Island Night Lizard (Xantusia riversiana)

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Island Night Lizard (Xantusia riversiana)

Citation:

Xantusiid lizards have low energy, water, and food requirements.

Author(s)
Mautz, W.J. and Nagy, K.A.
Issue
4
Volume
73
Exposure Endpoint Type Endpoint Value Units Sex Life Cycle Stage Sample Size Location Type California Counties Countries
Body Weight - Mean Spring-summer adults: 15.3 [4.7 (95% CI)]; spring-summer juveniles: 4.13 [2.23 (95% CI)]; Autumn-winter adults: 16.3 [3.0 (95% CI)]; Autumn-winter juveniles: 1.50 [0.55 (95% CI)] g NR Both Adults and Juveniles Spring-summer adults: 5; spring-summer juveniles: 4; Autumn-winter adults: 8; Autumn-winter juveniles: 4 Wilson Cove, San
Clemente Island 		Exposure Factor Datasets Los Angeles USA
Metabolic Rate Spring-summer adults: 28.7 [7.2 (95% CI)]; spring-summer juveniles: 13.2 [6.8 (95% CI)]; Autumn-winter adults: 30.3 [4.2 (95% CI)]; Autumn-winter juveniles: 4.80 [2.79 (95% CI)] mL CO2/d NR Both Adults and Juveniles Spring-summer adults: 5; spring-summer juveniles: 4; Autumn-winter adults: 8; Autumn-winter juveniles: 4 Wilson Cove, San
Clemente Island 		Exposure Factor Datasets Los Angeles USA
Water Ingestion Rate Spring-summer adults: 0.117 [0.049 (95% CI)]; spring-summer juveniles: 0.074 [0.059 (95% CI)]; Autumn-winter adults: 0.135 [0.032 (95% CI)]; Autumn-winter juveniles: 0.054 [0.036 (95% CI)] mL/d NR Both Adults and Juveniles Spring-summer adults: 5; spring-summer juveniles: 4; Autumn-winter adults: 8; Autumn-winter juveniles: 4 Wilson Cove, San
Clemente Island 		Exposure Factor Datasets Los Angeles USA
Citation:

Ecology of the island night lizard, Xantusia riversiana, on Santa Barbara Island, California

Author(s)
Fellers, Gary M. and Charles A. Drost
Pages
28-78
Year
Volume
5
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Age-Specific Condition Error
Population Density #/ha Not Reported Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets
Dietary Composition Animals, Araneida (15.4%); Crustacea (Isopoda) (50%); Hemiptera (7.7%); Homoptera (15.4%); Coleoptera (11.5%); Lepidoptera (11.5%); Diptera (11.5%); Hymenoptera (7.7%); Other insecta (23.1%); Other arthropoda (15.4%); Vertebrata (3.8%); Plants, Aizoaceae (3.8%); Chenopodiaceae (15.4%); Solanaceae (7.7%); Asteraceae (3.8%); Other plants (38.5%) % of samples with item in stomach contents % Not Reported Not Reported 26 Santa Barbara Island Exposure Factor Datasets
Body Weight - Mean range of average male and average female weights g Both Male and Female Adult 258 Santa Barbara Island Exposure Factor Datasets non-pregnant
Body Weight - Mean BW = -0.26 + 0.000028(SVL)^3 lizard body weight (BW; g) as an exponential function of snout-vent length (SVL,mm) g Both Male and Female Both Adults and Juveniles 792 Santa Barbara Island Exposure Factor Datasets non-pregnant
Age at Sexual Maturity 2.5 yr Male Adult Not Reported Santa Barbara Island Exposure Factor Datasets 0.2 SE
Age at Sexual Maturity 2.9 yr Female Adult Not Reported Santa Barbara Island Exposure Factor Datasets 0.2 SE
Longevity 13.4 estimated from largest lizard (snout-vent length, 102.5 mm)and known growth rates yr Both Male and Female Adult Not Reported Santa Barbara Island Exposure Factor Datasets
Growth Rate 0.022 increase in snout-vent length (34-40 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 0.8 yr 0.002 SE
Growth Rate 0.046 increase in snout-vent length (40-50 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 1.3 yr 0.003 SE
Growth Rate 0.040 increase in snout-vent length (50-60 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 2.0 yr 0.003 SE
Growth Rate 0.030 increase in snout-vent length (60-70 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 2.9 yr 0.002 SE
Growth Rate 0.018 increase in snout-vent length (70-80 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 4.5 yr 0.002 SE
Growth Rate 0.011 increase in snout-vent length (80-90 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 6.9 yr 0.002 SE
Growth Rate 0.005 increase in snout-vent length (90-100 mm size class) mm/d Not Reported Not Reported Santa Barbara Island Exposure Factor Datasets 12.4 yr 0.004 SE
Home Range 17.2 m2 Both Male and Female Adult 6 Santa Barbara Island Exposure Factor Datasets
Citation:

