Difference between revisions of "Invasive Species of California"

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(Nutria (Myocastor coypus))
(Nutria (Myocastor coypus))
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===Nutria ''(Myocastor coypus)''===
 
===Nutria ''(Myocastor coypus)''===
Nutria, commonly called ''Copu'', are large rodents typically seen on the East coast as invasives, but they were spotted in Merced, California in 2017 <ref name="nut"> https://en.wikipedia.org/wiki/Coypu</ref>. Nutria can be compared to beavers in that they are semi-aquatic and eat the vegetation in and around water. These large rodents mainly eat grasses and small shrubs that hold wetland soil together. Nutria are [https://en.wikipedia.org/wiki/Ecosystem_engineer ecosystem engineers] known to convert wetlands to open water <ref name="nut"/>. The conversion of wetland habitat to open water not only removes organisms that rely on vegetation to survive, but also destroys habitat for future use. Wetlands are already a shrinking habitat and their conservation is necessary for biodiversity found in these dynamic habitats. Report Nutria sightings to the CDFW immediately.
 
 
[[File:copu.jpg|thumb|200px|Nutria on the bank of a wetland]]
 
[[File:copu.jpg|thumb|200px|Nutria on the bank of a wetland]]
 +
Nutria, commonly called ''Copu'', are large rodents typically seen on the East coast as invasives, but they were spotted in Merced, California in 2017 <ref name="nut"> https://en.wikipedia.org/wiki/Coypu</ref>. Nutria can be compared to beavers in that they are semi-aquatic and eat the vegetation in and around water. These large rodents mainly eat grasses and small shrubs that hold wetland soil together. Nutria are [https://en.wikipedia.org/wiki/Ecosystem_engineer ecosystem engineers] known to convert wetlands to open water <ref name="nut"/>. The conversion of wetland habitat to open water not only removes organisms that rely on vegetation to survive, but also destroys habitat for future use. Wetlands are already a shrinking habitat and their conservation is necessary for biodiversity found in these dynamic habitats. Report Nutria sightings to the CDFW immediately.
  
 
==Insects==
 
==Insects==

Revision as of 11:22, 27 March 2019

Aquatic Invasive Species

Quagga and Zebra Mussels

Invasive quagga and zebra mussels are a major threat to our freshwater ecosystems. They are small, clam-like creatures that reproduce rapidly and deplete nutrients in the water. They jeopardize power and water infrastructures, damage ecosystems and destroy recreation. The first confirmed find of Zebra mussels in California occurred at San Justo Reservoir Jan. 10, 2008. Quagga and zebra mussels continue to spread and have infested 39 water bodies throughout the state. A map of all infested waters can be found here. The mission of the Invasive Species Program is to reduce the negative effects of aquatic invasive species on waterways of California. The California Department of Fish and Wildlife (CDFW) is involved in efforts to prevent the introduction of these species into the state, detect and respond to introductions when they occur, and prevent the spread of invasive species that have become established. Boaters are required to have their watercrafts inspected and cleaned at specific check stations around the state. For information on boating restrictions and inspections please contact the waterbody manager directly. [1]

New Zealand Mudsnails (Potamopyrgus antipodarum)

New Zealand Mudsnails (NZMS) are believed to have been introduced in Idaho, then brought west from shipments of sportfish and their eggs. They are a vigorous endangered species and are becoming increasingly common in California's Central Coast. See more information at Invasive Invertebrates of the Central Coast.

Asian Clam (Corbicula fluminea)

Common across the entire country, the Asian Clam has made its way to California's Central Coast. See Invasive Invertebrates of the Central Coast for more information.

Grass Carp (Ctenopharyngodon idella)

Grass Carp are the staple invasive fish in California [2]. In the 1960s, they were used for aquaculture, but were soon released into natural areas [3]. They have voracious appetites and will readily eat much of the vegetation in lentic water bodies. Grass Carp prefer warmer waters with large volumes of water [3]. When the carp remove vegetation from the water bodies, there is less food for native fish, and the increased water clarity encourages algal blooms which can kill everything in the water [3]. Grass Carp also carry Asian tapeworms, which can harm and kill native fish species [4].

