Chesapeake Bay Introduced Species Database


Ligia exotica

Common name(s):
Sea Roach
Image courtesy of Open Cage, Wiki Commons.



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Environmental Tolerances

 
For Survival
For Reproduction
Minimum
Maximum
Minimum
Maximum
Temperature (ºC)
null null null null
Salinity (‰)
7 55 null null
Oxygen
     
pH
null null    
Salinity Range
meso-eu


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Age and Growth

Male
Female
Minimum Adult Size (mm)
16 21
Typical Adult Size (mm)
23 null
Maximum Adult Size (mm)
38.5 32
Typical Longevity (yrs)
1.3 1.3
Maximum Longevity (yrs)
null null


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Reproduction

Start
Peak
End
Reproductive Season
April --- ---
Typical Number of Young
per Reproductive Event
80
Sexuality Mode(s)
dioecious
Mode(s) of Asexual Reproduction
Fertilization Type(s)
outcross-internal
More than One Reproductive
Event per Year
yes
Reproductive Strategy
iteroparous
Egg/Seed Form
brooded


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Development

Minimum Typical Maximum
Egg/Seed Development Time (days)
null 28 null
Larval/Seed Development Period (days)
null null null
Male Maturation Age (yrs)
1 1  
Female Maturation Age (yrs)
1 1  
Larval/Seed Form  
direct develop


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Locomotion and Abundance in Chesapeake

Locomotion
Abundance
Larvae
NA
Juveniles
mobile, nektonic abundant
Adults
mobile, nektonic abundant


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Habitat Preferences

Larvae
Juvenile
Adult
Primary Horizontal Habitats
marinas and docks; coarse woody debris; rocky marinas and docks; coarse woody debris; rocky
Secondary Horizontal Habitats
Reproductive Horizontal Habitats
n/a n/a marinas and docks; coarse woody debris; rocky
Vertical Habitats
epibenthic; terrestrial epibenthic; terrestrial
Substrate Type
wood; rock wood; rock
Tidal Height Location
high intertidal; supratidal high intertidal; supratidal
Wave Exposure
moderate; low; protected
Water Flow


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Trophic Interactions

Larvae
Juveniles
Adults
Trophic Status
herbivore herbivore
Common Food/Prey Items
diatoms, brown algae, green algae diatoms, brown algae, green algae
Common Competitors
Common Consumers


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Comments

Life History: Environmental Tolerances: Salinity- Tolerances were determined experimentally using animals from a shoreline population inTaiwan (Tsai et al. 1997a). Tsai et al. also found a population along an upland stream, 1 km inland and 20-30 m above sea level. Animals from this population showed similar salinity tolerances to coastal populations, and did not survive prolonged emergence in freshwater (Tsai et al. 1997a). Ligia exotica does not seem to have been reported from nontidal freshwater in other locations.

Age and Growth: Longevity- Ligia exotica in southern Brazil had a mean longevity of 1.1-1.3 years (Lopes-Leitzke et al. 2009). For 3 temperate Ligia spp. (L. dilatata, South Africa; L. oceanica, England; L. pallasi, British Columbia), populations longevty and maturity were also between 1 and 2 years (Carefoot and Taylor 1995).

Reproduction: Reproductive Season- Schultz collected L. exotica at the apparent start of its breeding season in Georgia (Schultz 1977). We have not found data on the duration of breeding or other data on reproduction of Atlantic coast populations. Typical Number of Young per Reproductive Event- The figure given is a mean for shoreline populations in Taiwan (Tsai et al. 1995b).

Development: Maturation Age- We have no data for L. exotica, but we averaged data for 3 temperate Ligia spp. (L. dilatata, South Africa; L. oceanica, England; L. pallasi , British Columbia) (Carefoot and Taylor 1995). Maturation might be more rapid in Chesapeake L. exotica, due to higher summer temperatures than at the above locations.

Locomotion and Abundance: Locomotion - Ligia spp. are basically terrestrial animals of the supertidal and exposed intertidal, but are capable of swimming when immersed by waves (Carefoot and Taylor 1995).
Community Ecology:


This data was last modified on Tuesday, September 20th, 2005.
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