relative species abundance is the measure of the number of different species present in an area.
relative species abundance is the measure of the number of different species present in an area.
what is the measure of the number of different species present in an area?
relative species abundance
the wetlands function as a seasonal fish nursery for lake ontario, and despite the historical degradation, most historical species of fish can still be found using the marsh in increasing numbers. as with birds and plants the location is a biodiversity hotspot for canada with over 60 species present. each spring thousands of spawning fish migrate in through the fishway from the harbor and lake, laying eggs and leaving shortly after, allowing the marsh to function as a giant fish hatchery. annually between 5 and 20 million fish are produced for the lake depending on water levels and water pollution events. the species present reflect the degraded marsh habitat with the most common the gizzard shad (formerly carp). also common are night time predators species channel catfish and brown bullhead, along with invasive species such as alewife and white perch. popular angling species present in limited numbers include pike, largemouth bass, and yellow perch, but the large adults are only present in the marsh during the spawning season which is closed to fishing. the spring and fall season also brings several migrating salmon and trout to the marshes main inflowing river.
cootes paradise
this is a list of ants of great britain, including endemic and introduced species. compared with much of the rest of europe, great britain has a smaller number of ants. the size and diversity of ant species in any area is largely determined by the highest summer soil temperature, and this being so, it is not surprising that the greatest concentration of different species is centred in the warmer parts of the country – dorset, hampshire, surrey, the isle of wight and kent being the 5 richest counties, with 33, 31, 29, 27 and 26 different species present respectively.
list of ants of great britain