During ENSO events, the waters of the Gulf of California become warmer than usual, which can lead to changes in the distribution and abundance of marine organisms. This can have a negative impact on seabirds, which rely on the Gulf of California for food and habitat. For example, warm-water events can cause the collapse of fish populations, which are a major food source for many seabirds. This can lead to declines in seabird populations and, in some cases, even to the local extinction of seabird species.
In addition to changes in the distribution and abundance of marine organisms, warm-water events can also lead to changes in the physical environment of the Gulf of California. For example, warm-water events can lead to increased sea levels, which can inundate seabird nesting sites and destroy seabird colonies. They can also lead to changes in the circulation patterns of the Gulf of California, which can disrupt the migration routes of seabirds and make it difficult for them to find food.
The overall impact of warm-water events on seabird populations in the Gulf of California is complex and depends on a variety of factors, including the severity and duration of the event, the species of seabird affected, and the availability of alternative food sources and habitats. However, there is evidence that warm-water events can have a significant negative impact on seabird populations and that these events are likely to become more frequent and severe in the future due to climate change.
Here are some specific examples of how warm-water events have impacted seabird populations in the Gulf of California:
* The collapse of the sardine population in the Gulf of California during the 1982-83 ENSO event led to a decline in the population of the Heermann's gull, a seabird that relies on sardines for food. The Heermann's gull population declined by over 90% during this event.
* The 1997-98 ENSO event caused sea levels in the Gulf of California to rise by over 2 feet, which inundated many seabird nesting sites. This led to the loss of thousands of seabird nests and the deaths of many seabird chicks.
* Changes in the circulation patterns of the Gulf of California during the 2015-16 ENSO event disrupted the migration routes of many seabirds. This made it difficult for seabirds to find food and led to declines in the populations of several seabird species.
These are just a few examples of how warm-water events can impact seabird populations in the Gulf of California. The evidence suggests that these events are a major threat to seabirds and that they are likely to become more severe in the future due to climate change.
