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Possible Cause 1: There was a decrease in the number of plants or algae.
The algae in the vernal pool doesn’t grow as much so there is less algae in the
pool.
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Possible Cause 2: There was a decrease in the number of prey.
The fairy shrimp that the tiger salamander eats are no longer living in the vernal pool.
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Possible Cause 3: There was a decrease in water quality.
Farmers use substances, like pesticides, to grow crops. When it rains the pesticides flow into the vernal pool.
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Possible Cause 4: There was an increase in human activity.
A new housing development is under construction near the vernal pool.
Possible Cause 5: There was an increase in the number of predators.
There are unpredictably large numbers of garter snakes near the vernal pool and they eat every salamander they can find.
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Causa posible 1: Disminución de plantas o algas
Las algas en la laguna temporal no crecen tanto, por eso hay menos algas en la laguna.
Causa posible 2: Disminución de presas
(lo que come la salamandra tigre)
Los camarones hada que la salamandra tigre come ya no viven en la laguna temporal.
Causa posible 3: Disminución de la calidad del agua
Los granjeros usan sustancias (como pesticidas) para hacer crecer los cultivos. Cuando llueve, las sustancias entran a la laguna temporal.
Causa posible 4: Aumento de actividad humana
Un nuevo complejo de viviendas está bajo construcción cerca de la laguna temporal.
Causa posible 5: Aumento de depredadores
(animales que se comen a la salamandra tigre)
Hay un gran número de culebras rayadas cerca de la laguna temporal que se comen a las salamandras tigre.
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