Plants

Iceplant (Carpobrotus edulis)

Iceplant was introduced from Africa to help stabilize soil. It is common in California's Central Coast. See more at Invasive Plants of the Central Coast

English/Common Ivy (Hedera helix)

The Common Ivy is a well-known invasive species, given the invasive rank of "high" from the California Invasive Plant Council. The ivy is known to grow rapidly and take nutrients before other native plants can [5]. The plant causes no major harm to humans (minor dermatitis), but competes with other plants by wrapping around them or growing on them. Saplings and young plants are at a disadvantage especially, because they are denied sunlight as the ivy grows above them [6] . The Common Ivy is a hardy plant with leaves covered in a waxy secretion, making traditional herbicides almost ineffective towards it. Keep all ivy trimmed to prevent its over-spreading.

Spanish Broom (Spartium junceum)

Spanish Broom is a tall, woody shrub that spreads quickly once it colonizes an area. The rapid colonization prevents native flowers and shrubs from growing [7]. Spanish Broom does not provide nutrients for many organisms, as it consists of mostly dead wood when it is mature. Two species of beetle (Bruchidius villosus and Exapion fuscirostre) have the potential to be used as biological controls to keep Spanish Broom numbers down by because they feed on the plant and its seeds.

Barb goatgrass (Aegilops triuncialis)

Barb goatgrass was brought to America from Europe and Asia, and quickly spread in grassy habitats. The grass is known to a noxious weed and is unpalatable to most livestock. Barb goatgrass is able to spread because it is not being eaten by large livestock, and as it spreads, it creates a monoculture and kills all other plant life in its path [8]. The seeds of Barb goatgrass can easily be invade other areas by transportation on cars, people, and other animals [8]. Control measures for the grass include prescribed burns and selective mowing when the grass is still young with no seeds produced. Barb goatgrass, like most grasses, has deep, broad roots; thus, mowing is not always an effective control measure. The only effective control measure is the spraying of glyphosate, a common pesticide. The decrease in Barb goatgrass comes at the price of killing all plant life that is sprayed with glyphosate.

Reptiles

Red-eared Slider (Trachemys scripta elegans)

Red-eared slider turtles (RES) are common pets, named for the red stripes on their head near their ears. They have entered local lentic water bodies by escaping captivity and being released by their owners. RES typically invade large ponds and compete with the native aquatic and semi-aquatic vertebrates. The ability for RES to out-compete natives comes from its large size, making it able to claim nesting and basking spaces. RES carry Salmonella, as most reptiles do, which affects the humans who come into contact with the RES and the water they reside in [9] Native pond turtles are affected by parasites and diseases RES carry, which they have no immunity to[9]. Efforts to stop the sale of RES have been implemented since 1975, but because RES has already hybridized with native turtles, their eradication is becoming increasingly difficult. [9] A healthy RES can reach 20 years of age, making them a chronic threat to freshwater ponds. To help in the eradication of RES, report any sightings to the local Park Services or CDFW [9].

Northern and Southern Watersnakes (Nerodia sipedon and Nerodia fasciata, respectively)

These two snakes are amphibious predators that feed on a variety of animals, including: frogs, salamanders, fish, and rodents [10][11]. Northern watersnakes are primarily aquatic, seldom hunting outside of lentic water bodies [10], while Southern watersnakes hunt aquatic and terrestrial animals [11]. Northern waternsnakes are mostly found in Northern California [10], while Southern watersnakes have been found in the Sacramento, Yolo, and Los Angeles counties [11]. The two snakes cause decreases in native populations of their prey, and are also competition for the California's endangered native giant garder snake. Southern watersnakes are resistant to brackish water and like their northern counterparts, have voracious appetites [10][11].

