HomeNewsBiologyTiger shark migrations altered by local weather change, new research finds

Tiger shark migrations altered by local weather change, new research finds


In a brand new research, Neil Hammerschlag, Ph.D., and colleagues used a number of approaches to judge the results of ocean warming on tiger shark actions within the Western North Atlantic. Over the previous ~40 years, shark distributions have expanded poleward, paralleling rising temperatures. Moreover, satellite monitoring of sharks over the previous decade has revealed their annual migrations have prolonged farther poleward and arrival occasions to northern areas have additionally occurred earlier within the yr throughout extraordinarily heat durations, which has subsequently decreased their protections from fishing. Potential penalties of those climate-driven alterations embrace rising shark vulnerability to fishing, disruption of predator-prey interactions and adjustments in encounter charges with people. Credit: Bianca Rangel

A brand new research led by scientists on the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science revealed that the areas and timing of tiger shark motion within the western North Atlantic Ocean have modified from rising ocean temperatures. These climate-driven adjustments have subsequently shifted tiger shark actions exterior of protected areas, leaving the sharks extra weak to industrial fishing.


The actions of tiger sharks, (Galeocerdo cuvier) the most important cold-blooded apex predator in tropical and warm-temperate seas, are constrained by the necessity to keep in heat waters. While waters off the U.S. northeast shoreline have traditionally been too chilly for tiger sharks, temperatures have warmed considerably in recent times making them appropriate for the .

“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” mentioned Neil Hammerschlag, director of the UM Shark Research and Conservation Program and lead creator of the research. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to .”

Hammerschlag and the analysis crew found these climate-driven adjustments by analyzing 9 years of monitoring information from satellite tagged tiger sharks, mixed with almost forty years of standard tag and recapture info equipped by the National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program and satellite derived sea-surface temperature information.

The research discovered that over the last decade, when have been the warmest on file, for each one-degree Celsius improve in above common, tiger shark migrations prolonged farther poleward by roughly 250 miles (over 400 kilometers) and sharks additionally migrated about 14 days earlier to waters off the U.S. northeastern coast.

The outcomes might have better ecosystem implications. “Given their role as , these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans.” mentioned Hammerschlag.

The research, titled “Ocean warming alters the distributional range, migratory timing, and spatial protections of an apex predator, the shark (Galeocerdo cuvier)” was revealed January 13, 2022 within the journal Global Change Biology.

The research’s authors embrace: Neil Hammerschlag, Laura McDonnell, Mitchell Rider, Ben Kirtman from the UM Rosenstiel School; Garrett Street and Melanie Boudreau from Mississippi State University; Elliott Hazen, Lisa Natanson, Camilla McCandless from NOAA Fisheries; Austin J. Gallagher from Beneath the Waves; and Malin Pinsky from Rutgers University.


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More info:
“Ocean warming alters the distributional range, migratory timing, and spatial protections of an apex predator, the tiger shark (Galeocerdo cuvier)” Global Change Biology (2022). DOI: 10.1111/gcb.16045

Citation:
Tiger shark migrations altered by local weather change, new research finds (2022, January 13)
retrieved 13 January 2022
from https://phys.org/news/2022-01-tiger-shark-migrations-climate.html

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