Dataset: Squidpop Assays 2021

Name: Results from predation assays (squidpops) conducted along rocky reefs of the Western coast of San Cristobal, Galapagos from June to November 2021 to determine fish predation intensity across a spatial and temporal temperature gradient
Published: 2023-04-19
Keywords: fish, predation, temperature, oceans

View Data: Data not available yet

Cite This Dataset

Spatial Extent: N:-0.702778 E:-89.247778 S:-0.929 W:-89.612778

Temporal Extent: 2021-06-29 - 2021-11-15

Project:

The Role of Temperature in Regulating Herbivory and Algal Biomass in Upwelling Systems (Temperature and Herbivory)

Principal Investigator:

John Bruno (University of North Carolina at Chapel Hill, UNC-Chapel Hill)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-04-19

Restricted:

Validated:

Current State:

Data not available

Results from predation assays (squidpops) conducted along rocky reefs of the Western coast of San Cristobal, Galapagos from June to November 2021 to determine fish predation intensity across a spatial and temporal temperature gradient

Abstract:

This dataset contains results from predation assays (squidpops) to determine fish predation intensity across a spatial and temporal gradient of temperature. Assays were conducted between June and November 2021 at six locations of rocky reefs along the Western coast of San Cristobal, the eastern Island of the Galapagos Archipelago.

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Methods & Sampling

The squidpop assays consiste of the deployment of 25 stakes with small pieces of squid on top for one hour by burying the stakes in sand on the edge of the reefs. After one hour, the number of baits eaten is quantified to estimate predation intensity. Trials were done in six localities during the months of July and November. The study sites were rocky reefs along the Western coast of San Cristobal, the eastern Island of the Galapagos Archipelago.

Data Processing Description

BCO-DMO Processing:
- renamed fields to comply with BCO-DMO naming conventions;
- created the ISO 8601 date-time field.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1737071

Deployments

None available yet

Instruments

Squidpop

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: Squidpop

Generic Description:

The squidpop assay is described in detail in Duffy et al., 2015 (doi: 10.1371/journal.pone.0142994).

In summary, the squidpop consists of a standard prey item: a small piece of dried squid mantle tissue, tethered to a fiberglass plant stake with light monofilament fishing line. The squidpop is assembled by first punching a 1.3-centimeter (cm) diameter disc from the squid mantle using a cork borer. A length of monofilament line is threaded through the squid disc and tied to it securely, then the other end of the line is attached to the end of the plant stake with electrical tape, leaving 1-2 cm of line with the squid piece on the end. The short length of the line helps prevent tangling the tethers when squidpops are bundled together.

Squidpops are deployed by pushing the stakes securely into the substratum. The stakes are typically arranged in one or two rows, but the spatial arrangement is of secondary importance to ensuring that the squidpops can be reliably relocated and retrieved at the end of the deployment. Squidpops are assessed for the presence or absence of the squid bait after some period of time.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Year	Year when the assay was conducted Format: %Y	unitless	year
Month	Month when the assay was conducted	unitless	month
Locality	Location where assay was conducted	unitless	site
Code1	Combination of month and locality	unitless	sample
Date	Date of assay Format: %Y-%m-%d	unitless	date
Time	Time when the squidpop were deployed Format: %H:%M	unitless	time
ISO_DateTime	Date and time when the squidpop were deployed in ISO8601 format Format: %Y-%m-%dT%H:%M	unitless	date
Season	Whether the assay was conducted during the cold (May-December) or warm season (January-April)	unitless	season
Habitat	Habitat type (reef, rocky reef, or beach)	unitless	site_descrip
Depth	Depth of deployment	meters (m)	depth
Temperature	Water temperature	degrees Celsius	temp
Squidpop	Number of squidpop deployed	unitless	number
Eaten	Whether the bait was eaten (1) or not (0)	unitless	sample_descrip
Code2	Combination of month, locality, and squidpop number	unitless	sample

Database

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Dataset: Squidpop Assays 2021