scholarly journals The influence of habitat on the spatio-temporal dynamics of fish assemblages in a lagoon-estuarine system of the Mexican Pacific

2020 ◽  
Vol 48 (1) ◽  
pp. 23-37
Author(s):  
Emilio I. Romero-Berny ◽  
Ernesto Velázquez-Velázquez ◽  
Juan J. Schmitter-Soto ◽  
Isaías H. Salgado-Ugarte
Keyword(s):  
Fish Assemblages ◽  
Temporal Dynamics ◽  
Fish Habitat ◽  
Habitat Associations ◽  
Estuarine System ◽  
Nursery Ground ◽  
Fish Assemblage Structure ◽  
Mexican Pacific ◽  
Spatio Temporal ◽  
Physical And Chemical

Fish assemblages change significantly with physical and chemical characteristics of water; however, their response to the variability of geomorphic habitats has been rarely evaluated in lagoon-estuarine in one of these systems of the Mexican Pacific. Spatio-temporal variation of fish assemblage structure was assessed for three habitats: lagoon, estuarine, channel and inlet. The hypothesis was that sheltered areas support comparatively higher richness and abundance of fish species, with more small-sized specimens than the most exposed areas. We found that the ichthyofauna differed significantly among habitats. Several species were smaller in the lagoon compared with the other habitats, suggesting a use of the lagoon as a nursery ground. Moreover, dominant species for the lagoon were rarely found or absent in the inlet, whereas others were found only present or with higher abundance in the inlet. Although seasonal differences in richness and composition were detected, the evidence of fish-habitat associations for many species was noticeable regardless of seasonality, probably due to a high percentage of resident species during the annual cycle. The lagoon supports a greater abundance and species richness, due to a more sheltered and structured habitat, evidencing habitat-driven segregation in fish assemblages, and an aspect that should be incorporated for management of coastal ecosystems.

scholarly journals Temporal Dynamics of Fish Assemblages as a Reflection of Policy Shift from Fishing Concession to Co-Management in One of the World’s Largest Tropical Flood Pulse Fisheries

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2974 ◽  
Author(s):  
Bunyeth Chan ◽  
Peng Bun Ngor ◽  
Zeb S. Hogan ◽  
Nam So ◽  
Sébastien Brosse ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
Temporal Dynamics ◽  
Flood Pulse ◽  
Commercial Fishing ◽  
Fish Assemblage Structure ◽  
Policy Reforms ◽  
Fisheries Governance ◽  
Inland Fisheries ◽  
Fish Catch

Inland fisheries management in Cambodia has undergone two major policy reforms over the last two decades. These reforms led to the abolishment of a century-old commercial fishing lot system in 2012 and the establishment of new fish sanctuary and community fishing areas. However, the status of fisheries and fish assemblages following the reforms is not well understood. Here, we investigated the temporal changes in fish catch weight and fish assemblage structure for the period 1995–2000 before fishing lot abolishment (BLA) and for the period 2012–2015 after the removal of all fishing lots (after lot abolishment-ALA) using time-series fish catch data recorded from the Tonle Sap Lake (TSL), one of the world largest inland fisheries. We found (i) mean catch trends vary seasonally, with stable catch trends during the BLA and decreasing catch trends during the ALA and (ii) significant shifts in fish assemblage composition, notably a shift from large-bodied, migratory, and/or predatory species during the BLA toward more short-distance migratory and/or floodplain, small-bodied species during the ALA. Fishing lot abolishment coincided with substantial changes to floodplain habitats and increases in fishing pressure, threatening TSL fish stocks. Flow alterations caused by dams and climate change may exacerbate the problem. Therefore, to realize the fisheries reform objectives, it is imperative to strengthen the fisheries’ governance and management system, including effective law enforcement, institutional strengthening, improved planning, cooperation, and coordination as well as clearly defined roles and responsibilities among concerned stakeholders at all levels.

Geographic, anthropogenic, and habitat influences on Great Lakes coastal wetland fish assemblages

2009 ◽  
Vol 66 (8) ◽  
pp. 1328-1342 ◽  
Author(s):  
Anett S. Trebitz ◽  
John C. Brazner ◽  
Nicholas P. Danz ◽  
Mark S. Pearson ◽  
Gregory S. Peterson ◽  
...  
Keyword(s):  
Great Lakes ◽  
Aquatic Vegetation ◽  
Coastal Wetland ◽  
Fish Assemblages ◽  
Fish Habitat ◽  
Water Clarity ◽  
Habitat Associations ◽  
Submerged Vegetation ◽  
Great Lakes Coastal Wetland ◽  
Natural Watersheds

