Ecological studies of colonized invertebrate communities on cultivated seaweeds in a typical mariculture zone, China

Community structure of invertebrate fauna in Central Chilean Rivers

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x3718 ◽

2019 ◽

Vol 31 ◽

Author(s):

Patricio De los Ríos ◽

Gustavo Díaz ◽

Jorge Gonzalez ◽

Konrad Górski ◽

Evelyn Habit

Keyword(s):

Community Structure ◽

Interspecific Competition ◽

Niche Overlap ◽

Null Models ◽

Ecological Studies ◽

Invertebrate Fauna ◽

River Systems ◽

Central Chile ◽

Invertebrate Communities ◽

Ecological Patterns

Abstract Aim River systems of Central Chile are short, steep and fast flowing. They are characterized by discharge regimes dominated by rainfall and snowmelt. Invertebrate fauna is highly endemic. This study aimed to describe the community structure of invertebrate in eight river systems in Central Chile (33-39°S) using species co-occurrence and niche sharing null models. Methods Invertebrate samples were collected from Central Chilean rivers (33-39°S), data were analyzed co-occurrence species and niche sharing null models for determine potential structuring patterns. Results The results revealed the presence of non-structured patterns in co-occurrence considering each site as well as all sites, that is most probably an effect of presence of many repeated species in the studied sites. Furthermore, we found the existence of niche overlap due to interspecific competition at each site and among all sites. The results obtained from these river systems corroborate observations from Chilean Patagonian Rivers. Conclusion This study contributes to understanding of biogeographical and ecological patterns of invertebrate communities in central Chilean Rivers and provide foundations for more complex ecological studies.

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Vegetation Shapes Aboveground Invertebrates Communities More Than Soil Properties and Pollution on a Metal Contaminated Site

10.21203/rs.3.rs-423039/v1 ◽

2021 ◽

Author(s):

Shinji Ozaki ◽

Clémentine Fritsch ◽

Frédéric Mora ◽

Thierry Cornier ◽

Renaud Scheifler ◽

...

Keyword(s):

Plant Communities ◽

Plant Diversity ◽

Soil Characteristics ◽

Community Identity ◽

Contaminated Site ◽

Direct Impact ◽

Ecological Studies ◽

Invertebrate Communities ◽

Animal Communities ◽

The Impact

Abstract Pollution with trace metals (TM) has been shown to affect diversity and/or composition of plant and animal communities. While ecotoxicological studies have estimated the impact of TM contamination on plant and animal communities separately, ecological studies have widely demonstrated that vegetation is an important factor shaping invertebrate communities. It is supposed that changes in invertebrate communities under TM contamination would be explained by both direct impact of TM on invertebrate organisms and indirect effects due to changes in plant communities. However, no study has clearly investigated which would more importantly shape invertebrate communities under TM contamination. Here, we hypothesized that invertebrate communities under TM contamination would be affected more importantly by plant communities which constitute their habitat and/or food than by direct impact of TM. Our analysis showed that diversity and community identity of flying invertebrates were explained only by plant diversity which was not affected by TM contamination. Diversity of ground-dwelling (GD) invertebrates in spring was explained more importantly by plant diversity (27% of variation) than by soil characteristics including TM concentrations (8%), whereas their community identity was evenly explained by plant diversity and soil characteristics (2-7%). In autumn, diversity of GD invertebrates was only explained by plant diversity (12%), and their identity was only explained by soil characteristics (8%). We conclude that vegetation shapes invertebrate communities more importantly than direct effects of TM on invertebrates. Vegetation should be taken into account when addressing the impacts of environmental contamination on animal communities.

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