Primary production and phytoplanktonic biomass in shallow marine environments of central Chile: Effect of coastal geomorphology

Henríquez, Luis A.; Daneri, Giovanni; Muñoz, Carlos; Montero, Paulina; Veas, Rodrigo; Palma, Álvaro T.

doi:10.1016/j.ecss.2006.12.013

Cited by 22 publications

(18 citation statements)

References 38 publications

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“…In highly dynamic coastal systems where circulation and wind regimes interact with the local geomorphology it is possible to identify sites with higher retention of phytoplanktonic biomass (Roughan et al 2005a, Mace & Morgan 2006, Henríquez et al 2007). In our case, and during normal summer conditions, the wind typically comes from the south and south west with magnitudes that generate coastal upwelling events which in turn promote high levels of primary production (Daneri et al 2000, Poulin et al 2002.…”

Section: Discussionmentioning

confidence: 99%

“…At a local scale (100's m), and under upwellingfavorable conditions, conspicuous retention zones with higher levels of phytoplanktonic primary production were found to occur at lee or protected sides of small headlands or little peninsulas, induced by topographic features, orientation, geometry, size and depth of these type of coastal geomorphological formations (Roughan et al 2005b, Palma et al 2006, Henríquez et al 2007. Then, we hypothesize that such features will cease to occur, and even revert, under non-upwelling/relaxation conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Gross primary production (GPP), net primary production (NPP) and community respiration (CR) were determined in surface water samples during the summer 2006 from in vitro changes in dissolved oxygen after light and dark bottle incubations using Winkler methodology (Strickland & Parsons 1972, Macedo et al 1998, Cermeño et al 2006, Henríquez et al 2007). The water samples were dispensed into 125-mL borosilicate bottles through a silicon hose placed at the bottom of each bottle in order to keep turbulence to a minimum.…”

Section: Community Photosynthesis and Respirationmentioning

confidence: 99%

“…From local to regional scales, several studies agree that geomorphological factors may influence the occurrence of coastal fronts or the presence of nearshore retention zones that may modify patterns of aggregation and transport of benthic invertebrate larvae (Wing et al 1998, Archambault & Bourget 1999, Botsford 2001, Poulin et al 2002, Palma et al 2006 and furthermore, geomorphological factors influence the distribution of phytoplankton biomass and production (Archambault et al 1999, Shanks & McCulloch 2003, Henríquez et al 2007.…”

Section: Introductionmentioning

confidence: 99%

“…The rate at which this PP occurs in very near shore coastal settings has been scarcely quantified and very few studies have focused their attention on the short-term variability in PP, CR and on distribution and abundance of phytoplanktonic biomass (Chl-a) at scales ranging from hundreds of meters to few kilometers (but see Henríquez et al 2007). Measuring the rate of evolution of oxygen produced, the prime methodology used in the present study is a widely used approach for estimating gross primary production (GPP), net primary production (NPP) and community respiration (CR) in coastal waters and has allowed estimations of carbon flux in these environments (Macedo et al 1998, Daneri et al 2000, York et al 2001, Hashimoto et al 2005, Cermeño et al 2006.…”

Section: Introductionmentioning

confidence: 99%

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Phytoplanktonic primary production modulated by coastal geomorphology in a highly dynamic environment of central Chile

Palma

Henríquez

Ojeda

2009

Rev. biol. mar. oceanogr.

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Resumen.-La circulación asociada a surgencias costeras tiene un efecto regional sobre la comunidad fitoplanctónica (i.e. aumento de las tasas fotosintéticas, incremento en biomasa), pero su influencia a escalas espaciales locales es menos clara. A una escala local (cientos de metros) y bajo condiciones de surgencia, zonas de retención con altos niveles de producción primaria (PP) tienden a ocurrir en el lado protegido de pequeñas penínsulas inducidas por la orientación, geometría, tamaño y geomorfología general de este tipo de formaciones costeras. Nosotros cuantificamos producción primaria neta (NPP), bruta (GPP), respiración comunitaria (CR) y biomasa (Chl-a) de ensambles naturales de fitoplancton en ambientes costeros de Chile central. El principal objetivo fue determinar un patrón a corto plazo en PP y CR en ambos lados de dos pequeñas penínsulas en Chile central, donde son esperables diferencias mensurables en varias variables ambientales. Nuestra hipótesis de trabajo es que estas diferencias no ocurren bajo condiciones de relajación o de no-surgencia. Los resultados indican que NPP, GPP y CR difieren a una escala local y, contrariamente a lo reportado previamente, encontramos que el debilitamiento de los vientos favorables a las surgencias pueden generar un patrón opuesto a lo observado durante un periodo activo de surgencia, donde el sitio expuesto retiene altas concentraciones de biomasa y exhibe elevados niveles de PP comparados con el sitio protegido. Nuestros resultados destacan la importancia de la variabilidad a corto plazo de PP y CR y su acople con la distribución y abundancia del fitoplancton y su rápida respuesta a una escala espacial local.Palabras clave: Oceanografía costera, surgencia, biomasa fitoplanctónica, flujo de carbono, morfología costera Abstract.-Coastal upwelling circulation has a regional fertilizing effect upon phytoplanktonic communities (i.e. enhancement of photosynthetic rates, increased biomass), but its influence at smaller spatial and temporal scales is less clear. At local scale (100's m) and under upwelling-favorable conditions, retention zones with higher primary production (PP) levels tend to occur at the lee or protected side of small headlands induced by the orientation, geometry, size and general geomorphology of these coastal formations. Here we quantified net and gross primary production (NPP and GPP), community respiration (CR) and biomass (Chl-a) of natural phytoplankton assemblages in coastal environments of central Chile. The main goal was to determine short-term patterns in PP and CR around two small peninsulas in central Chile where measurable differences in several environmental variables can be expected, and we hypothesize that differences will no longer occur under non-upwelling/relaxation conditions. Results indicate that NPP GPP and CR differ at local scale, and contrary to previous findings we found that weakening of upwelling-favorable winds can generate an opposite pattern to that observed under active upwelling periods, whereas the exposed site retai...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Community Photosynthesis and Respirationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phytoplanktonic primary production modulated by coastal geomorphology in a highly dynamic environment of central Chile

