http://lod.bco-dmo.org/id/dataset/1000468
eng; USA
utf8
dataset
Highest level of data collection, from a common set of sensors or instrumentation, usually within the same research project
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
2026-06-05
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
ISO 19115-2:2009(E)
Owl limpet growth rates and density in Northern and Central California collected from eight intertidal sites from May 2023 to Nov 2024
2026-06-09
publication
2026-06-09
revision
BCO-DMO Linked Data URI
2026-06-09
creation
http://lod.bco-dmo.org/id/dataset/1000468
Rachael Bay
University of California-Davis
principalInvestigator
Eric Sanford
University of California-Davis
principalInvestigator
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
publisher
Cite this dataset as: Walkes, S., Bay, R., Sanford, E. (2026) Owl limpet growth rates and density in Northern and Central California collected from eight intertidal sites from May 2023 to Nov 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-06-09 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/1000468 [access date]
Owl limpet growth rates and density 2023-2024 Dataset Description: Methods and Sampling: <p>This dataset represents a subset of a longer-term monitoring effort of tagged Lottia gigantea individuals conducted across California intertidal sites. The dataset includes annual measurements collected between 2023 and 2024 and associated survey-derived habitat and grazer community metrics. The related dataset (found in the Related Dataset section) contains growth measurements from earlier survey years, but does not include community sampling data.</p>
<p><em>Variation in biotic communities</em>:</p>
<p>We surveyed <em>L. gigantea </em>habitats to test whether the biotic environment differed among the four range core sites and four expanding edge sites, and whether variation in <em>L. gigantea </em>performance was associated with the biotic environment. We considered Dillon Beach, Bodega Marine Reserve, Fort Ross, and Kruse Ranch to be in the expanded range (Sanford et al., 2019), and Vandenberg, Seal Beach, Soberanes Point, and Hopkins Marine Station to be in the range core. Given that <em>L. gigantea </em>have a patchy distribution (Fenberg &amp; Rivadeneira, 2011), we haphazardly established 50-100 1m<sup>2 </sup>plots with limpets present at each site, across approximately 300 m of intertidal habitat. Each plot was marked with marine epoxy (Zspar splash zone compound) in its center. Within each plot, we tagged a single focal <em>L. gigantea </em>using a small (&lt; 6 mm) Floy Tag fixed to the anterior end of the shell using a small dab of marine epoxy (Zspar splash zone compound). For each tagged focal limpet, we recorded growth rate using calipers to relate performance to variation in environmental factors.</p>
<p>For each plot in summer 2023, we sampled the community of competing species within the territories of the focal limpet from 8 sites. Owl limpets are sympatric with several other intertidal grazing species across their range, including limpets (<em>L. scabra, L. digitalis, L. pelta</em>), chitons (<em>Nutallina </em>spp.), and snails (<em>Tegula funebralis</em>) (Stimson, 1973). <em>L. gigantea </em>territories are clearly recognizable as darker areas on the substrate (Fenberg, 2013), so we counted all individuals of the above mentioned grazing species within the territories of the tagged focal limpets and measured the territory area on imageJ to record density (Schneider et al., 2012). In cases which the territory boundary was uncertain, or territories overlapped, we counted all individuals within a 0.25 m<sup>2</sup> quadrat, placed with the focal owl limpet at its center. We did not count grazers &lt; 5 mm as <em>Lottia </em>congeners are often indistinguishable at that size, cryptic, and difficult to count accurately.</p>
<p><em>Quantifying performance:</em></p>
<p>To quantify performance across the range in response to biotic drivers, we recorded organismal growth rate as a function of the environmental data collected within each 1m<sup>2</sup> plot. In <em>L. gigantea </em>growth rate is a strong metric for performance and fitness, as shell length scales with gonad mass (Kido &amp; Murray, 2003). We measured shell length for all tagged limpets from the anterior to posterior end of the shell using calipers. Each focal limpet was measured annually between 2021 and 2023 (see Related Dataset for additional data), and because limpet starting size differed, we calculated relative growth rate (RGR) as ln(SL<sub>Final</sub>/SL<sub>Initial</sub>/Δt), where SL is shell length and t is time (Paine et al., 2012).&nbsp;</p>
Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-2023297 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=2023297
onGoing
Rachael Bay
University of California-Davis
530-754-1439
Dept of Evolution and Ecology University of California
Davis
CA
95616
US
rbay@ucdavis.edu
pointOfContact
Eric Sanford
University of California-Davis
P.O. Box 247 2099 Westshore Road
Bodega Bay
CA
94923
USA
edsanford@ucdavis.edu
pointOfContact
asNeeded
Dataset Version: 1
Unknown
Plot
Territory_Area
L_scabra
L_scabra_density
L_digitalis
L_digitalis_density
L_pelta
L_pelta_density
Nuttallina_density
Nuttallina_sp
Tegula_funebralis
Tegula_funebralis_density
Total_grazers
Total_grazers_density
Length_initial
Width_initial
Site
Date_initial
Length_final
Width_final
Date_final
dt
RGR
Latitude
Longitude
calipers
Olympus Touch
Floy Tag
theme
None, User defined
site
area_measured
abundance
length
width
date
days
rate_measurements
latitude
longitude
featureType
BCO-DMO Standard Parameters
calipers
Camera
labeling tag
instrument
BCO-DMO Standard Instruments
otherRestrictions
otherRestrictions
Access Constraints: none. Use Constraints: Please follow guidelines at: http://www.bco-dmo.org/terms-use Distribution liability: Under no circumstances shall BCO-DMO be liable for any direct, incidental, special, consequential, indirect, or punitive damages that result from the use of, or the inability to use, the materials in this data submission. If you are dissatisfied with any materials in this data submission your sole and exclusive remedy is to discontinue use.
