Spatial and temporal variability in the vertical distribution of gastropods on the rocky shores along the east coast of South Andaman Island, India

2018 ◽  
Vol 49 (2) ◽  
pp. 633-645 ◽  
Author(s):  
Vikas Pandey ◽  
Ganesh Thiruchitrambalam
Keyword(s):  
Vertical Distribution ◽  
Temporal Variability ◽  
East Coast ◽  
Spatial And Temporal Variability ◽  
Rocky Shores ◽  
Andaman Island ◽  
South Andaman ◽  
The Vertical Distribution

scholarly journals Links between East Coast Lows and the spatial and temporal variability of rainfall along the eastern seaboard of Australia

2016 ◽  
Vol 66 (2) ◽  
pp. 162
Author(s):  
Anthony S. Kiem ◽  
Callum Twomey ◽  
Natalie Lockart ◽  
Garry Willgoose ◽  
George Kuczera ◽  
...  
Keyword(s):  
Temporal Variability ◽  
East Coast ◽  
Water Security ◽  
Rainfall Simulation ◽  
Spatial And Temporal Variability ◽  
Drought Risk ◽  
Urban Water ◽  
Catchment Scale ◽  
Duration Magnitude ◽  
Eastern Seaboard

East Coast Lows (ECLs) are intense low-pressure systems which occur over the subtropical east coasts of southern and northern hemisphere continents. ECLs are typically associated with gale force winds, large seas, storm surges, heavy rainfall and flooding. While ECL impacts are typically seen as negative the rainfall associated with ECLs is also very important for urban water security within the heavily populated eastern seaboard of Australia (ESA). This study investigates historical ECLs to gain insights into the timing, frequency, intensity and location of ECL occurrence as well as the magnitude and spatial extent of ECL impacts on rainfall. The different characteristics and impacts associated with different ECL sub-types are highlighted and it is proposed that this spatial and temporal variability in ECL behaviour at least partially explains why the ESA is hydroclimatically different to the rest of Australia and why different locations within the ESA have such different rainfall patterns—and therefore different levels of flood and drought risk. The-se insights are critical to the objectives of the New South Wales government funded Eastern Seaboard Climate Change Initiative (ESCCI), in particular Project 5 which focuses on the water security impacts of ECLs. The results of this work will be used to produce climate-informed stochastic daily rainfall simulations that are more realistic than existing stochastic rainfall simulation methods at preserving the statistics important for catchment-scale hydrology (e.g. clustering of extreme events, long-term persistence, frequency/duration/magnitude of wet and dry spells). These simulated rainfall sequences, that incorporate the spatial and temporal hydroclimatic variability caused by ECLs and other climate phenomena, are important inputs into the hydrological models used to determine current and future urban water security within the ESA.

scholarly journals Spatial and temporal variability of aerobic anoxygenic photoheterotrophic bacteria along the east coast of Australia

2016 ◽  
Vol 18 (12) ◽  
pp. 4485-4500 ◽  
Author(s):  
Jaime Bibiloni-Isaksson ◽  
Justin R. Seymour ◽  
Tim Ingleton ◽  
Jodie van de Kamp ◽  
Levente Bodrossy ◽  
...  
Keyword(s):  
Temporal Variability ◽  
East Coast ◽  
Spatial And Temporal Variability

scholarly journals Links between East Coast Lows and the spatial and temporal variability of rainfall along the eastern seaboard of Australia

2016 ◽  
Vol 66 (2) ◽  
pp. 162-176 ◽  
Author(s):  
Anthony S. Kiem ◽  
◽  
Callum Twomey ◽  
Natalie Lockart ◽  
Garry Willgoose ◽  
...  
Keyword(s):  
Temporal Variability ◽  
East Coast ◽  
Spatial And Temporal Variability ◽  
Eastern Seaboard

scholarly journals Modeling characterization of the vertical and temporal variability of environmental DNA in the mesopelagic ocean

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Elizabeth Andruszkiewicz Allan ◽  
Michelle H. DiBenedetto ◽  
Andone C. Lavery ◽  
Annette F. Govindarajan ◽  
Weifeng G. Zhang
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Temporal Variability ◽  
Mechanistic Model ◽  
Temporal Distribution ◽  
Environmental Dna ◽  
Vertical Displacement ◽  
Physical Parameters ◽  
Spatial And Temporal Variability ◽  
The Impact

AbstractIncreasingly, researchers are using innovative methods to census marine life, including identification of environmental DNA (eDNA) left behind by organisms in the water column. However, little is understood about how eDNA is distributed in the ocean, given that organisms are mobile and that physical and biological processes can transport eDNA after release from a host. Particularly in the vast mesopelagic ocean where many species vertically migrate hundreds of meters diurnally, it is important to link the location at which eDNA was shed by a host organism to the location at which eDNA was collected in a water sample. Here, we present a one-dimensional mechanistic model to simulate the eDNA vertical distribution after its release and to compare the impact of key biological and physical parameters on the eDNA vertical and temporal distribution. The modeled vertical eDNA profiles allow us to quantify spatial and temporal variability in eDNA concentration and to identify the most important parameters to consider when interpreting eDNA signals. We find that the vertical displacement by advection, dispersion, and settling has limited influence on the eDNA distribution, and the depth at which eDNA is found is generally within tens of meters of the depth at which the eDNA was originally shed from the organism. Thus, using information about representative vertical migration patterns, eDNA concentration variability can be used to answer ecological questions about migrating organisms such as what depths species can be found in the daytime and nighttime and what percentage of individuals within a species diurnally migrate. These findings are critical both to advance the understanding of the vertical distribution of eDNA in the water column and to link eDNA detection to organism presence in the mesopelagic ocean as well as other aquatic environments.

