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{{Short description|Species of rodent}}
{{speciesbox
{{Speciesbox
| name = Stephens' kangaroo rat
| name = Stephens's kangaroo rat
| image = Stephens' kangaroo rat.jpg
| image = Stephens' kangaroo rat.jpg
| status = VU | status_system = IUCN3.1
| status = VU | status_system = IUCN3.1
| status_ref = <ref name=iucn>Roach, N. 2018. Dipodomys stephensi. The IUCN Red List of Threatened Species 2018: e.T6682A22228640. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T6682A22228640.en. Downloaded on 18 December 2018.</ref>
| status_ref = <ref name="iucn status 16 November 2021">{{cite iucn |author=Roach, N. |date=2018 |title=''Dipodomys stephensi'' |volume=2018 |page=e.T6682A22228640 |doi=10.2305/IUCN.UK.2018-2.RLTS.T6682A22228640.en |access-date=16 November 2021}}</ref>
| genus = Dipodomys
| genus = Dipodomys
| species = stephensi
| species = stephensi
Line 10: Line 11:
}}
}}


'''Stephens' kangaroo rat''' (''Dipodomys stephensi'') is a species of [[rodent]] in the family [[Heteromyidae]].<ref name = MSW3>{{MSW3 Heteromyidae | id = 12700125 | pages = 848}}</ref> It is [[endemic]] to the [[Southern California]] region of the [[United States]], primarily in western [[Riverside County, California|Riverside County]].<ref>[http://www.sibr.com/mammals/M108.html SIBR database; Stephens' Kangaroo Rat.] Retrieved October 3, 2009.</ref> The species is named after American zoologist [[Frank Stephens (zoologist)|Frank Stephens]] (1849-1937).<ref name = "Beolens">{{Cite book
'''Stephens's kangaroo rat''' ('''''Dipodomys stephensi''''') is a species of [[rodent]] in the family [[Heteromyidae]].<ref name = MSW3>{{MSW3 Heteromyidae | id = 12700125 | pages = 848}}</ref> It is [[endemic]] to the [[Southern California]] region of the [[United States]], primarily in western [[Riverside County, California|Riverside County]].<ref>[http://www.sibr.com/mammals/M108.html SIBR database; Stephens' Kangaroo Rat.] Retrieved October 3, 2009.</ref> The species is named after American zoologist [[Frank Stephens (naturalist)|Frank Stephens]] (1849–1937).<ref name = "Beolens">{{Cite book
| last = Beolens | first = Bo |author2=Watkins, Michael |author3=Grayson, Michael
| last = Beolens | first = Bo |author2=Watkins, Michael |author3=Grayson, Michael
| title = The Eponym Dictionary of Mammals
| title = The Eponym Dictionary of Mammals
Line 18: Line 19:
| isbn = 978-0801893049| oclc = 270129903}}</ref>
| isbn = 978-0801893049| oclc = 270129903}}</ref>


