Percina aurora és una espècie de peix de la família dels pèrcids i de l'ordre dels perciformes.[4]
És un peix d'aigua dolça, bentopelàgic i de clima tropical.[5]
Es troba a Nord-amèrica: la seua distribució històrica incloïa les conques dels rius Pearl i Pascagoula[6][7][8] a Mississippí[9] i Louisiana,[10] però ara és absent del riu Pearl.[11][5]
Les seues principals amenaces són la degradació del seu hàbitat, les activitats mineres[12][13][14] i agrícoles, la contaminació i la seua escassa distribució geogràfica (al voltant dels 200 km²).[15][16][17]
Percina aurora, the pearl darter is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to the United States, where it is known only from Louisiana and Mississippi, but seems no longer to be present in the Pearl River. Its total area of occupation is under 200 km2 (77 sq mi), it is a rare species and a candidate for federal protection. It is threatened by siltation, pollution, habitat destruction and urbanization, and as a result, the International Union for Conservation of Nature has classified its conservation status as being "endangered".
This fish was described as a species in 1994. It had previously been included in Percina copelandi.[1]
The pearl darter grows up to 57 (female) to 64 (male) millimeters long. It has a black spot at the base of the tail fin. The breeding male has a few dark bands. It is usually mature around one year of age.[2]
This fish is now limited to the Pascagoula River drainage in Louisiana and Mississippi states in the United States. It has apparently been extirpated from the Pearl River.[2] The total range is about 200 square kilometers.[1]
This fish can be found in riffles and shallow, fast-moving river water. Higher river flows in the spring help to disperse the juveniles. Its favored habitat is unknown but its habitat requirements are likely similar to those of P. copelandi. This related species feeds on midges and small crustaceans.[2]
Threats to this species include pollution via runoff of fertilizers, pesticides, oil, and other materials. Sediment and silt degrade the habitat. Hurricane Katrina impacted the local area, washing pollutants and salt water into the river. The release of dioxin into the Pascagoula system has been mitigated, but dioxin embedded in the substrate may be stirred up at times, entering the water. Riverside urbanization may lead to organic wastes being released into the water. Sand and gravel mining occur in the river system and destabilize the substrate. Habitat destruction has led to the species' populations being split and isolated, creating a disjunct distribution. This split makes it more likely that populations will become extirpated.[2]
Percina aurora, the pearl darter is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to the United States, where it is known only from Louisiana and Mississippi, but seems no longer to be present in the Pearl River. Its total area of occupation is under 200 km2 (77 sq mi), it is a rare species and a candidate for federal protection. It is threatened by siltation, pollution, habitat destruction and urbanization, and as a result, the International Union for Conservation of Nature has classified its conservation status as being "endangered".
Percina aurora es una especie de peces de la familia Percidae en el orden de los Perciformes.
Se encuentran en Norteamérica.[1]
Percina aurora is een straalvinnige vissensoort uit de familie van de echte baarzen (Percidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1994 door Suttkus & Thompson.
Bronnen, noten en/of referenties
密西西比小鱸為輻鰭魚綱鱸形目鱸亞目河鱸科的其中一種，被IUCN列為瀕危保育類動物，分布於美國的淡水流域，棲息在中底層水域。
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