The number of young of Xantusia

Author(s)
Brattstrom, Bayard H.
Pages
143-144
Year
Volume
7
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size determined by embryo count young/female Female Adult 5 San Clemente Island Exposure Factor Datasets
Clutch or Litter Size determined by embryo count young/female Female Adult 4 San Nicolas Island Exposure Factor Datasets
Citation:

The number of young found in the Island Night lizard

Author(s)
Amrein, Yost U. and Margaret B. Amrein
Pages
180
Year
Volume
1951
Exposure Endpoint Type Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size determined from fetus count young/female Female Adult 2 San Nicolas Island Exposure Factor Datasets
Citation:

The food of the nightlizards, Genus Xantusia

Author(s)
Brattstrom, Bayard H.
Pages
168-172
Year
Issue
3
Volume
1952
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Dietary Composition Lizard skin (17); Unidentified arthropods (2); Spiders (11); Scorpions (2); Centipedes (2); Ticks (1), Isopids (17); Insects unidentified (26); Orthoptera (1); Homoptera (1); Hemiptera (3); Lepidoptera (5); Diptera (3); Coleptera (19); Hymenoptera (25); Plants (44) number of individuals in which a particular item was found in stomach contents # Not Reported Not Reported 91 San Nicolas, Santa Barbara and San Clemente Islands Exposure Factor Datasets
Citation:

Reproduction in the island night lizard, Xantusia riversiana

Author(s)
Goldberg, Stephen R. and Robert L. Bezy
Pages
350-360
Year
Issue
4
Volume
30
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Age-Specific
Body Weight - Mean 1.01 g Not Reported Hatchling 15 San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets at birth
Clutch or Litter Size range of average number of young produced/female at 3 sites young/female Female Adult 2-25 San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets
Age at Sexual Maturity yr Both Male and Female Adult Not Reported San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets
Duration of Incubation or Gestation 14 wks Not Reported Embryo Not Reported San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets
Time of Hatching or Parturition Sept. Not Reported Hatchling Not Reported San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets
Time of Mating/ Laying Mar. - June time of breeding Both Male and Female Adult Not Reported San Clemente, San Nicolas and Santa Barbara Islands Exposure Factor Datasets
Citation:

The metabolism of reclusive lizards, the Xantusiidae

Author(s)
Mautz, William J.
Pages
577-584
Year
Volume
1979
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Lab
Metabolic Rate 0.025 (15C); 0.035 (20C); 0.070 (25C); 0.105 (30C); 0.160 (35C) mean oxygen consumption measured at various temperatures (15-35C) during the photophase of the diel cycle cc O2/g/hr Not Reported Adult 10-29/temp. group Exposure Factor Datasets Laboratory
Metabolic Rate 0.024 (15C); 0.036 (20C); 0.058 (25C); 0.081 (30C); 0.146 (35C) mean oxygen consumption measured at various temperatures (15-35C) during the scotophase of the diel cycle cc O2/g/hr Not Reported Adult 10-29/temp. group Exposure Factor Datasets Laboratory
Citation:

Xantusia riversiana (Cope), Island Night Lizard

Author(s)
Fellers, Gary M. and Charles A. Drost
Pages
1-4
Year
Volume
518
Exposure Endpoint Type Endpoint Value Sex Life Cycle Stage Sample Size Location Type
Clutch or Litter Size review Female Adult Not Reported Exposure Factor Datasets
Citation:

Food habits of the island night lizard, Xantusia riversiana reticulata, from San Clemente Island

Author(s)
Schwenkmeyer, Richard C.
Pages
1-3
Year
Volume
38
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type
Dietary Composition Animal matter (68.8%), includes Arachnids (15.9%); Insects (50.4%); Crustaceans (2.6%); Plant matter (30.9%) % of total content of stomachs % Not Reported Not Reported 18 San Clemente Island Exposure Factor Datasets
Citation:

Ecology and energetics of the island night lizard, Xantusia riversiana, on San Clemente Island, California

Author(s)
Mautz, William J.
Pages
417-428
Publisher
Santa Barbara Museum of Natural History
Year
Exposure Endpoint Type Endpoint Value Endpoint Description Units Sex Life Cycle Stage Sample Size Location Type Age-Specific Error
Population Density 1458 #/ha Both Male and Female Both Adults and Juveniles 120 marked animals San Clemente Island Exposure Factor Datasets 103 SE
Growth Rate 0.05 increase in snout-vent length during 1st yr mm/d Both Male and Female 14 San Clemente Island Exposure Factor Datasets 0-1 yr
Growth Rate 0.03 increase in snout-vent length during 2nd yr mm/d Both Male and Female 12 San Clemente Island Exposure Factor Datasets 1-2 yr
Longevity oldest recorded individual yr Both Male and Female Adult Not Reported San Clemente Island Exposure Factor Datasets
Body Weight - Mean g Both Male and Female Adult Not Reported San Clemente Island Exposure Factor Datasets
Body Weight - Mean g Both Male and Female Neonate Not Reported San Clemente Island Exposure Factor Datasets
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