sympatricadj.

1904 E. B. Poulton in Trans. Entomol. Soc. 5 p. xc Forms found together in certain geographical areas and not in other areas. Such groups may be called Sympatric.

1942 E. Mayr Systematics & Origin of Species vii. 149 The gaps between sympatric species are absolute, otherwise they would not be good species; the gaps between allopatric species are often gradual and relative.

1958 Canadian Jrnl. Zool. 36 148 Reproductive isolation is more likely to be present between closely related sympatric species than between closely related allopatric species.

1974 Nature 16 Aug. 540/1 The two species are sympatric throughout much of their range.

1978 Nature 21 Sept. 256/1 White makes a good argument for sympatric speciation on small oceanic islands with many species and also for allochronic speciation.

1970 S. Afr. Jrnl. Sci. 66 392/1 The two species have been found to occur sympatrically over a depth range of 14 to 33 metres.

1975 Jrnl. Zool. 177 330 True polymorphism is thus restricted to multiple forms of a species which regularly occur sympatrically (and synchronically) within a population.

1904 E. B. Poulton in Trans. Entomol. Soc. 5 p. xc The occurrence of forms together may be termed Sympatry, and the discontinuous distribution of similar forms Asympatry.

1968 Amer. Mus. Novitates No. 2349. 6 The grasslands of this region are generally similar to those of the area of sympatry west of Bahía Blanca.

1973 Nature 9 Feb. 406/2 The planting of dense agricultural stands of larval foodplants..[is] believed to have affected the species' geographical ranges and abundances, causing extensive sympatry over much of the eastern United States.