Ouachita Madtom (Noturus lachneri) Metapopulation Dynamics in Intermittent Ouachita Mountain Streams

The northern Shikoku region is located in the Western part of Japan and faces towards the Seto Inland Sea. The forest area, which is one of the non-point sources in the Seto Inland Sea watershed, occupies 75% of the land use in the watershed of the northern Shikoku region. The amount of loadings of nutrients and COD in the Seto Inland Sea has been estimated by the unit load method but actually the data has not been investigated. It is however, necessary to know the real concentration of nitrogen in mountain streams to evaluate the role which is the mountain area plays as non-point sources. Therefore, more water samples of mountain streams in the watershed need to be taken and the concentrations of nitrogen analyzed. The mountain streams in the northern Shikoku area were investigated from April, 2015 to November, 2015. The number of sampling sites was 283, in addition to the past data by Kunimatsu et al. The average concentration of nitrate nitrogen in Ehime, Kagawa, and Tokushima was 0.61mg/L, 0.78mg/L and 0.34mg/L, respectively. The environmental standard range for nitrogen in the Seto Inland Sea is from between less than 0.2mg/L and less than 1mg/L. Therefore, the average concentration of nitrogen in these regions was over category II, and those of mountain streams in Kagawa Prefecture exceeded category III. About 20% of mountain streams were more than 1mg/L. It has become clear that mountain areas occupy an important position as non-point sources for the Seto Inland Sea.

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Allee Effects in Metapopulation Dynamics

The American Naturalist ◽

10.2307/2463492 ◽

1998 ◽

Vol 152 (2) ◽

pp. 298

Author(s):

Amarasekare

Keyword(s):

Metapopulation Dynamics ◽

Allee Effects

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Metapopulation Patterns of Iberian Butterflies Revealed by Fuzzy Logic

Insects ◽

10.3390/insects12050392 ◽

2021 ◽

Vol 12 (5) ◽

pp. 392

Author(s):

Antonio Pulido-Pastor ◽

Ana Luz Márquez ◽

José Carlos Guerrero ◽

Enrique García-Barros ◽

Raimundo Real

Keyword(s):

Fuzzy Logic ◽

Set Theory ◽

Fuzzy Set Theory ◽

Metapopulation Dynamics ◽

Butterfly Species ◽

Dynamics Analysis ◽

Metapopulation Structure ◽

Occurrence Data ◽

Metapopulation Theory ◽

The Cost

Metapopulation theory considers that the populations of many species are fragmented into patches connected by the migration of individuals through an interterritorial matrix. We applied fuzzy set theory and environmental favorability (F) functions to reveal the metapopulational structure of the 222 butterfly species in the Iberian Peninsula. We used the sets of contiguous grid cells with high favorability (F ≥ 0.8), to identify the favorable patches for each species. We superimposed the known occurrence data to reveal the occupied and empty favorable patches, as unoccupied patches are functional in a metapopulation dynamics analysis. We analyzed the connectivity between patches of each metapopulation by focusing on the territory of intermediate and low favorability for the species (F < 0.8). The friction that each cell opposes to the passage of individuals was computed as 1-F. We used the r.cost function of QGIS to calculate the cost of reaching each cell from a favorable patch. The inverse of the cost was computed as connectivity. Only 126 species can be considered to have a metapopulation structure. These metapopulation structures are part of the dark biodiversity of butterflies because their identification is not evident from the observation of the occurrence data but was revealed using favorability functions.

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Detecting seed bank influence on plant metapopulation dynamics

Methods in Ecology and Evolution ◽

10.1111/2041-210x.13547 ◽

2021 ◽

Author(s):

Apolline Louvet ◽

Nathalie Machon ◽

Jean‐Baptiste Mihoub ◽

Alexandre Robert

Keyword(s):

Seed Bank ◽

Metapopulation Dynamics

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Variability of Bed Load Transport During Six Summers of Continuous Measurements in Two Austrian Mountain Streams (Fischbach and Ruetz)

Water Resources Research ◽

10.1002/2017wr021376 ◽

2018 ◽

Vol 54 (1) ◽

pp. 107-131 ◽

Cited By ~ 11

Author(s):

Dieter Rickenmann

Keyword(s):

Mountain Streams ◽

Bed Load ◽

Continuous Measurements ◽

Load Transport ◽

Bed Load Transport

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Studies on mountain streams in the English Lake District.

Freshwater Biology ◽

10.1111/j.1365-2427.1973.tb00933.x ◽

1973 ◽

Vol 3 (5) ◽

pp. 437-462 ◽

Cited By ~ 176

Author(s):

D.W. SUTCLIFFE ◽

T. R. CARRICK

Keyword(s):

Mountain Streams ◽

Lake District ◽

English Lake District

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New Zealand translocations: theory and practice

Pacific Conservation Biology ◽

10.1071/pc950039 ◽

1995 ◽

Vol 2 (1) ◽

pp. 39 ◽

Cited By ~ 65

Author(s):

Doug P. Armstong ◽

Ian G. McLean

Keyword(s):

Population Dynamics ◽

New Zealand ◽

Experimental Tests ◽

Theory And Practice ◽

Habitat Requirements ◽

Metapopulation Dynamics ◽

Behavioural Adaptation ◽

New Locations ◽

History Of ◽

Tests Of Hypotheses

One of the most common tools in New Zealand conservation is to translocate species to new locations. There have now been over 400 translocations done for conservation reasons, mainly involving terrestrial birds. Most translocations have been done strictly as management exercises, with little or no reference to theory. Nevertheless, translocations always involve some underlying theory, given that people must inevitably choose among a range of potential translocation strategies. We review theory relevant to translocations in the following areas: habitat requirements, susceptibility to predation, behavioural adaptation, population dynamics, genetics, metapopulation dynamics, and community ecology. For each area we review and evaluate the models that seem to underpin translocation strategies used in New Zealand. We report experiments testing some of these models, but note that theory underlying translocation strategies is largely untested despite a long history of translocations. We conclude by suggesting key areas for research, both theoretical and empirical. We particularly recommend that translocations be designed as experimental tests of hypotheses whenever possible.

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