Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa

Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa

13 pages, 8 figures, 3 tables

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Main Authors: Ribes, Marta, Coma, Rafael, Gili, Josep Maria
Format: artículo biblioteca
Published: Inter Research 1998-12
Subjects:Feeding behavior, Mediterranean, Ascidians, Prey capture, Diet,
Online Access:http://hdl.handle.net/10261/184225
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spelling dig-icm-es-10261-1842252020-12-11T08:59:19Z Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa Ribes, Marta Coma, Rafael Gili, Josep Maria Feeding behavior Mediterranean Ascidians Prey capture Diet 13 pages, 8 figures, 3 tables The natural diet and prey capture rate of the temperate ascidian Halocynthia papillosa were studied in the field in a Western Mediterranean population. In situ grazing rates on dissolved organic carbon, detrital particulate organic carbon, procaryotes, pico- and nanoeucaryotes, phytoplankton and ciliates were examined through a year cycle. The natural diet of the species included detrital organic matter, heterotrophic bacteria, Prochlorococcus sp., Synechococcus sp. (cyanobacteria type), protozoa and phytoplankton with a mean size range from 0.6 ± 0.3 (heterotrophic bacteria) to 70 ± 22 μm (pennate diatoms). Specific clearance rates varied seasonally and exhibited a pattern of increase with temperature increase in which temperature explained 55 % of the variance in clearance rate throughout the year. Annual variation in prey concentration did not affect specific clearance rate. Ingestion rate of the species showed a marked seasonal pattern which was different for the 2 main food sources: detrital and live particles. Thus, while the highest ingestion of detrital particles was in spring, the highest values of live particle ingestion occurred during summer and fall. Overall, an H. papillosa specimen of mean size 0.25 g AFDW (ash-free dry weight) was estimated to ingest an annual mean of 1305 ± 496 μg C g AFDW-1 h-1 and 84 ± 16 μg N g AFDW-1 h-1. Carbon from detrital origin accounted for 92 ± 2 % of the total ingested carbon, while ingestion of live carbon accounted for 8 ± 2 %. However, the seasonal variation of ingested nitrogen from live particles explained 91% of the gonadal development variance for the year, suggesting that live particles are likely to be of more significance in the diet of the species than particles from detrital origin. Feeding rates are discussed in relation to seasonal changes in food availability and production of the species (i.e. growth and reproduction). The results suggest that factors other than food availability determine the seasonal dynamics of the species Peer Reviewed 2019-06-17T10:23:07Z 2019-06-17T10:23:07Z 1998-12 2019-06-17T10:23:07Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.3354/meps175201 issn: 0171-8630 e-issn: 1616-1599 Marine Ecology Progress Series 175: 201-213 (1998) http://hdl.handle.net/10261/184225 10.3354/meps175201 Publisher's version https://doi.org/10.3354/meps175201 Sí open Inter Research
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
topic Feeding behavior
Mediterranean
Ascidians
Prey capture
Diet
Feeding behavior
Mediterranean
Ascidians
Prey capture
Diet
spellingShingle Feeding behavior
Mediterranean
Ascidians
Prey capture
Diet
Feeding behavior
Mediterranean
Ascidians
Prey capture
Diet
Ribes, Marta
Coma, Rafael
Gili, Josep Maria
Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
description 13 pages, 8 figures, 3 tables
format artículo
topic_facet Feeding behavior
Mediterranean
Ascidians
Prey capture
Diet
author Ribes, Marta
Coma, Rafael
Gili, Josep Maria
author_facet Ribes, Marta
Coma, Rafael
Gili, Josep Maria
author_sort Ribes, Marta
title Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
title_short Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
title_full Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
title_fullStr Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
title_full_unstemmed Seasonal variation of in situ feeding rates by the temperate ascidian Halocynthia papillosa
title_sort seasonal variation of in situ feeding rates by the temperate ascidian halocynthia papillosa
publisher Inter Research
publishDate 1998-12
url http://hdl.handle.net/10261/184225
work_keys_str_mv AT ribesmarta seasonalvariationofinsitufeedingratesbythetemperateascidianhalocynthiapapillosa
AT comarafael seasonalvariationofinsitufeedingratesbythetemperateascidianhalocynthiapapillosa
AT gilijosepmaria seasonalvariationofinsitufeedingratesbythetemperateascidianhalocynthiapapillosa
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