Sterna antillarum
Least Tern (Sterna antillarum)
| Exposure Endpoint Type | Chemical | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|---|
| DDE (4,4'-), POLYCHLORINATED BIPHENYLS | 7% decrease | eggshell thickness compared with pre-1947 reference eggs | Female | Adult | 20 eggs | Cape Romain National Wildlife Refuge | Toxicity Factor Datasets | ||
| Clutch or Litter Size | 1.73 | mean clutch size | eggs/clutch | Female | Adult | 396 clutches | Cape Romain National Wildlife Refuge | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|
| Time of Molt | May-Jul | timing of primary molt | Not Reported | Adult | 190 birds | coastal areas | Exposure Factor Datasets |
| Time of Molt | mid/late Jul-Sep | timing of pre-basic molt | Not Reported | Adult | Not Reported | coastal areas | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type | Error |
|---|---|---|---|---|---|---|---|---|---|
| Fledging or Weaning Rate | 76.8 | estimated survival rate of banded juveniles | % | Not Reported | Fledgling | Not Reported | Aransas and San Patricio Counties | Exposure Factor Datasets | 2.0 2SE |
| Fledging or Weaning Rate | estimated fledgling production among 4 colonies | fledglings/breeding pairs | Not Reported | Fledgling | 26-140 pairs/colony | Aransas and San Patricio Counties | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|
| Hatching Success | 0.79-1.31 | mean hatching success during two years of study | eggs hatched/nest | Not Reported | Chick | 545-606 nests per study year | Sandy Point, West Haven | Exposure Factor Datasets |
| Exposure Endpoint Type | Endpoint Value | Endpoint Description | Units | Sex | Life Cycle Stage | Sample Size | Location | Type |
|---|---|---|---|---|---|---|---|---|
| Time of Nesting | June 16, June 30, July 1 | mean nest-initiation dates over 3 years of study | Both Male and Female | Adult | 6-17 nests/study year | Yellowstone River | Exposure Factor Datasets | |
| Clutch or Litter Size | 2.1-2.7 | range of clutch means over 3 years of study | eggs/clutch | Female | Adult | 6-18 clutches/study year | Yellowstone River | Exposure Factor Datasets |
| Fledging or Weaning Rate | 0.1-1.4 | range of mean fledging success over 3 study years | fledglings/nest | Not Reported | Juvenile | 6-18 nests/study year | Yellowstone River | Exposure Factor Datasets |
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