Within-day and seasonal patterns of microphytobenthos biomass determined by co-measurement of sediment and water column chlorophylls in the intertidal mudflat of Nanaura, Saga, Ariake Sea, Japan

2007 ◽  
Vol 72 (1-2) ◽  
pp. 42-52 ◽  
Author(s):  
Chul-Hwan Koh ◽  
Jong Seong Khim ◽  
Hiroyuki Araki ◽  
Hiroyuki Yamanishi ◽  
Kenichi Koga
Keyword(s):  
Water Column ◽  
Seasonal Patterns ◽  
Intertidal Mudflat ◽  
Ariake Sea

Dispersal of Atlantic salmon fry from a natural redd: evidence for undergravel movements?

1993 ◽  
Vol 71 (7) ◽  
pp. 1454-1457 ◽  
Author(s):  
Carlos Garcia de Leaniz ◽  
Neil Fraser ◽  
Felicity Huntingford
Keyword(s):  
Atlantic Salmon ◽  
Water Column ◽  
Salmo Salar ◽  
Seasonal Patterns ◽  
Salmon Fry

In this paper we describe a modified version of a box trap used for bank-to-bank trapping during a study of dispersal of Atlantic salmon fry (Salmo salar L.). Two such traps were positioned 2 m upstream and downstream of a single isolated natural redd and a third was placed 20 m downstream. All fry captured in each trap were marked and released beyond the trap. Of the fish caught in the second downstream trap, 64% were unmarked. The seasonal patterns of trapping for marked and unmarked fish were identical, but the unmarked fish were significantly smaller than their marked peers. We argue that these unmarked captures represent fish that evaded capture in the first downstream trap, either by dispersing from the redd deep within the gravel or by leaving the water column and burrowing into the gravel on encountering the trap. Implications for the interpretation of trapping data on newly emerged salmonids are discussed.

Effect of an Intertidal Mudflat on Plankton of the Overlying Water Column

1984 ◽  
Vol 41 (10) ◽  
pp. 1523-1528 ◽  
Author(s):  
David J. Carlson ◽  
David W. Townsend ◽  
Alan L. Hilyard ◽  
Jonathan F. Eaton
Keyword(s):  
Water Column ◽  
Seasonal Pattern ◽  
Intertidal Mudflat ◽  
Overlying Water ◽  
Filter Feeders

The influence of a small tidal mudflat on the plankton of overlying waters was investigated by sampling flooding and ebbing waters. The mudflat depleted floodwaters of plankton during spring and summer. Removals of phytoplankton increased as the season progressed, indicating consumption as a function of activity of benthic filter feeders. Some zooplankton were removed from flooding waters in a similar seasonal pattern. We have demonstrated input of planktonic carbon to mudflats and indicated that mudflat organisms may consume significant portions of both primary and secondary planktonic production.

scholarly journals Seasonal patterns of benthic-pelagic coupling in oyster habitats

2020 ◽  
Vol 652 ◽  
pp. 95-109
Author(s):  
NE Ray ◽  
RW Fulweiler
Keyword(s):  
Nitrogen Cycling ◽  
Water Column ◽  
Rhode Island ◽  
Seasonal Patterns ◽  
Oyster Reefs ◽  
Reef Restoration ◽  
Suspended Particulates ◽  
Net Zero ◽  
Benthic Pelagic Coupling ◽  
The Impact

Oysters enhance benthic-pelagic coupling in coastal systems by moving large quantities of suspended particulates to the sediments, stimulating biogeochemical processes. Recent research efforts have focused on quantifying the impact of oysters on coastal biogeochemical cycling, yet there is little consensus on how oysters influence processes across systems. A potential driver of this variance is availability of organic material suspended in the water column and subsequent loading to sediment by oysters. Here, we measured fluxes of sediment di-nitrogen (N2-N), ammonium (NH4+), combined nitrate-nitrite (NOx), and phosphate (PO43-) in spring, summer, and fall at 2 oyster reefs and 1 farm in a temperate estuary (Narragansett Bay, Rhode Island). We then linked these fluxes with patterns of water column primary production. Nitrogen removal from the system was highest in spring, when we detected net sediment denitrification (48.8 µmol N2-N m-2 h-1) following a winter-spring diatom bloom. In contrast, we measured sediment N2 fixation in fall (-44.8 µmol N2-N m-2 h-1) at rates nearly equivalent to spring denitrification. In the summer, we measured a nearly net zero sediment N2-N flux (-2.7 µmol N2-N m-2 h-1). Recycling of nitrogen to the water column was consistent across seasons, composed almost exclusively of NH4+. These results demonstrate that sediment nitrogen cycling in oyster habitats is dynamic and can change rapidly based on seasonal patterns of productivity. At carrying capacity, the impact of oysters on nitrogen cycling is large and should be considered during efforts to increase oyster populations through aquaculture or reef restoration.

Seasonal Variation of Suicide in the City of São Paulo, Brazil, 1996–2010

Crisis ◽  
2014 ◽  
Vol 35 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Daniel Hideki Bando ◽  
Fernando Madalena Volpe
Keyword(s):  
Seasonal Pattern ◽  
Total Sample ◽  
Sao Paulo ◽  
Seasonal Patterns ◽  
São Paulo ◽  
Health Statistics ◽  
Males And Females ◽  
June July ◽  
The City ◽  
Over Time

Background: In light of the few reports from intertropical latitudes and their conflicting results, we aimed to replicate and update the investigation of seasonal patterns of suicide occurrences in the city of São Paulo, Brazil. Methods: Data relating to male and female suicides were extracted from the Mortality Information Enhancement Program (PRO-AIM), the official health statistics of the municipality of São Paulo. Seasonality was assessed by studying distribution of suicides over time using cosinor analyses. Results: There were 6,916 registered suicides (76.7% men), with an average of 39.0 ± 7.0 observed suicides per month. For the total sample and for both sexes, cosinor analysis estimated a significant seasonal pattern. For the total sample and for males suicide peaked in November (late spring) with a trough in May–June (late autumn). For females, the estimated peak occurred in January, and the trough in June–July. Conclusions: A seasonal pattern of suicides was found for both males and females, peaking in spring/summer and dipping in fall/winter. The scarcity of reports from intertropical latitudes warrants promoting more studies in this area.

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