Disturbance Ecology and Habitat Dynamics

2015 ◽  
pp. 96-109
Keyword(s):  
Disturbance Ecology ◽  
Habitat Dynamics

scholarly journals Seasonal flooding, instream habitat structure and fish assemblages in the Mulgrave River, north-east Queensland: towards a new conceptual framework for understanding fish-habitat dynamics in small tropical rivers

2008 ◽  
Vol 59 (2) ◽  
pp. 97 ◽  
Author(s):  
Thomas S. Rayner ◽  
Bradley J. Pusey ◽  
Richard G. Pearson
Keyword(s):  
Habitat Structure ◽  
Fish Assemblages ◽  
Fish Habitat ◽  
Dry Season ◽  
Assemblage Structure ◽  
Tropical Rivers ◽  
Wet Season ◽  
Seasonal Flooding ◽  
North East ◽  
Habitat Dynamics

Strong relationships between seasonal flooding, instream habitat structure and fish assemblages have been well documented in large tropical rivers (e.g. the flood pulse concept). However, the mechanics of these relationships are likely to differ substantially in smaller coastal rivers, such as those in Costa Rica, south-east Brazil and Australia’s Wet Tropics. These systems typically feature steep upland streams with short, deeply incised lowland channels and poorly connected floodplains. This hypothesis was investigated by documenting spatial and temporal variation in fish-habitat relationships in the Mulgrave River, north-east Queensland. Sampling was conducted at four lowland sites under a range of flow conditions, from dry-season baseflows to a one-in-ten-year flood. Longitudinal environmental gradients and fine-scale habitat patches were important in regulating fish assemblage structure during the dry season. However, high wet-season flows, constrained by the deep channel, acted as disturbances rather than gentle flood-pulses. In particular, the mobilisation of bed sediments led to scouring of aquatic vegetation and a dramatic reduction in habitat heterogeneity. Seasonal movements of fish led to significant changes in assemblage structure – from a community dominated by Neosilurus ater, Hypseleotris compressa, Awaous acritosus and Redigobius bikolanus during the dry season, to one dominated by Nematalosa erebi, Ambassis agrammus and Glossamia aprion during the wet season. Based on these observations, together with information from the literature, a conceptual model of fish-habitat dynamics is presented that is better suited to small tropical rivers than those developed in larger systems with expansive floodplains.

Modeling approach to simulate habitat dynamics

2006 ◽  
Author(s):  
M Noack ◽  
A Eisner ◽  
S Wieprecht
Keyword(s):  
Modeling Approach ◽  
Habitat Dynamics

Avifauna conservation and disturbance ecology in a coastal freshwater lagoon

2018 ◽  
Vol 190 (10) ◽  
Author(s):  
Tiago Cruz ◽  
Joana Lima ◽  
António Luís ◽  
Ulisses Miranda Azeiteiro
Keyword(s):  
Disturbance Ecology

To Hide or Not to Hide: Nesting Habitat Dynamics in a Threatened Gull

Waterbirds ◽  
2021 ◽  
Vol 43 (2) ◽  
Author(s):  
Jan O. Bustnes ◽  
Bård-Jørgen Bårdsen ◽  
Morten Helberg
Keyword(s):  
Nesting Habitat ◽  
Habitat Dynamics

scholarly journals Social media sows consensus in disturbance ecology

Nature ◽  
2020 ◽  
Vol 577 (7789) ◽  
pp. 170-170
Author(s):  
Emily B. Graham ◽  
Stefan Krause
Keyword(s):  
Social Media ◽  
Disturbance Ecology

scholarly journals Forest Climax Phenomenon: An Invariance of Scale

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 56 ◽  
Author(s):  
Raimundas Petrokas
Keyword(s):  
Natural Regeneration ◽  
Forest Regeneration ◽  
Forest Succession ◽  
Initial Conditions ◽  
Forest Tree ◽  
Tree Regeneration ◽  
Red Queen Hypothesis ◽  
Habitat Dynamics ◽  
Process Pattern ◽  
Sensitivity To Initial Conditions

We can think of forests as multiscale multispecies networks, constantly evolving toward a climax or potential natural community—the successional process-pattern of natural regeneration that exhibits sensitivity to initial conditions. This is why I look into forest succession in light of the Red Queen hypothesis and focus on the key aspects of ecological self-organisation: dynamical criticality, evolvability and intransitivity. The idea of the review is that forest climax should be associated with habitat dynamics driven by a large continuum of ecologically equivalent time scales, so that the same ecological conclusions could be drawn statistically from any scale. A synthesis of the literature is undertaken in order to (1) present the framework for assessing habitat dynamics and (2) present the types of successional trajectories based on tree regeneration mode in forest gaps. In general, there are four types of successional trajectories within the process-pattern of forest regeneration that exhibits sensitivity to initial conditions: advance reproduction specialists, advance reproduction generalists, early reproduction generalists and early reproduction specialists. A successional trajectory is an expression of a fractal connectivity among certain patterns of natural regeneration in the multiscale multispecies networks of landscape habitats. Theoretically, the organically derived measures of pattern diversity, integrity and complexity, determined by the rates of recruitment, growth and mortality of forest tree species, are the means to test the efficacy of specific interventions to avert the disturbance-related decline in forest regeneration. That is of relevance to the emerging field of biocomplexity research.

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