The natural [[habitat]] of Stephens' kangaroo rat is sparsely vegetated temperate [[grassland]].<ref name=Mamm_sp>Bleich, Vernon C. 1977. "Dipodomys stephensi". Mammalian Species 73:1-3.[http://www.science.smith.edu/msi/pdf/i0076-3519-073-01-0001.pdf]{{dead link|date=December 2018}}</ref> This habitat has been [[habitat loss|destroyed]] or modified for agriculture throughout the species' range; as a result, Stephens' kangaroo rat is listed as an [[endangered species]] by the U.S. Fish and Wildlife Service. It occurs sympatrically with the [[Dipodomys agilis|agile kangaroo rat]], but tends to prefer few shrubs and gravelly soils to the agile's preference for denser shrubs.<ref name=Price>Price, Mary V., William S. Longland, and Ross L. Goldingay. 1991. "Niche Relationships of Dipodomys agilis and D. stephensi: Two Sympatric Kangaroo Rats of Similar Size." American Midland Naturalist 126 (1) (July 1): 172-186. {{doi|10.2307/2426161}}.</ref>
The natural habitat of Stephens's kangaroo rat is sparsely vegetated temperate [[grassland]].<ref name=Mamm_sp>{{cite journal |last=Bleich |first=Vernon C. |year=1977 |title=Dipodomys stephensi |journal=Mammalian Species |issue=73 |pages=1–3 |url=http://www.science.smith.edu/msi/pdf/i0076-3519-073-01-0001.pdf |url-status=dead |archive-url=https://web.archive.org/web/20150924121843/http://www.science.smith.edu/msi/pdf/i0076-3519-073-01-0001.pdf |archive-date=2015-09-24 |doi=10.2307/3504015|jstor=3504015 }}</ref> This habitat has been [[habitat loss|destroyed]] or modified for agriculture throughout the species' range; as a result, Stephens's kangaroo rat is listed as a [[threatened species]]<ref>{{cite web | url=https://www.federalregister.gov/documents/2020/08/19/2020-16719/endangered-and-threatened-wildlife-and-plants-reclassification-of-stephens-kangaroo-rat-from | title=Federal Register :: Request Access }}</ref> by the U.S. Fish and Wildlife Service. It occurs sympatrically with the [[Dipodomys agilis|agile kangaroo rat]], but tends to prefer few shrubs and gravelly soils to the agile's preference for denser shrubs.<ref name=Price>Price, Mary V., William S. Longland, and Ross L. Goldingay. 1991. "Niche Relationships of Dipodomys agilis and D. stephensi: Two Sympatric Kangaroo Rats of Similar Size." American Midland Naturalist 126 (1) (July 1): 172–186. {{doi|10.2307/2426161}}. {{JSTOR|2426161}}.</ref>


== Description ==
== Description ==
This kangaroo rat is part of the Dipodomys genus. It is a medium size for its genus at 277 to 300mm in total length and an average weight of 67.26g. Its tail length is 164 to 180mm, which puts the tail about 1.45 times the length of the body. The color is described as being bicolored with tan to dark brown on the dorsal side and white on the ventral side. The soles of the hind limbs have a dusky color to them, there are a few white hairs on the tufts of the tail, and there are ventral and dorsal white stripes that run along the tail. <ref>Bleich, Vernon C. “Dipodomys Stephensi.” Mammalian Species, no. 73, 1977, p. 1., doi:10.2307/3504015.</ref>
This kangaroo rat is part of the ''[[Dipodomys]]'' genus. Despite the common name, this is unrelated to an Australian kangaroo ([[Macropodidae]]). It is a medium size for its genus at 277 to 300mm in total length and an average weight of 67.26g. Its tail length is 164 to 180mm, which puts the tail about 1.45 times the length of the body. The color is described as being bicolored with tan to dark brown on the dorsal side and white on the ventral side. The soles of the hind limbs have a dusky color to them, there are a few white hairs on the tufts of the tail, and there are ventral and dorsal white stripes that run along the tail.<ref name=Mamm_sp />


