scholarly journals Annual dynamics of phytoplankton abundance and community structure (2010) in Lake Caizi, Anhui Province

2012 ◽  
Vol 24 (5) ◽  
pp. 771-779 ◽  
Author(s):  
LIU Xuehua ◽  
◽  
ZHAO Xiuxia ◽  
GAO Pan ◽  
HAN Feiyuan ◽  
...  
Keyword(s):  
Community Structure ◽  
Anhui Province ◽  
Phytoplankton Abundance

scholarly journals The Connectivity of Nutrient Ratios on The Abundance of Phytoplankton Population In Jakarta Bay

2020 ◽  
Vol 147 ◽  
pp. 02012 ◽  
Author(s):  
Tumpak Sidabutar ◽  
Endang S. Srimariana
Keyword(s):  
Community Structure ◽  
Strong Correlation ◽  
Rainy Season ◽  
Mesh Size ◽  
Nutrient Ratios ◽  
Phytoplankton Abundance ◽  
Phytoplankton Population ◽  
Very High

The frequency of algal bloom’s event has been increased in Jakarta Bay, recently. Most of the bloom events were tend to be reoccurred after the rainy season. The research was conducted from 2008 until 2015 to study the linkage of nutrients and the ratios on the growth of the phytoplankton population. Collecting samples were conducted using a canonical plankton net of 20 µm mesh size, 125 cm length and 30 cm diameter of the opening mouth. The results of the study showed that the concentration of phosphate in the waters ranged from 0.01-12.5 µg/l (average 4.58 µg/l) and nitrate ranged from 0.01-15.89 µg/l (average 0.72 µg/l). The N/P ratio during the study ranging from 0.2 up to 45.4. High ratios of nutrients were mostly recorded in 2010 where the overall abundance of phytoplankton is very high. There is a strong correlation of N/P ratio with the community structure or composition of the phytoplankton population. The variability of phytoplankton abundance appears to be related to nutrient ratios of nitrate and phosphate.

Effects of Grazer Community Composition and Fish on Algal Dynamics

1992 ◽  
Vol 49 (9) ◽  
pp. 1908-1915 ◽  
Author(s):  
Andrew M. Turner ◽  
Gary G. Mittelbach
Keyword(s):  
Community Structure ◽  
Factorial Design ◽  
Chlorophyll A ◽  
Community Composition ◽  
Standing Crop ◽  
Zooplankton Community ◽  
The Other ◽  
Light Extinction ◽  
Phytoplankton Abundance ◽  
Zooplankton Community Structure

We examined the effects of grazer community composition and fish on phytoplankton abundance by manipulating zooplankton community structure and the intensity of planktivory in a factorial experiment. Enclosures (1700-L bags) were treated with fish (present/absent) and two grazer communities (one a large-bodied community dominated by Daphnia and the other a small-bodied community dominated by Ceriodaphnia) in a 2 × 2 factorial design. We sampled zooplankton and algae every 4–8 d during the 5-wk experiment. Algal biovolume, chlorophyll a, total particulates, and light extinction were all significantly higher in the presence of fish. Further, the effect of fish on algal standing crop did not depend on which grazer assemblage was initially present. Fish enhanced algal standing crop to the same degree in both Daphnia and Ceriodaphnia treatments. We discuss these results in light of patterns reported in the literature, and the nature of size-structured interactions among fish, zooplankton, and algae.

scholarly journals Nutrient ratios driven by vertical stratification regulate phytoplankton community structure in the oligotrophic western Pacific Ocean

Ocean Science ◽  
2021 ◽  
Vol 17 (6) ◽  
pp. 1775-1789
Author(s):  
Zhuo Chen ◽  
Jun Sun ◽  
Ting Gu ◽  
Guicheng Zhang ◽  
Yuqiu Wei
Keyword(s):  
Spatial Distribution ◽  
Community Structure ◽  
Pacific Ocean ◽  
Phytoplankton Community ◽  
Western Pacific ◽  
Vertical Stratification ◽  
Nutrient Ratios ◽  
Western Pacific Ocean ◽  
Phytoplankton Community Structure ◽  
Phytoplankton Abundance

Abstract. The stratification of the upper oligotrophic ocean has a direct impact on biogeochemistry by regulating the components of the upper-ocean environment that are critical to biological productivity, such as light availability for photosynthesis and nutrient supply from the deep ocean. We investigated the spatial distribution pattern and diversity of phytoplankton communities in the western Pacific Ocean (WPO) in the autumn of 2016, 2017, and 2018. Our results showed the phytoplankton community structure mainly consisted of cyanobacteria, diatoms, and dinoflagellates, while the abundance of Chrysophyceae was negligible. Phytoplankton abundance was high from the equatorial region to 10∘ N and decreased with increasing latitude in spatial distribution. Phytoplankton also showed a strong variation in the vertical distribution. The potential influences of physicochemical parameters on phytoplankton abundance were analyzed by a structural equation model (SEM) to determine nutrient ratios driven by vertical stratification to regulate phytoplankton community structure in the typical oligotrophic ocean. Regions with strong vertical stratification were more favorable for cyanobacteria, whereas weak vertical stratification was more conducive to diatoms and dinoflagellates. Our study shows that stratification is a major determinant of phytoplankton community structure and highlights that physical processes in the ocean control phytoplankton community structure by driving the balance of chemical elements, providing a database to better predict models of changes in phytoplankton community structure under future ocean scenarios.

