New Jersey Scuba Diving

With rare exceptions, scuba diving is a bottom-fixated activity. In the region covered in this website, one may encounter many different bottom types, from rocky pinnacles around Block Island to white sands off Cape May to mud and oyster beds in any estuary. This variation is far greater and more interesting than is found in the tropics. Here is some explanation of what bottom compositions are found where and why:

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We seldom consider the water we dive in, yet it is a fascinating subject in its own right.

Basic Chemistry

Water is an odorless, tasteless, transparent liquid that is colorless in small amounts but exhibits a bluish tinge in large quantities. It is the most familiar and abundant liquid on earth. In solid form ( ice ) and liquid form it covers about 70% of the earth's surface. It is present in varying amounts in the atmosphere. Most of the living tissue of a human being is made up of water; it constitutes about 92% of blood plasma, about 80% of muscle tissue, about 60% of red blood cells, and over half of most other tissues. It is also an important component of the tissues of most other living things.

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Here is an abbreviated classification or taxonomy of all the organisms presented in this website, as well as a few others of interest. This is not meant to be a complete listing of all living things, nor even a completely correct one, since these classifications change as new theories come into favor. One should realize that every one of the groupings presented below is a judgment call representing collective scientific opinion, rather than a hard fact.

The classification of living things into groups depends not only on their differences and similarities but also on the degree to which they are studied and understood. For example, lesser-studied types such as mollusks tend to be lumped together into broad classifications, while popular and easily-studied types tend to be divided into fine distinctions. For a prime example of this, pick up any field guide on birds, and see how many Warblers there are in it. Birds are widely considered to be "over-split" - divided into many different species and families that are really not different. Coincidentally, bird-watching is an extremely popular pastime among scientists and laymen alike. Conversely, mollusks are probably "under-split", but then mollusk-watching is no fun at all.

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An invertebrate is any multicellular animal lacking a backbone. This includes all animal phyla other than Chordata. The major invertebrate phyla include:

• Sponges - Porifera
• Coelenterates - Cnidaria
• Ctenophores - Ctenophora
• Echinoderms - Echinodermata
• Flatworms - Platyhelminthes
• Roundworms - Nematoda
• Segmented worms - Annelida
• Mollusks - Mollusca
• Arthropods - Arthropoda

Invertebrates are tremendously diverse, ranging from microscopic wormlike mezozoans to huge animals such as the giant squid. Approximately 95% of all the earth's animal species are invertebrates; of these, the vast majority are insects and other arthropods. Invertebrates are important as parasites and are essential elements of all ecological communities.

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Algae and plants are similar in that they can produce their own food from nutrients and sunlight by photosynthesis. The main difference between the two is in their complexity. Algae are simple organisms, sometimes unicellular, and even the largest types are relatively simple in structure. True plants, on the other hand, are quite complex, with many specialized structures, even in the smallest types.

Fungi are not plants, they do not produce their own food, but rather feed upon decaying matter. But neither are they animals, so I tacked them on here.

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