Mass mortality event in a small saline lake (Lake Rogoznica) caused by unusual holomictic conditions

Barić, Ante; Grbec, Branka; Kušpilić, Grozdan; Marasović, Ivona; Ninčević, Živana; Grubelić, Ivana

doi:10.3989/scimar.2003.67n2129

Cited by 30 publications

(24 citation statements)

References 31 publications

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“…They have been documented at the species and community levels. These catastrophic events can occur due to different reasons, such as diseases (Carpenter, 1990), hurricane effects (Stoddart, 1962;Glynn et al, 1964;Orihuela et al, 1991), a combination of different biological and oceanographic processes (hydrology, meteorological components, high pelagic productivity, pollution) (Stachowitsch, 1984), unusual holomictic conditions (Barić et al, 2003), high temperatures in intertidal areas (Tsuchiya, 1983), or upwelling events and severe salinity declines (Goodbody, 1961;Laboy-Nieves et al, 2001). Nevertheless, in Buchuaco, community mass mortality was most likely induced by depletion of dissolved oxygen due to the combined effects of the prolonged exposure of the marine bottom to the air, wind stillness and high day temperatures.…”

Section: Relative Growthmentioning

confidence: 99%

Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex

Carmona-Suárez¹

2007

Sci. Mar.

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SUMMARY: Spatial distribution, population density, number of ovigerous females, and relative growth of Microphrys bicornutus were studied in an extremely shallow Thalassia complex (Buchuaco-Venezuela). Monthly sampling was undertaken in 5 different biotopes (zones) (July 1988 to December 1990. Zone 3 (coral rubble) was the least populated by M. bicornutus. The highest densities were found in Zones 1 (coral rubble and macro algae) and 4 (Thalassia and calcareous algae). Crab size ranged between 1.86 and 35.40 mm (carapace length). The largest mean size was found in Zones 2 and 5, and the smallest in Zone 1. The least mean percentage of ovigerous females was found in Zone 3, and the highest in Zone 5. There were strong temporal fluctuations, with the absence of ovigerous females in the first months of each year. The biometric data showed that pre-pubertal males ranged from 1.80 to 24.20 mm carapace length, and post-pubertals from 15.16 to 26.15. Pre-pubertal females ranged from 3.16 to 20.25 and post-pubertals from 8.84 to 21.85. Zone 3 was the most inadequate biotope for M. bicornutus, as it had the lowest density and the least mean percentage of ovigerous females. Zone 4 was the most appropriate biotope. Temporal absence of ovigerous females and the small sizes of the crabs in Buchuaco could be due to extreme environmental conditions. Keywords: Crustacea, Brachyura, spider crabs, Microphrys bicornutus, spatial distribution, population density, relative growth. RESUMEN: DISTRIBUCIÓN ESPACIAL, DENSIDAD Y CRECIMIENTO RELATIVO DE MICROPHRYS BICORNUTUS (LATREILLE, 1826) (BRACHYURA: MAJIDAE) EN CINCO BIOTOPOS DE UN COMPLEJO DETHALASSIA. -Se estudió la distribución espacial, densidad poblacional, número de hembras ovadas, y crecimiento relativo de Microphrys bicornutus en un complejo de Thalassia extremadamente somero (Buchuaco-Venezuela). Se hicieron muestreos mensuales en 5 biotopos diferentes (zonas) (de julio de 1988 a diciembre 1990). La Zona 3 (cascajos de coral) fue la menos poblada. Las mayores densidades se encontraron en las Zona 1 (cascajos de coral y macroalgas) y 4 (Thalassia y algas calcáreas). El tamaño varió entre 1.86 y 35.40 mm (largo de caparazón). Los mayores tamaños se encontraron en las Zonas 2 y 5, y los más pequeños en la Zona 1. El menor porcentaje de hembras ovadas se encontró en la Zona 3, y el mayor en la Zona 5. Hubo grandes fluctuaciones temporales, con la ausencia de hembras ovadas en los primeros meses de cada año. De los datos de biometría, los machos prepubertarios midieron desde 1.80 a 24.20 mm (largo de caparazón), y los postpubertarios desde 15.16 a 26.15. Las hembras prepubertarias midieron desde 3.16 a 20.25, y las postpubertarias desde 8.84 a 21.85. La Zona 3 fue el biotopo más inadecuado para M. bicornutus, debido a la menor densidad y el menor porcentaje de hembras ovadas. La Zona 4 fue el biotopo más adecuado. La ausencia temporal de hembras ovadas y el menor tamaño de los cangrejos en Buchuaco pueden ser debido a condiciones extremas ambientales.

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Section: Relative Growthmentioning

confidence: 99%

Spatial distribution, density, and relative growth of Microphrys bicornutus (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a Thalassia complex

Carmona-Suárez¹

2007

Sci. Mar.

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“…Then the presence of RSS (sulphide, polysulphide and colloidal sulphur formed by oxidation) can be found through the entire water column . On the other hand, if the mixing is slow, oxygenated surface waters diffuse to the bottom of the lake, or the bottom waters, with plenty of sulphide and nutrients, diffuse to the surface layer of the lake (as was recorded in September of 2003 andNovember of 2006); the mixing process can last up to 7 days, while the surface layer remains rich in oxygen the whole time (CIGLENEČKI unpublished data). In most cases when RSS, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…This event, followed by massive mortality of all organisms, was taken as a zero point from which ecological recovery of the lake was monitored (BARIĆ et al 2003, ŠESTANOVIĆ et al 2005, SVENSEN et al 2008, ŽIC et al 2010. Before the anoxic event in 1997, the dominant species in the phytoplankton was the diatom Pseudo-nitzschia spp., which accounted for 88% of the phytoplankton community.…”

