The interactive effects of climate change and land use on boreal stream fish communities

2020 ◽  
Vol 700 ◽  
pp. 134518 ◽  
Author(s):  
Alyssa Murdoch ◽  
Chrystal Mantyka-Pringle ◽  
Sapna Sharma
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Fish Communities ◽  
Interactive Effects ◽  
Stream Fish

scholarly journals Climate and land-use changes interact to drive long-term reorganization of riverine fish communities globally

2021 ◽  
Vol 118 (27) ◽  
pp. e2011639118
Author(s):  
Lise Comte ◽  
Julian D. Olden ◽  
Pablo A. Tedesco ◽  
Albert Ruhi ◽  
Xingli Giam
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Water Temperature ◽  
Land Use Changes ◽  
Fish Communities ◽  
Biodiversity Loss ◽  
Interactive Effects ◽  
Distribution Ranges ◽  
Spatially Varying ◽  
Riverine Systems

As climate change unfolds, changes in population dynamics and species distribution ranges are expected to fundamentally reshuffle communities worldwide. Yet, a comprehensive understanding of the mechanisms and extent of community reorganization remains elusive. This is particularly true in riverine systems, which are simultaneously exposed to changing temperature and streamflow, and where land-use change continues to be a major driver of biodiversity loss. Here, we use the most comprehensive compilation of fish abundance time series to date to provide a global synthesis of climate- and LU-induced effects on riverine biota with respect to changes in species thermal and streamflow affinities. We demonstrate that fish communities are increasingly dominated by thermophilic (warm-water) and limnophilic (slow-water) species. Despite being consistent with trends in water temperature and streamflow observed over recent decades, these community changes appear largely decoupled from each other and show wide spatial variation. We further reveal a synergy among climate- and land use-related drivers, such that community thermophilization is heightened in more human-modified systems. Importantly, communities in which species experience thermal and flow regimes that approach or exceed their tolerance thresholds (high community sensitivity), as well as species-poor communities (low community resilience), also display faster rates of compositional change. This research illustrates that quantifying vulnerability of riverine systems to climate change requires a broadening from a narrower thermal focus to more integrative approaches that account for the spatially varying and multifaceted sensitivity of riverine organisms to the interactive effects of water temperature, hydrology, and other anthropogenic changes.

Revealing the pathways by which agricultural land-use affects stream fish communities in South Brazilian grasslands

2016 ◽  
Vol 61 (11) ◽  
pp. 1921-1934 ◽  
Author(s):  
Renato B. Dala-Corte ◽  
Xingli Giam ◽  
Julian D. Olden ◽  
Fernando G. Becker ◽  
Taís de F. Guimarães ◽  
...  
Keyword(s):  
Land Use ◽  
Agricultural Land ◽  
Fish Communities ◽  
Agricultural Land Use ◽  
Stream Fish

Assessing the biological relevance of aquatic connectivity to stream fish communities

2014 ◽  
Vol 71 (12) ◽  
pp. 1852-1863 ◽  
Author(s):  
Shad Mahlum ◽  
Dan Kehler ◽  
David Cote ◽  
Yolanda F. Wiersma ◽  
Les Stanfield
Keyword(s):  
Land Use ◽  
Large Scale ◽  
Fish Assemblages ◽  
Explanatory Power ◽  
Structural Connectivity ◽  
Fish Communities ◽  
Stream Fish ◽  
Aquatic Connectivity ◽  
Longitudinal Connectivity ◽  
Riverine Systems

Recent advances in the ability to quantify longitudinal connectivity of riverine systems is enabling a better understanding of how connectivity affects fish assemblages. However, the role of connectivity relative to other factors, such as land use, in structuring biological assemblages is just emerging. We assessed the relevance of a structural connectivity index to stream fish communities at a relatively large scale (across five watersheds of Lake Ontario) while controlling for confounding habitat variables, such as land use, elevation, and stream topology. The results were assessed to determine whether species’ sensitivities to connectivity are in accordance with expectations of life history. Our results indicated that at large scales, structural connectivity explains significant amounts of variation in community structure (1% to 5.4% as measured by Bray–Curtis similarity), but remains secondary to other habitat components. Connectivity also was significantly related to abundance in three of the seven species assessed. The lower explanatory power of our models compared with studies done at smaller scales suggests that the relevance of connectivity to fish communities is scale-dependent and diminishes relative to other environmental factors at larger spatial extents.

scholarly journals The role of land use and land cover change in climate change vulnerability assessments of biodiversity: a systematic review

2021 ◽  
Author(s):  
Maria J. Santos ◽  
Adam B. Smith ◽  
Stefan C. Dekker ◽  
Maarten B. Eppinga ◽  
Pedro J. Leitão ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Land Cover ◽  
Population Viability ◽  
Interactive Effects ◽  
Negative Effects ◽  
Climate Change Vulnerability ◽  
Management Intervention ◽  
Vulnerability Assessments