Evolutionary and ecological dynamics of a contemporary climate-driven range expansion
https://osprey.bco-dmo.org/project/867543
Evolutionary and ecological dynamics of a contemporary climate-driven range expansion
<p><em>NSF abstract:</em><br />
Anthropogenic climate change is shifting the distributions of species across the globe. Such contemporary shifts in species’ ranges may have cascading effects on entire ecosystems. This project disentangles the mechanisms underlying climate-driven species range shifts in marine systems using the intertidal owl limpet as a case study. During the recent marine heatwaves off the Pacific coast of North America, populations at the northern range limit in northern California have expanded, with ongoing reproduction even after termination of the heatwave events. This is therefore an ideal system to explore the dynamics of natural selection that occur as species occupy new regions. Broadly, this project deepens understanding of how range shifts occur in marine systems and furthers the ability to predict future species distributions in response to climate change. The project provides research experiences for high school and undergraduate students from historically underrepresented groups by engaging with existing, demonstrably-effective programs. The investigators host leadership and skill-building workshops for senior female graduate students and engage the public in partnership with the California Academy of Sciences, Bodega Marine Lab, and San Francisco Exploratorium. Finally, the project provides training for a postdoctoral scholar and two graduate students.</p>
<p>Although phenomenological studies suggest that climate-associated range shifts are common in marine systems, to date, mechanistic studies of the climate-organism interactions that alter geographic distributions have largely focused on terrestrial systems. However, dispersal dynamics greatly differ in many marine systems, as currents may frequently transport planktonic larvae into new environmental regimes. This project integrates detailed demographic observations of the recent range expansion of the intertidal owl limpet, Lottia gigantea, with ecological, phenotypic, and genomic measurements of divergence across its range. Specifically, the work 1) documents phenotypic divergence in larval and juvenile traits across the zone of range expansion, 2) uses whole genome sequencing to estimate gene flow across the entire range, 3) identifies genomic patterns of selection across the zone of range expansion and through time, and 4) identifies drivers of variation in performance over latitudinal and microgeographic scales. The ability to monitor this range shift in real time, along with the suitability of this system for tracking individuals across multiple years, allows the investigators to examine the impact of selection in novel range-edge conditions at the phenotypic and genomic levels, and scale from individuals to species-level responses to ongoing environmental change.</p>
<p>This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.</p>
LottiaRangeExp
largerWorkCitation
project
eng; USA
biota
oceans
-129.6264
-120.5201
34.7357
38.6042
2023-05-08
2024-11-02
Coastal California intertidal
0
BCO-DMO catalogue of parameters from Owl limpet growth rates and density in Northern and Central California collected from eight intertidal sites from May 2023 to Nov 2024
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
http://lod.bco-dmo.org/id/dataset-parameter/1000642.rdf
Name: Plot
Units: unitless
Description: <p>Unique identifier for each 1 m2 plot in which microenvironmental data and focal limpet growth were recorded</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000643.rdf
Name: Territory_Area
Units: Square centimeters (cm^2)
Description: <p>Area of owl limpet territory</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000644.rdf
Name: L_scabra
Units: unitless
Description: <p>Count of all <em>Lottia scabra</em> found within territory boundaries</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000645.rdf
Name: L_scabra_density
Units: individual/cm^2
Description: <p>Density of <em>L. scabra</em> within owl limpet territory boundaries. Calculated as L_scabra/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000646.rdf
Name: L_digitalis
Units: unitless
Description: <p>Count of all <em>Lottia digitalis</em> found within territory boundaries</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000647.rdf
Name: L_digitalis_density
Units: individual/cm^2
Description: <p>Density of <em>L. digitalis</em> within owl limpet territory boundaries. Calculated as L_digitalis/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000648.rdf
Name: L_pelta
Units: unitless
Description: <p>Count of all <em>Lottia pelta</em> found within territory boundaries</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000649.rdf
Name: L_pelta_density
Units: individual/cm^2
