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Use Of Stems Of Emergent Plants For Oviposition By The Florida Applesnail, Pomacea Paludosa, And The Implications For Marsh Management, Richard L. Turner
Use Of Stems Of Emergent Plants For Oviposition By The Florida Applesnail, Pomacea Paludosa, And The Implications For Marsh Management, Richard L. Turner
Ocean Engineering and Marine Sciences Faculty Publications
This field study examined the distribution among emergent plant stems of egg clutches deposited by the amphibious Florida applesnail in four types of marsh in east central Florida. Clutch density was highest along the edge of sawgrass marsh and zero in deep marsh. Densities in maidencane and mixed shallow marshes were about one-third the density in sawgrass. In all marsh types, clutches occurred preferentially on plants having broad stems that generally exceeded 6 mm in diameter at water level. Substratum limitation for oviposition increased with the frequency of narrow-stemmed plants, but stem height was rarely limiting. The four marsh types …
Muscular Basis Of Buccal Pressure: Inflation Behavior In The Striped Burrfish Chilomycterus Schoepfi, Peter C. Wainwright, Ralph G. Turingan
Muscular Basis Of Buccal Pressure: Inflation Behavior In The Striped Burrfish Chilomycterus Schoepfi, Peter C. Wainwright, Ralph G. Turingan
Ocean Engineering and Marine Sciences Faculty Publications
We examined the relationship between commonly measured features of cranial muscle activity and the magnitude of sub- and superambient pressure measured inside the buccal cavity of the striped burrfish Chilomycterus schoepfi during inflation behavior. Buccal pressure was recorded simultaneously with electromyographic (EMG) records of activity from three expansive-phase muscles (levator operculi, levator pectoralis and hyohyoideus abductor) and three compressive-phase muscles (adductor mandibulae, protractor hyoideus and protractor pectoralis) in eight individuals. We quantified EMG activity in approximately 30 inflation cycles per fish by measuring the burst duration, rectified integrated area, intensity of activity (area divided by duration) and onset time relative …
Seasonal Dynamics Of Dental Sexual Dimorphism In The Atlantic Stingray Dasyatis Sabina, Stephen M. Kajiura, Timothy C. Tricas
Seasonal Dynamics Of Dental Sexual Dimorphism In The Atlantic Stingray Dasyatis Sabina, Stephen M. Kajiura, Timothy C. Tricas
Ocean Engineering and Marine Sciences Faculty Publications
Cartilaginous fishes continuously replace their teeth throughout their life (polyphyodonty) and often show a sexually dimorphic dentition that was previously thought to be an invariant sex character. Radial vector analysis of tooth shape in the polyphyodontic stingray Dasyatis sabina across a consecutive 24 month period shows a stable molariform morphology for females but a periodic shift in male dentition from a female-like molariform to a recurved cuspidate form during the reproductive season. The grip tenacity of the male dentition is greater for the cuspidate form that occurs during the mating season than for the molariform dentition that occurs during the …