. The Canadian field-naturalist. Natural history. HARBOR ISLAND A A AAA AAA AAA1AA. Date Figure 1. Average number of Forster's Tern eggs per nest (squares) and chicks per nest (triangles) throughout the incubation and pre-fledging period at two sites in eastern North Carolina. thicket and surrounding Spartina alterniflora marsh and is located km east from mainland Cedar Is- land. Wrack lines of Spartina alterniflora and Eel- grass (Zostera marina) were deposited linearly along the edge of the marsh. An artificial nesting platform ( x m) was con- structed on Harbor Island in Apri
. The Canadian field-naturalist. Natural history. HARBOR ISLAND A A AAA AAA AAA1AA. Date Figure 1. Average number of Forster's Tern eggs per nest (squares) and chicks per nest (triangles) throughout the incubation and pre-fledging period at two sites in eastern North Carolina. thicket and surrounding Spartina alterniflora marsh and is located km east from mainland Cedar Is- land. Wrack lines of Spartina alterniflora and Eel- grass (Zostera marina) were deposited linearly along the edge of the marsh. An artificial nesting platform ( x m) was con- structed on Harbor Island in April 1992 in an attempt to improve nesting success by reducing losses due to flooding. The bottom was placed about m above the ground and covered with dead vegetative matter similar to naturally occurring wrack on the island; vegetation was pulled through in spots to make it ap- pear as realistic as possible. On Chainshot Island, fates of eggs in 50 randomly selected Forster's Tern nests (of approximately 100 nests total) were determined during the period be- tween 22 May and 7 June. Nests of 43 Forster's Terns, the total colony, on Harbor Island were monitored during the period between 17 June and 6 July. Nests were identified by mapping positions of nests relative to their placement on the wrack. After allowing several days for initiation of the colony, nest late was checked in the morning and evenings on each island to determine the relative timing of egg and hatchling loss. All nests were followed to the point of hatching or destruction. Destruction of nests was attributed to predation if evidence of nest predators was present. Nests were usually found abandoned with eggs displaying chewing in the center portion. If predated eggs were not present in the nest, they were usually present on the surrounding wrack or in runways in the surrounding grasses. Eggs that disappeared without evidence of predation were classified as unknown losses. Forster's Terns were the onl\ bird s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