Description: <p>Density of <em>L. pelta</em> within owl limpet territory boundaries. Calculated as L_pelta/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000650.rdf
Name: Nuttallina_density
Units: individual/cm^2
Description: <p>Density of <em>Nuttallina spp.</em> within owl limpet territory boundaries. Calculated as Nuttallina_sp/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000651.rdf
Name: Nuttallina_sp
Units: unitless
Description: <p>Count of all <em>Nuttallina spp.</em> found within territory boundaries</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000652.rdf
Name: Tegula_funebralis
Units: unitless
Description: <p>Count of all <em>Tegula funebralis</em> found within territory boundaries</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000653.rdf
Name: Tegula_funebralis_density
Units: individual/cm^2
Description: <p>Density of <em>Tegula funebralis</em> within owl limpet territory boundaries. Calculated as Tegula_funebralis/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000654.rdf
Name: Total_grazers
Units: unitless
Description: <p>Count of all grazers within owl limpet territory. Calculated by summing L_scabra, L_digitalis, L_pelta, Nuttallina_sp, Tegula_funebralis</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000655.rdf
Name: Total_grazers_density
Units: individual/cm^2
Description: <p>Density of all grazers within owl limpet territory. Calculated as Total_grazers/Territory_Area</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000656.rdf
Name: Length_initial
Units: mm
Description: <p>Initial length measurement for the focal owl limpet</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000657.rdf
Name: Width_initial
Units: mm
Description: <p>Initial width measurement for the focal owl limpet</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000658.rdf
Name: Site
Units: unitless
Description: <p>Location name</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000659.rdf
Name: Date_initial
Units: unitless
Description: <p>Initial date of sampling</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000660.rdf
Name: Length_final
Units: mm
Description: <p>Final length measurement for the focal owl limpet</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000661.rdf
Name: Width_final
Units: mm
Description: <p>Final width measurement</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000662.rdf
Name: Date_final
Units: unitless
Description: <p>Final date of sampling period</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000663.rdf
Name: dt
Units: days
Description: <p>length of sampling period</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000664.rdf
Name: RGR
Units: mm/mm/day
Description: <p>Relative growth rate across sampling period for the focal owl limpet</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000665.rdf
Name: Latitude
Units: Decimal degrees
Description: <p>Latitude of study site, positive is North</p>
http://lod.bco-dmo.org/id/dataset-parameter/1000667.rdf
Name: Longitude
Units: Decimal degrees
Description: <p>Longitude of study site, negative is West</p>
GB/NERC/BODC > British Oceanographic Data Centre, Natural Environment Research Council, United Kingdom
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
https://osprey.bco-dmo.org/dataset/1000468/data/download
download
onLine
dataset
<p>This dataset represents a subset of a longer-term monitoring effort of tagged Lottia gigantea individuals conducted across California intertidal sites. The dataset includes annual measurements collected between 2023 and 2024 and associated survey-derived habitat and grazer community metrics. The related dataset (found in the Related Dataset section) contains growth measurements from earlier survey years, but does not include community sampling data.</p>
<p><em>Variation in biotic communities</em>:</p>
<p>We surveyed <em>L. gigantea </em>habitats to test whether the biotic environment differed among the four range core sites and four expanding edge sites, and whether variation in <em>L. gigantea </em>performance was associated with the biotic environment. We considered Dillon Beach, Bodega Marine Reserve, Fort Ross, and Kruse Ranch to be in the expanded range (Sanford et al., 2019), and Vandenberg, Seal Beach, Soberanes Point, and Hopkins Marine Station to be in the range core. Given that <em>L. gigantea </em>have a patchy distribution (Fenberg &amp; Rivadeneira, 2011), we haphazardly established 50-100 1m<sup>2 </sup>plots with limpets present at each site, across approximately 300 m of intertidal habitat. Each plot was marked with marine epoxy (Zspar splash zone compound) in its center. Within each plot, we tagged a single focal <em>L. gigantea </em>using a small (&lt; 6 mm) Floy Tag fixed to the anterior end of the shell using a small dab of marine epoxy (Zspar splash zone compound). For each tagged focal limpet, we recorded growth rate using calipers to relate performance to variation in environmental factors.</p>
