Table 4.
Summary of species records, including earliest and latest observation or specimen collection date, unique occurrences (by site and year) before 1976 and after 1979, and the change in relative occurrence in unique records. Bolded records show the same relationship (i.e. increase or decrease in species prevalence) reported in Ball-Damerow et al. (2014). Records that are likely to be a result of taxonomic biases, such as failure to collect common species or spcies that are difficult to identify, and a focus on rare or charismatic species, are indicated by *.
| Family | Species | Earliest year | Latest year | Before 1975 | After 1980 | Change |
|---|---|---|---|---|---|---|
| Coenagrionidae | Argia vivida* | 1879 | 2013 | 767 | 535 | -232 |
| Libellulidae | Sympetrum corruptum* | 1892 | 2013 | 612 | 414 | -198 |
| Coenagrionidae | Enallagma annexum* | 1900 | 2013 | 268 | 134 | -134 |
| Coenagrionidae | Ischnura denticollis* | 1900 | 2013 | 256 | 126 | -130 |
| Coenagrionidae | Enallagma carunculatum* | 1900 | 2013 | 329 | 218 | -111 |
| Coenagrionidae | Amphiagrion abbreviatum | 1904 | 2013 | 168 | 70 | -98 |
| Calopterygidae | Hetaerina americana | 1879 | 2013 | 304 | 220 | -84 |
| Coenagrionidae | Argia nahuana* | 1894 | 2013 | 115 | 35 | -80 |
| Libellulidae | Sympetrum illotum | 1892 | 2013 | 270 | 205 | -65 |
| Coenagrionidae | Enallagma praevarum* | 1900 | 2013 | 103 | 67 | -36 |
| Gomphidae | Octogomphus specularis | 1900 | 2013 | 97 | 61 | -36 |
| Coenagrionidae | Enallagma civile* | 1926 | 2013 | 195 | 167 | -28 |
| Libellulidae | Pantala hymenaea* | 1912 | 2013 | 141 | 114 | -27 |
| Cordulegastridae | Cordulegaster dorsalis | 1900 | 2013 | 139 | 118 | -21 |
| Coenagrionidae | Telebasis salva | 1900 | 2013 | 86 | 63 | -23 |
| Coenagrionidae | Enallagma boreale* | 1903 | 2013 | 92 | 71 | -21 |
| Libellulidae | Paltothemis lineatipes* | 1914 | 2013 | 103 | 84 | -19 |
| Lestidae | Archilestes californicus | 1900 | 2012 | 61 | 48 | -13 |
| Libellulidae | Libellula nodisticta | 1894 | 2013 | 51 | 39 | -12 |
| Libellulidae | Libellula comanche | 1914 | 2013 | 50 | 38 | -12 |
| Lestidae | Lestes congener | 1900 | 2013 | 64 | 53 | -11 |
| Lestidae | Lestes dryas | 1910 | 2013 | 89 | 80 | -9 |
| Libellulidae | Sympetrum pallipes | 1894 | 2013 | 130 | 125 | -5 |
| Libellulidae | Leucorrhinia hudsonica | 1914 | 2013 | 42 | 32 | -10 |
| Coenagrionidae | Enallagma anna* | 1915 | 2012 | 26 | 19 | -7 |
| Coenagrionidae | Enallagma clausum* | 1938 | 2013 | 19 | 12 | -7 |
| Libellulidae | Plathemis subornata | 1915 | 2013 | 34 | 28 | -6 |
| Libellulidae | Sympetrum danae | 1914 | 2013 | 33 | 27 | -6 |