Birds

Wild turkey (Meleagris gallopavo)

Wild turkeys are common across California, specifically in urbanized areas near vegetation. They were first imported in the 1600s for hunting, and again in the 1990s. Turkeys have been in California for many decades, but recently, they have become a concern for local ecosystems because of their ability to compete with native species. It is still under debate whether a turkey is an invasive species, however. Turkeys are considered charismatic birds and enjoyed by many, but because they are large birds that move as a group, they are able to eat more than the smaller native ground birds [12]. Some ecologists believe that turkeys out-compete local native birds such as the California Quail, but many studies find that this is incorrect. [13] [14] Short-term experiments have shown that quail and turkey share common habitat, but quail prefer to live beside roads, where turkey prefer to live near large trees where they roost at night [12] [13] As adults, turkeys do not have many predators besides humans during the turkey hunting season, but as chicks they are prey for bobcats and other medium predators. Turkeys are generalists and have no preference for food; arguably eating whatever they can swallow. This, along with their increase in populations, may serve as a threat for local ground birds, but is not proven. [13] [12]

Turkeys are common in wooded areas [13] [15] in Marina, located in the California Central Coast (specifically on Inter-Garrison Road), but avoid highly urbanized areas [15] such as the California State University Monterey Bay Campus.

Amphibians

American Bullfrog (Lithobates catesbeianus)

Bullfrogs are large amphibians that will eat whatever they can fit in their mouths and out-compete their native counterparts [16] Bullfrogs have voracious appetites, and eat rodents, bats, and other vertebrates, both terrestrial and aquatic[16]. They were first released into the Western states as a natural pest control, but their numbers quickly increased [16]. These large frogs are also known resistant carriers of the chytrid fungus known to infect and kill many other types of amphibians such as native frogs and salamanders. Shorebirds like herons and cranes will eat bullfrogs if they are in their reach, but the frogs emit a painful screech when trapped or harmed, which usually causes their predator to release them. Some native snake venom is ineffective against the bullfrog, making them essentially a species with no predators. Bullfrogs prefer warm lentic habitats, but will tolerate cold or hot temperatures by hibernating or aestivating until the temperature suits its preferences [16]. Report any bullfrog sightings to a local wildlife agency.

Mammals

Feral Cats and Dogs (Felis catus, Canis lupus familiaris, respectively)

An overpopulation of domestic cats and dogs invariably leads to portions of these populations to become feral and homeless. As domesticated animals, these mammals do not completely lose their ability to hunt and survive without the help of humans. Feral dogs are mainly found very urban areas, where they feed on trash and discarded food, and hunt in packs for bigger prey, such as ungulates and other mammals [3]. Feral cats are more infamous for hunting local songbirds, and because they hunt so frequently, many of the songbird populations decline [17]. These populations have the potential to be endangered and threatened species of birds[17]. Domesticated cats also pose a threat to the local bird populations because of their tendency to hunt for enjoyment and their large population (95 million [18]) [17]. Both feral groups are capable of attacking people when provoked or for no apparent reason[3] Report any dangerous feral cat or dog to the local animal control service.

Nutria (Myocastor coypus)

Nutria on the bank of a wetland

Nutria, commonly called Copu, are large rodents typically seen on the East coast as invasives, but they were spotted in Merced, California in 2017 [19]. Nutria can be compared to beavers in that they are semi-aquatic and eat the vegetation in and around water. These large rodents mainly eat grasses and small shrubs that hold wetland soil together. Nutria are ecosystem engineers known to convert wetlands to open water [19]. The conversion of wetland habitat to open water not only removes organisms that rely on vegetation to survive, but also destroys habitat for future use. Wetlands are already a shrinking habitat and their conservation is necessary for biodiversity found in these dynamic habitats. Report Nutria sightings to the CDFW immediately.