== Range and habitat ==
== Range and habitat ==
The Stephens' kangaroo rat was once found in limited regions in southern California,<ref>Brock, Rachel E., and Douglas A. Kelt. “Influence of Roads on the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Are Dirt and Gravel Roads Different?” Biological Conservation, vol. 118, no. 5, 2004, pp. 633–640., doi:10.1016/j.biocon.2003.10.012.</ref> but now due to development leading to habitat loss the populations are now only found in select nature reserves in San Jacinto Valley, San Bernardino, and northwestern San Diego counties in California. <ref>Bleich, Vernon C. “Dipodomys Stephensi.” Mammalian Species, no. 73, 1977, p. 1., doi:10.2307/3504015.</ref> Roads surround all the locations that they live or are found to live. This creates problems if they are paved and used often because of car fatalities. However, the Stephen’s kangaroo rat has been found to inhabit and colonize dirt roadsides. This may be due to the type of habitat they prefer.<ref>Brock, Rachel E., and Douglas A. Kelt. “Influence of Roads on the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Are Dirt and Gravel Roads Different?” Biological Conservation, vol. 118, no. 5, 2004, pp. 633–640., doi:10.1016/j.biocon.2003.10.012.</ref>
Stephens's kangaroo rat was once found in limited regions in southern California,<ref name="Brock et al.">Brock, Rachel E., and Douglas A. Kelt. "Influence of Roads on the Endangered Stephens Kangaroo Rat (''Dipodomys Stephensi''): Are Dirt and Gravel Roads Different?" Biological Conservation, vol. 118, no. 5, 2004, pp. 633–640. {{doi|10.1016/j.biocon.2003.10.012}}.</ref> but now due to development leading to habitat loss the populations are now only found in select nature reserves in San Jacinto Valley, San Bernardino, and northwestern San Diego counties in California.<ref name=Mamm_sp /> Roads surround all the locations that they live or are found to live. This creates problems if they are paved and used often because of car fatalities. However, the Stephens's kangaroo rat has been found to inhabit and colonize dirt roadsides. This may be due to the type of habitat they prefer.<ref name="Brock et al." /> The Stephens's kangaroo rat prefers sparsely vegetated areas, about 15% cover,<ref>Price, Mary V., et al. "Managing Habitat for the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Effects of Shrub Re moval." American Midland Naturalist, vol. 131, no. 1, 1994, p. 9. {{doi|10.2307/2426603}}.</ref> that have annual grasslands with low shrub cover of sagebrush. Further more they like seral stage, intermediate, plant communities that are retained by fires, grazing, and or agriculture. They are also limited to gravely soil that cannot be too dense. This is because they have to burrow into it to make their tunnel systems for nesting and storage.<ref name="Brock et al." />
The Stephens' kangaroo rat prefers sparsely vegetated areas, about 15% cover. <ref>Price, Mary V., et al. “Managing Habitat for the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Effects of Shrub Re moval.” American Midland Naturalist, vol. 131, no. 1, 1994, p. 9., doi:10.2307/2426603.</ref>, that have annual grasslands with low shrub cover of sagebrush. Further more they like seral stage, intermediate, plant communities that are retained by fires, grazing, and or agriculture. They are also limited to gravely soil that cannot be too dense. This is because they have to burrow into it to make their tunnel systems for nesting and storage.<ref>Brock, Rachel E., and Douglas A. Kelt. “Influence of Roads on the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Are Dirt and Gravel Roads Different?” Biological Conservation, vol. 118, no. 5, 2004, pp. 633–640., doi:10.1016/j.biocon.2003.10.012.</ref>


