Global Warming Might Lead To Birth Of Too Many Male Fish
By Matt J. Weiss, December 27, 2008 @ 02:00 AM (EST)
Source: Indiatimes.com
According to a report in Live Science, some experts believe
that the gender of many fish is determined by temperature, because
temperature-dependent sex determination, or TSD, occurs in many
species.
But, a critical analysis of the fish literature by Natalia Ospina-Alvarez and Francesc Piferrer, both of the Marine Science Institute in Barcelona, Spain, casts doubt on that assertion.
The pair point out that fourteen of the twenty diverse fish genera previously reported as having TSD in fact have sex chromosomes, and that it takes unnatural temperatures found only in the laboratory to masculinize their genetic females.
But, the six genera that do show true TSD, including the Menidia silversides and the Apistogramma cichlids, could see their sex ratios skewed by global warming.
But, a critical analysis of the fish literature by Natalia Ospina-Alvarez and Francesc Piferrer, both of the Marine Science Institute in Barcelona, Spain, casts doubt on that assertion.
The pair point out that fourteen of the twenty diverse fish genera previously reported as having TSD in fact have sex chromosomes, and that it takes unnatural temperatures found only in the laboratory to masculinize their genetic females.
But, the six genera that do show true TSD, including the Menidia silversides and the Apistogramma cichlids, could see their sex ratios skewed by global warming.
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