Patch dynamics driven by wave exposure in subtidal temperate seaweeds is exacerbated by warming oceans

2022 ◽  
Author(s):  
Y Mulders ◽  
L Mattio ◽  
JC Phillips ◽  
PS Lavery ◽  
GA Kendrick ◽  
...  
Keyword(s):  
Patch Dynamics ◽  
Wave Exposure

Seaweed traits linked to wave exposure determine predator avoidance

2013 ◽  
Vol 483 ◽  
pp. 143-151 ◽  
Author(s):  
JD Long ◽  
L Porturas ◽  
E Jones ◽  
C Kwan ◽  
GC Trussell
Keyword(s):  
Predator Avoidance ◽  
Wave Exposure

Pengaruh Variasi Waktu Paparan Gelombang Ultrasonik dalam Mengurangi Jumlah Bakteri coliform pada Sampel Air Sungai Kahayan

2020 ◽  
Vol 4 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Neny Kurniawati, Kerelius, Sunariyati ◽  
Luqman Hakim, Dyah Ayu Pramoda Wardani, Widya Krestina ◽  
Dwi Tyas Setiawan, Ferry Purwanto, Diah K. Fatmala
Keyword(s):  
Water Treatment ◽  
River Water ◽  
Ultrasonic Wave ◽  
Exposure Time ◽  
Water Samples ◽  
Sampling Technique ◽  
Wave Exposure ◽  
Test Results ◽  
Time Data ◽  
Grab Sampling

Abstrak – Penelitian ini bertujuan untuk mengkaji pengaruh waktu paparan gelombang ultrasonik terhadap pengurangan jumlah koloni bakteri coliform pada sampel air sungai Kahayan. Pengambilan sampel air sungai dilakukan dengan teknik Grab Sampling menggunakan alat Kemmerer Sampler. Sampel air yang didapatkan diberikan paparan gelombang ultrasonik secara langsung, tanpa merubah kondisi lingkungan awal. Waktu paparan divariasikan pada 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam dengan frekuensi 40 kHz untuk memperoleh data waktu optimum. Uji coliform dilakukan dengan metode MPN, dengan tahapan uji pendugaan, uji penegasan, dan perhitungan koloni. Hasil uji MPN 24 jam setelah paparan menunjukkan bahwa penggunaan ultrasonik sebagai antibateri dapat optimum ketika diberikan paparan dengan waktu 3 jam, dengan efisiensi  96%. Kata kunci: antibakteri, coliform, ultrasonik, water treatment, sungai Kahayan  Abstract – This study aims to examine the effect of ultrasonic wave exposure time on reducing the number of coliform bacterial colonies in the Kahayan river water samples. River water sampling is done using the Grab Sampling technique using the Kemmerer Sampler tool. The water samples obtained were given direct ultrasonic wave exposure, without changing the initial environmental conditions. The exposure time is varied in 1 hour, 2 hours, 3 hours, 4 hours and 5 hours with a frequency of 40 kHz to obtain optimum time data. Coliform test was carried out by the MPN method, with the stages of the estimation test, affirmation test, and colony calculation. The MPN test results 24 hours after exposure showed that the use of ultrasonic as an antibody can be optimum when given exposure with a time of 3 hours, with an efficiency of 96%.Keywords : antibakterial, coliform, ultrasonic, water treatment, Kahayan river

scholarly journals A stochastic model of epilithic algal succession and patch dynamics in streams

Ecosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
Author(s):  
Dean M. DeNicola ◽  
James N. McNair ◽  
Jiyeon Suh
Keyword(s):  
Stochastic Model ◽  
Patch Dynamics ◽  
Algal Succession

scholarly journals Colonization-extinction and patch dynamics of the perennial riparian plant, Silene tatarica

2005 ◽  
Vol 93 (4) ◽  
pp. 670-680 ◽  
Author(s):  
ANNE JÄKÄLÄNIEMI ◽  
JUHA TUOMI ◽  
PIRKKO SIIKAMÄKI ◽  
ANNA KILPIÄ
Keyword(s):  
Patch Dynamics ◽  
Silene Tatarica ◽  
Riparian Plant

scholarly journals Stability analysis of the coexistence equilibrium of a balanced metapopulation model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shodhan Rao ◽  
Nathan Muyinda ◽  
Bernard De Baets
Keyword(s):  
Equilibrium Point ◽  
Mathematical Proof ◽  
Mean Field ◽  
Patch Dynamics ◽  
System Modelling ◽  
Metapopulation Model ◽  
Ode System ◽  
Homogeneous Network ◽  
The Stability ◽  
Coexistence Equilibrium

AbstractWe analyze the stability of a unique coexistence equilibrium point of a system of ordinary differential equations (ODE system) modelling the dynamics of a metapopulation, more specifically, a set of local populations inhabiting discrete habitat patches that are connected to one another through dispersal or migration. We assume that the inter-patch migrations are detailed balanced and that the patches are identical with intra-patch dynamics governed by a mean-field ODE system with a coexistence equilibrium. By making use of an appropriate Lyapunov function coupled with LaSalle’s invariance principle, we are able to show that the coexistence equilibrium point within each patch is locally asymptotically stable if the inter-patch dispersal network is heterogeneous, whereas it is neutrally stable in the case of a homogeneous network. These results provide a mathematical proof confirming the existing numerical simulations and broaden the range of networks for which they are valid.

Patch history, invertebrate patch dynamics and heterogeneous community composition: perspectives from a manipulative stream experiment

2007 ◽  
Vol 58 (4) ◽  
pp. 307 ◽  
Author(s):  
D. A. Olsen ◽  
C. D. Matthaei ◽  
C. R. Townsend
Keyword(s):  
Community Composition ◽  
Patch Dynamics ◽  
Invertebrate Drift ◽  
Macroinvertebrate Communities ◽  
Disturbance History ◽  
Patch Type ◽  
Entire Study ◽  
Stream Communities ◽  
Different Types ◽  
Stable Control

Recent research after bed-moving flow events has shown that local disturbance history can contribute to patchiness in stream communities. Patterns of recolonisation were studied following experimental disturbances in which patches of sediment were manipulated by removing 10 cm of surface sediment (scour) or by depositing 10 cm of clean sediment (fill) on top of existing sediments. Six invertebrate samples were collected from each patch type (including stable control patches) on five occasions up to six weeks after the manipulation. Immediately after the disturbance, distinctive macroinvertebrate communities occurred in scour, fill and stable patches. Community composition in scour patches remained distinct from fill and stable patches for the entire study period. Immediately after the manipulation, scour patches contained higher densities of hypogean taxa than did fill patches, but this difference did not persist for long, indicating that the relict community had little influence on the subsequent pattern of recovery. In contrast, fill patch communities were indistinguishable from stable patches by Day 14, most likely owing to recolonisation by buried invertebrates and invertebrate drift. Differences in patterns of recolonisation following different types of disturbance can result in patchy invertebrate communities that persist for several weeks after the disturbance.

scholarly journals Patch Dynamics Inform Management Decisions in a Threatened Frog Species

Copeia ◽  
2017 ◽  
Vol 105 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Michael J. Lannoo ◽  
Rochelle M. Stiles ◽  
Michael A. Sisson ◽  
Jonathan W. Swan ◽  
Vanessa C. K. Terrell ◽  
...  
Keyword(s):  
Patch Dynamics ◽  
Management Decisions ◽  
Frog Species
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