IOV - Distribución espacial y temporal del fitoplancton en el Golfo de Cariaco
Citation
Calvo-Trujillo A, Rincones-Reyes K, Díaz-Ramos J R, Marquez-García B, Subero-Pino S, Elista-Rodriguez E, Troccoli L (2022): IOV - Distribución espacial y temporal del fitoplancton en el Golfo de Cariaco. v1.7. Caribbean OBIS Node. Dataset/Samplingevent. https://ipt.iobis.org/caribbeanobis/resource?r=iov_udo_fitoplancton_calvo&v=1.7 https://doi.org/10.15468/eqav4c accessed via GBIF.org on 2024-08-15.Description
Coastal phytoplankton is affected by natural and anthropic processes. To analyze the influence of some of these processes, the spatial and temporal distribution of phytoplankton in the Gulf of Cariaco, Sucre state, was evaluated. Samples (0-10 m) were collected with Niskin bottles (5 L) in seven stations between February 2014 and January 2015. Transparency (m), salinity (UPS), temperature (° C), chlorophyll concentration a (mg m-3), and phytoplankton abundance (org mL-1) were measured. A nonparametric analysis of variance and multivariate methods (PCA, CCA, and nMDS) were used to analyze the results. The 0 - 10 m stratum was homogeneous with respect to all variables except temperature which ranged from 20.1 to 29.1 °C (March and October, respectively). Temporally, the variables were heterogeneous. Biomass fluctuates between undetectable (ND) and 17.5 mg m-3 (December and March). While microalgal abundance oscillated between 0.24 and 1.85 x 103 org mL-1 (April and February). The community was dominated by diatoms, nanoflagellates, and coccolithophorids. The first two groups were associated with turbulent, nutrient-rich waters. The nMDS separated the community into the three periods previously described for the region. Likewise, the CCA detected that wind speed and temperature were the most influential variables on the phytoplankton community during upwelling and relaxation period, respectively. In the transition period, none of the variables studied affect the community. This is the first time that coccolithophores are reported as part of the dominant flora in the Gulf of Cariaco. This change suggests modifications in the oceanographic conditions of the study areaSampling Description
Study Extent
The Gulf of Cariaco is located in the northeastern region of Venezuela, between 10° 36' 00" - 10° 26' 20" N and 64° 13' 40'' - 63° 38' 20" W (Caraballo, 1982a). Its general characteristics are described in Caraballo (1982a, 1982b). The Gulf is a water body that is influenced by the Northeast trade winds during the first part of the year and, is influenced by the Intertropical Convergence Zone (ITCZ) during the second half of the year (Quintero et al., 2004, López-Monroy and Troccoli- Ghinaglia, 2014). Considering its high productivity, this study proposes to evaluate the spatio-temporal variation in phytoplankton composition, abundance and, diversity in the Gulf of Cariaco.Sampling
Samples were taken monthly at seven stations (georeferenced, using a Garmin GPS), on the surface and at 10 m depth using a Niskin bottle (5L) from February to july 2014Method steps
- Water transparency was measured in situ with a Secchi disc (m), and salinity (UPS) and temperature (ºC) were measured with a multiparameter probe (Jenway 970 DO2 Meter). Measurements of chlorophyll a (chlor. a) and phaeopigments was performed according to the Lorenzen method, described and improved by Parsons et al. (1984), whereas the determination of microalgal abundance was carried out according to the Utermöhl sedimentation method that is described by Edler and Elbrächter (2010). Phytoplankton species were identified according to the works of Cupp (1943), Tomas (1997), Berard- Thierrault et al. (1999) and Rivera-Tenenbaum (2006).
- In addition, species diversity was calculated with the Shannon index (Krebbs, 1999). Wind speed data (average of the sampling day and the three previous days) were supplied by the meteorological station of the Antonio José de Sucre Airport, Cumaná, Sucre State. Oceanographic periods were established by modifying the periods proposed by Rivas-Rojas et al. (2007). Samples corresponding to the upwelling period (February-May) presented a temperature of ≤ 24 °C, nitrite + nitrate concentrations between 1 and 7.5 μmol L-1 and phosphate concentrations between 0.5 and 1.2 μmol L-1. Samples from the transition period (June- August) were characterized by temperature values in the range 24 < X ≤ 26 °C, nitrite + nitrate concentrations from 0.5 to 4 μmol L-1 and phosphate concentrations from ND to 0.8 μmol L-1. Finally, during the calm season (September-January) the temperature was ≥ 26 °C, approximate nitrite + nitrate concentrations varied between 0.5 - 1 μmol L-1 and phosphate concentrations ranged from 0.3 to 1 μmol L-1. The transition period corresponds to the secondary upwelling period that is described by Rueda-Roa et al. (2018).
Additional info
La transcripción y curaduría de este conjunto de datos fue posible gracias al apoyo de CaribeSur, proyecto BID-CA2020-025-NACTaxonomic Coverages
Efforts were made to identify the phytoplankton to species, in some cases even genus were identified.
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Cylindrotheca closteriumrank: species
-
Nitzschia longissimarank: species
-
Dinophysis acuminatarank: species
Geographic Coverages
The Gulf of Cariaco is located in the northeastern
region of Venezuela, between 10° 36' 00" - 10° 26' 20" N and 64° 13' 40'' - 63° 38' 20" W (Caraballo, 1982a). Its general characteristics are described in Caraballo
(1982a, 1982b).
Bibliographic Citations
- Asdrúbal Calvo-Trujillo, Karla Rincones-Reyes, José Rafael Díaz-Ramos, Brightdoom Márquez-García, Sonia Subero-Pino; Estefanía Elista-Ramírez y Luis Troccoli-Ghinaglia. 2018. Spatial and temporal phytoplankton distribution in the Gulf of Cariaco, Sucre State, Venezuela, February 2014 - January 2015. Bulletin of Marine and Coastal Research 47 (2), 71-90 -
Contacts
Asdrubal Calvo-Trujillooriginator
position: Researcher
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: calvo.t.a.j@gmail.com
userId: http://orcid.org/0000-0003-2288-4874
Karla Rincones-Reyes
originator
position: Researcher
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: krincones1924@hotmail.com
userId: http://orcid.org/0000-0002-1506-1792
Jose Rafael Díaz-Ramos
originator
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: jrdiazramos@yahoo.com
userId: http://orcid.org/0000-0002-0167-6665
Brightdoom Marquez-García
originator
position: Researcher
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: bmarquez2001@gmail.com
userId: http://orcid.org/0000-0002-2703-8696
Sonia Subero-Pino
originator
position: Research
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: soniasubero@gmail.com
userId: http://orcid.org/0000-0002-3562-5604
Estefania Elista-Rodriguez
originator
position: Research
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: estefaniabiology@hotmail.com
userId: http://orcid.org/0000-0002-1920-317X
Luis Troccoli
originator
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: luis.troccoli@gmail.com
userId: http://orcid.org/0000-0001-8684-6741
Brightdoom Marquez
metadata author
position: Researcher
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: bmarquez2001@gmail.com
userId: http://orcid.org/0000-0002-2703-8696
Brightdoom Marquez
author
position: Researcher
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: bmarquez2001@gmail.com
userId: http://orcid.org/0000-0002-2703-8696
Brightdoom Marquez
administrative point of contact
Instituto Oceanografico de Venezuela
Av. Universidad
Cumana
6101
Sucre
VE
email: bmarquez2001@gmail.com
userId: http://orcid.org/0000-0002-2703-8696