== Food and foraging behavior ==
== Food and foraging behavior ==
With living in sparsely covered habitat and making bare spots in the land the rats create trails. They use these trails to get around easily from food source to food source. These trails lessen some of the dangers of foraging, as they make for a clear path for fast getaways leading straight to their burrow. Even though they move along their cleared trails to go to different food sources and the use to escape terrestrial predators they have to worry about aerial predators. They deal with this by foraging under the remaining shrubs that are left standing for seeds.<ref>O'Farrell, Michael J, and Curt E Uptain. “Distribution and Aspects of the Natural History of Stephen's kangaroo Rat (Dipodomys Stephensi) on the Warner Ranch, San Diego Co., California.” The Wasmann Journal of Biology , vol. 45, Jan. 1987, pp. 38–48.</ref> Seeds are the on the main curse for this kangaroo rat, and that means that they are a granivorous. In doing dissection of kangaroo rat stomachs it was found that their diets composed of red brome (''Bromus rubens''), common Mediterranean grass (''Schismus barbatus''), and red-stemmed filaree (''Erodium cicutarium''). All of these species were introduced to North America. Ants, chewing lice, and darkling beetles were also found in their stomachs but not as prominent as the plant species listed above.<ref>Lowe, Margot. “Diet of Stephens' Kangaroo Rat, Dipodomys Stephensi.” The Southwestern Naturalist, vol. 42, no. 3, 1997, pp. 358–361. JSTOR, JSTOR, www.jstor.org/stable/30055295.</ref>
With living in sparsely covered habitat and making bare spots in the land the rats create trails. They use these trails to get around easily from food source to food source. These trails lessen some of the dangers of foraging, as they make for a clear path for fast getaways leading straight to their burrow. Even though they move along their cleared trails to go to different food sources and the use to escape terrestrial predators they have to worry about aerial predators. They deal with this by foraging under the remaining shrubs that are left standing for seeds.<ref>O'Farrell, Michael J, and Curt E Uptain. "[http://www.mammalogist.org/PDF/reprints/Pub050.pdf Distribution and Aspects of the Natural History of Stephens's kangaroo Rat (''Dipodomys stephensi'') on the Warner Ranch, San Diego Co., California]." The Wasmann Journal of Biology , vol. 45, Jan. 1987, pp. 38–48.</ref> Seeds are the on the main course for this kangaroo rat, and that means that they are a granivorous. In doing dissection of kangaroo rat stomachs it was found that their diets composed of red brome (''Bromus rubens''), common Mediterranean grass (''Schismus barbatus''), and red-stemmed filaree (''Erodium cicutarium''). All of these species were introduced to North America. Ants, chewing lice, and darkling beetles were also found in their stomachs but not as prominent as the plant species listed above.<ref>Lowe, Margot. "Diet of Stephens' Kangaroo Rat, ''Dipodomys stephensi''." The Southwestern Naturalist, vol. 42, no. 3, 1997, pp. 358–361. {{JSTOR|30055295}}.</ref>


== Impacts on their environment ==
== Impacts on their environment ==
Stephens' kangaroo rats have been shown to have a keystone like effect on their sounding environment. One why this is seen is by digging burrows. By digging burrows the soil fertility increases and the water infiltration increase as well. This then leads to larger plant diversity. Seed caching is also another means of how they change their environment. Seed caching is when they burry seeds to hide them so they can come back later for them. They don’t always find them again or eat them and this leads to a greater diversity of plants around their burrow. Erodium, which is an invasive species, is able to outcompete native species. This then diminishes the natural diversity within the habitat. Stephen’s Kangaroo rat is able to help decrease the impact by controlling the impact of the Erodium by keeping the numbers down. These kangaroo rats clear patches of ground, which allows it to keep a seral stage environment. This removal of vegetation also keeps down the number of granivorous rodents down. This then allows for plants to have a greater chance to disperse and reach full development.<ref>Brock, Rachel E., and Douglas A. Kelt. “Keystone Effects of the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi).” Biological Conservation, vol. 116, no. 1, 2004, pp. 131–139., doi:10.1016/s0006-3207(03)00184-8.</ref>
Stephens's kangaroo rats have been shown to have a keystone like effect on their sounding environment. One way this is seen is by digging burrows. By digging burrows the soil fertility increases and the water infiltration increase as well. This then leads to larger plant diversity. Seed caching is also another means of how they change their environment. Seed caching is when they bury seeds to hide them so they can come back later for them. They don't always find them again or eat them and this leads to a greater diversity of plants around their burrow. Erodium, which is an invasive species, is able to outcompete native species. This then diminishes the natural diversity within the habitat. Stephens's kangaroo rat is able to help decrease the impact by controlling the impact of the Erodium by keeping the numbers down. These kangaroo rats clear patches of ground, which allows it to keep a seral stage environment. This removal of vegetation also keeps down the number of granivorous rodents down. This then allows for plants to have a greater chance to disperse and reach full development.<ref>Brock, Rachel E., and Douglas A. Kelt. "Keystone Effects of the Endangered Stephens Kangaroo Rat (''Dipodomys stephensi'')." Biological Conservation, vol. 116, no. 1, 2004, pp. 131–139. {{doi|10.1016/s0006-3207(03)00184-8}}.</ref>