| Coenagrionidae | Ischnura barberi | 1897 | 2013 | 59 | 55 | -4 |
| Gomphidae | Ophiogomphus bison | 1907 | 2013 | 58 | 55 | -3 |
| Libellulidae | Sympetrum obtrusum | 1914 | 2013 | 39 | 36 | -3 |
| Libellulidae | Libellula croceipennis | 1914 | 2013 | 22 | 19 | -3 |
| Aeshnidae | Aeshna walkeri | 1900 | 2013 | 41 | 40 | -1 |
| Lestidae | Archilestes grandis | 1897 | 2012 | 25 | 24 | -1 |
| Libellulidae | Erythemis collocata* | 1900 | 2013 | 216 | 227 | 11 |
| Libellulidae | Sympetrum semicinctum | 1909 | 2013 | 61 | 63 | 2 |
| Coenagrionidae | Coenagrion resolutum | 1914 | 2011 | 13 | 13 | 0 |
| Aeshnidae | Aeshna interrupta | 1914 | 2013 | 50 | 53 | 3 |
| Lestidae | Lestes disjunctus | 1912 | 2013 | 62 | 66 | 4 |
| Coenagrionidae | Ischnura gemina* | 1900 | 2013 | 12 | 13 | 1 |
| Gomphidae | Stylurus intricatus | 1915 | 2012 | 6 | 7 | 1 |
| Gomphidae | Erpetogomphus compositus | 1914 | 2013 | 48 | 52 | 4 |
| Lestidae | Lestes unguiculatus | 1914 | 2013 | 10 | 13 | 3 |
| Coenagrionidae | Enallagma basidens | 1974 | 2012 | 1 | 4 | 3 |
| Corduliidae | Cordulia shurtleffii | 1914 | 2013 | 32 | 37 | 5 |
| Coenagrionidae | Argia hinei | 1915 | 2013 | 12 | 16 | 4 |
| Gomphidae | Stylurus plagiatus* | 1965 | 2013 | 4 | 8 | 4 |
| Corduliidae | Epitheca spinigera | 1914 | 2013 | 2 | 6 | 4 |
| Corduliidae | Somatochlora albicincta | 1952 | 2013 | 1 | 5 | 4 |
| Coenagrionidae | Argia moesta | 1938 | 2013 | 17 | 22 | 5 |
| Libellulidae | Orthemis ferruginea | 1935 | 2013 | 16 | 21 | 5 |
| Gomphidae | Ophiogomphus severus* | 1914 | 2013 | 3 | 8 | 5 |
| Gomphidae | Progomphus borealis | 1900 | 2013 | 61 | 70 | 9 |
| Libellulidae | Sympetrum internum* | 1914 | 2013 | 12 | 18 | 6 |
| Coenagrionidae | Argia alberta | 1915 | 2013 | 19 | 26 | 7 |
| Coenagrionidae | Nehalennia irene* | 1973 | 2013 | 1 | 9 | 8 |
| Lestidae | Lestes stultus | 1903 | 2013 | 45 | 56 | 11 |
| Gomphidae | Erpetogomphus lampropeltis | 1915 | 2013 | 10 | 19 | 9 |
| Gomphidae | Ophiogomphus morrisoni* | 1914 | 2013 | 23 | 33 | 10 |
| Libellulidae | Libellula saturata | 1879 | 2013 | 354 | 385 | 31 |
| Libellulidae | Sympetrum madidum* | 1897 | 2013 | 59 | 72 | 13 |
| Corduliidae | Somatochlora semicircularis | 1914 | 2013 | 21 | 32 | 11 |
| Libellulidae | Libellula quadrimaculata | 1914 | 2013 | 80 | 95 | 15 |
| Coenagrionidae | Argia sedula | 1945 | 2013 | 26 | 38 | 12 |
| Coenagrionidae | Zoniagrion exclamationis | 1911 | 2013 | 51 | 65 | 14 |
| Libellulidae | Libellula composita* | 1915 | 2013 | 11 | 23 | 12 |
| Aeshnidae | Aeshna canadensis | 1998 | 2012 | 0 | 12 | 12 |
