In some areas, increased light pollution from coastal cities has raised the nigh

Question

In some areas, increased light pollution from coastal cities has raised the nighttime light level to 10^-4W/m^2 at 10m depth. what are some possible consequences of this light pollution for rockfish ecology? For questions 1-3, Consider the following graph showing threshold irradiance levels by temperature for four species of rockfish that inhabit shallow waters off the Pacific coast. This indicates the level of light necessary for each fish species to be able to see. A lower threshhold value (more negative value on the log scale) indicates more sensitive vision in low light. The horizontal dotted line shows the irradiance level of moonlight during full moon at 10 m depth: Olive rockfish and kelp rockfish are generally nocturnal, while the other two species are diurnal, therefore these two groups generally do not compete. Rockfish are visual sit-and-wait predators. For these questions, assume that rockfish do not show plastic (developmental) responses nor acclimation responses in threshold irradiance. For these questions, you can ignore the blue vertical lines showing error around the mean values. Remember that light decreases with depth, so species adapted to different light levels area adapted to different depths. O BLUE ROCKFISH BLACK ROCKFISH OLIVE ROCKFISH X KELP ROCKFISH

Explanation / Answer

Light pollution has most adverse effects than the beneficial effects against all the living beings including humans. As rock fish are nocturnal animals and visual sit-and wait predators, increased light intensity during nights may help them to predate better, but the negative effects on migratory animals decreases the avialability of preys. The circadian cycle of nocturnal fish, altered mating behaviour, predator avoidance decreases their population, which also affects their future generation.

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