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Some organisms begin their life cycle as planktonic eggs and larvae, and transition to nektonic juveniles and adults later on in life, sometimes making distinction difficult when attempting to classify certain plankton-to-nekton species as one or the other. For this reason, some biologists avoid using this term.
Pegea confederata on a 1995 stamp from Azerbaijan. A salp (pl.: salps, also known colloquially as “sea grape”) or salpa (pl.: salpae or salpas [2]) is a barrel-shaped, planktonic tunicate in the family Salpidae.
Historically assumed to be primarily planktonic (free-floating drifters), [12] a nektonic lifestyle is also plausible for many species. [13] Thanks to their flattened shape, these ammonoids accelerate effectively, though their large umbilicus introduces more drag in successive thrusts. [ 11 ]
Meroplankton are a wide variety of aquatic organisms which have both a planktonic stage and at least one other component, such as benthic or nektonic, in their life cycles. [1] Much of the meroplankton consists of larval stages of larger organisms. [ 2 ]
Abraliopsis sp. Lanternfish - Hygophum hygomii Hatchetfish - Argyropelecus aculeatus. Generally, the taxonomy of global existing micronekton is not yet complete due to the paucity of faunal surveys, net avoidance (organisms sensing the approach of the net and swimming out of its path) and escapement (animals escape through the meshes after entering the net), and gear in-adaptability.
Circular dendrogram of feeding behaviours A mosquito drinking blood (hematophagy) from a human (note the droplet of plasma being expelled as a waste) A rosy boa eating a mouse whole A red kangaroo eating grass The robberfly is an insectivore, shown here having grabbed a leaf beetle An American robin eating a worm Hummingbirds primarily drink nectar A krill filter feeding A Myrmicaria brunnea ...
The ecosystem was preserved by rapid mudslides that quickly buried organisms near, or on the seafloor, which helps explain the rarity of nektonic organisms at the site. The shale would have supported unique environments like brine pools that could have also helped to preserve the fossils.
As with the Cambrian Explosion, it is likely that environmental changes drove the diversification of plankton, which permitted an increase in diversity and abundance of plankton-feeding lifeforms, including suspension feeders on the sea floor, and nektonic organisms in the water column. [3]