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PELD-ELPA Ecology of Lahille's bottlenose dolphin Tursiops truncatus gephyreus in the Patos Lagoon estuary and adjacent marine coast

Dataset homepage

Citation

Secchi E R, Fruet P, Genoves R C (2022). PELD-ELPA Ecology of Lahille's bottlenose dolphin Tursiops truncatus gephyreus in the Patos Lagoon estuary and adjacent marine coast. Version 1.11. Sistema de Informação sobre a Biodiversidade Brasileira - SiBBr. Sampling event dataset https://doi.org/10.15468/4nh9ng accessed via GBIF.org on 2023-05-29.

Description

Data on the distribution, reproductive and survival rates and abundance of the Lahille's bottlenose dolphin, Tursiops truncatus gephyreus, inhabiting the Patos Lagoon estuary and adjacent marine coast have been collected data from August 2005 to December 2018. Data have been acquired systematically and intensively applying direct observation and photo-identification approaches. This temporal data series allowed estimating the reproductive and survival rates of calf, juvenile and adult (females and males) dolphins and total population abundance. Variability in estimates was evaluated based on the continuity of the long-term surveys carried out during this period.

Purpose

The general purposes of this data bank are to provide information on observations of Lahille's bottlenose dolphins in the Patos Lagoon estuary.

Sampling Description

Study Extent

The area sampled is 140 km2 and encompasses the lower portion of the PLE (40 km2) and adjacent marine coast (50 km2 south and 50 km2 north of PLE in the coastal zone). Temporal coverage: August 2005 to December 2018.

Sampling

Distribution patterns and habitat use: All field work was carry out onboard a 5.6m inflatable boat equipped with 90 hp outboard engine, VHF radio, echo sounder and GPS. Boat-based surveys were conducted year-round on the core area of Patos Lagoon estuary (PLE) dolphin community. Surveys in estuarine waters were conducted following predefined zigzag transects whereas in the adjacent marine coast we run either zigzag or parallel-to-shore transects up to 20 km north and south of the estuary mouth, depending on the sea conditions. Surveys were halted when the sea state (Beaufort scale) were > 3. Transects were run at speeds between 18 and 22 km/h. Two observers positioned in the bow searched for dolphins visually. Whenever a dolphin group was sighted, the survey route was abandoned to approach the animals for photo-identification and to obtain data of group size and composition, sighting depth and geographical position. After a sufficient number of good-quality digital photographs of the dorsal fins of all presumed animals were taken, the survey was resumed.

Method steps

  1. Estimates of abundance, reproductive and survival rates: Abundance estimates were based on mark-recapture models for closed populations that deals with heterogeneity in capture probabilities. Survival rates were also estimated from mark-recapture models, but in this case, using open population models. The identification and monitoring of mother-calf pairs over time, from the beginning of the breeding season, were designed to allow approximate calculations of birth intervals and reproductive rates and their temporal trends.

Taxonomic Coverages

Collected species: Lahille's bottlenose dolphins (Tursiops truncatus gephyreus Montagu, 1821).
  1. Tursiops truncatus gephyreus
    common name: Lahille's bottlenose dolphins rank: species
  2. Animalia
    rank: kingdom
  3. Chordata
    rank: phylum
  4. Mammalia
    rank: class
  5. Cetartiodactyla
    rank: order
  6. Cetacea
    rank: infraorder
  7. Odontoceti
    rank: superfamily
  8. Delphinidae
    rank: family
  9. Tursiops
    rank: genus

