Recorded monads in Cambridge

For the purposes of recording for "A Natural History of Cambridge" the city can be regarded as the 8x8km grid from TL4261 in the north-west to TL4954 in the south-east. A well recorded Cambridgeshire monad will normally have at least 100 species. The actual median for monads with records is around 80, showing that most monads are under-recorded. Urban areas usually have more than this. For the Atlas 2020 recording period of 2000 to 2019 the median number for this area was 295 (315) species, with a lower quartile of 252 (258) species and an upper quartile of 411 (426). The range for this core area is from 163 (168) to 676 (711) species. For some statistics a hectad is a useful area, so species totals for the marginal kilometre are also shown, which reduces the median to 256 (265) species, with a lower quartile of 189 (193) species and an upper quartile of 363 (369). The post 2000 totals are given first, with the overall totals in brackets. Recording for the project was completed at the end of 2019 and figures were updated on 2019 December 10 using data from the BSBI DDb.

TL	41	42	43	44	45	46	47	48	49	50
62	160	223	129	187	140	235	513	306	205	118
61	194	300	192	337	233	396	418	234	181	237
60	138	278	264	254	265	243	565	260	168	144
59	206	500	564	363	333	559	476	369	258	263
58	338	526	609	711	481	425	579	193	259	115
57	339	192	267	658	526	308	385	424	283	156
56	171	208	258	361	365	278	274	505	261	167
55	196	240	467	265	449	361	254	449	170	107
54	164	226	426	328	356	341	284	315	301	100
53	117	140	391	194	164	182	146	358	507	203

TL	41	42	43	44	45	46	47	48	49	50
62	158	220	128	180	137	226	459	278	197	118
61	184	291	191	328	225	363	368	216	180	224
60	136	272	261	251	260	241	549	255	163	131
59	204	497	555	344	305	514	459	365	256	250
58	336	522	601	676	469	388	563	191	246	113
57	339	189	261	618	481	295	366	370	256	147
56	169	207	252	355	340	274	274	484	245	161
55	189	230	448	263	411	355	253	422	170	106
54	153	216	421	313	347	329	268	288	265	93
53	117	122	375	193	162	163	144	217	484	196

Monads with red edges were covered by CNHS field studies. Monads TL4258, 4259, 4358 and 4359 formed the CNHS survey of West Cambridge in 2014; TL4457 and TL4557 were the CNHS survey area of Coe Fen in 2015; TL4355, 4356 and 4456 (Grantchester Meadows) were covered in 2016, TL4658, 4758 and 4759 (Coldham's Common) in 2017; TL4659, 4759, 4859, 4760 and 4860 (Ditton Meadows) in 2018 and TL4756, 4856 and 4855 (Cherry Hinton) in 2019. TL4458 includes the Backs and several college gardens. TL4758 includes Coldham's Common. TL4858 is largely occupied by Marshall's Airfield. There is not much publicly accessible land in TL4955 or TL5054.