Description
Original provider:
Matthew Witt, University of Exeter
Dataset credits:
Matthew Witt, University of Exeter
Abstract:
We present data spanning approximately 100 years regarding the spatial and temporal occurrence of marine turtle sightings and strandings in the
northeast Atlantic from two public recording schemes and demonstrate potential signals of changing population status. Records of loggerhead (n = 317) and Kemp’s ridley (n = 44) turtles occurring on the European
continental shelf were most prevalent during the autumn and winter, when waters were coolest. In contrast, endothermic leatherback turtles (n = 1,668) were most common during the summer. Analysis of the spatial distribution of hard-shell marine turtle sightings and strandings highlights a pattern of decreasing records with increasing latitude. The spatial distribution
of sighting and stranding records indicates that arrival in waters of the European continental shelf is most likely driven by North Atlantic current systems. Future patterns of spatial-temporal distribution, gathered
from the periphery of juvenile marine turtles habitat range, may allow for a broader assessment of the future impacts of global climate change on species
range and population size.
Purpose:
We set out to determine the spatial and temporal trends for sightings, strandings and captures of hard-shell marine turtles in the northeast Atlantic from two recording schemes. One recording scheme (presented here) included marine turtle sightings, strandings and captures occurring in French waters that originated from annual sightings and strandings publications of Duguy and colleagues (Duguy 1990, 1992, 1993, 1994, 1995, 1996, 2004; Duguy et al. 1997a, b, 1999, 2000, 2001, 2002, 2003). Records presented in Duguy publications prior to 2001 contained location descriptions, providing no geographic coordinates with error estimates. Longitude and latitude positions for these events were estimated to be the closest coastal point to the descriptive location.
Duguy publications, 2001 onwards, were accompanied by maps displaying the approximate location of sightings and strandings events. These maps were digitized and georeferenced and coordinate positions determined for all appropriate records. Georefenced hard-shell turtle (Lk and Cc) capture/sighting/stranding records from the papers of Duguy for France 1990-2003 (featured in Witt et al. 2007) only includes records that could have coordinates derived from their locational descriptions.
The second recording scheme used were records of sightings and strandings of marine turtles in the British Isles obtained from the TURTLE database operated by Marine Environmental Monitoring. Data from the TURTLE database were submitted to EurOBIS and can be viewed on OBIS-SEAMAP: Marine Turtles.
Supplemental information:
Abstract is from Witt et al. 2007; data included in this dataset are a subset of data presented in Witt et al. 2007.
References:
Duguy, R. 1990. Observations de tortues marines en 1990 (Manche et Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 7:1053–1057.
Duguy, R. 1992. Observations de tortues marines en 1991 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:35–37.
Duguy, R. 1993. Observations de tortues marines en 1992 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:129–131.
Duguy, R. 1994. Observations de tortues marines en 1993 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:235–238.
Duguy, R. 1995. Observations de tortues marines en 1994 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:403–406.
Duguy, R. 1996. Observations de tortues marines en 1995 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:505–513.
Duguy, R. 2004. Observations de tortues marines en 2003 (cotes Atlantiques). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 9:361–366.
Duguy, R., P. Moriniere and A. Meunier. 1997a. Observations de tortues marines en 1997. Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:761–779.
Duguy, R., P. Moriniere and M.A. Spano. 1997b. Observations de tortues marines en 1996 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:625–632.
Duguy, R., P. Moriniere and A. Meunier. 1999. Observations de tortues marines en 1998 (Atlantique). Annales de la Societe des Sciences Naturelles de la Charente-Maritime:911–924.
Duguy, R., P. Moriniere and A. Meunier. 2000. Observations de tortues marines en 1999. Annales de la Societe des Sciences Naturelles de la Charente-Maritime 8:1025–1034.
Duguy R, P. Moriniere and A. Meunier. 2001. Observations tortues marines en 2000 (Atlantique et Manche). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 9:17–25.
Duguy, R., P. Moriniere and A. Meunier. 2002. Observations de tortues marines en 2001 (Atlantique et Manche). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 9.
Duguy, R., P. Moriniere and A. Meunier. 2003. Observations de tortues marines en 2002 (Atlantique et Manche). Annales de la Societe des Sciences Naturelles de la Charente-Maritime 9:265–273.
Data Records
The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 199 records.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versions
The table below shows only published versions of the resource that are publicly accessible.
How to cite
Researchers should cite this work as follows:
Witt, M. 2012. Marine turtle sightings, strandings and captures in French waters 1990-2003. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/877) on yyyy-mm-dd.
Rights
Researchers should respect the following rights statement:
The publisher and rights holder of this work is OBIS-SEAMAP. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC 4.0) License.
GBIF Registration
This resource has been registered with GBIF, and assigned the following GBIF UUID: 41419ee9-ef8d-4f80-8dd3-dc7716c7f82c. OBIS-SEAMAP publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.
Keywords
Occurrence,Land-based,Sightings; Observation; Occurrence
External data
The resource data is also available in other formats
OBIS-SEAMAP Dataset Page | http://seamap.env.duke.edu/dataset/877 UTF-8 Interactive map |
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FGDC Metadata | http://seamap.env.duke.edu/dataset/877/xml UTF-8 XML |
Contacts
- Metadata Provider ●
- Distributor
Geographic Coverage
United Kingdom
Bounding Coordinates | South West [43.39, -4.83], North East [51.05, 2.367] |
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Taxonomic Coverage
Scientific names are based on the Integrated Taxonomic Information System (ITIS).
Species | Caretta caretta (Loggerhead Sea Turtle), Lepidochelys kempii (Kemp's Ridley) |
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Temporal Coverage
Start Date / End Date | 1990-01-08 / 2003-08-10 |
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Project Data
No Description available
Title | Marine turtle sightings, strandings and captures in French waters 1990-2003 |
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Funding | NA |
The personnel involved in the project:
- Owner
Sampling Methods
NA
Study Extent | NA |
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Method step description:
- NA
Collection Data
Collection Name | zd_877 |
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Collection Identifier | zd_877 |
Parent Collection Identifier | OBIS-SEAMAP |
Additional Metadata
marine, harvested by iOBIS
Purpose | We set out to determine the spatial and temporal trends for sightings, strandings and captures of hard-shell marine turtles in the northeast Atlantic from two recording schemes. One recording scheme (presented here) included marine turtle sightings, strandings and captures occurring in French waters that originated from annual sightings and strandings publications of Duguy and colleagues (Duguy 1990, 1992, 1993, 1994, 1995, 1996, 2004; Duguy et al. 1997a, b, 1999, 2000, 2001, 2002, 2003). Records presented in Duguy publications prior to 2001 contained location descriptions, providing no geographic coordinates with error estimates. Longitude and latitude positions for these events were estimated to be the closest coastal point to the descriptive location. Duguy publications, 2001 onwards, were accompanied by maps displaying the approximate location of sightings and strandings events. These maps were digitized and georeferenced and coordinate positions determined for all appropriate records. Georefenced hard-shell turtle (Lk and Cc) capture/sighting/stranding records from the papers of Duguy for France 1990-2003 (featured in Witt et al. 2007) only includes records that could have coordinates derived from their locational descriptions. The second recording scheme used were records of sightings and strandings of marine turtles in the British Isles obtained from the TURTLE database operated by Marine Environmental Monitoring. Data from the TURTLE database were submitted to EurOBIS and can be viewed on OBIS-SEAMAP: Marine Turtles. |
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Alternative Identifiers | http://ipt.env.duke.edu/resource?r=zd_877 |