Dataset: Geange_and_Stier_2010 Charismatic Microfauna Functional Response
Deployment: Osenberg_et_al_Moorea

This dataset is part of a manipulative experiment to investigate how nudibranchs and sea hares alter cyanobaterica production through a trophic cascade.

Principal Investigator:

Shane Geange (Victoria University of Wellington)

Co-Principal Investigator:

Jeffrey Shima (Victoria University of Wellington)

Adrian Stier (University of California-Santa Barbara, UCSB)

Contact:

Shane Geange (Department of Conservation - Wellington, New Zealand)

BCO-DMO Data Manager:

Mathew Biddle (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Cryptic density dependence: the effects of spatial, ontogenetic, and individual variation in reef fish (CDD_in_Reef_Fish)

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset-deployment/726820/data

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Description

This dataset is part of a manipulative experiment to investigate how nudibranchs and sea hares alter cyanobaterica production through a trophic cascade. This particular dataset looks into attack rates and handling time of prey based on prey density. This research was conducted in 2008 at the Gump Biological Research Station, Moorea, French Polynesia. For additional data, please see files listed in Related Datasets.

Related Dataset

Geange_and_Stier_2010 Charismatic Microfauna Functional Response: https://www.bco-dmo.org/dataset/726813 (current page)
Geange_and_Stier_2010 Charismatic Microfauna Sea Hare Size: https://www.bco-dmo.org/dataset/726832
Geange_and_Stier_2010 Charismatic Microfauna Trophic Cascade: https://www.bco-dmo.org/dataset/726851

Methods & Sampling

Dataset acquisition description

All experiments were conducted in plastic containers (190 mm x 190 mm x 90 mm; W x L x H). To allow the exchange of fresh seawater, approx. 80% of the surface area of the lids, and two opposing sides of containers were cut away and covered with 0.5 mm mesh screening. Containers were placed within large (2,670 l) outdoor flow-through seawater tanks (10 containers per tank). In each experiment, sea hares (Stylocheilus striatus), nudibranchs (Gymnodoris ceylonica), and cyanobacteria (Lyngbya spp.) were collected from the field. Prior to experiments, nudibranchs were starved for 3 days, and cyanobacteria were rinsed with filtered seawater, which removed associated flora or fauna.

Nine density treatments (1, 2, 3, 4, 5, 6, 7, 8 or 9 sea hares: mean length 20.0 mm ± 3.8 SD) were randomly assigned to 18 containers (n = 2 per treatment), each containing one adult nudibranch (mean length 36.2 mm ± 5.6 SD). The number of sea hares eaten was recorded after 1 day (24 h).

Data Processing Description

Dataset Processing Description

Although this dataset does not contain any processed/analyzed data, this data was used to calculate both attack rates and handling time as follows. Attack rates and handling time were estimated using a Holling Type II functional response. Because prey organisms were not replaced as they were consumed, attack rate and handling time were estimated using Roger’s ‘random predator equation.’

BCO-DMO Processing:

added conventional header with dataset name, PI name, version date
modified parameter names to conform with BCO-DMO naming conventions
date converted from dd-Mon-yy (eg, 8-May-08) to yyyymmdd (eg. 20080508)

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0242312	NSF Division of Ocean Sciences

Instruments

None available yet

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Date	Date of Experiment (yyyymmdd)	unitless	date
OBS	Name of observers (SWG (Shane Geange) ACS (Adrian Stier)	unitless	person
rep	Experimental run (1 or 2)	unitless	exp_id
bin	Unique container ID	unitless	sample
initial_num	Initial number of sea hares at the start of the experiment in each container	unitless	count
number_eaten	Number of sea hares eaten during the experiment	unitless	count
Notes	Additional notes	unitless	no_bcodmo_term

Database

Contribute Data

Dataset: Geange_and_Stier_2010 Charismatic Microfauna Functional Response
Deployment: Osenberg_et_al_Moorea

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Geange_and_Stier_2010 Charismatic Microfauna Functional ResponseDeployment: Osenberg_et_al_Moorea

Dataset acquisition description

Dataset Processing Description

Dataset: Geange_and_Stier_2010 Charismatic Microfauna Functional Response
Deployment: Osenberg_et_al_Moorea