Impact of Colonizer Copepods on Zooplankton Structure and Diversity in Contrasting Estuaries

Estuaries and Coasts, Journal Year: 2022, Volume and Issue: 45(8), P. 2592 - 2609

Published: July 21, 2022

Abstract The impact of the occurrence non-indigenous species (NIS) Acartia tonsa , Oithona davisae and Pseudodiaptomus marinus range-expanding copepods bifilosa Calanipeda aquaedulcis on structure diversity zooplankton communities was analyzed using 18 years (1998–2015) time series from contrasting estuaries Bilbao Urdaibai (Basque coast, Bay Biscay). Changes in were assessed by multivariate analyses taxa abundances changes descriptors alpha, beta, gamma diversity. most evident occurred at upper reaches estuary Bilbao, where an abundant less diverse brackish community, dominated NIS, A. O. succeeded a low abundance more community neritic origin. later establishment C. linked to further progressive increase seasonal pattern inner beta also significantly affected arrival NIS . In contrast, original Urdaibai, clearly far same copepod remained as best related habitats estuary.

Language: Английский

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Assessment of the climate and human impact on estuarine water environments in two estuaries of the Bay of Biscay

Oceanological and Hydrobiological Studies, Journal Year: 2016, Volume and Issue: 45(4), P. 505 - 523

Published: Dec. 1, 2016

Abstract The effect of climate variability on estuarine water environments was assessed in two systems the Bay Biscay, estuaries Bilbao and Urdaibai, with contrasting morphology, hydrodynamic features anthropogenic influence. To that purpose, main time scales relevant environmental factors were established along spatial salinity gradients and, using a combination multivariate regression analyses, contribution each factor to total variability, as well influence seasonal inter-annual environment variations assessed. major modes both accounted for by temperature together stratification and/or chlorophyll . This associated shown relationship air river flow. also temperature, dissolved oxygen Bilbao, transparency Urdaibai. These this case summer temperatures. Water quality variables, such transparency, found be sensitive reveal long term activities.

Language: Английский

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Coupling between Hydrodynamics and Chlorophyll a and Bacteria in a Temperate Estuary: A Box Model Approach

Water, Journal Year: 2019, Volume and Issue: 11(3), P. 588 - 588

Published: March 21, 2019

The spatial patterns of chlorophyll a and bacteria were assessed in temperate Atlantic tidal estuary during seasonal surveys, as well consecutive summer spring neap tides. A box model approach was used to better understand temporal dynamics these key estuarine descriptors. Lima (NW Portugal) divided into boxes controlled by salinity freshwater discharge balance equations derived for each variable, enabling the calculation horizontal vertical fluxes plankton and, therefore, production or consumption rates. Chlorophyll tended burst within oligohaline zone, whereas higher counts found mesohaline stretch. Whenever water column stratified, similar tide-independent trends bacterial fluxes, with net growth upper less saline boxes, beneath halocline. In non-stratified estuary, other controls emerged bacteria, such nitrogen carbon inputs, respectively. presented results show that, while hydrodynamics influenced variability, production/consumption rates resulted from interaction additional factors, namely geomorphological characteristics nutrient inputs. complex systems, rather simple remains useful tool task understanding coupling between behavior plankton, emerging contribution toward management systems.

Language: Английский

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Hypoxia in the St. Lawrence Estuary: How a Coding Error Led to the Belief that “Physics Controls Spatial Patterns”

PLoS ONE, Journal Year: 2015, Volume and Issue: 10(9), P. e0138858 - e0138858

Published: Sept. 23, 2015

Two fundamental sign errors were found in a computer code used for studying the oxygen minimum zone (OMZ) and hypoxia Estuary Gulf of St. Lawrence. These invalidate conclusions drawn from model, call into question proposed mechanism generating OMZ that challenges classical understanding. The study is being cited frequently, leading discipline wrong direction.

Language: Английский

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VARIACIÓN ESPACIAL Y TEMPORAL DEL FITOPLANCTON CON ÉNFASIS EN LAS FLORACIONES ALGALES FRENTE A LA PLAYA DE PESCADORES ARTESANALES DE CHORRILLOS / LIMA / PERÚ

Ecología Aplicada, Journal Year: 2019, Volume and Issue: 18(2), P. 133 - 133

Published: Dec. 12, 2019

Este estudio examinó la variabilidad espacial y temporal de las principales comunidades del fitoplancton en tres estaciones playa Pescadores Artesanales Chorrillos, Lima, Perú, relación con variables fisicoquímicas. Se realizaron mediciones in situ temperatura pH todos los meses durante un año salinidad oxígeno disuelto medio año. colectaron muestras agua superficial para determinar composición fitoplancton. identificcaron total 120 taxa organismos fitoplanctónicos, pertenecientes a 46 familias 66 géneros. Las especies fueron dominadas por diatomeas (59.2%) dinoflagelados (35.6%). La abundancia estuvo dominada Raphidophyceae (73.72%), seguido (11.75%) nanoflagelados (< 20 µm) (11.53%). Asimismo, se registraron floraciones algales originadas especies, Thalassionema nitzschioides, Skeletonema costatum, Akashiwo sanguinea, Heterosigma akashiwo, Prorocentrum gracile, P. balticum, minimum, Scrippsiella acuminata, Dictyocha fibula, Leucocryptos marina todo el periodo estudio. mayor observó verano otoño. encontraron correlaciones significativas entre determinó que factores abióticos como: disuelto, temperatura, favorecieron presencia algales. existencia potencialmente tóxico/nocivo sugiere monitoreo frecuente algas nocivas (FAN) Chorrillos.

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