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Hybrid crappie (Pomoxis annularis × nigromaculatus) have been cultured and occur naturally. [22] The crossing of a black crappie female and white crappie male has better survival and growth rates among offspring than the reciprocal cross does. [22] Hybrid crappie are difficult to distinguish from black crappie by appearance alone.
The black crappie (Pomoxis nigromaculatus) is a freshwater fish found in North America, one of the two types of crappies. It is very similar to the white crappie (P. annularis) in size, shape, and habits, except that it is darker, with a pattern of black spots. Alternate names for the species include calico bass, speck, speckled perch, speckled ...
The white crappie has six dorsal fin spines, whereas the black crappie has seven or eight dorsal fin spines. [7] White crappies are also slightly more elongated than black crappies. [8] The white crappie is a deep-bodied fish with a flattened body, or a depth that is one-third of the length of the fish.
Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not differ significantly at high tide and low tide, and around which a tidal crest circulates once per tidal period (approximately every 12 hours). The tidal amplitude increases, though not uniformly, with distance ...
The formation of this harbour has occurred due to active erosional processes on an extinct shield volcano, whereby the sea has flooded the caldera, creating an inlet 16 km in length, with an average width of 2 km and a depth of −13 m relative to mean sea level at the 9 km point down the transect of the central axis. [5]
An icon representing the concept of location. In geography, location or place are used to denote a region (point, line, or area) on Earth's surface.The term location generally implies a higher degree of certainty than place, the latter often indicating an entity with an ambiguous boundary, relying more on human or social attributes of place identity and sense of place than on geometry.
Regional geography is also a certain approach to geographical study, comparable to quantitative geography or critical geography. This approach prevailed during the second half of the 19th century and the first half of the 20th century, a period when then regional geography paradigm was central within the geographical sciences.
The exact application of a toponym, its specific language, its pronunciation, and its origins and meaning are all important facts to be recorded during name surveys. Scholars have found that toponyms provide valuable insight into the historical geography of a particular region.