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Invasive Species

Invasive species are also referred to as exotic species, non-native species, nonindigenous species, or introduced species. Whatever the name, they comprise plants and animals that have been introduced to an area that is outside their normal habitat range, often originating in foreign countries. They can be introduced to an area either intentionally or unintentionally. Once they are introduced they literally take over and push other species out, sometimes resulting in the complete removal of native species from an area.

Invasive plants can negatively affect soil productivity, limit plant diversity, and reduce the acreage of natural grazing lands. Invasive animals can carry and spread diseases for which native animals have no resistance. Invasive species are better able to compete with native species for food, water, and space. In sum total, invasive species not only disrupt habitats and populations, but they can potentially disrupt the health of an entire ecosystem. The links below are to a catalog of invasive plant and animal species found within the Beaver Creek watershed.


Invasive Animals


                Rana catesbeiana


                Bubulcus ibis
                Molothrus ater
                Passer domesticus


                Apis mellifera scutellata


                Orconectes virilis
                Procambarus clarkii


                Aristichthys nobilis
                Cyprinus carpio
                Hypophthalmichthys molitrix
                Oreochromis mossambicus
                Oncorhynchus mykiss
                Salmo trutta
                Pylodictis oliveris

Invasive Plants & Fungi

Class: Dicotyledoneae

                Hedera helix
                Carduus nutans
                Centaurea biebersteinii
                Centaurea diffusa
                Centaurea melitensis
                Centaurea solstitialis
                Cirsium arvense
                Euryops multifidus
                Onopordum acanthium
                Brassica tournefortii
                Salsola kali tragus
                Lonicera japonica
                Euphorbia esula
                Acacia farnesiana
                Albizia julibrissin
                Coronilla varia
                Wisteria sinensis
                Vinca major
                Erodium cicutarium
                Myriophyllum aquaticum
                Myriophyllum spicatum
                Lythrum salicaria
                Elaeagnus angustifolia
                Schinus terebinthifolius
                Melia azedarach
                Ailanthus altissima
                Verbascum thapsus
                Tamarix ramosissima

Class: Filicopsida

                Salvinia molesta

Class: Monocotyledoneae

                Phoenix canariensis
                Arundo donax
                Bromus rubens
                Bromus tectorum
                Pennisetum ciliare
                Pennisetum setaceum
                Phalaris arundinacea
                Phragmites australis
                Pistia stratiotes
                Schismus barbatus
                Sorghum halepense
                Urochloa maxima
                Egeria densa
                Hydrilla verticillata
                Eichhornia crassipes
                Potamogeton crispus

Class: Basidiomycotina (Fungus)

                Cronartium ribicola

Class:Chytridiomycotina (Fungus)

                Batrachochytrium dendrobatidis
Northern Arizona University         Merriam-Powell Center for Environmental Research         Rocky Mountain Research Station         MAB