scholarly journals Global and Regional Patterns in Riverine Fish Species Richness: A Review

2011 ◽  
Vol 2011 ◽  
pp. 1-12 ◽  
Author(s):  
Thierry Oberdorff ◽  
Pablo A. Tedesco ◽  
Bernard Hugueny ◽  
Fabien Leprieur ◽  
Olivier Beauchard ◽  
...  
Keyword(s):  
Climate Change ◽  
Species Richness ◽  
Fish Species ◽  
Freshwater Biodiversity ◽  
Regional Patterns ◽  
Species Invasions ◽  
Regional Factors ◽  
Richness Patterns ◽  
Riverine Fish

We integrate the respective role of global and regional factors driving riverine fish species richness patterns, to develop a synthetic model of potential mechanisms and processes generating these patterns. This framework allows species richness to be broken down into different components specific to each spatial extent and to establish links between these components and the processes involved. This framework should help to answer the questions that are currently being asked by society, including the effects of species invasions, habitat loss, or fragmentation and climate change on freshwater biodiversity.

Congruence between riverine fish species richness and endemism at the biogeographical scale: the role of history

2008 ◽  
Vol 18 (7) ◽  
pp. 1311-1314 ◽  
Author(s):  
Yorick Reyjol ◽  
Bernard Hugueny ◽  
Pier Giorgio Bianco ◽  
Didier Pont
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Riverine Fish

scholarly journals Arthropod community structure in pastures of an island archipelago (Azores): looking for local–regional species richness patterns at fine-scales

2004 ◽  
Vol 94 (2) ◽  
pp. 111-121 ◽  
Author(s):  
P.A.V. Borges ◽  
V.K. Brown
Keyword(s):  
Species Richness ◽  
Regional Scale ◽  
Local Scale ◽  
Local Species Richness ◽  
Β Diversity ◽  
Arthropod Species ◽  
Α Diversity ◽  
Local Species ◽  
Richness Patterns

AbstractThe arthropod species richness of pastures in three Azorean islands was used to examine the relationship between local and regional species richness over two years. Two groups of arthropods, spiders and sucking insects, representing two functionally different but common groups of pasture invertebrates were investigated. The local–regional species richness relationship was assessed over relatively fine scales: quadrats (= local scale) and within pastures (= regional scale). Mean plot species richness was used as a measure of local species richness (= α diversity) and regional species richness was estimated at the pasture level (= γ diversity) with the ‘first-order-Jackknife’ estimator. Three related issues were addressed: (i) the role of estimated regional species richness and variables operating at the local scale (vegetation structure and diversity) in determining local species richness; (ii) quantification of the relative contributions of α and β diversity to regional diversity using additive partitioning; and (iii) the occurrence of consistent patterns in different years by analysing independently between-year data. Species assemblages of spiders were saturated at the local scale (similar local species richness and increasing β-diversity in richer regions) and were more dependent on vegetational structure than regional species richness. Sucking insect herbivores, by contrast, exhibited a linear relationship between local and regional species richness, consistent with the proportional sampling model. The patterns were consistent between years. These results imply that for spiders local processes are important, with assemblages in a particular patch being constrained by habitat structure. In contrast, for sucking insects, local processes may be insignificant in structuring communities.

Watershed-level sampling effort requirements for determining riverine fish species composition

2005 ◽  
Vol 62 (7) ◽  
pp. 1580-1588 ◽  
Author(s):  
Katherine L Smith ◽  
Michael L Jones
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Fish Species ◽  
Correlation Coefficients ◽  
Sampling Effort ◽  
Species Accumulation Curves ◽  
Targeted Sampling ◽  
Weak Negative Correlation ◽  
Fish Species Composition ◽  
Riverine Fish

Accurate assessments of watershed-level species composition are necessary for comparative ecological studies, ecosystem health assessments, monitoring, and aquatic conservation prioritization. Several studies have addressed sampling effort requirements for characterizing fish species composition at a section of stream, but none have examined watershed-level requirements. In the spring and summer of 2002, we extensively sampled nine Great Lakes watersheds to assess sampling-effort requirements. Sampling requirements increased with the targeted percentage of estimated species richness. Sampling 15–119 randomly selected reaches of stream, stratified by stream order, was on average sufficient to detect 80%–100% of estimated species richness. Watershed size (km2) and estimated species richness each showed a weak, negative correlation with sampling-effort requirements in our study streams, with Pearson's correlation coefficients of –5.06 and –0.590, respectively. Because of among-watershed variability in sampling effort requirements, field crews should plot species accumulation curves onsite to determine adequate inventory completion. Based on the difficulty of detecting the last 10% of species, random sampling should be conducted in conjunction with targeted sampling of rare species.

