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Stone County, Arkansas

Information provided for informational purposes only

Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.

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Pesticide Table for Cave Crayfish | About the Cave Crayfish
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Stone County, Arkansas Map

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Cave Crayfish

Table of Pesticide Active Ingredients

Active Ingredient Code *TAR
ACEPHATE
7
--
ATRAZINE
7
-
AZINPHOS-METHYL
7
--
BENOMYL
7
--
CAPTAN
7
--
CARBARYL
60
--
CARBOFURAN
7
--
CHLOROTHALONIL
7
--
CHLORPYRIFOS
7
--
DIAZINON
60
--
DIFLUBENZURON
7
--
DIMETHOATE
7
--
DISULFOTON
7
--
MALATHION
60
--
MANCOZEB
7
--
METHOMYL (granular)
799
1
METHOMYL (non-granular)
7
--
METHYL PARATHION
60
--
MEVINPHOS
7
--
NALED
7
--
OXYFLUORFEN
7
--
PARATHION (ethyl)
60
--
PHOSMET
7
--
PROPACHLOR
7
--
PYRETHRINS
7
--
THIOPHANATE-METHYL
7
--
TRALOMETHRIN
7
--
TRICHLORFON
7
--
TRIFLURALIN
7
--
*TAR = Threshold Application Rate (Pounds of active ingredients per acre per application)
Code Limitations
7 For ground applications do not apply this pesticide withhin 20 yards from the edge of all caverns, sinkholes, and surface waters within the shaded area. For aerial applicationsdo not apply within 100 yards of these sites.
60 Do not apply this pesticide within the shaded area.
799 For ground applications, do not apply this pesticide above the threshold application rate (TAR) indicated within 20 yards from the edge of all caverns, sinkholes and surface waters within the shaded area shown on the map. For aerial applications, do not apply within 100 yards of the areas described above.

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Cave crayfish [Cambarus zophonastes]

The cave crayfish lacks pigment in both the body and the eyes. It has a translucent carapace and a beaklike snout with several spines. The overall body length reaches up to 2.5 inches. This crayfish feeds on organic matter and detritus from cave bottoms and moves slowly because of a slow metabolic rate. Reproduction of this species is also slow as females deposit eggs perhaps only once every five years.

The cave crayfish lives only in cool water caves in the complete absence of light along with colonies of gray bats (Myotis grisescens), a federally Endangered mammal. This bat is the primary source of guano, the organic matter that sustains the entire cave ecosystem with an energy source. When bat populations decline, other cave species dependent on guano also are reduced.

It is believed that the cave crayfish once inhabited caves throughout the Ozarks Mountain cave system. Currently, less than 50 individuals are believed to currently inhabit Hell Creek Cave in Stone County, Arkansas.

The most significant cause of the crayfish decline has been attributed to the decline of gray bat populations. However, groundwater quality within the cave system has deteriorated as runoff from agricultual chemicals in the area has increased. The Arkansas Natural Heritage Commission regulates access to the cave to prevent human disturbance to the cave but cannot control surrounding watersheds that flow into the cave. The cave crayfish would certainly benefit from increased bat populations and controlled introductions of foreign substances into the cave system.

Matthews, J.R. (ed.), The Official World Wildlife Fund Guide to Endangered Species Vol. II, Beacham Publishing Inc, Washington, DC. pp. 1025-1026.

 

 

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