== Population ecology ==
== Population ecology ==
Due to the dispersal and location of the populations of kangaroo rats they have experienced isolation from other populations. In two populations a haplotype, haplotype A, was found, but it was not found in a populations further away. This suggests that there is a decrease of gene flow between the different populations of kangaroo rats. Another haplotype type designates a different story as to the genetics of this species. A haplotype CC is widespread but not in a random fashion. The haplotype CC mostly dominates in the south with very little appearance in the north and central regions. This high frequency of haplotype CC in the south and the lack of different haplotypes unrelated to haplotype CC suggest that there was a population bottleneck that occurred in the south. It seem likely that the population of southern Kangaroo rats now would have repopulated from a small group in the south due to them living in a disconnected valley from the central and northern populations. <ref>Metcalf, Anthony E., et al. “Geographic Patterns Of Genetic Differentiation Within The Restricted Range Of The Endangered Stephens Kangaroo Rat Dipodomys Stephensi.” Evolution, vol. 55, no. 6, 2001, p. 1233., doi:10.1554/0014-3820(2001)055[1233:gpogdw]2.0.co;2.</ref>
Due to the dispersal and location of the populations of kangaroo rats they have experienced isolation from other populations. In two populations a haplotype, haplotype A, was found, but it was not found in a populations further away. This suggests that there is a decrease of gene flow between the different populations of kangaroo rats. Another haplotype type designates a different story as to the genetics of this species. A haplotype CC is widespread but not in a random fashion. The haplotype CC mostly dominates in the south with very little appearance in the north and central regions. This high frequency of haplotype CC in the south and the lack of different haplotypes unrelated to haplotype CC suggest that there was a population bottleneck that occurred in the south. It seem likely that the population of southern Kangaroo rats now would have repopulated from a small group in the south due to them living in a disconnected valley from the central and northern populations.<ref>Metcalf, Anthony E., et al. "Geographic Patterns Of Genetic Differentiation Within The Restricted Range Of The Endangered Stephens Kangaroo Rat ''Dipodomys stephensi''." Evolution, vol. 55, no. 6, 2001, p. 1233. {{doi|10.1554/0014-3820(2001)055[1233:gpogdw]2.0.co;2}}.</ref>


==References==
==References==
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{{Taxonbar|from=Q308213}}
{{Taxonbar|from=Q308213}}
{{Authority control}}


{{DEFAULTSORT:Stephens's kangaroo rat}}
[[Category:Dipodomys|stephensi]]
[[Category:Dipodomys|stephensi]]
[[Category:Endemic fauna of California|kangaroo rat]]
[[Category:Endemic fauna of California]]
[[Category:Mammals of the United States|Dipodomys stephensi]]
[[Category:Endemic rodents of the United States]]
[[Category:Fauna of Riverside County, California]]
[[Category:Fauna of Riverside County, California]]
[[Category:Natural history of the Peninsular Ranges]]
[[Category:Natural history of the Peninsular Ranges]]
[[Category:Endangered fauna of California]]
[[Category:Endangered fauna of California]]
[[Category:Mammals described in 1907]]
[[Category:Mammals described in 1907]]
[[Category:Taxa named by Clinton Hart Merriam]]
[[Category:Taxonomy articles created by Polbot]]
[[Category:Taxonomy articles created by Polbot]]
[[Category:ESA endangered species]]
[[Category:ESA endangered species]]

Latest revision as of 21:58, 10 July 2024

Stephens's kangaroo rat
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Heteromyidae
Genus: Dipodomys
Species:
D. stephensi
Binomial name
Dipodomys stephensi
(Merriam, 1907)

