ABSTRACT

The Flinders Ranges Gudgeon (Mogurnda clivicola) in South Australia, is restricted to permanent spring-fed pools of two creeks in the Northern Flinders Ranges. Consequently, the fish is classified as critically endangered. Regular monitoring of selected water chemistry and fish population characteristics has been conducted since 2018 by a “Friends of Parks” group in an ongoing project contributing to the conservation management for this endangered species. Mogurnda clivicola were abundant and healthy in Weetootla and Nepouie springs, with six or fewer fish displaying any skin lesions on each of the four sampling occasions of May and August 2019 and June and August 2020. Hence the fish populations were not adversely affected by the exceptionally low rainfall years of 2018 and 2019. Fish of less than 2 cm total length were present at each sampling time point, indicating that breeding can occur on an opportunistic basis rather than during a breeding season. Following a substantial flood during February 2020, a substantial breeding event resulted in large numbers of small fish and at Nepouie Spring. For pools that contained fish, the water quality parameters measured and their ranges were: conductivity 1141–13 800 µS/cm; dissolved oxygen concentration 1.9–12.0 mg/L; temperature 11.4–29°C; pH 7.1–8.8; [Ca++] 36–213 mg/L; [NO3-] 0.2–17.7 mg/L.

摘要

南澳大利亚的弗林德斯山脉古金 ( Mogurnda clivicola ) 仅限于弗林德斯山脉北部两条小溪的永久性泉水池。因此，该鱼被列为极度濒危物种。自 2018 年以来，“公园之友”小组在一个正在进行的项目中对选定的水化学和鱼类种群特征进行了定期监测，以促进这一濒危物种的保护管理。无花果在 Weetootla 和 Nepouie spring 中数量丰富且健康，在 2019 年 5 月和 8 月以及 2020 年 6 月和 2020 年 8 月的四次采样中，每一次都有 6 条或更少的鱼表现出任何皮肤损伤。 2018 年和 2019 年。在每个采样时间点都存在总长度小于 2 厘米的鱼，这表明繁殖可以是机会性的，而不是在繁殖季节进行。在 2020 年 2 月发生大洪水之后，大规模繁殖事件导致大量小鱼和内普伊泉。对于有鱼的水池，测量的水质参数及其范围是： 电导率 1141–13 800 µS/cm；溶解氧浓度 1.9–12.0 mg/L；温度 11.4–29°C；pH 值 7.1–8.8；[Ca++] 36–213 毫克/升；