. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2mm. Figure 1. The shell morphology of Plmclla viruuta (A) and Planor- bella tri\-olvis (B and C). The size bar is 2 mm. Materials and Methods Study site and general methods The snails and crayfish used in this study were collected from Oliver Wildlife Preserve (Norman, Oklahoma). Oliver Wildlife Preserve is a forested area on the South Canadian River floodplain that is inundated periodically by runoff and heavy spring rains. The middle third of the preserve typically remains under water throughout the late winter to early s
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2mm. Figure 1. The shell morphology of Plmclla viruuta (A) and Planor- bella tri\-olvis (B and C). The size bar is 2 mm. Materials and Methods Study site and general methods The snails and crayfish used in this study were collected from Oliver Wildlife Preserve (Norman, Oklahoma). Oliver Wildlife Preserve is a forested area on the South Canadian River floodplain that is inundated periodically by runoff and heavy spring rains. The middle third of the preserve typically remains under water throughout the late winter to early summer months (December to June) and supports large populations of P. virgata. P. trivolvis, and P. simulans (Alexander. 1987). Woody debris in Oliver Wildlife Preserve provide abundant substrata onto which the snails migrate to avoid predators; snails were observed above the waterline throughout the year at Oliver Wildlife Preserve and at other sites (pers. obs.). Laboratory experiments were conducted at night, in darkness, simulating the natural conditions under which crayfish are most active. No substratum was included in these experiments. For the handling time and ingestion probability experiments (Experiment 1). where crayfish and snails were under continuous observation, low inten- sity red light was used to facilitate observations. In the second experiment, low intensity white light was used briefly to record observations. When not used in experi- ments, snails were maintained in 40-80-1 aquaria and fed commercial fish food (TetraMin) and lettuce ad libitum. Crayfish were housed individually in 4-1 plastic containers and fed fish food pellets and lettuce ad libitum. Crayfish were starved for at least 24 h prior to the start of the experiments. Experiment 1: differential vulnerability of Physella and Planorbella This experiment was aimed at examining the ability of P. simulans to handle and ingest different size classes of P. virgata and P. trivolvis. A 10-1 aquarium was
Size: 1362px × 1834px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
