wei Liu ◽

Jilili Abuduwaili

Keyword(s):

Vertical Distribution ◽

Wind Erosion ◽

Dust Storms ◽

Aeolian Transport ◽

Near Surface ◽

Erosion Pins ◽

Dry Lake ◽

The Vertical Distribution ◽

Main Factor

In many arid and semiarid lands, dry lake beds (saline playa) represent a tremendous source of unconsolidated salt-rich sediments that are available for aeolian transport. Severe salt-dust storms caused by the erosion of such landforms have become very harmful natural phenomena. Base on texture and appearance characteristic, five principal undisturbed playa surfaces for sampling to investigate the deflation rate and the vertical distribution of material abraded using a wind-tunnel experiment in this study. Two additional field deflation monitoring transect were aslo established to examine vertical deflation by wind from measurements of erosion pins at the Ebinur (dry) Lake. The results indicate that winds greater than 8 m/s is the main factor for inducing the erosion of the playa sediments. Soft salt, aeloian sediment and alluvial deposit are the main sources of the saline dust storms in Ebinur region. The near-surface vertical distribution of material abraded concentrated in 0 -10 cm height. The annual wind erosion rate ranged from 0.48 cm to 5.6 cm in the northwest portion of the lake and from 0.24 cm to 0.96 cm in the southeast portion.

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