Some factors affecting the respiration of intertidal Asterina gibbosa (Echinodermata: Asteroidea)

1987 ◽  
Vol 67 (4) ◽  
pp. 717-727 ◽  
Author(s):  
Christine T. Murphy ◽  
M. B. Jones
Keyword(s):  
Vertical Distribution ◽  
Neap Tide ◽  
High Water ◽  
Rocky Shores ◽  
Rock Pools ◽  
Factors Affecting ◽  
Upper Limits ◽  
The Mean ◽  
The Vertical Distribution ◽  
Inadequate Food Supply

In Britain, the cushion star Asterina gibbosa Pennant 1897 (Echinodermata, Asteroidea) is confined to the west coast, where it occurs on rocky shores, often sympatrically with the closely related Asterina phylactica Emson & Crump 1979 (Crump & Emson, 1983; Emson & Crump, 1984). The vertical distribution of A. gibbosa extends from about 100 m depth, into the intertidal; however, littoral cushion stars occupy rock pools and relatively damp habitats such as gulley walls, crevices, overhangs and the underside of boulders, generally on the lower shore (Emson, 1979). On shores with rock pools, cushion stars may extend their upper limits of vertical distribution but not beyond the mean high-water neap-tide level (Crump & Emson, 1978). Absence of A. gibbosa from higher shore levels has been related to intolerance to desiccation and high temperature, inadequate food supply, and complex behavioural responses to gravity and light (Crozier, 1935; Emson, 1979; Crump & Emson, 1983). Prior to the present study, it has not been possible to discuss the influence of respiratory requirements on the vertical distribution of this species.

scholarly journals The vertical distribution and abundance of Chthamalus stellatus Poli and Chthamalus montagui Southward (Crustacea, Cirripedia) at two localities of the Istrian peninsula coast (North Adriatic)

2017 ◽  
Vol 58 (1) ◽  
pp. 77-88
Author(s):  
Nataša Dolenc-Orbanić ◽  
Claudio Battelli
Keyword(s):  
Vertical Distribution ◽  
Adriatic Sea ◽  
Spatial Scales ◽  
Tidal Range ◽  
Rocky Shores ◽  
Tidal Level ◽  
The North ◽  
Chthamalus Montagui ◽  
The Vertical Distribution ◽  
North Adriatic Sea

Two species of chthamalid barnacles are well established from the upper to the lower limit of the midlittoral zone on the rocky shores of the North Adriatic Sea: Chthamalus stellatus, Poli and Chthamalus montagui, Southward. The present study deals with the vertical distribution and abundance for each species at two localities of the Istrian peninsula coast (North Adriatic Sea). For this purpose chthamalid populations were monitored in 2015 along the Slovenian marine coast (Bay of Koper, Gulf of Trieste) and along the Croatian marine coast, near Rovinj (west Istrian coast), both on limestone. The main aim of the study was to establish if there was a relationship between the vertical distribution and abundance of these two species at different spatial scales: small (between sites, about 1 kilometer) and large (between localities, 10s of kilometers). The selected localities are slightly different in tidal range, in orientation and wave exposure. Three sites were randomly selected at each locality and two transects per tidal level (upper, middle and lower) were chosen on each site. The abundance of each chthamalids species in 1 dm2 plots was determined at three different tidal levels along each transect. The results indicated that the vertical distribution of C. montagui and C. stellatus was very similar between localities and even among sites, but their abundance varied. At both localities, C. montagui was more abundant in the upper and middle tidal levels, while C. stellatus was more abundant at the lower tidal level. It was also found that C. montagui was more abundant in sheltered conditions (Bay of Koper), while C. stellatus on the coast more exposed to the wave action (near Rovinj), at all tidal levels.

scholarly journals Measuring the vertical distributional variability of pelagic fauna in Monterey Bay

2012 ◽  
Vol 69 (2) ◽  
pp. 184-196 ◽  
Author(s):  
Samuel S. Urmy ◽  
John K. Horne ◽  
David H. Barbee
Keyword(s):  
Vertical Distribution ◽  
Temporal Variability ◽  
Signal Frequency ◽  
Late Winter ◽  
Monterey Bay ◽  
Analysis Techniques ◽  
Long Time ◽  
Autumn And Winter ◽  
The Vertical Distribution ◽  
Image Analysis Techniques

Abstract Urmy, S. S., Horne, J. K., and Barbee, D. H. 2012. Measuring the vertical distributional variability of pelagic fauna in Monterey Bay. – ICES Journal of Marine Science, 69: 184–196. Temporal variability is an important feature of aquatic ecosystems that can be difficult to measure. A stationary, upward-facing scientific echosounder was used to record the vertical distribution of pelagic fauna in Monterey Bay, CA, for 18 months. To characterize the distributions, a suite of metrics, including measures of density, abundance, location, dispersion, occupancy, evenness, and aggregation, was developed and tested. An algorithm to detect and count the number of acoustic backscatter layers was developed using image-analysis techniques. The metrics recorded a strong seasonal cycle, with total backscatter reaching a minimum during the spring upwelling season and peaking in autumn and winter. Variability in the vertical distribution of animals was greatest at long time-scales and decreased as a power (−1.050 to −1.585) of signal frequency. There were significant peaks in the power spectrum at 12- and 24-h periods, corresponding to the semi-diurnal tide and diel vertical migration. The diel signal was strongest in late winter and weakest during the spring upwelling season. Active acoustics are a useful addition to ocean observatories, and the metrics presented provide a useful set of tools to quantify the distribution and temporal variability of pelagic fauna.

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