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Chesapeake Sees Unprecedented Jellyfish Scarcity
In one of the wettest summers on record, as boaters dodge floating debris sent down from the Conowingo Dam, jellyfish have been few and far between. In fact, scientists tell Bay Bulletin that bay nettles, the jellyfish we know best, may be more scarce this year than ever before.

Multiple factors resulting from this summer’s rain are probably contributing to the scarcity of nettles. Salinity in many areas has been below levels that nettles can tolerate, let alone reproduce. The high water flow rates we’ve seen this season have physically washed nettles and ctenophores (comb jellies) out of tributaries and down the Bay. And, says Breitburg, over several decades, rising water temperatures have reached levels that are harmful or even lethal to jellyfish.


 
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Decades of Fertilizer Pollution in California - A pollutant that has leached into California aquifers since farmers first began using synthetic fertilizer continues to accumulate and would not be removed from groundwater even if the state’s agriculture businesses abruptly quit using nitrogen-based materials to boost the productivity of their crops.


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