Carol E. Johnston

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Nest association, or the habit of spawning in the nest of another species, is a widespread reproductive strategy among North American fishes, especially minnows. The hosts of nest associates include sunfishes and nest-building minnows. Previous experiments demonstrated that nest associates benefited from the parental care of hosts. The purpose of this study(More)
Detection of aquatic species is imperfect, especially if the species is rare and exhibits spatial and temporal variability. Many fish species require a number of sampling trips before detection is positive. And yet, information on species persistence is critical for effective conservation efforts. New forensic genetic techniques, such as environmental DNA(More)
Fishes that act as nest associates spawn simultaneously with nest-building hosts and then abandon their eggs. The proposed benefit for this behavior is increased brood survivorship, arising from the physical environment provided by the nest or the parental care provided by the host. Field and enclosure experiments indicated that associates benefit from the(More)
Male Codoma ornata produce sounds associated with aggression and spawning activities during the breeding season. Females do not produce sounds. Males most often produced sounds associated with escalated displays of aggression, courtship and the spawning act. C. ornata spawn in crevices, but previously were reported to spawn as egg-clusterers in cavities.(More)
Sound production has not been measured in Cyprinella galactura, the whitetail shiner, although described for other species in the genus. Furthermore, no thorough description of signal structure exists for any species of Cyprinella. In this study, Cyprinella galactura produced sounds during agonistic and courtship interactions associated with the breeding(More)
The Redeye Bass, Micropterus coosae, was described from the Mobile River basin, Chattahoochee, and Savannah rivers in Alabama and Georgia, USA, by Hubbs and Bailey (1940). At that time the authors recognized significant variation in the Black Warrior River population, and noted that with further study this form may be recognized as a separate taxon. An(More)
Signal structure and behavioural context were examined in two sister species, the Tallapoosa shiner Cyprinella gibbsi and the tricolor shiner Cyprinella trichroistia, with two more distantly related species, the Ocmulgee shiner Cyprinella callisema and the whitetail shiner Cyprinella galactura, in order to test the hypothesis that more closely related(More)
A field study examined sound production in the pygmy sculpin Cottus paulus, a threatened species found only in Coldwater Spring (Coosa River drainage), Alabama where the study was conducted. Two distinct call types are made during both courtship and agonistic encounters: a single knock and a knock train. The duration of the knock train significantly differs(More)
Erimyzon oblongus was observed spawning in small ditches in central Illinois in 1986, 1987, and 1988. Males defended territories over beds of gravel or near pits that had been constructed byCampostoma anomalum orSemotilus atromaculatus. Females were located upstream in quiet water and drifted downstream tail first into the territory of a male. After a(More)
Sound production has been recently discovered in several species of Acipenser. Our work has focused on testing for sound production in species of sturgeon in the genus Scaphirhynchus. We discovered that pallid sturgeon Scaphirhynchus albus and shovelnose sturgeon, S. albus produce sounds during the breeding season. These signals may be used as part of(More)