<p>For each plot in summer 2023, we sampled the community of competing species within the territories of the focal limpet from 8 sites. Owl limpets are sympatric with several other intertidal grazing species across their range, including limpets (<em>L. scabra, L. digitalis, L. pelta</em>), chitons (<em>Nutallina </em>spp.), and snails (<em>Tegula funebralis</em>) (Stimson, 1973). <em>L. gigantea </em>territories are clearly recognizable as darker areas on the substrate (Fenberg, 2013), so we counted all individuals of the above mentioned grazing species within the territories of the tagged focal limpets and measured the territory area on imageJ to record density (Schneider et al., 2012). In cases which the territory boundary was uncertain, or territories overlapped, we counted all individuals within a 0.25 m<sup>2</sup> quadrat, placed with the focal owl limpet at its center. We did not count grazers &lt; 5 mm as <em>Lottia </em>congeners are often indistinguishable at that size, cryptic, and difficult to count accurately.</p>
<p><em>Quantifying performance:</em></p>
<p>To quantify performance across the range in response to biotic drivers, we recorded organismal growth rate as a function of the environmental data collected within each 1m<sup>2</sup> plot. In <em>L. gigantea </em>growth rate is a strong metric for performance and fitness, as shell length scales with gonad mass (Kido &amp; Murray, 2003). We measured shell length for all tagged limpets from the anterior to posterior end of the shell using calipers. Each focal limpet was measured annually between 2021 and 2023 (see Related Dataset for additional data), and because limpet starting size differed, we calculated relative growth rate (RGR) as ln(SL<sub>Final</sub>/SL<sub>Initial</sub>/Δt), where SL is shell length and t is time (Paine et al., 2012).&nbsp;</p>
Specified by the Principal Investigator(s)
- Loaded tagging.growth.24.csv as table "res1" with empty string and "nd" treated as missing values
- Renamed 19 columns to replace dots and abbreviations with underscores and full names: Territory.Area -> Territory_Area, L.scabra -> L_scabra, L.scabra.density -> L_scabra_density, L.digitalis -> L_digitalis, L.digitalis.density -> L_digitalis_density, L.pelta -> L_pelta, L.pelta.density -> L_pelta_density, Nutallina.density -> Nutallina_density, Nuttallina.sp -> Nuttallina_sp, Tegula.funebralis -> Tegula_funebralis, Tegula.funebralis.density -> Tegula_funebralis_density, Total.grazers -> Total_grazers, Total.grazers.density -> Total_grazers_density, Length_i -> Length_initial, Width_i -> Width_initial, Date_i -> Date_initial, Length_f -> Length_final, Width_f -> Width_final, Date_f -> Date_final
- Stripped leading and trailing whitespace from Date_initial and Date_final columns
- Converted Date_initial from %m/%d/%y format to ISO date format %Y-%m-%d
- Converted Date_final from %m/%d/%y format to ISO date format %Y-%m-%d
- Renamed Nutallina_density to Nuttallina_density (corrected spelling)
- Replaced site code "BMR" with full name "Bodega Marine Reserve" in the Site column
- Output final data to 1000468_v1_limpet_tagging_growth_2023_2024.csv
Specified by BCO-DMO Data Managers
asNeeded
7.x-1.1
Biological and Chemical Oceanography Data Management Office (BCO-DMO)
Unavailable
508-289-2009
WHOI MS#36
Woods Hole
MA
02543
USA
info@bco-dmo.org
http://www.bco-dmo.org
Monday - Friday 8:00am - 5:00pm
For questions regarding this resource, please contact BCO-DMO via the email address provided.
pointOfContact
calipers
calipers
PI Supplied Instrument Name: calipers PI Supplied Instrument Description:For each tagged focal limpet, we recorded growth rate using calipers to relate performance to variation in environmental factors. Instrument Name: calipers Instrument Short Name: Instrument Description: A caliper (or "pair of calipers") is a device used to measure the distance between two opposite sides of an object. Many types of calipers permit reading out a measurement on a ruled scale, a dial, or a digital display.
Olympus Touch
Olympus Touch
PI Supplied Instrument Name: Olympus Touch PI Supplied Instrument Description:Camera: Olympus Touch Instrument Name: Camera Instrument Short Name:camera Instrument Description: All types of photographic equipment including stills, video, film and digital systems. Community Standard Description: http://vocab.nerc.ac.uk/collection/L05/current/311/
Floy Tag
Floy Tag
PI Supplied Instrument Name: Floy Tag PI Supplied Instrument Description:Within each plot, we tagged a single focal L. gigantea using a small (< 6 mm) Floy Tag fixed to the anterior end of the shell using a small dab of marine epoxy (Zspar splash zone compound). Instrument Name: labeling tag Instrument Short Name: Instrument Description: Passive devices attached to captured organisms to specifically identify them when recaptured after release.