Functional differentiation between fish assemblages from forested and deforested streams

Teresa, Fabrício Barreto; Casatti, Lílian; Cianciaruso, Marcus V.

doi:10.1590/1982-0224-20130229

Cited by 54 publications

(42 citation statements)

References 39 publications

(53 reference statements)

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“…An alternative method would be an evaluation of the spatial distribution of functional groups (Teresa et al, 2015). However, in addition to problems with group formation, the premise of this approach is that species within a group are identical and species from different groups are equally different; this assumption is not necessarily true (Petchey & Gaston, 2006), particularly when analyzing continuous traits, as it was done here.…”

Section: Discussionmentioning

confidence: 99%

Use of functional traits to assess changes in stream fish assemblages across a habitat gradient

2016

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Functional traits are important for understanding the links between species occurrence and environmental conditions. Identifying these links makes it possible to predict changes in species composition within communities under specific environmental conditions. We used functional traits related to habitat use and trophic ecology in order to assess the changes in fish community composition between streams with varying habitat structure. The relationship between the species traits and habitat characteristics was analyzed using an RLQ ordination analysis. Although species were widely distributed in habitats with different structures, physical conditions did favor some species based on their functional characteristics. Eight functional traits were found to be associated with stream habitat structure, allowing us to identify traits that may predict the susceptibility of fish species to physical habitat degradation.Os atributos funcionais são importantes para entender a ligação entre ocorrência das espécies e condições ambientais, permitindo predizer sobre as mudanças na composição de espécies em comunidades submetidas a condições ambientais específicas. Utilizamos atributos funcionais relacionados com o uso de habitat e ecologia trófica para avaliar as mudanças na composição de espécies de peixes em riachos com diferenças na estrutura física. O relacionamento entre os atributos das espécies e as variáveis ambientais foi avaliado por meio da análise de ordenação RLQ. Embora algumas espécies tenham sido amplamente distribuídas em hábitats com diferentes características, outras foram restritas por essas condições e este relacionamento está associado com as características morfológicas. Oito atributos funcionais foram capazes de detectar as variações na estrutura física do hábitat em riachos, permitindo a identificação de atributos que podem predizer a suscetibilidade das espécies de peixes para a degradação física do hábitat.

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Section: Discussionmentioning

confidence: 99%

Use of functional traits to assess changes in stream fish assemblages across a habitat gradient

2016

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“…A threshold dendrogram is then defined to determine the similarity level between species, allowing similar species to be grouped within the same functional group (Petchey & Gaston 2006). The dendrogram threshold is usually arbitrary (but see Teresa et al 2015) and it is defined according to the purpose of the study or the researchers' own criteria (Pla et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Assessing the spatial variation of functional diversity estimates based on dendrograms in phytoplankton communities

2017

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Variation in phytoplankton functional diversity is partioned and mapped using several indices and linkage methods based on dendrograms. Th e relationships between diversity metrics and major environmental predictors, including zooplankton density, were assessed in 29 phytoplankton communities of fl oodplain lakes distributed along the Middle Araguaia River in central Brazil. Th e dendrogram-based functional diversity indices were Functional Group Richness, Functional Diversity, Mean Pairwise Distance and Mean Nearest Taxon Distance, whereas seven diff erent hierarchical agglomerative linkage methods we used. Th e performance of indices were compared using ANOVA and their spatial variation in response to major environmental predictors evaluated. Th e results indicate that variation in functional diversity values is primarily a product of the type of index chosen. Th is variation was statistically signifi cant in 90 % of the fl oodplain lakes studied; however, a spatial pattern of variation in index values along the river was not detected. Furthermore, environmental constraints, including zooplankton density, were weak predictors of functional diversity indices. Th erefore, the mathematical characteristics of indices are of primary importance in explaining variation among functional diversity values.

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“…Particularly, deforestation may impact on specialist feeding guilds and species that prefer medium to hard substrate. Species that have specific diet or habitat requirements may be more vulnerable to habitat degradation (Teresa, Casatti & Cianciaruso, 2015) while generalists may be less affected because they can take advantage of various habitats (Devictor, Julliard & Jiguet, 2008). In this study, nearly all trait groups that contained endemic species were predicted to be impacted by deforestation (e.g., Redigobius leveri,…”

Section: Impacts From Anthropogenic Disturbances and The Implicationsmentioning

confidence: 71%

Conserving migratory species under human impacts and climate change

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Migratory species use multiple habitats types and ecosystems to complete their life cycles, which exposes them to multiple human-caused stressors along their migratory routes. Overexploitation, habitat degradation, invasive species and connectivity loss have contributed to the decrease of migratory fishes globally in particular diadromous fishes that migrate between marine and freshwater systems. Therefore, understanding the joint impacts from anthropogenic disturbances and climate change on different habitats (e.g., both feeding and spawning grounds) and habitat connectivity (e.g., migration routes) is important for conserving migratory fish.Management will be most effective when management scales match ecological scales. This is particularly important for conserving migratory species, because of the requirement of multiple connected habitats that may cross local management boundaries. The main goals of this Ph.D. thesis are to quantify the impacts of multiple stressors on migratory fish species and prioritize management actions for conserving populations (chapters 2 & 3), species (chapter 4), and communities (chapter 5).A central challenge for managing diadromous fishes (species that migrate between freshwater and saltwater ecosystems) is to quantify increases in population persistence from actions that improve connectivity or reduce fishing mortality. In chapter 2, I used a population dynamic model and fish movement data to predict the interactive impacts of fishing pressure and connectivity loss by human modification of river flows on Australian bass Percalates novemaculeata. Then, in chapter 3, the monetary cost of management actions which included seasonal closures and restoring connectivity, were included in the model to find the most cost-effective way to conserve this fish population. The results reveal that the cost-effectiveness of management actions may vary with river flow and fishing pressure before implementing management actions, and implementation times. The spatiotemporal dynamics of how fish species and key resource users (i.e., anglers) respond to management actions can influence the effectiveness of management strategies. Flexible management plans and increased cooperation between water and fishery managers can be used to achieve the most effective balance between conserving migratory fish populations and minimising cost.Migratory species are particularly vulnerable to climate change as they occupy different ecosystems, as well as transitional habitat which are all impacted by climate change differently.Anthropogenic barriers can further reduce the ability of species to respond to a shifting climate. In ii chapter 4, I assessed the impact of climate change on the distribution of a migratory fish species, Australian grayling Prototroctes maraena, and how it affected priorities for restoring connectivity. I found climate change moves at different rates in marine and freshwater systems, decoupling the habitats used by grayling. In addition, the changing spatial distribution of suitable ...

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Functional differentiation between fish assemblages from forested and deforested streams

Cited by 54 publications

References 39 publications

Use of functional traits to assess changes in stream fish assemblages across a habitat gradient

Use of functional traits to assess changes in stream fish assemblages across a habitat gradient

Assessing the spatial variation of functional diversity estimates based on dendrograms in phytoplankton communities

Conserving migratory species under human impacts and climate change

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