. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 247 Reference: Bio/. Bull 195: 247-248. (October. 1998) Planktonic Feeding and Evolutionary Significance of the Lobate Body Plan Within the Ctenophora John H. Costello (Biology Department, Providence College, Providence, Rhode Island 02918) and Rebecca Coverdale] Ctenophores are gelatinous marine invertebrates that prey upon zooplankton. The two main ctenophoran orders that affect planktonic communities are the Cydippida and the Lobata. The Cydippida possess two elongate tentacles. In the Lobata, two large lobes surr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 247 Reference: Bio/. Bull 195: 247-248. (October. 1998) Planktonic Feeding and Evolutionary Significance of the Lobate Body Plan Within the Ctenophora John H. Costello (Biology Department, Providence College, Providence, Rhode Island 02918) and Rebecca Coverdale] Ctenophores are gelatinous marine invertebrates that prey upon zooplankton. The two main ctenophoran orders that affect planktonic communities are the Cydippida and the Lobata. The Cydippida possess two elongate tentacles. In the Lobata, two large lobes surround comparatively reduced tentacles, and water is drawn through the inter-lobe space by four flap-like ciliated auricles. Both groups are successful predators and are wide- spread in the world's oceans (1). In coastal regions, members of the genera Bolinopsis (Lobata) and Pleurobrachia (Cydip- pida) may co-occur and often reach high densities simultane- ously. The co-occurrence of Bolinopsis and Pleurobrachia suggests the possibility of dietary overlap and feeding competition be- tween these genera, because both are commonly believed to consume copepods as their primary prey (2, 3). To examine this hypothesis, we recorded the gut contents of individuals from two species, Bolinopsis infundibulum (Lobata) and Pleuro- brachia pileus (Cydippida); the animals were collected simulta- neously on six dates between March and May 1998 from the Woods Hole Oceanographic Institution pier in Woods Hole, Massachusetts. Bolinopsis infundibulum preserved poorly (total disintegration within 24 h in formalin solution), did not tolerate vessel containment well, and often regurgitated prey when held in a container for more than 30 min. As a result, ctenophore gut contents were observed microscopically and re- corded at the sample site within 30 min of hand collection. Gut contents were easily observed in intact animals due to transparency of the body wall. On each sample data, 20-30 individua
Size: 2199px × 1137px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