scholarly journals Community Structure And Phytoplankton Abundance In Different Estuary In Coast Waters Lekok Pasuruan East Java

2021 ◽  
Vol 695 (1) ◽  
pp. 012001
Author(s):  
E. Y. Herawati ◽  
A. Darmawan ◽  
M. Azkiya
Keyword(s):  
Community Structure ◽  
Phytoplankton Abundance

scholarly journals Community structure of phytoplankton in the surface and thermocline layers of Sangihe and Talaud waters, Indonesia

2019 ◽  
Vol 9 (2) ◽  
Author(s):  
LADY A. SRIWIJAYANTI ◽  
DJUMANTO ◽  
RIZA Y. SETIAWAN ◽  
MOCHAMAD R. FIRDAUS ◽  
NURUL FITRIYA ◽  
...  
Keyword(s):  
Surface Layer ◽  
Community Structure ◽  
Morphological Character ◽  
Mesh Size ◽  
Environmental Parameter ◽  
Phytoplankton Species ◽  
Phytoplankton Abundance ◽  
Phytoplankton Diversity ◽  
Species Dominance ◽  
Counting Cell

Abstract. Sriwijayanti LA, Djumanto, Setiawan RY, Firdaus MR, Fitriya N, Sugeha HY. 2019. Community structure of phytoplankton in the surface and thermocline layers of Sangihe and Talaud waters, Indonesia. Bonorowo Wetlands 9: 51-58. The aim of this study was to determine the species dominance and distribution, and community structure of phytoplankton in the surface and thermocline layers of Sangihe and Talaud waters Indonesia. Phytoplankton samples were collected at the Sangihe-Talaud waters in October 2018 at 14 research stations. Water samples were collected at 5 m (surface) and thermoclines layers using rosette sampler equipped with Conductivity, Temperature, and Depth (CTD) recorder. Samples were concentrated to 40 ml using hand plankton net (mesh size 20 µm), then preserved with 4% formaldehyde. Phytoplankton species were identified using a guidebook based on morphological character traits. The cell count of each species of plankton was calculated using a Sedgwick rafter counting cell chamber. The result showed that there were 4 classes of phytoplankton (Bacillariophyceae, Dinophyceae, Cyanophyceae, and Raphydophyceae) which consisted of 59 species in the surface and 56 species in the thermocline, respectively. The abundance of phytoplankton at surface ranged from 77,333-4,024,000 cell m-3, meanwhile in the thermocline layer 8,000-542,222 cell m-3. The average of phytoplankton diversity of the surface was 0.82 and the thermocline was 1.71. The surface layer was dominated by Leptocylindrus danicus (8.92 x 106 cell m-3), Trichodesmium erythareum (5.83 x 106 cell m-3), and Detonula converfacea (0.62 x 106 cell m-3). The thermocline layer was dominated by Chaetoceros affinis (2.74 x 105 cell m-3), Thalassionema nitzchioides (2.21 x 105 cell m-3), and Chaertoceros dichaeta (1.38 x 105 cell m-3). The low phytoplankton abundance was found at the stations 12 and 13 caused by higher salinity concentration. The highest phytoplankton abundance was found in the stations with warmer temperatures, both in the surface and in the thermocline. The shallow depth thermocline layer (75-100 m) has a higher abundance than the deeper thermocline layer (110-150 m). Temperature was the environmental parameter that has the greatest influence on the abundance and species of phytoplankton, the phytoplankton in the surface layer reached 10 times more abundant than the thermocline layer.

scholarly journals Struktur komunitas fitoplankton dan kaitannya dengan ketersediaan zat hara dan parameter kualitas air lainnya di perairan Timur Surabaya

DEPIK ◽  
2015 ◽  
Vol 4 (2) ◽  
Author(s):  
Setya Indra Padma Putri ◽  
Syarifah Hikmah Julinda Sari
Keyword(s):  
Community Structure ◽  
Nutrient Availability ◽  
Coastal Waters ◽  
Diversity Index ◽  
Environmental Parameters ◽  
Phytoplankton Abundance ◽  
Environment Parameters ◽  
Relationship Of ◽  
The Relationship ◽  
Regression Correlation