Insects

Asian Longhorned Beetles on a hardwood tree

The Asian Longhorned Beetle (Anoplophora glabripennis)

The Asian Longhorned Beetle (ALB) is a large, black and white beetle in the family Cerambycidae which bores into and feeds on a variety hardwood trees [20]. Like all beetles, they are capable of flight, but they are commonly transported as eggs and larvae in imported firewood, as well as firewood from the East coast. [20] The life cycle of the ALB occurs in the hardwood trees that the mother bores into, eventually killing the tree. Adults are present year-round because larvae can overwinter, causing a staggered release of adults into the environment [20]. ALB are capable of killing entire forests if enough of them are present. [20] The ways to reduce the spread of ALB are to report their presence to local rangers, buy only locally produced firewood, and do not enter ALB quarantined areas of forests. [20] The eggs of ALB can be transferred in many ways, including firewood, lumber, and on people, resulting in their potential widespread distribution. ALB are have not been recognized as invasive species in California, but a graduate student from California State University Monterey Bay saw one in Modoc County, California in July of 2018. All states are at risk of ALB infestation.

Argentine Ant (Linepithema humile)

The Argentine ant is a cosmopolitan invasive species, but is very common in the Central Coast of California because of the Mediterranean climate. See more on Invasive Invertebrates of the Central Coast

Ambrosia Beetles (Curculionidae subfamilies Platypodinae and Scoltyinae)

These beetles are unique subfamilies in that they have a symbiotic relationship with the Ambrosia fungi. The beetles and the fungi feed on the inner walls of the tree bark they infest [21][22]. These beetles mostly infest dead trees, but they have been recorded infesting stressed and healthy trees. Ambrosia beetles and their fungal symbiotic partners infest non-native trees invading native forets [21]. Ambrosia beetles have not been recorded to show any threat to native trees.

References

  1. [1]
  2. https://www.wildlife.ca.gov/conservation/invasives/species
  3. 3.0 3.1 3.2 3.3 3.4 https://www.wildlife.ca.gov/Conservation/Invasives/Species/Grass-Carp
  4. https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2798
  5. https://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=4023
  6. https://www.cal-ipc.org/plants/profile/hedera-helix-profile/
  7. https://www.cal-ipc.org/resources/library/publications/ipcw/report79/
  8. 8.0 8.1 https://en.wikipedia.org/wiki/Aegilops_triuncialis
  9. 9.0 9.1 9.2 9.3 https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=11552
  10. 10.0 10.1 10.2 10.3 https://www.wildlife.ca.gov/Conservation/Invasives/Species/Northern-Watersnake
  11. 11.0 11.1 11.2 11.3 https://www.wildlife.ca.gov/Conservation/Invasives/Species/Southern-Watersnake
  12. 12.0 12.1 12.2 https://blogs.scientificamerican.com/guest-blog/california-s-wild-turkey-troubles/
  13. 13.0 13.1 13.2 13.3 https://dukespace.lib.duke.edu/dspace/bitstream/handle/10161/538/MP_ang6_a_200805.pdf.pdf?sequence=1
  14. https://ag.tennessee.edu/fwf/Documents/CHarper/Do%20wild%20turkeys%20influence%20quail%20or%20grouse%20populations.pdf
  15. 15.0 15.1 https://www.nwtf.org/hunt/wild-turkey-basics/habitat
  16. 16.0 16.1 16.2 16.3 https://www.wildlife.ca.gov/Conservation/Invasives/Species/Bullfrog
  17. 17.0 17.1 17.2 https://abcbirds.org/threat/cats-and-other-invasives/
  18. https://www.statista.com/statistics/198102/cats-in-the-united-states-since-2000/
  19. 19.0 19.1 https://en.wikipedia.org/wiki/Coypu
  20. 20.0 20.1 20.2 20.3 20.4 https://www.aphis.usda.gov/aphis/resources/pests-diseases/asian-longhorned-beetle/About-ALB
  21. 21.0 21.1 https://en.wikipedia.org/wiki/Ambrosia_beetle
  22. https://en.wikipedia.org/wiki/Ambrosia_fungi

Disclaimer

This page may contain student work completed as part of assigned coursework. It may not be accurate. It does not necessarily reflect the opinion or policy of CSUMB, its staff, or students.