OCEANOGRAPHY & MARINE SCIENCE

An extensive series utilizing many multiple
images to present a comprehensive and
integrated approach to the total spectrum
of marine biology and oceanography. Solid
science wonderfully detailed!

ESTUARIES, SALT MARSH, MANGROVES
Where freshwaters reach the sea--the incredibly fecund nursery areas where much of the life of the sea begins. 4 pgms. 132 slides and guides.
EPSS-0850X SLIDES
$179.95

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SAVE OVER $54.00 ON 4 SLIDE SET BUNDLE ORDER EP #SS-0850X.....$179.95
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ESTUARIES Slides order #SS-0850S.....$49.95

Introduces the dynamic environments created in regions where freshwater rivers
and streams flow into the ocean. Looks at estuarine circulation, zonation and the various
creatures living in this habitat. Also considers the long-range effects of natural and
human forces on estuaries. 20 frames, cassette & guide. (Filmstrip SS-0850F....$15.00.)

CONTENT SAMPLE: 1. Broadly defined, estuaries are places where freshwater
rivers and streams flow into the ocean. Estuaries are dynamic environments. Suspended
sediments from land erosion enter with the constant current of fresh water. Some of the larger
particles are deposited in quiet waters, forming deltas and bars. These are reworked twice a day
as the high tide enters the estuary from the seaward side, sometimes carrying marine sediments
with it. Thus the contours of an estuary are constantly reworked and shifted. The transience of
estuarine environments is indicated by the scarcity of true estuarine sedimentary rocks.

Living organisms must be able to maintain their positions in the estuary; rooted plants
and burrowing animals predominate. Estuarine plants and animals must also be able to
withstand changes in salinity. Estuaries are basins in which river water and ocean water mix.
The salinity of estuarine waters depends upon interactions between the river current and the
ocean tides. These interactions vary with time, and a particular location in an estuary may
experience a complete transition from fresh water to salt water within a twelve-hour period.

Despite these rigorous conditions, estuaries are among the most productive of the world's
biomes. As transition zones between land and sea they support populations of terrestrial,
freshwater, and marine plants and animals.
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THE TREE THAT WALKS IN THE SEA--THE RED MANGROVE Slides order #253.....$42.50

The history and life story of this unique, land-building tropical evergreen and the
many brackish water life forms that shelter and reproduce among its sturdy prop roots.
Pictures include trees, radical, roots, molluscs, algae, fish and birds. 20 slides, guide.

CONTENT SAMPLE: 20245 As the mangrove root system grows, it becomes more
tangled, extensive and almost impenetrable. It acts like a sieve and bits of driftwood, shell
fragments, seaweeds, grasses, dead organisms and leaves--practically anything that can be
carried by water--collects and gets trapped. At the same time, the trees, the roots and the
trapped debris provide food and dwelling places for various bacteria, fungi and algae. Spring and
summer rains falling upstate and storms from the Caribbean move in silts, mud and organic
detritus that gets trapped as well, so that there is a gradual build-up of nutrient rich soils and
sediments, and land is built around the mangrove roots.
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THE SALT MARSH BIOME Slides order #117......$42.50

A detailed study of this most fertile of all biomes. Explains important
interrelationships of the aquatic food chain with special emphasis on the role of Spartina
grasses, surveys the plant and animal resources of the salt marsh and the importance of
these areas to continuing bountiful life in the sea. Coverage includes tidal cycles,
Spartina, glasswort, and insects. 20 slides and detailed guide.

CONTENT SAMPLE: 20929 If one could draw a line to separate salt marsh areas from
normal dry-land areas, the line would follow the tideline, the edge of the incoming ocean tides and
waves. It would follow the banks of the many tidal streams which flow into the ocean, and would
trace the edges of coastal areas which have no rivers or creeks.

The extent to which a marsh thrusts inland depends on the surrounding terrain, and
therefore changes as that terrain changes. Nature, man, or both acting together, can cause
these changes. Wind and water erosion can bring down tens of thousands of tons of top soil and
raise the level of the marsh land above the reach of the tide. The marsh grasses themselves can
act as a dam against which this buildup can progress.

REVIEWS: "The slides have been carefully chosen...well written.... Highly recommended
for instruction at the secondary level and for independent study at the college level." Previews.
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FRESHWATER AND SALT MARSHES Slides order #SS-1090S.......$99.95

Describes and illustrates the various types of marshes, how marshes are
formed, and the plants and animals common to these very fertile, important, wetland
habitats. In-the-field recordings of many birds and amphibians provide an added
dimension to the photographs. 72 frames, cassette and guide. Slides, video or filmstrip.
(Video order #SS 1090V.....$79.95, filmstrip order #SS-1090F.....$49.95.)

CONTENT SAMPLE: 9. Extensive marshes may also occur along sea coasts where
the terrain is flat and there is some protection from high winds and waves. These marshes are
also very productive, since the rising and falling tides periodically replenish mineral nutrients and
food items.

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RELATED PROGRAMS WORTH NOTING
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SALT MARSHES--A SPECIAL RESOURCE Video order #FV-1017V......$79.95

A scientifically accurate but simple and relatively nontechnical presentation that
details the intricacies of this special biome. Topics include: major grasses and flowering
plants, lavish food production capacity, invertebrates, vertebrates, impact of man,
economic importance, aesthetic and recreation considerations. 2 parts, detailed 27 page
guide. Video or filmstrips. (Filmstrips (2) order #FS-1017F ......$59.95.)

CONTENT SAMPLE:

64. From a biological standpoint, acre for acre, salt marshes are among the most
productive areas on earth because of the tremendous quantity of grasses and the availability of
minerals and nutrients from the sea.

65. Light energy, from the sun, is captured by the grasses and converted to food energy
by photosynthesis. It has been estimated that one acre of salt marsh, in a year, can produce up
to ten tons of organic matter.

REVIEWS:

**** "RECOMMENDED FOR PURCHASE WITHOUT RESERVATION." Media Review

"Highlighted by unobstructed close-ups of the plants and animals that reside in these
vanishing spots, the filmstrips are guided by a welcome narration that explains...these
remarkable regions.... Will build an appreciation for these singular environments among high
school students." Booklist.

"...an excellent introduction to the salt marsh...suitably paced for serious study."
Science Books & Films.
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~1050-094~ Red and green grasswort--salt marsh. photo by Educational Images Ltd.

Copyright (c) MCMXCVII Educational Images Ltd., Elmira, NY, USA. All rights reserved.

EDUCATIONAL IMAGES LTD.

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