<p><strong>Abstract. </strong>The objetives of the present research were to determine relationship of phytoplankton abundance and community structure with environmental factors.The research was conducted in twelve stations along East Surabaya’s Coastal Waters. The samplings were represented early dry season (May-July 2013). Regression Correlation Analisis and Principle Component Analysis were involved to determine the relationship between community structure of phytoplankton and nutrient availability as well as other environmental parameters. The results showed that the concentration of Nitrate (NO3-N) was ranged from 1.80mg/L to 7.31 mg/L while Phosphate (PO4-P) was 0.20 – 4.75 mg/L. The phytoplankton abundance was varied between 3300 cell/L to 47000 cell/L. The highest phytoplankton abundance was found in the estuary and deacreased toward the sea areas. The dDiversity and evennes indices were low category, while dominance index was found to be relatively high, where Skeletonema sp. was predominant. Diversity index was not correlated significantly with nutrient availability, while there were a significant correlation between phytoplankton abundance and environment parameters namely salinity, DO and brighness<br /><strong></strong></p><p><strong>Keywords :</strong> phytoplankton abundance; oseanography factor; spatial analysis; coastal waters</p><p><strong>Abstrak.</strong> Penelitian ini bertujuan untuk mengetahui keterkaitan antara kelimpahann dan struktur komunitas fitoplankton dengan faktor lingkungan di perairan pesisir. Penelitian dilakukan pada 12 stasiun berbeda di Perairan Timur Surabaya. Sampling plankton dan kualitas air mewakili awal musim kemarau (Mei – Juli 2013). Analisis regresi korelasi dan analisis komponen utama dilakukan untuk melihat keterkaitan struktur komunitas dan ketersedian zat hara dan parameter lingkungan lainnya di lokasi penelitian. Hasil penelitian menunjukkan kandungan zat hara yang relatif tinggi: Nitrat (NO3-N) antara 1,80 – 7,31 mg/L dan Fosfat (PO4-P) antara 0,20 – 4,75 mg/L. Distribusi fitoplankton bervariasi antara 3,3 – 4,7.103sel/L. Kelimpahan plankton paling tinggi didapat pada stasiun muara sungai dengan indikasi penurunan ke arah laut. Indeks keragaman jenis (H’) dan indeks keseragaman jenis (E) relatif rendah; sebaliknya indeks dominasi tinggi (D&gt;0,5) dengan didominasi oleh Skeletonema sp.. Indeks diversitas menunjukkan hubungan yang tidak bermakna dengan zat hara. Namun, kelimpahan fitoplankton berkorelasi secara signifikan dengan parameter salinitas, DO dan kecerahan.</p><p><br /><strong>Kata kunci :</strong>kelimpahan fitoplankton; faktor oseanografi; analisis spasial; perairan pesisir</p>

Phytoplankton abundance, community structure and nutrients in cultural areas of Daya Bay, South China Sea

2006 ◽  
Vol 62 (1-2) ◽  
pp. 85-94 ◽  
Author(s):  
Zhaohui Wang ◽  
Yuzao Qi ◽  
Jufeng Chen ◽  
Ning Xu ◽  
Yufeng Yang
Keyword(s):  
Community Structure ◽  
South China Sea ◽  
South China ◽  
Daya Bay ◽  
Phytoplankton Abundance ◽  
China Sea

scholarly journals Phytoplankton community structure in Lake Taiping of Anhui Province

2016 ◽  
Vol 28 (5) ◽  
pp. 1066-1077 ◽  
Author(s):  
XIONG Lian ◽  
◽  
LIU Dongyan ◽  
WANG Junli ◽  
WU Mingshu ◽  
...  
Keyword(s):  
Community Structure ◽  
Phytoplankton Community ◽  
Anhui Province ◽  
Phytoplankton Community Structure

scholarly journals Vertical stratification driven nutrient ratios to regulate phytoplankton community structure in the oligotrophic western Pacific Ocean

2021 ◽  
Author(s):  
Zhuo Chen ◽  
Jun Sun ◽  
Ting Gu ◽  
Guicheng Zhang ◽  
Yuqiu Wei
Keyword(s):  
Community Structure ◽  
Pacific Ocean ◽  
Vertical Distribution ◽  
Phytoplankton Community ◽  
Western Pacific ◽  
Vertical Stratification ◽  
Western Pacific Ocean ◽  
Phytoplankton Community Structure ◽  
Phytoplankton Abundance ◽  
The Vertical Distribution

Abstract. Vertical stratification determined the variability of temperature and nutrient distribution in upper seawater, thereby affecting the primary production of the ocean. Nutrients in the oligo-trophic region vary in time and space, and thus phytoplankton vary in their vertical distribution. However, the differences in the vertical distribution of phytoplankton have not been systematically studied. This study investigated the spatial distribution pattern and diversity of phytoplankton communities in the western Pacific Ocean (WPO) in the autumn of 2016, 2017 and 2018, as well as the local hydrological and nutritional status. The Utermöhl method was used to analyze the relevant ecological characteristics of phytoplankton in the surveyed sea area. In the three cruises investigated, we show universal relationships between phytoplankton and (1) vertical stratification, (2) N : P ratio (3) temperature and salinity. The potential influencing factors of physical and chemical parameters on phytoplankton abundance were analyzed by structural equation model (SEM), determining the vertical stratification index was the most important influence factor affecting phytoplankton abundance and indirectly on phytoplankton abundance by dissolved inorganic nitrogen (DIN) and Dissolved inorganic phosphorus (DIP). Vertical stratification determines the vertical distribution of the phytoplankton community structure in the WPO. The areas with strong vertical stratification (Group A and B) are more conducive to the growth of cyanobacteria, and the areas with weak vertical stratification (Group C and D) are more conducive to the bloom of diatoms and dinoflagellates.

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