Stephens's kangaroo rat (Dipodomys stephensi) is a species of rodent in the family Heteromyidae.[2] It is endemic to the Southern California region of the United States, primarily in western Riverside County.[3] The species is named after American zoologist Frank Stephens (1849–1937).[4]

The natural habitat of Stephens's kangaroo rat is sparsely vegetated temperate grassland.[5] This habitat has been destroyed or modified for agriculture throughout the species' range; as a result, Stephens's kangaroo rat is listed as a threatened species[6] by the U.S. Fish and Wildlife Service. It occurs sympatrically with the agile kangaroo rat, but tends to prefer few shrubs and gravelly soils to the agile's preference for denser shrubs.[7]

Description

[edit]

This kangaroo rat is part of the Dipodomys genus. Despite the common name, this is unrelated to an Australian kangaroo (Macropodidae). It is a medium size for its genus at 277 to 300mm in total length and an average weight of 67.26g. Its tail length is 164 to 180mm, which puts the tail about 1.45 times the length of the body. The color is described as being bicolored with tan to dark brown on the dorsal side and white on the ventral side. The soles of the hind limbs have a dusky color to them, there are a few white hairs on the tufts of the tail, and there are ventral and dorsal white stripes that run along the tail.[5]

Range and habitat

[edit]

Stephens's kangaroo rat was once found in limited regions in southern California,[8] but now due to development leading to habitat loss the populations are now only found in select nature reserves in San Jacinto Valley, San Bernardino, and northwestern San Diego counties in California.[5] Roads surround all the locations that they live or are found to live. This creates problems if they are paved and used often because of car fatalities. However, the Stephens's kangaroo rat has been found to inhabit and colonize dirt roadsides. This may be due to the type of habitat they prefer.[8] The Stephens's kangaroo rat prefers sparsely vegetated areas, about 15% cover,[9] that have annual grasslands with low shrub cover of sagebrush. Further more they like seral stage, intermediate, plant communities that are retained by fires, grazing, and or agriculture. They are also limited to gravely soil that cannot be too dense. This is because they have to burrow into it to make their tunnel systems for nesting and storage.[8]

Food and foraging behavior

[edit]

With living in sparsely covered habitat and making bare spots in the land the rats create trails. They use these trails to get around easily from food source to food source. These trails lessen some of the dangers of foraging, as they make for a clear path for fast getaways leading straight to their burrow. Even though they move along their cleared trails to go to different food sources and the use to escape terrestrial predators they have to worry about aerial predators. They deal with this by foraging under the remaining shrubs that are left standing for seeds.[10] Seeds are the on the main course for this kangaroo rat, and that means that they are a granivorous. In doing dissection of kangaroo rat stomachs it was found that their diets composed of red brome (Bromus rubens), common Mediterranean grass (Schismus barbatus), and red-stemmed filaree (Erodium cicutarium). All of these species were introduced to North America. Ants, chewing lice, and darkling beetles were also found in their stomachs but not as prominent as the plant species listed above.[11]

Impacts on their environment

[edit]

Stephens's kangaroo rats have been shown to have a keystone like effect on their sounding environment. One way this is seen is by digging burrows. By digging burrows the soil fertility increases and the water infiltration increase as well. This then leads to larger plant diversity. Seed caching is also another means of how they change their environment. Seed caching is when they bury seeds to hide them so they can come back later for them. They don't always find them again or eat them and this leads to a greater diversity of plants around their burrow. Erodium, which is an invasive species, is able to outcompete native species. This then diminishes the natural diversity within the habitat. Stephens's kangaroo rat is able to help decrease the impact by controlling the impact of the Erodium by keeping the numbers down. These kangaroo rats clear patches of ground, which allows it to keep a seral stage environment. This removal of vegetation also keeps down the number of granivorous rodents down. This then allows for plants to have a greater chance to disperse and reach full development.[12]

Population ecology

[edit]