Abstract Context For many organisms, responses to climate change (CC) will be affected by land-use and land-cover changes (LULCC). However, the extent to which LULCC is concurrently considered in climate change vulnerability assessments (CCVAs) is unclear. Objectives We identify trends in inclusion of LULCC and CC in vulnerability assessments of species and the direction and magnitude of their combined effect on biodiversity. Further, we examine the effect size of LULCC and CC in driving changes in “currencies” of response to CC, such as distribution, abundance and survival. Methods We conducted a systematic literature review of articles published in the last 30 years that focused on CCVA and accounted for impacts of both CC and LULCC. Results Across 116 studies, 34% assumed CC and LULCC would act additively, while 66% allowed for interactive effects. The majority of CCVAs reported similar effect sizes for CC and LULCC, although they affected different CCVA currencies. Only 14% of the studies showed larger effects of CC than of LULCC. Another 14% showed larger effects of LULCC than CC, specifically for dispersal, population viability, and reproduction, which tend to be strongly affected by fragmentation and disturbance. Although most studies found that LULCC and CC had negative effects on species currencies, in some cases effects were neutral or even positive. Conclusions CCVAs that incorporate LULCC provided a better account of drivers of vulnerability, and highlight aspects of drivers that are generally more amenable to on-the-ground management intervention than CCVAs that focus on CC alone.

Assessing the legacy of land use trajectories on stream fish communities of southern Brazil

Hydrobiologia ◽  
2020 ◽  
Author(s):  
Mateus Camana ◽  
Renato Bolson Dala-Corte ◽  
Fernanda Carello Collar ◽  
Fernando Gertum Becker
Keyword(s):  
Land Use ◽  
Fish Communities ◽  
Stream Fish ◽  
Southern Brazil

Climate Change and Land Use Change of Rural Households in The Red River Delta, Vietnam

2013 ◽  
pp. 79-94
Author(s):  
Ngoc Luu Bich
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Agricultural Land ◽  
Rural Households ◽  
River Delta ◽  
Red River ◽  
Red River Delta ◽  
Sea Levels ◽  
Main Production ◽  
Farming Households

Climate change (CC) and its impacts on the socio-economy and the development of communities has become an issue causing very special concern. The rise in global temperatures, in sea levels, extreme weather phenomena, and salinization have occurred more and more and have directly influenced the livelihoods of rural households in the Red River Delta – one of the two regions projected to suffer strongly from climate change in Vietnam. For farming households in this region, the major and traditional livelihoods are based on main production materials as agricultural land, or aquacultural water surface Changes in the land use of rural households in the Red River Delta during recent times was influenced strongly by the Renovation policy in agriculture as well as the process of industrialization and modernization in the country. Climate change over the past 5 years (2005-2011) has started influencing household land use with the concrete manifestations being the reduction of the area cultivated and the changing of the purpose of land use.

PETANI KUNINGAN DALAM PUSARAN KONFLIK KELAS

1970 ◽  
Vol 13 (2) ◽  
Author(s):  
Nanang Susanto
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Action Research ◽  
Participatory Action Research ◽  
Soil Nutrients ◽  
Qualitative Approach ◽  
Participatory Action ◽  
Cost Of Production ◽  
Depth Interviews ◽  
Participatory Observation

Penelitian ini menguji teori Marx yang mengatakan bahwa dalam proses kapitalisasi, petani lahan kecil akan tergusur oleh petani lahan besar. Penelitian ini menggunakan pendekatan kualitatif dengan metode Participatory Action Research (PAR). Menggunakan teknik observasi partisipasi di lapangan, studi ini melakukan wawancara mendalam terhadap petani. Analisis data yang digunakan bersifat induktif. Penelitian ini menghasilkan kesimpulan, bahwa teori Marx tidak terjadi di malar Aman. Adapun penyebab menurunnya pertanian disebabkan menurunnya unsur hara tanah, mahalnya biaya produksi, alih fungsi lahan dan perubahan cuaca. Sedangkan strategi petani lahan kecil untuk mempertahankan kehidupan yaitu melakukan pola tanam tumpang sari, melakukan pekerjaan tambahan, dan mengatur keuangan.This study examines Marx's theory which says that in the process of capitalization, small land farmers will be displaced by large land farmers. This study uses a qualitative approach with the method of Participatory Action Research (PAR). Using the techniques of participatory observation in the field, the study conducted in-depth interviews on farmers. Analysis of the data used is inductive. This study led to the conclusion that Marx's theory does not happen in Aman malar. The cause of the decline of agriculture due to declining soil nutrients, the high cost of production, land use and climate change. While the strategies of small land farmers to sustain life is to do the planting patterns of intercropping, do extra work, and manage finances.

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