As the world migrates to warmer climates and regions, species that may try to keep themselves at a comfortable temperature may change their range. Although the oceans generally warm at a slower rate than the land, the migration of marine species is already documented. For organisms like fish, mobile adults can dynamically track the right conditions. But many coastal critics revolve primarily in their wandering youth – as larvae (mostly) passively ride currents. Changing your target is not so easy when you are not in the driver’s seat.
Unfortunately, some of these species have been seen migrating Wrong way, Instead of staying away from it, towards high temperature water. We have seen this in the Northwest Atlantic, including coastal commercially cut species. Something unusual is essential to seeing these species shift, as it suits their current-exciting lifestyle. So what does it offer?
A team led by Heidi Fuchs at Rutgers University wanted to test the hypothesis that earlier spring warmth could explain things. These organisms take their spawning cue from warmer temperatures, so long-term temperatures can precede the spring time cue. If the currents are different in early spring, it may cause the larvae to move to new locations as they are ahead of schedule.
To see this activity, researchers used species location data dating back to the 1950s for seafloor invertebrates between North Carolina and Nova Scotia. most of The species migrated their range a few kilometers per year to the south towards the coast Also Moving upside down to shallow water. About two-thirds of the species have seen an increase in the average temperature of their range. Seriously, their range heats up faster than water, because they have migrated incorrectly.
Trends are more meaningful if you estimate the time of spawning each year. The researchers calculated the time that the water rose above the temperature threshold for flowing behavior, and found that each year typically exceeds a few days per year. And a comparison of these sliding dates with currents shows that the larvae should move further if they grow first. In this region, spring winds drive strong currents south along the coast. At the same time, more flow from rivers discharging freshwater into the ocean Also Increase that southward flow.
Some of these species have reacted slightly differently because their sporadic behavior is less sensitive to temperature. Researchers have noted that clams, edible fish and mussels, for example, breed at very low temperatures and incorrectly fit the transfer profile very clearly. But the scalp comes in a wide temperature range and has not migrated much.
Because these species are migrating incorrectly, their range is effectively shrinking. It’s like getting trapped on a conveyor belt that is pushing you towards imminent danger.
It all depends on the trends and trends of certain places, so it will not have the same effect everywhere. But in at least some places, climate change may make it necessary for both species to migrate And Stop doing that.
Nature’s Climate Change, 2020. DOI: 10.1038 / s41558-020-0894-x (About DOI).
