SGCN Abundance

Based on the adjusted NatureServe conservation status ranks, most (167, or 56%) of the 298 vertebrate, mollusc, and crustacean SGCN were considered both state and nationally vulnerable, imperiled, or critically imperiled (Fig. 4-1). Sixty-four (21%) of the SGCN were critically imperiled both nationally and in New Mexico. None of the vertebrate, molluscs, and crustacean SGCN were considered secure or apparently secure in New Mexico, but nationally vulnerable.

Eighty-eight (30%) of our SGCN are nationally secure or apparently secure, but are state vulnerable, imperiled, critically imperiled, or possibility extirpated. These species are fairly evenly distributed among birds, mammals, reptiles, molluscs, and crustaceans (Fig. 4-1). There are 43 species that are considered apparently secure or secure at both the state and national levels. Species in this group include blue catfish (Ictalurus furcatus), mourning dove (Zenaida macroura), hooded oriole (Icterus cucullatus), Abert's Squirrel (Sciurus aberti), black bear (Ursus americanus amblyceps), tiger salamander (Ambystoma tigrinum), collared lizard (Crotaphytus collaris), western glass snail (Vitrina pellucida alaskana), and the Whitewashed Radabotus Snail (Radbotus dealbatus neomexicanus).

A majority of the fish (94%), mammal (57%), amphibian and reptile (58%), and mollusc and crustacean (57%) SGCN are considered both state and nationally vulnerable, imperiled, or critically imperiled (Fig. 4-1). Conversely, only 34% of the birds are both state and nationally vulnerable, imperiled, or critically imperiled. Most (52%) of the bird SGCN are nationally secure, but state vulnerable, imperiled, or critically imperiled.

Figure 4-1

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Figure 4-1. The amount and percent of vertebrate, mollusc, and crustacean Species of Greatest Conservation Need for each taxa group within conservation status groups. Codes to color and large numbers are given in table below pie graphs.