Geographic Coverages

The study area of 140km² was divided in three major areas: estuary, with 40km² and the coastal areas south and north, each one with 50km². These three areas were subdivided in more three sub-areas: inner estuary (31° 58,94’S/52° 04,33’W; 31° 58,69’S/052° 03,30’W; 32° 03,00’S/052° 02,87’W and 32° 02,99’S/052° 04,24’W); medium estuary (32° 02,99’S/052° 04,24’W; 32° 03,00’S/052° 02,87’W; 32° 07,99’S/052° 05,66’W and 32° 08,00’S/052° 06,19’W); mouth of estuary (32° 08,00’S/052° 06,19’W; 32° 07,99’S/052° 05,66’W; 32° 11,21’S/052° 04,47’W and 32° 11,27’S/052° 04,83’W); adjacency south (32° 09,97’S/052° 05,90’W; 32° 11,27’S/052° 04,83’W; 32° 12,17’S/052° 07,84’W and 32° 11,40’S/052° 08,72’W); medium south (32° 11,40’S/052° 08,72’W; 32° 12,17’S/052° 07,84’W; 32° 16,01’S/052° 12,16’W and 32° 15,31’S/052° 13,12’W); further south (32° 15,31’S/052° 13,12’W; 32° 16,01’S/052° 12,16’W; 32° 20,42’S/052° 15,57’W and 32° 19,82’S/052° 16,60’W); adjacency north (32° 09,61’S/052° 04,85’W; 32° 11,20’S/052° 04,47’W; 32° 07,93’S/052° 02,33’W and 32° 07,20’S/052° 03,27’W); medium north (32° 07,20’S/052° 03,27’W; 32° 07,93’S/052° 02,33’W; 32° 03,73’S/051° 58,25’W and 32° 03,07’S/051° 59,24’W) and further north (32° 03,07’S/051° 59,24’W; 32° 03,73’S/051° 58,25’W; 31° 59,71’S/051° 53,95’W and 31° 59,03’S/051° 54,93’W).

Bibliographic Citations

  1. Lemos, V. M., Lanari, M., Copertino, M., Secchi, E. R., de Abreu, P. C. O., Muelbert, J. H., Garcia, A. M., Dumont, F. C., Muxagata, E., Vieira, J. P., Colling, A. & Odebrecht, C. (2022). Patos Lagoon estuary and adjacent marine coastal biodiversity long-term data. Earth System Science Data, 14(3), 1015-1041. - https://doi.org/10.5194/essd-14-1015-2022

Contacts

Eduardo Resende Secchi
originator
position: Researcher
FURG - University of Rio Grande
Av. Itália Km 08 P.O. Box 474
Rio Grande
96205001
Rio Grande do Sul
BR
email: edu.secchi@furg.br
userId: http://orcid.org/0000-0001-9087-9909
Pedro Fruet
originator
position: Researcher
FURG- University of Rio Grande
Av. Itália Km 08
Rio Grande
96205001
Rio Grande do Sul
BR
email: pfruet@gmail.com
Rodrigo Cezar Genoves
originator
position: Researcher
FURG - University of Rio Grande
Av. Itália Km 08
Rio Grande
96205001
Rio Grande do Sul
BR
email: genoves.rodrigo@gmail.com
Eduardo Resende Secchi
metadata author
position: Researcher
FURG - University of Rio Grande
Av. Itália Km 08 P.O. Box 474
Rio Grande
96205001
Rio Grande do Sul
BR
email: edu.secchi@furg.br
userId: http://orcid.org/0000-0001-9087-9909
Eduardo Resende Secchi
principal investigator
position: Researcher and Coordinator of the Brazilian Long Term Ecological Research (PELD Site 8)
FURG - University of Rio Grande
Av. Itália Km 08 P.O. Box 474
Rio Grande
96205001
Rio Grande do Sul
BR
Telephone: 5332336538
email: edu.secchi@furg.br
Clarisse Odebrecht
point of contact
position: researcher
FURG - University of Rio Grande
Av. Itália Km 08 P.O. Box 474
Rio Grande
96205001
Rio Grande do Sul
BR
email: doclar@furg.br
Valéria Marques Lemos
administrative point of contact
position: researcher
FURG - University of Rio Grande
Av. Itália Km 08
Rio Grande
96205001
Rio Grande do Sul
BR
email: vavadeleom@yahoo.com.br
Marianna Lanari
administrative point of contact
position: researcher
FURG - University of Rio Grande
Av. Itália Km 08
Rio Grande
96205001
Rio Grande do Sul
BR
email: marianna.lanari@gmail.com
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