Ascidian suspension feeding

Petersen, Jens Kjerulf

doi:10.1016/j.jembe.2006.10.023

Cited by 124 publications

(93 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The mechanism by which introduced species are favored in eutrophic areas is unclear and merits further study. It is probable that increased particulate matter in suspension in the water column is important because when overloaded, the filtration capacity of many species declines (PETERSEN 2007). Thus, perhaps the small pool of introduced species in ports all over the world (including species found here, A. sydneiensis, S. canopus, Microcosmus exasperatus Heller, 1878 and H. pallida) is adapted to these conditions.…”

Section: Discussionmentioning

confidence: 91%

Non indigenous ascidians in port and natural environments in a tropical Brazilian bay

Marins¹,

Novaes²,

Rocha³

et al. 2010

Zoologia (Curitiba, Impr.)

View full text Add to dashboard Cite

Despite limited natural dispersal, some species of ascidians can be transported vast distances via oceanic petroleum platforms, ship hulls and ballast water and therefore may be good indicators of bioinvasion. Usually non indigenous species (NIS) are abundant in harbors. This is caused in part because of the higher propagule delivery rate in these areas. An alternative explanation of why invasion is enhanced in harbor and marinas is that environmental degradation commonly found in these habitats favors the establishment of NIS. Most surveys for introduced species were not comprehensive and targeted mainly ports and marinas. Angra dos Reis is an excellent system that provides an opportunity to compare the potential distribution of introduced and native species of Ascidiacea between port and natural environments. Here, we compared the colonization of experimental subtidal plates placed in harbors and marinas with the colonization of plates placed in nearby natural areas. With 27 taxa (15 identified to species), species richness was greater in port environments (25 versus 8). Six taxa were common to both environments while 19 taxa were exclusively found in ports. Among the identified species in ports, three were introduced, five were cryptogenic and only one was native. Only three species were found exclusively in the natural sites and all were cryptogenic. The presence of introduced species only in the port areas of Angra dos Reis reinforces the need for continued, periodic monitoring in the region for early detection of new, potentially invasive, species as well as for better understanding of abnormal population growth of the already known species. Management to reduce the transfer of exotics to natural habitats must be implemented

show abstract

Section: Discussionmentioning

confidence: 91%

Non indigenous ascidians in port and natural environments in a tropical Brazilian bay

Marins¹,

Novaes²,

Rocha³

et al. 2010

Zoologia (Curitiba, Impr.)

View full text Add to dashboard Cite

show abstract

“…Food capture mechanisms in ascidians ('mucus net trapping') are generally much more effective than mussels' 'cirral trapping' in retaining small (< 4 µm) particles (Petersen 2007). Pyura stolonifera studied by Stuart & Klumpp (1984) unselectively consume 1-6.35 µm particles with 100% efficiency.…”

Section: Resultsmentioning

confidence: 99%

Intraspecific variation in stable isotope signatures indicates no small-scale feeding interference between a horse mussel and an ascidian