Due to the dispersal and location of the populations of kangaroo rats they have experienced isolation from other populations. In two populations a haplotype, haplotype A, was found, but it was not found in a populations further away. This suggests that there is a decrease of gene flow between the different populations of kangaroo rats. Another haplotype type designates a different story as to the genetics of this species. A haplotype CC is widespread but not in a random fashion. The haplotype CC mostly dominates in the south with very little appearance in the north and central regions. This high frequency of haplotype CC in the south and the lack of different haplotypes unrelated to haplotype CC suggest that there was a population bottleneck that occurred in the south. It seem likely that the population of southern Kangaroo rats now would have repopulated from a small group in the south due to them living in a disconnected valley from the central and northern populations.[13]

References

[edit]
  1. ^ Roach, N. (2018). "Dipodomys stephensi". IUCN Red List of Threatened Species. 2018: e.T6682A22228640. doi:10.2305/IUCN.UK.2018-2.RLTS.T6682A22228640.en. Retrieved 16 November 2021.
  2. ^ Patton, J.L. (2005). "Family Heteromyidae". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 848. ISBN 978-0-8018-8221-0. OCLC 62265494.
  3. ^ SIBR database; Stephens' Kangaroo Rat. Retrieved October 3, 2009.
  4. ^ Beolens, Bo; Watkins, Michael; Grayson, Michael (2009-09-28). The Eponym Dictionary of Mammals. The Johns Hopkins University Press. p. 394. ISBN 978-0801893049. OCLC 270129903.
  5. ^ a b c Bleich, Vernon C. (1977). "Dipodomys stephensi" (PDF). Mammalian Species (73): 1–3. doi:10.2307/3504015. JSTOR 3504015. Archived from the original (PDF) on 2015-09-24.
  6. ^ "Federal Register :: Request Access".
  7. ^ Price, Mary V., William S. Longland, and Ross L. Goldingay. 1991. "Niche Relationships of Dipodomys agilis and D. stephensi: Two Sympatric Kangaroo Rats of Similar Size." American Midland Naturalist 126 (1) (July 1): 172–186. doi:10.2307/2426161. JSTOR 2426161.
  8. ^ a b c Brock, Rachel E., and Douglas A. Kelt. "Influence of Roads on the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Are Dirt and Gravel Roads Different?" Biological Conservation, vol. 118, no. 5, 2004, pp. 633–640. doi:10.1016/j.biocon.2003.10.012.
  9. ^ Price, Mary V., et al. "Managing Habitat for the Endangered Stephens Kangaroo Rat (Dipodomys Stephensi): Effects of Shrub Re moval." American Midland Naturalist, vol. 131, no. 1, 1994, p. 9. doi:10.2307/2426603.
  10. ^ O'Farrell, Michael J, and Curt E Uptain. "Distribution and Aspects of the Natural History of Stephens's kangaroo Rat (Dipodomys stephensi) on the Warner Ranch, San Diego Co., California." The Wasmann Journal of Biology , vol. 45, Jan. 1987, pp. 38–48.
  11. ^ Lowe, Margot. "Diet of Stephens' Kangaroo Rat, Dipodomys stephensi." The Southwestern Naturalist, vol. 42, no. 3, 1997, pp. 358–361. JSTOR 30055295.
  12. ^ Brock, Rachel E., and Douglas A. Kelt. "Keystone Effects of the Endangered Stephens Kangaroo Rat (Dipodomys stephensi)." Biological Conservation, vol. 116, no. 1, 2004, pp. 131–139. doi:10.1016/s0006-3207(03)00184-8.
  13. ^ Metcalf, Anthony E., et al. "Geographic Patterns Of Genetic Differentiation Within The Restricted Range Of The Endangered Stephens Kangaroo Rat Dipodomys stephensi." Evolution, vol. 55, no. 6, 2001, p. 1233. doi:10.1554/0014-3820(2001)055[1233:gpogdw2.0.co;2].
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