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Title Sum-
Institution Dataset ID
     data   graph     files  public Green crab size based predation trials conducted in laboratory mesocosms at Romberg Tiburon
Center, Tiburon, CA in 2015
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv
attribute NC_GLOBAL acquisition_description String We conducted short-term size-based predation (=cannibalism) experiments in
which five smaller green crabs were placed in a laboratory mesocosm with a
large adult green crab.\u00a0Size ratios of large to small crabs were
experimentally varied using adult crabs of three size classes and juvenile
crabs as small as were available representing recent recruits. Adult crabs
were starved for 48 hours prior to the trial.\u00a0Alternate prey in the form
of small clams were also available in the mesocosms.\u00a0Experiments were run
for 24 hours after which are remaining crabs were retrieved and remeasured.
All crabs were collected from Seadrift Lagoon, CA.\u00a0

See Turner et al. (2016)\u00a0Biological Invasions\u00a018: 533-548 for
additional methodological details:
Turner, B.C., de Rivera, C.E., Grosholz, E.D., & Ruiz, G.M. 2016. Assessing
population increase as a possible outcome to management of invasive species.
Biological Invasions, 18(2), pp 533\u2013548.
attribute NC_GLOBAL awards_0_award_nid String 699764
attribute NC_GLOBAL awards_0_award_number String OCE-1514893
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1514893 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String David L. Garrison
attribute NC_GLOBAL awards_0_program_manager_nid String 50534
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Predation Trials
PI: Edwin Grosholz (UC Davis)
Co-PI: Catherine de Rivera & Gregory Ruiz (Portland State University)
Version: 05 June 2017
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2017-06-05T20:10:14Z
attribute NC_GLOBAL date_modified String 2020-01-21T21:49:24Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.701987.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/701987 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL keywords String bco, bco-dmo, biological, chemical, data, dataset, date, dmo, erddap, found, management, notes, number, oceanography, office, origin, point, predator, predator_size, preliminary, prey, prey_found, prey_size_1, prey_size_2, prey_size_3, prey_size_4, prey_size_5, size, tank, tank_number, time, time2, time_point, trial, trial_number, tub, tub_number
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/701987/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/701987 (external link)
attribute NC_GLOBAL param_mapping String {'701987': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/701987/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of California-Davis
attribute NC_GLOBAL people_0_affiliation_acronym String UC Davis
attribute NC_GLOBAL people_0_person_name String Edwin Grosholz
attribute NC_GLOBAL people_0_person_nid String 699768
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String Portland State University
attribute NC_GLOBAL people_1_affiliation_acronym String PSU
attribute NC_GLOBAL people_1_person_name String Catherine de Rivera
attribute NC_GLOBAL people_1_person_nid String 699771
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String Portland State University
attribute NC_GLOBAL people_2_affiliation_acronym String PSU
attribute NC_GLOBAL people_2_person_name String Gregory Ruiz
attribute NC_GLOBAL people_2_person_nid String 471603
attribute NC_GLOBAL people_2_role String Co-Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
attribute NC_GLOBAL people_3_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Shannon Rauch
attribute NC_GLOBAL people_3_person_nid String 51498
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String Invasive_predator_harvest
attribute NC_GLOBAL projects_0_acronym String Invasive_predator_harvest
attribute NC_GLOBAL projects_0_description String The usual expectation is that when populations of plants and animals experience repeated losses to predators or human harvest, they would decline over time. If instead these populations rebound to numbers exceeding their initial levels, this would seem counter-intuitive or even paradoxical. However, for several decades mathematical models of population processes have shown that this unexpected response, formally known as overcompensation, is not only possible, but even expected under some circumstances. In what may be the first example of overcompensation in a marine system, a dramatic increase in a population of the non-native European green crab was recently observed following an intensive removal program. This RAPID project will use field surveys and laboratory experiments to verify that this population explosion results from overcompensation. Data will be fed into population models to understand to what degree populations processes such as cannibalism by adult crabs on juvenile crabs and changes in maturity rate of reproductive females are contributing to or modifying overcompensation. The work will provide important insights into the fundamental population dynamics that can produce overcompensation in both natural and managed populations. Broader Impacts include mentoring graduate trainees and undergraduate interns in the design and execution of field experiments as well as in laboratory culture and feeding experiments. The project will also involve a network of citizen scientists who are involved with restoration activities in this region and results will be posted on the European Green Crab Project website.
This project aims to establish the first example of overcompensation in marine systems. Overcompensation refers to the paradoxical process where reduction of a population due to natural or human causes results in a greater equilibrium population than before the reduction. A population explosion of green crabs has been recently documented in a coastal lagoon and there are strong indications that this may be the result of overcompensation. Accelerated maturation of females, which can accompany and modify the expression of overcompensation has been observed. This RAPID project will collect field data from this unusual recruitment class and conduct targeted mesocosm experiments. These will include population surveys and mark-recapture studies to measure demographic rates across study sites. Laboratory mesocosm studies using this recruitment class will determine size specific mortality. Outcomes will be used in population dynamics models to determine to what degree overcompensation has created this dramatic population increase. The project will seek answers to the following questions: 1) what are the rates of cannibalism by adult green crabs and large juveniles on different sizes of juvenile green crabs, 2) what are the consequences of smaller size at first reproduction for population dynamics and for overcompensation and 3) how quickly will the green crab population return to the levels observed prior to the eradication program five years earlier?