| Coenagrionidae | Ischnura erratica | 1900 | 2013 | 15 | 29 | 14 |
| Coenagrionidae | Ischnura hastata | 1938 | 2013 | 4 | 18 | 14 |
| Libellulidae | Tramea calverti | 1988 | 2011 | 0 | 14 | 14 |
| Gomphidae | Stylurus olivaceus* | 1914 | 2012 | 5 | 21 | 16 |
| Libellulidae | Macrodiplax balteata | 1947 | 2013 | 2 | 19 | 17 |
| Libellulidae | Leucorrhinia glacialis* | 1914 | 2013 | 15 | 33 | 18 |
| Libellulidae | Sympetrum costiferum* | 1934 | 2013 | 11 | 29 | 18 |
| Aeshnidae | Aeshna palmata* | 1914 | 2013 | 34 | 54 | 20 |
| Gomphidae | Ophiogomphus occidentis* | 1914 | 2013 | 17 | 36 | 19 |
| Libellulidae | Sympetrum vicinum | 1980 | 2012 | 0 | 19 | 19 |
| Calopterygidae | Calopteryx aequabilis | 1951 | 2013 | 7 | 27 | 20 |
| Libellulidae | Brachymesia furcata | 1930 | 2013 | 7 | 28 | 21 |
| Libellulidae | Ladona julia | 1953 | 2013 | 4 | 25 | 21 |
| Libellulidae | Pachydiplax longipennis | 1900 | 2013 | 189 | 222 | 33 |
| Aeshnidae | Aeshna umbrosa | 1915 | 2012 | 16 | 40 | 24 |
| Coenagrionidae | Ischnura ramburii | 1930 | 2013 | 7 | 32 | 25 |
| Libellulidae | Leucorrhinia intacta | 1918 | 2013 | 15 | 44 | 29 |
| Coenagrionidae | Argia agrioides | 1907 | 2013 | 71 | 104 | 33 |
| Libellulidae | Perithemis intensa | 1934 | 2013 | 8 | 38 | 30 |
| Coenagrionidae | Ischnura perparva | 1898 | 2013 | 247 | 292 | 45 |
| Gomphidae | Gomphus kurilis | 1905 | 2013 | 68 | 104 | 36 |
| Corduliidae | Macromia magnifica* | 1900 | 2013 | 27 | 61 | 34 |
| Libellulidae | Pantala flavescens | 1915 | 2013 | 20 | 55 | 35 |
| Coenagrionidae | Argia lugens | 1901 | 2013 | 86 | 126 | 40 |
| Aeshnidae | Anax walsinghami* | 1915 | 2013 | 19 | 56 | 37 |
| Libellulidae | Brechmorhoga mendax | 1901 | 2013 | 31 | 69 | 38 |
| Libellulidae | Tramea onusta | 1907 | 2013 | 31 | 69 | 38 |
| Petaluridae | Tanypteryx hageni* | 1918 | 2013 | 22 | 61 | 39 |
| Libellulidae | Plathemis lydia | 1912 | 2013 | 157 | 208 | 51 |
| Coenagrionidae | Argia emma | 1910 | 2013 | 72 | 119 | 47 |
| Aeshnidae | Rhionaeschna californica | 1897 | 2013 | 92 | 144 | 52 |
| Coenagrionidae | Ischnura cervula | 1902 | 2013 | 317 | 394 | 77 |
| Corduliidae | Epitheca canis | 1914 | 2013 | 16 | 77 | 61 |
| Aeshnidae | Rhionaeschna multicolor | 1898 | 2013 | 257 | 345 | 88 |
| Libellulidae | Libellula pulchella | 1905 | 2013 | 84 | 166 | 82 |
| Libellulidae | Libellula luctuosa | 1929 | 2013 | 54 | 143 | 89 |
| Libellulidae | Libellula forensis | 1900 | 2013 | 85 | 220 | 135 |
| Libellulidae | Tramea lacerata | 1900 | 2013 | 107 | 254 | 147 |
| Aeshnidae | Anax junius | 1900 | 2013 | 196 | 361 | 165 |
| Total number of unique occurrences: | 8642 | 9175 | ||||