Yakovis¹,

Artemieva²,

Fokin³

et al. 2012

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

) clumps on gravel and mussels. Species (M. modiolus or S. rustica), tissue (foot and posterior adductor muscles in M. modiolus) and site (8.1 km apart) factors had strong effects on isotope ratios, whilst the presence of a potential competitor had no effect on SIR in either species. We conclude that the diets of M. modiolus and S. rustica are not affected by co-occurrence and do not overlap much, giving no evidence of competition. Further research should take in account the substantial difference in SIR between the 2 M. modiolus muscular tissues studied: −21.582 ± 0.048 (δ 467: 113-120, 2012 size, likely due to technical limitations of the approach based on direct counting of tagged food particles consumed by each individual.Mar Ecol Prog SerStable isotope ratios of carbon and nitrogen are widely used to indirectly assess the relative contribution of different food sources to the diet of animals (see Boecklen et al. 2011 for review). Isotopic signatures are expressed as δ, the ratio of heavy (e.g. . Based on the measurements of these ratios in potential food sources (which usually include particulate organic matter of different origin or certain prey species for marine benthic consumers), one may apply a mixing model to estimate their contribution to the diet of a particular species (Phillips et al. 2005). Stable isotope composition of consumer tissues does not reflect the most recent diet. Instead, it is affected by feeding patterns of several weeks to few months preceding sampling, depending on the metabolic rate of a particular organism and tissue (Dalerum & Angerbjörn 2005). Accurate mixing models thus require potential food sources sampled in advance according to previously studied metabolic rates.Interspecific differences in 13 C and 15 N signatures have been unhesitatingly interpreted as indicators of feeding segregation between potentially competitive suspension-feeding species (e.g. Dubois et al. 2007). High variation of stable isotope signatures observed among the tissues of a single organism may, however, compromise these conclusions (see Lorrain et al. 2002, Yokoyama & Ishihi 2006, CabanellasReboredo et al. 2009, Deudero et al. 2009, Aya & Kudo 2010 for data on bivalves). In coastal Arctic waters, relatively slow metabolic rates of benthic invertebrates are combined with high seasonal changes in potential food sources for suspensionfeeders due to the presence of ice cover and variation in river discharge. Tissue-specific isotope incorporation models (Boecklen et al. 2011) are not yet developed for most species. Therefore, the evidence of interspecific feeding interference or its absence based on mixing models demands multiple repeated sampling of the potential food sources at least several months prior to sampling the consumers. This may not always be technically possible or logistically feasible due to the ice freezing and melting seasons.Interspecific competition for food alters the diet at least of an inferior competitor in relation to the diet observed in the absence of a superior competit...

show abstract

“…data). The intense feeding on POM by corals has been demonstrated by Anthony (1999), but other coral reef organisms such as gastropods (Kappner et al 2000), bivalves (Monismith et al 1990), sponges (Richter & Wunsch 1999), ascidians (Petersen 2007), and polychaetes (Jordana et al 2000) also filter particles from the water column, thereby reducing organic matter flux to the reef sand patches. As the digestion of the trapped materials by these animals is often incomplete (Coffroth 1984, Kappner et al 2000, Ribak et al 2005, the sedimentary microbial community can benefit from the nearby high macrofauna abundance through a continuous lateral supply of organic matter (e.g.…”

Section: Discussionmentioning

confidence: 99%

Coral sand O2 uptake and pelagic–benthic coupling in a subtropical fringing reef, Aqaba, Red Sea

Wild¹,

Naumann²,

Haas³

et al. 2009

Aquat. Biol.

View full text Add to dashboard Cite

Calcareous sands are major sites for recycling of organic matter in coral reef ecosystems. O 2 uptake and pelagic-benthic coupling were studied in coral sands using benthic chambers and sediment traps during several seasonal expeditions between May 2004 and May 2008 along a fringing reef on the Jordanian Red Sea coast. A total of 12 independent dark chamber experiments were conducted at 2.5 to 16.5 m water depth on the highly permeable calcareous reef sands covering the seafloor at the reef and back-reef lagoon. Sedimentary O 2 uptake ranged from 20 to 39 mmol m -2 d -1and was positively correlated with water depth in the lagoon, but not in the reef, where O 2 uptake was significantly lower. Comparison of sedimentary O 2 uptake rates recorded at the same locations revealed little temporal and seasonal variation, and no significant responses to changes in environmental factors in the water column, such as temperature and concentrations of organic or inorganic nutrients. These results suggest that efficient recycling in the pelagic food web of the nutrientdeprived coral reef limits the supply of degradable organic matter to the reef sediments. Increase of sedimentary O 2 uptake with water depth in the lagoon sands may therefore be a function of lateral transport of labile organic particles produced by reef organisms (e.g. benthic algae and corals) rather than sedimentation of water column production.

show abstract

Ascidian suspension feeding

Cited by 124 publications

References 81 publications

Non indigenous ascidians in port and natural environments in a tropical Brazilian bay

Non indigenous ascidians in port and natural environments in a tropical Brazilian bay

Intraspecific variation in stable isotope signatures indicates no small-scale feeding interference between a horse mussel and an ascidian

Coral sand O2 uptake and pelagic–benthic coupling in a subtropical fringing reef, Aqaba, Red Sea

Contact Info

Product

Resources

About