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Between 2001 and 2003, heightened levels of research activity resulted in an increase in the number of species registered as threatened. However, research in 2003 revealed that in the Northern Slopes Bioregion two invertebrate species were no longer classified as threatened and in the Central Highlands one invertebrate species was no longer classified as threatened.

As at May 2003, the greatest number of species that were classified vulnerable, rare or endangered were in the South East Bioregion of Tasmania, for which 342 threatened species were listed, an increase of 42 since 2001.

In 2003, the highest number of threatened invertebrate species was recorded in the Northern Slopes Bioregion (25). The Flinders Bioregion had the greatest number of threatened vertebrate species (27). The South East Bioregion had the highest number of threatened lower plant species (9) and vascular plant species (296).

THREATENED SPECIES, Tasmanian Bioregions
		Invertebrates	Vertebrates	Lower plants	Vascular plants	Total species
Bioregion(a)(b)
		no.	no.	no.	no.	no.
King
	2001	13	14	na	104	131
	2003	14	20	2	115	151
Northern Slopes
	2001	27	14	na	109	150
	2003	25	18	-	116	159
Flinders
	2001	8	20	na	198	226
	2003	9	27	-	215	251
West
	2001	21	13	na	94	128
	2003	22	17	1	84	124
Central Highlands
	2001	18	8	na	125	151
	2003	17	13	2	118	150
Northern Midlands
	2001	13	7	na	164	184
	2003	13	10	4	179	206
Ben Lomond
	2001	13	10	na	143	166
	2003	14	15	1	138	168
Southern Ranges
	2001	17	11	na	130	158
	2003	17	15	1	119	152
South East
	2001	14	16	na	270	300
	2003	17	20	9	296	342
- nil or rounded to zero na not available (a) Refer to the Map of Tasmanian Bioregions that relate to these data. (b) Species may inhabit more than one bioregion; therefore it is not appropriate to deduce state totals from these data. (c) Data available as at April 2001 and May 2003. (d) Numbers have increased for 2003 because of increased surveys, the number of new listing of species and correction of data during 2001 and 2003. Source: Department of Primary Industries, Water and Environment.