scholarly journals Northern Cerrado Native Vegetation is a Refuge for Birds Under Current Climate Change

2021 ◽  
Author(s):  
José Hidasi-Neto ◽  
Nicole Mércia Alves Gomes ◽  
Nelson Silva Pinto
Keyword(s):  
Climate Change ◽  
Species Richness ◽  
Beta Diversity ◽  
Climate Scenario ◽  
Niche Modelling ◽  
Alpha And Beta Diversity ◽  
Management Actions ◽  
Species Invasions ◽  
Local Extinctions ◽  
Temporal Beta Diversity

Climate Change is already seen as one of the biggest threats to biodiversity in the 21 st century. Not much studies direct attention to its effects on whole communities of threatened hotspots. In the present work, we combine ecological niche modelling (ENM) with a future climate scenario of greenhouse gases emissions to study the future changes in alpha and beta diversity of birds of the Brazilian Cerrado biome, a hotspot of biodiversity with high velocity of climate change and agricultural expansion. In general, we found heterogeneous results for changes in species richness, spatial and temporal taxonomic and functional beta diversity, and mean ecological distinctiveness. Contrary to a previous study on Cerrado mammals, species richness is expected to increase in Northern Cerrado, where homogenization of communities (decreasing spatial turnover) is also expected to occur especially through local invasions. We show that biotic homogenization (which is composed of local extinction of natives and local invasion of exotic species) will occur in two biological groups but through different subprocesses: local extinctions for mammals and local invasions for birds. Distinct conservation management actions should be directed depending on the outcomes of analyzes of alpha and spatial and temporal beta diversity, for example controlling species invasions in Northern Cerrado. Conservation studies should continue evaluating Cerrado in Brazil even under covid pandemic, as environmental situation in the country is not good and incentives for scientific studies are almost nonexistent.

Processes governing riverine fish species richness are scale-independent

2009 ◽  
Vol 10 (1) ◽  
pp. 17-24 ◽  
Author(s):  
T. Romanuk ◽  
B. Beisner ◽  
A. Hayward ◽  
L. Jackson ◽  
J. Post ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Riverine Fish

scholarly journals Illustrating a new approach to estimating potential reduction in fish species richness due to flow alteration on a global scale

2013 ◽  
Vol 10 (6) ◽  
pp. 7837-7856 ◽  
Author(s):  
S. Yoshikawa ◽  
A. Yanagawa ◽  
A. Khajuria ◽  
P. Sui ◽  
Y. Iwasaki ◽  
...  
Keyword(s):  
Climate Change ◽  
Species Richness ◽  
Fish Species ◽  
Statistical Models ◽  
River Discharge ◽  
Global Scale ◽  
The Other ◽  
Freshwater Ecosystem ◽  
Global Simulation ◽  
Flow Alteration

Abstract. Changes in river discharge due to human activities and climate change would affect the sustainability of freshwater ecosystem. In order to globally assess the future status of freshwater ecosystem under regime shifts in river discharge, global-scale hydrological simulations need to be connected with a model to estimate the soundness of freshwater ecosystem. However, the explicit combination of those two on a global scale is still in its infancy. A couple of statistical models are introduced here to link flow regimes to fish species richness (FSR): one based on a linear relationship between FSR and mean river discharge, and the other based on a relationship between FSR and ecologically relevant flow indices involving other several flow characteristics as well as mean river discharge. The former one has been sometimes used in global simulation studies, but the latter one is newly introduced here in the context of global simulation. These statistical models for estimating FSR were combined with a set of global river discharge simulations to evaluate the potential impact of flow alterations due to climate change on FSR changes. Generally, future reductions in FSR by the latter method are larger and much more scattered rather than by the former method. In arid regions, both models provide reductions in FSR because mean discharge is projected to decrease from past to future, although the magnitude of reduction in FSR is different. On the other hand, large reductions in FSR only by the latter model are detected in heavy-snow regions due to the increases of mean discharge and frequency of low and high flows. Although we need further research to conclude which is more relevant, this study demonstrates that the new model could show a considerably different behavior in assessing the global impact of flow alteration on freshwater ecosystem change.

Sign in / Sign up

Export Citation Format

Share Document