Section: Introductionmentioning

confidence: 99%

Diatoms in an extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

Malešević¹,

Ciglenečki²,

Bura-Nakić³

et al. 2015

Acta Botanica Croatica

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-The Rogoznica Lake marine system is a small, karstic, naturally eutrophic and euxinic marine environment. Abundance and temporal distribution of phytoplankton was investigated in relation to environmental conditions in the period from 1998 to 2013. The 36 determined diatoms contributed 90% of the total phytoplankton abundance. The diatom composition is characterized by low species diversity and high single species abundance (up to 10 7 cells L -1). There were, on average, 2.6 diatom species per sample (maximum 14 diatom species per sample) refl ecting extreme environmental conditions. Dominant diatoms Thalassionema nitzschioides, Cyclotella choctawhatcheeana, Dactyliosolen fragilissimus and Chaetoceros curvisetus occurred repeatedly and were alternately dominant in the lake during the whole research period. Some diatoms were dominant only in limited period, like Cyclotella choctawhatcheeana (evident since 2001), and Pseudo-nitzschia spp. (evident in the period 2002 to 2009). It appears that the interplay of environmental conditions such as variability in thermohaline and redox conditions, nutrient and reduced sulphur concentration infl uence the phytoplankton development and abundance in the lake.

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“…Overturn of the water column under influence of strong cooling of the surface water has not been documented in SL so far, but such events were documented in the meromictic lake Dragon's Eye a few hundred kilometres farther north, causing the mass mortality of benthic and planktonic organisms in the early autumns of 1997 (Kršinić et al 2000, Barić et al 2003 and 2011 (Ciglenečki et al 2015). These events revealed that the copepod Acartia italica has been well adapted to the extreme conditions of anoxia, while some benthic Pennatae diatoms also survived anoxia in Dragon's Eye in 1997 (Barić et al 2003). In addition, the research in the northern Adriatic Sea at 24 m conducted by inducing anoxia revealed that meiobenthic harpacticoid copepods from the family Cletodidae were well adapted to anoxia (Grego et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Hypoxia in deep waters of moderately eutrophic marine lakes, Island of Mljet, eastern Adriatic Sea

Hrustić

Bobanović-Ćolić

2017

Sci. Mar.

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Summary:In this study, we explored the impact of eutrophication and stratification on hypoxia in deep waters of moderately warm Croatian marine lakes. Although the Mljet Lakes (MLs) are predominantly oligotrophic, mesotrophic conditions are present at depths below 20 m in the Small Lake (SL) and below 30 m in the Big Lake (BL), along with higher apparent oxygen utilization (AOU). Hypoxia at depths ≥25 m in SL and and ≥40 m in BL was observed between October 2009 and January 2010, and in SL in summer (July and September 2010). Significant differences (p<0.05) in several physical, biological and chemical parameters were detected between the lakes, while AOU, derived oxygen utilization rate (OUR) and organic carbon remineralization rate (OCRR) were not significantly different (p>0.05) between the lakes. An intense and persistent pycnocline throughout the year, comparatively high water temperature, extended water renewal time and summer phytoplankton bloom were identified as physical and biological parameters which might have significantly contributed to increased frequency of hypoxic events in a shallow SL. Significantly (p<0.05) higher ammonium concentration in SL, especially in its deep water, seems to be a long-term chemical feature related to the poor ventilation and higher sediment oxygen demand. At the current level of eutrophication and the present climate change trends, the MLs and similar systems may experience more persistent and intense stratification, which could further prevent mixing between upper and deep waters, likely leading to increasing duration of hypoxia and its negative impacts on the biodiversity of benthic communities.Keywords: hypoxia; eutrophication, marine lakes, coastal zone, Adriatic Sea, Mediterannean Sea. Hipoxia en aguas profundas de lagos marinos moderadamente eutróficos, isla de Mljet, mar Adriático orientalResumen: En este estudio, exploramos el impacto de la eutrofización y la estratificación sobre la hipoxia, en aguas profundas de los lagos marinos croatas moderadamente cálidos. Aunque los lagos Mljet (LsM) son predominantemente oligotróficos, las condiciones mesotróficas están presentes a profundidades inferiores a 20 m en el Lago Menor (LMe) y a 30 m en el Lago Mayor (LMa), junto con un mayor uso del oxígeno aparente (UOA). Fue observada hipoxia a profundidades ≥25 m en el LMe y ≥40 m en el LMa entre octubre de 2009 y enero de 2010, y en LMe en verano (julio y septiembre de 2010). Fueron detectadas diferencias significativas (p<0.05) en varios parámetros físicos, biológicos y químicos entre los lagos, mientras que el UOA, la tasa de utilización de oxígeno derivado y la tasa de remineralización de carbono orgánico no fueron significativamente diferentes (p>0.05) entre los lagos. La intensa y persistente picnoclina a lo largo del año, la temperatura comparativamente alta del agua, el tiempo prolongado de renovación del agua y la floración estival del fitoplancton se identificaron como parámetros físicos y biológicos que podrían haber contribuido significativamente incrementando...

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Mass mortality event in a small saline lake (Lake Rogoznica) caused by unusual holomictic conditions

Cited by 30 publications

References 31 publications

Spatial distribution, density, and relative growth of <i>Microphrys bicornutus</i> (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a <i>Thalassia</i> complex

Spatial distribution, density, and relative growth of <i>Microphrys bicornutus</i> (Latreille, 1826) (Brachyura: Majidae) in five biotopes in a <i>Thalassia</i> complex

Diatoms in an extreme euxinic environment (Rogoznica Lake, eastern Adriatic coast)

Hypoxia in deep waters of moderately eutrophic marine lakes, Island of Mljet, eastern Adriatic Sea

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