We analyzed data from coastal wetlands across the Laurentian Great Lakes to identify fish assemblage patterns and relationships to habitat, watershed condition, and regional setting. Nonmetric multidimensional scaling (NMDS) ordination of electrofishing catch-per-effort data revealed an overriding geographic and anthropogenic stressor gradient that appeared to structure fish composition via impacts on water clarity and vegetation structure. Wetlands in Lakes Erie and Michigan with agricultural watersheds, turbid water, little submerged vegetation, and a preponderance of generalist, tolerant fishes occupied one end of this gradient, while wetlands in Lake Superior with largely natural watersheds, clear water, abundant submerged vegetation, and diverse fishes occupied the other. Fish composition was also related to wetland morphology, hydrology, exposure, and substrate, but this was only evident within low-disturbance wetlands. Anthropogenic stress appears to homogenize fish composition among wetlands and mask other fish–habitat associations. Because land use is strongly spatially patterned across the Great Lakes and aquatic vegetation is a key habitat element that responds to both biogeography and disturbance, it is difficult to disentangle natural from anthropogenic drivers of coastal wetland fish composition.

Spatio-temporal dynamics of heavy metals in sediments of the river estuarine system: Mahanadi basin (India)

2013 ◽  
Vol 71 (4) ◽  
pp. 1893-1909 ◽  
Author(s):  
Sanjay Kumar Sundaray ◽  
Binod Bihari Nayak ◽  
Byeong-Gweon Lee ◽  
Dinabandhu Bhatta
Keyword(s):  
Heavy Metals ◽  
Temporal Dynamics ◽  
Estuarine System ◽  
Mahanadi Basin ◽  
Spatio Temporal ◽  
River Estuarine

scholarly journals Colony geometry and structural complexity of the endangered speciesAcropora cervicornispartly explains the structure of their associated fish assemblage

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1861 ◽  
Author(s):  
Esteban A. Agudo-Adriani ◽  
Jose Cappelletto ◽  
Francoise Cavada-Blanco ◽  
Aldo Croquer
Keyword(s):  
Fish Assemblage ◽  
Fish Community ◽  
Fish Assemblages ◽  
Three Dimensional ◽  
Structural Complexity ◽  
Habitat Associations ◽  
Coral Tissue ◽  
Live Coral ◽  
Fish Assemblage Structure ◽  
Acropora Cervicornis

In the past decade, significant efforts have been made to describe fish-habitat associations. However, most studies have oversimplified actual connections between fish assemblages and their habitats by using univariate correlations. The purpose of this study was to identify the features of habitat forming corals that facilitate and influences assemblages of associated species such as fishes. For this we developed three-dimensional models of colonies ofAcropora cervicornisto estimate geometry (length and height), structural complexity (i.e., volume, density of branches, etc.) and biological features of the colonies (i.e., live coral tissue, algae). We then correlated these colony characteristics with the associated fish assemblage using multivariate analyses. We found that geometry and complexity were better predictors of the structure of fish community, compared to other variables such as percentage of live coral tissue or algae. Combined, the geometry of each colony explained 40% of the variability of the fish assemblage structure associated with this coral species; 61% of the abundance and 69% of fish richness, respectively. Our study shows that three-dimensional reconstructions of discrete colonies ofAcropora cervicornisprovides a useful description of the colonial structural complexity and may explain a great deal of the variance in the structure of the associated coral reef fish community. This demonstration of the strongly trait-dependent ecosystem role of this threatened species has important implications for restoration and conservation efforts.

Flow-induced alterations to fish assemblages, habitat and fish–habitat associations in a regulated lowland river

Hydrobiologia ◽  
2013 ◽  
Vol 722 (1) ◽  
pp. 205-222 ◽  
Author(s):  
C. M. Bice ◽  
S. L. Gehrig ◽  
B. P. Zampatti ◽  
J. M. Nicol ◽  
P. Wilson ◽  
...  
Keyword(s):  
Fish Assemblages ◽  
Fish Habitat ◽  
Habitat Associations ◽  
Lowland River

Spatial and temporal dynamics of temperate Australian rockpool ichthyofaunas

2003 ◽  
Vol 54 (2) ◽  
pp. 163 ◽  
Author(s):  
Shane P. Griffiths
Keyword(s):  
Fish Assemblages ◽  
Temporal Dynamics ◽  
New South ◽  
Common Species ◽  
Spatial And Temporal Variation ◽  
Future Research ◽  
Fish Assemblage Structure ◽  
Intertidal Environment ◽  
South Wales ◽  
Spatial And Temporal Dynamics

