Further studies of plankton ecosystems in the eastern Indian Ocean. III. Numerical abundance and biomass

1977 ◽  
Vol 28 (5) ◽  
pp. 557 ◽  
Author(s):  
DJ Tranter ◽  
JD Kerr
Keyword(s):  
Indian Ocean ◽  
Monsoon Season ◽  
Time Of Day ◽  
Eastern Indian Ocean ◽  
Fish Eggs ◽  
The South ◽  
North West ◽  
Numerical Abundance ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

The numerical abundance of 13 zooplankton taxa in the eastern Indian Ocean (meridian 110�E.) was examined in relation to some factors likely to control their distribution. Regression analysis showed that season, latitude (and their interaction), and time of day were frequently significant sources of variance. Decapoda, Amphipoda, fish eggs and larvae, Coelenterata and, sometimes, Copepoda and Euphausiacea were more abundant by night than by day. Numbers were generally high in late winter (June-September) and low in early summer, with a secondary peak, in some cases, in early autumn (March). Numbers were generally high at low latitudes (9-15�S.) and low at high latitudes (25-32�S.), one exception being fish eggs and larvae whose centre of abundance lay at 24-25�S. Seasonal periodicity was frequently in phase along the study section, numerical abundance reaching a peak 1-2 months after a general phytoplankton bloom at the onset of the south-east monsoon. There is no ready explanation why the subtropical regime should be in synchrony with that prevailing in the tropics, no subtropical source of nutrient enrichment being known which could match, for example, the Java Dome. An explanation for the observed tropical-subtropical synchrony was therefore sought in terms of interzonal advection. Data from a variety of sources showed that between May and August there was considerable enrichment not only at the Java Dome but also on the north-west Australian shelf. The area between North-West Cape and Port Hedland is the place where (plankton-feeding) humpback whales are known to gather. Sperm whales, on the other hand, congregate 1100-1300 km further to the south- west where the waters are rich in micronekton. The mass transport of upper waters during the south- east monsoon season suggests that these phenomena constitute a trophic sequence. The second zooplankton peak, in March, is the result of a summer algal bloom generated, perhaps, by remineralization of organic matter produced during the previous south-east monsoon season.

Chordata: Fish eggs and larvae

2017 ◽  
Author(s):  
Peter Munk ◽  
Jørgen G. Nielsen
Keyword(s):  
Life Cycle ◽  
Tree Of Life ◽  
Fish Eggs ◽  
General Morphology ◽  
Family Level ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

This chapter describes the taxonomy of fish eggs and larvae. Most fish eggs and larvae are planktonic, and are commonly found in plankton net tows. Collectively these fish stages are referred to as ichthyoplankton. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.

scholarly journals Determining seasonal dominant fish eggs and larvae species groups in the west of Tonkin Gulf

2021 ◽  
Vol 21 (2) ◽  
pp. 171-181
Author(s):  
Huy Pham Quoc ◽  
Minh Nguyen Hoang
Keyword(s):  
Dominant Species ◽  
Species Group ◽  
Fish Eggs ◽  
Time And Space ◽  
The West ◽  
Dominant Fish ◽  
Gulf Of Tonkin ◽  
Species Groups ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

From 2003 to 2016, 1,649 samples were collected, covering both the time and space of the Gulf of Tonkin. The results have identified groups of seasonal dominant fish eggs and larvae: Seven species groups in Spring, nine species groups in the Summer, six species groups in Autumn, and four dominant species groups in the Winter. The dominant index (Yi) ranges from 0.02 to 0.26 depending on the species group and each season of the year, the highest in the Goby group - Gobiidae (Yi = 0.26) achieved in the Spring, followed by Herringgroup - Clupeidae reaches Yi = 0.20 in the Summer and the Anchovy group - Engraulidae reaches Yi = 0.16 in the Summer. The highest advantage index is only Yi = 0.09 in the Winter for Unicorn cod species - Bregmaceros macclelandi. During this period, the number of taxa and dominant indexes tended to decrease from Spring to Winter slightly.

scholarly journals Natural diet and predation impacts ofPelagia noctilucaon fish eggs and larvae in the NW Mediterranean

2016 ◽  
Vol 38 (5) ◽  
pp. 1243-1254 ◽  
Author(s):  
Uxue Tilves ◽  
Jennifer E. Purcell ◽  
Verónica L. Fuentes ◽  
Anna Torrents ◽  
Maria Pascual ◽  
...  
Keyword(s):  
Fish Eggs ◽  
Natural Diet ◽  
Nw Mediterranean ◽  
Eggs And Larvae ◽  
Fish Eggs And Larvae

scholarly journals Molecular and spatial distributions of dicarboxylic acids, oxocarboxylic acids, and <i>α</i>-dicarbonyls in marine aerosols from the South China Sea to the eastern Indian Ocean

2020 ◽  
Vol 20 (11) ◽  
pp. 6841-6860 ◽  
Author(s):  
Jing Yang ◽  
Wanyu Zhao ◽  
Lianfang Wei ◽  
Qiang Zhang ◽  
Yue Zhao ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Indian Ocean ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Photochemical Oxidation ◽  
Eastern Indian Ocean ◽  
The South ◽  
China Sea ◽  
Mass Ratios

Abstract. Marine aerosol samples collected from the South China Sea (SCS) to the eastern Indian Ocean (EIO) during a cruise from 10 March to 26 April 2015 were studied for diacids and related compounds. In view of air mass backward trajectories, source regions, and geographical features, the cruise area was categorized into the South China Sea (SCS), the eastern Indian Ocean off the coast of western Indonesia (EIO-WI), the EIO off the coast of Sri Lanka (EIO-SL), Malacca, and the Sri Lanka docking point (SLDP). Total concentrations of diacids, oxoacids, and α-dicarbonyls were high at the SLDP, followed by the SCS and Malacca, and they were the low in the EIO-WI. In this study, oxalic acid (C2) was the dominant diacid during the cruise, followed by malonic acid (C3) in the SCS, EIO-WI, EIO-SL, and Malacca, and succinic acid (C4) was relatively more abundant than C3 diacid at the SLDP. Except for SLDP, C3∕C4 mass ratios were always greater than 1, and no significant difference was observed during the cruise. The C2∕C4 and C2∕total diacid ratios also showed similar trends. The average mass ratios of adipic acid (C6) to azelaic acid (C9) were less than unity except for in the EIO-WI; the mass ratios of phthalic acid (Ph) to azelaic acid (C9) were less than 2 except for in the SCS. The concentrations of diacids were higher when the air masses originated from terrestrial regions than when they originated from remote oceanic regions. Based on the molecular distributions of organic acids, the mass ratios, and the linear correlations of selected compounds in each area, we found that the oxidation of biogenic volatile organic compounds (BVOCs) released from the ocean surface and subsequent in situ photochemical oxidation was the main contributor to diacids, oxocarboxylic acids, and α-dicarbonyls from the SCS to the EIO. In addition, the continental outflow, which is enriched in anthropogenic VOCs and their aged products, influenced the organic aerosol loading, particularly over the SCS. Emissions from Sri Lanka terrestrial vegetation as well as fossil fuel combustion and subsequent photochemical oxidation also played a prominent role in controlling the organic aerosol loading and the molecular distribution of diacids and related compounds at the SLDP.

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