Article

 

Not‑so‑simple sieving by ascidians : Re‑examining particle capture at the mesh and organismal scales Public Deposited

Default
https://ir.library.oregonstate.edu/concern/articles/r207tv49m

Descriptions

Attribute NameValues
Alternative Title
Creator
Abstract
  • The particle capture mechanisms of biological filters determine the particle spectrum that is ingested by filter-feeding animals. Although ascidian feeding has been extensively investigated, the organismal-scale fluid dynamics and mesh-scale particle-filter interactions are not fully characterized. Fluorescein dye visualization of flow through the branchial sac of the ascidian Ciona intestinalis showed organismal-scale flow was laminar and moved both parallel and perpendicular to the mucous mesh. Endoscopic investigations of Herdmania momus revealed the mesh-scale filtration process, including the pre-capture velocities, particle approach angles, and mesh behavior. The mesh speed was variable (range 0–0.4 mm s−1). To determine how particle shape affects hydrosol capture, Styela plicata was fed differently shaped polystyrene particles (ellipsoids and spheres); sampling the inhaled and exhaled water revealed that microellipsoids (0.3 × 0.7 μm) were captured at significantly lower efficiency (32%) than 1 μm microspheres (86%). The capture efficiency of microellipsoids resembled that of microspheres with a diameter similar to the microellipsoids’ minor axis (0.3 μm, 31%) suggesting that the minimum diameter of ellipsoidal particles determines the capture efficiency. Flow near the filter was parallel to the mesh even ~ 10 s of micrometers away, implicating a “crossflow” component to ascidian filtration, where the fluid being filtered is directed along the surface of the filter rather than exclusively perpendicular to it. Collectively, these results suggest that ascidian filtration acts as a hybrid-flow filtration system rather than a classical direct sieve.
License
Resource Type
DOI
Date Issued
Citation
Journal Title
Journal Volume
  • 165
Journal Issue/Number
  • 45
Non-Academic Affiliation
Rights Statement
Related Items
Funding Statement (additional comments about funding)
  • The investigation was supported in part by Grants from the US-Israel Binational Science Foundation (Grant #2012089 to K.R.S. and G.Y.), the Alfred P. Sloan Foundation (K.R.S.), Israel Science Foundation 1280/13 to G.Y., a Prof. Rahamimoff Travel Grant for Young Scientists (to K.R.C.), an Oregon Sea Grant 2014 Robert E. Malouf Marine Studies Scholarship (to K.R.C.), and a Julie and Rocky Dixon Graduate Innovation Award (to K.R.C.).
Publisher
Peer Reviewed
Language
Additional Information
  • To access this item from the National Sea Grant Library via interlibrary loan, email a request to nsgl[at]gso.uri.edu. Include article title, author, year published, and ORESU number.
ISSN
  • 1432-1793

Relationships

Parents:
In Collection:

Items