Spatial and temporal variation, and factors influencing the structure of intertidal rockpool fish assemblages were quantitatively investigated at three large rocky headlands in south-eastern New South Wales, Australia. A total of 5244 fish from 46 species, mainly permanent intertidal residents from the families Clinidae, Blenniidae, Tripterygiidae, Gobiidae, Gobiesocidae and Girellidae, was caught in the rockpools. Numbers of species and individuals and dominance patterns of species showed significant variability within locations, possibly in response to variations in rockpool tidal height and volume, or environmental variables, such as temperature and dissolved oxygen. Species composition also differed among locations, probably as a result of availability of different habitats at each location, which may be preferred by different species. Fish assemblage structure was stable and persistent through time, presumably because rockpools are colonized only by species suitably adapted to the dynamic intertidal environment. Temporal variability in the abundance of some common species occurred during summer and autumn, mainly owing to recruitment of resident fishes. Directions for future research are given, which may contribute to an understanding of the processes that underpin these patterns.

Fish habitat management implications of the summer habitat use by littoral fishes in a north temperate, mesotrophic lake

2003 ◽  
Vol 60 (3) ◽  
pp. 286-300 ◽  
Author(s):  
Thomas C Pratt ◽  
Karen E Smokorowski
Keyword(s):  
Habitat Heterogeneity ◽  
Habitat Management ◽  
Fish Assemblages ◽  
Fish Habitat ◽  
Distinct Species ◽  
Habitat Associations ◽  
Productive Capacity ◽  
Habitat Types ◽  
Habitat Directive ◽  
Rocky Habitats

Compensation measures in response to Fisheries and Oceans Canada (DFO) Policy for the Management of Fish Habitat includes provisions for habitat creation and enhancement. Thus, an assessment of nearshore habitat utilization patterns by fishes is needed to put DFO compensation measures in the context of the "no net loss of the productive capacity of fish habitat" directive. Measures of abundance, richness, and diversity of fishes were compared across nine habitat types in a lake using rapid visual underwater assessment. Multivariate analyses separated habitats into three groups and identified two distinct species assemblages. Most species were associated with macrophytes, but a few were primarily associated with rocky substrate. Shallow mud (open) habitats contained significantly fewer species and had lower mean scores and diversity than all other habitat types. Rocky habitats had lower mean scores and diversity than some vegetated habitat types containing similar fish assemblages. Surprisingly, within-site fish assemblage heterogeneity was similar to among-site heterogeneity, and among-habitat heterogeneity was lower than within-habitat heterogeneity, further supporting our inability to distinguish among vegetated habitat types. Our results suggest that habitat heterogeneity is critical in maintaining diverse communities and that compensation measures should account for differences in fish–habitat associations among varied habitats.

Spatio-temporal dynamics of fish feeding in the lower Mulgrave River, north-eastern Queensland: the influence of seasonal flooding, instream productivity and invertebrate abundance

2009 ◽  
Vol 60 (2) ◽  
pp. 97 ◽  
Author(s):  
Thomas S. Rayner ◽  
Bradley J. Pusey ◽  
Richard G. Pearson
Keyword(s):  
Habitat Structure ◽  
Fish Community ◽  
Temporal Dynamics ◽  
Fish Habitat ◽  
Habitat Model ◽  
Trophic Dynamics ◽  
Gut Contents ◽  
Wet Season ◽  
Littoral Invertebrates ◽  
Spatio Temporal

Wet-season flooding causes dietary shifts in tropical freshwater fish by regulating instream productivity, habitat structure and food availability. These dynamics have been comprehensively documented worldwide, but data are limited for Australia’s Wet Tropics rivers. The aim of the present study was to extend our earlier fish–habitat model for these systems by examining the role of trophic dynamics in determining fish assemblage composition. Chlorophyll a and phaeophytin concentrations, benthic and littoral invertebrates and fish were collected at four sites in the lower Mulgrave River under a range of flow conditions. Wet-season flooding caused significant reductions in instream productivity, whereas habitat disturbance reduced densities and abundances of littoral and benthic invertebrates. However, volumetric gut contents of 1360 fish, from 36 species, revealed seasonal shifts in guild membership by only two species, with fish moving between sites to target their preferred prey items – largely irrespective of differences in habitat structure. As a result, the food consumed by the fish community present at each site closely reflected the seasonal availability of food resources. The present paper questions whether fish community composition in small tropical rivers can be accurately predicted from habitat surrogates alone and encourages consideration of constraints imposed by the trophic dynamics and reproductive ecology of fish.

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