Palma

Henríquez

Ojeda

2009

Rev. biol. mar. oceanogr.

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Coastal geomorphology and oceanographic features shape subtidal benthic communities in management areas of central Chile

Hernández

Tapia

Saldías

et al. 2020

Aquatic Conservation

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The spatial variation in community structure among 30 areas for the management and exploitation of benthic resources (AMEBRs) in central Chile was assessed from surveys conducted during the same spring–summer season. One hundred taxa identified in the subtidal surveys were grouped into 10 functional groups. The influence and relative importance of external factors over benthic associations were assessed through nonmetric multidimensional scaling (NMDS) and path analysis. Three main categories of external factors were considered: ‘terrain traits’ (e.g. coastline exposure), ‘surface‐ocean conditions’ (e.g. sea surface temperature, SST), and ‘fishery‐related variables’ (e.g. cumulative landings). The NMDS revealed a strong association between benthic community structure and both terrain and surface‐ocean conditions (42% of variance explained by permutational multivariate analysis of variance), but not with fishery‐related variables. Assemblages typical of rocky substrates were associated with larger seasonal fluctuations in SST and surface chlorophyll a. The presence of soft‐bottom functional groups was associated with higher levels of surface fluorescence and larger seasonal fluctuations in a satellite‐derived proxy for river‐plume influence (nLw645). A path analysis model for hard‐bottom communities reached a 49% goodness of fit (GOF), with the presence of epifaunal filter‐feeders, grazers, predators, and scavengers being significantly correlated with leathery and corticated foliose algae, which in turn depend on the fraction of rocky substrate in the AMEBR; the fraction of rocky substrate is positively correlated with coastline exposure. The model for soft‐bottom communities reached a 52% GOF with the presence of infaunal filter‐feeders and epifaunal detritivores depending directly on SST and surface chlorophyll a. The fishery‐related variables considered in the model had no apparent effect on the structure of either type of subtidal community. These results provide a hierarchy of physical–biological associations determining the functional composition of subtidal benthic communities in management areas along central Chile. This knowledge may improve future assessments of ecosystem response to changes in environmental conditions and management strategies.

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Description, seasonal morphological variation, and molecular identification of Paraxanthus barbiger megalopae obtained from the natural environment

Ampuero¹,

Palma

Véliz

et al. 2009

Helgol Mar Res

Self Cite

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Larval identiWcation represents a powerful tool for detailed studies on recruitment and population dynamics in marine invertebrates. However, intra-speciWc morphological variation can become a serious limitation for the correct identiWcation at species level. High morphological variation can be expected in species with continuous breeding periods because larvae are exposed to seasonal Xuctuations in physical and biological factors during their development in the plankton. We describe, for the Wrst time, the megalopae of Paraxanthus barbiger, one of the most common and abundant brachyuran crabs along the coast of Chile. To validate larvae identiWcation, the 16S rRNA gene was sequenced from both megalopae and adults, and was compared with sequences of three sympatric species. In addition, size, body shape, and appendage setation pattern variations were analyzed with a year-round sampling scheme. The results demonstrated high seasonal phenotypic plasticity in size. Despite these diVerences, certain conservative characteristics exist which can be very useful for identiWcation at species level.

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Primary production and phytoplanktonic biomass in shallow marine environments of central Chile: Effect of coastal geomorphology

Cited by 22 publications

References 38 publications

Phytoplanktonic primary production modulated by coastal geomorphology in a highly dynamic environment of central Chile

Phytoplanktonic primary production modulated by coastal geomorphology in a highly dynamic environment of central Chile

Coastal geomorphology and oceanographic features shape subtidal benthic communities in management areas of central Chile

Description, seasonal morphological variation, and molecular identification of Paraxanthus barbiger megalopae obtained from the natural environment

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