attribute NC_GLOBAL projects_0_end_date String 2016-11
attribute NC_GLOBAL projects_0_geolocation String Europe
attribute NC_GLOBAL projects_0_name String RAPID: A rare opportunity to examine overcompensation resulting from intensive harvest of an introduced predator
attribute NC_GLOBAL projects_0_project_nid String 699765
attribute NC_GLOBAL projects_0_start_date String 2014-12
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String Green crab size based predation trials conducted in laboratory mesocosms at Romberg Tiburon Center, Tiburon, CA in 2015.
attribute NC_GLOBAL title String Green crab size based predation trials conducted in laboratory mesocosms at Romberg Tiburon Center, Tiburon, CA in 2015
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable trial_number   byte  
attribute trial_number _FillValue byte 127
attribute trial_number actual_range byte 2, 10
attribute trial_number bcodmo_name String exp_id
attribute trial_number colorBarMaximum double 100.0
attribute trial_number colorBarMinimum double 0.0
attribute trial_number description String Trial number (2-10)
attribute trial_number long_name String Trial Number
attribute trial_number units String unitless
variable time_point   byte  
attribute time_point _FillValue byte 127
attribute time_point actual_range byte 0, 3
attribute time_point bcodmo_name String time_point
attribute time_point description String Observation points 1-3
attribute time_point long_name String Time Point
attribute time_point units String unitless
variable date   String  
attribute date bcodmo_name String date
attribute date description String Calendar date (yyyy-mm-dd)
attribute date long_name String Date
attribute date nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/ (external link)
attribute date source_name String date
attribute date time_precision String 1970-01-01
attribute date units String unitless
variable tank_number   byte  
attribute tank_number _FillValue byte 127
attribute tank_number actual_range byte 1, 9
attribute tank_number bcodmo_name String tank
attribute tank_number colorBarMaximum double 100.0
attribute tank_number colorBarMinimum double 0.0
attribute tank_number description String Number identifying the tank. There was one tank for each set of one predator and five prey crabs, with three tanks in each of three larger tubs
attribute tank_number long_name String Tank Number
attribute tank_number units String unitless
variable tub_number   String  
attribute tub_number bcodmo_name String tank
attribute tub_number description String Number identifying the tub. There were three tubs each containing three tanks.
attribute tub_number long_name String Tub Number
attribute tub_number units String unitless
variable predator_size   byte  
attribute predator_size _FillValue byte 127
attribute predator_size actual_range byte 7, 82
attribute predator_size bcodmo_name String width
attribute predator_size description String Carapace width of single large crab in millimeters
attribute predator_size long_name String Predator Size
attribute predator_size units String millimeters (mm)
variable origin   String  
attribute origin bcodmo_name String origin
attribute origin description String Collection location of crabs
attribute origin long_name String Origin
attribute origin units String unitless
variable time2   String  
attribute time2 bcodmo_name String time
attribute time2 description String Time of observation for 'time point' in Pacific time (HHMM)
attribute time2 long_name String Time
attribute time2 nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/ (external link)
attribute time2 units String unitless
variable prey_found   byte  
attribute prey_found _FillValue byte 127
attribute prey_found actual_range byte 0, 5
attribute prey_found bcodmo_name String count
attribute prey_found description String Number of prey crabs recorded at time point (NA at time zero because crabs were added then)
attribute prey_found long_name String Prey Found
attribute prey_found units String unitless
variable prey_size_1   byte  
attribute prey_size_1 _FillValue byte 127
attribute prey_size_1 actual_range byte 6, 48
attribute prey_size_1 bcodmo_name String width
attribute prey_size_1 description String Carapace width of prey crab #1
attribute prey_size_1 long_name String Prey Size 1
attribute prey_size_1 units String millimeters (mm)
variable prey_size_2   byte  
attribute prey_size_2 _FillValue byte 127
attribute prey_size_2 actual_range byte 6, 54
attribute prey_size_2 bcodmo_name String width
attribute prey_size_2 description String Carapace width of prey crab #2
attribute prey_size_2 long_name String Prey Size 2
attribute prey_size_2 units String millimeters (mm)
variable prey_size_3   byte  
attribute prey_size_3 _FillValue byte 127
attribute prey_size_3 actual_range byte 6, 49
attribute prey_size_3 bcodmo_name String width
attribute prey_size_3 description String Carapace width of prey crab #3
attribute prey_size_3 long_name String Prey Size 3
attribute prey_size_3 units String millimeters (mm)
variable prey_size_4   byte  
attribute prey_size_4 _FillValue byte 127
attribute prey_size_4 actual_range byte 5, 52
attribute prey_size_4 bcodmo_name String width
attribute prey_size_4 description String Carapace width of prey crab #4
attribute prey_size_4 long_name String Prey Size 4
attribute prey_size_4 units String millimeters (mm)
variable prey_size_5   byte  
attribute prey_size_5 _FillValue byte 127
attribute prey_size_5 actual_range byte 6, 51
attribute prey_size_5 bcodmo_name String width
attribute prey_size_5 description String Carapace width of prey crab #5
attribute prey_size_5 long_name String Prey Size 5
attribute prey_size_5 units String millimeters (mm)
variable notes   String  
attribute notes bcodmo_name String comment
attribute notes description String Additional comments about crabs
attribute notes long_name String Notes
attribute notes units String unitless

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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