Ignasi Arranz

Ignasi Arranz
Paul Sabatier University - Toulouse III | UPS Toulouse · Laboratoire Evolution et Diversité Biologiques (EDB)

Biology
Quantitative and fish ecology. Happy to collaborate with any topic

About

29
Publications
7,876
Reads
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151
Citations
Introduction
My main interest is understanding the complexity of ecological systems, particularly using freshwater fish as a main study group. In this sense, I tackle questions such as who eats whom or who controls whom and answer them using theoretical backgrounds and quantitative analyses. I perform advanced statistical tools to explain community patterns and species coexistence.
Additional affiliations
September 2013 - September 2017
University of Vic
Position
  • PhD

Publications

Publications (29)
Article
Full-text available
We provide a unique fish individual body size dataset collected from our own sampling and public sources in north-eastern Spain. The dataset includes individual body size measures (fork length and mass) of 12,288 individuals of 24 fish species within 10 families collected at 118 locations in large rivers and small streams. Fish were caught by one-p...
Article
Full-text available
Environmental and geographical factors are known to influence the number, distribution and combination of species that coexist within ecological communities. This, in turn, should influence ecosystem functions such as biomass conservation, or the ability of a community to sustain biomass from small to large organisms. We tested this hypothesis by a...
Article
Full-text available
This study investigated the effects of environmental variation on fish diversity patterns in two coastal streams in northwestern Ecuador. Specifically, we examined the role of topography, instream conditions (pH, conductivity), and human influence (land-use modifications) on fish species richness, diversity and evenness as well as body size diversi...
Article
Full-text available
This study investigated the effects of environmental variation on fish diversity patterns in two coastal streams in northwestern Ecuador. Specifically , we examined the role of topography, instream conditions (pH, conductivity), and human influence (land-use modifications) on fish species richness, diversity and evenness as well as body size divers...
Article
Full-text available
Aquatic ecosystems are strongly body-size structured with a decline of numerical abundance with increasing body size (hereafter, the size spectrum).Marine and lake fish studies have reported consistent variations of size spectra in relation to environmental conditions and biotic composition, but little is known about streamfishes. Accordingly, in t...
Article
Full-text available
Aphanius iberus is an endemic cyprinodontoid fish species of Mediterranean ponds in danger of extinction. In this study, we studied some abiotic and biotic factors that can influence A. iberus’s size structure and density in Mediterranean brackish ponds. We sampled fish using fyke nets in 10 ponds of Empordà (Spain) during the spring season. Our re...
Article
Full-text available
New data about trichomycetes from the North-eastern Iberian Peninsula is reported, including the description of two new species of Amoebidiales and one species of Harpellales: Paramoebidum contortum from Baetidae and Ephemerellidae (Ephemeroptera, mayflies) nymphs, Paramoebidium lateralis from Capniidae and Leuctridae nymphs, and Ejectosporus chima...
Article
Full-text available
Fish can alter food web structure through trophic cascades. While most studies conducted in oligotrophic subarctic lakes show strong top–down control on consumers in the presence of fish, several studies undertaken in eutrophic subarctic Lake Mývatn, Iceland, suggest that it is consumer–resource interactions that drive the whole-lake community. Her...
Article
Full-text available
Size structure of organisms at logarithmic scale (i.e. size spectrum) can often be described by a linear function with a negative slope; however, substantial deviations from linearity have often been found in natural systems. Theoretical studies suggest that greater nonlinearity in community size spectrum is associated with high predator–prey size...
Article
Full-text available
Invasion of non-native species is considered a major threat to global biodiversity. Here we present a comprehensive overview of the occurrence, richness and biomass contribution of non-native fish species in 1943 standing water bodies from 14 countries of the Western Palearctic, based on standardised fish catches by multi-mesh gillnetting. We expec...
Article
1. Trophic cascade studies have so far mostly focused on changes in the abundance, biomass, or average size of prey and predators. In contrast, individual size-based interactions, playing a key role in the trophic structure and functioning of aquatic ecosystems, have been less explored. 2. We conducted a 3-month in situ experiment in Lake Myvatn, I...
Article
Full-text available
Body size, coupled with abundance and taxonomy, may help to understand the mechanisms shaping community structure. Since the body size of fish is closely related to their trophic niche, size diversity (based on individual body size) of fish communities may capture intraspecific variations in fish trophic niches that are not detected by species dive...
Article
Full-text available
Effects of fish predation on consumers tend to be particularly strong in oligotrophic Arctic and sub-Arctic lakes. However, it remains unclear whether the fish influence the trophic structure and dynamics of naturally eutrophic lakes in these cold environments with simple food web structures. To study this, we conducted a 3-month in situ-controlled...
Article
Full-text available
Metacommunity approaches are becoming popular when analyzing factors driving species distribution at the regional scale. However, until the popularization of the variation partitioning technique it was difficult to assess the main drivers of the observed patterns (spatial or environmental). Here we propose a new framework linking the emergence of d...
Article
We studied fish size structure by using mean size, size diversity, and the slope of linear size spectra of six common European fish species along large-scale environmental gradients. We further analyzed the response of these three size metrics to environmental variables and to density-dependent effects, i.e., relative estimates of abundance (catch...
Conference Paper
Full-text available
Large scale studies on individual size distribution of fish have primarily been done at community level, but little attention is paid at species level. We described fish size structure by using mean size, size diversity and the slope of linear size spectra of six common European fish species to compare whether these metrics responded to the same la...
Article
Full-text available
Contribution to the knowledge of the distribution of Chaoborus species (Diptera: Chaoboridae) in the NE Iberian Peninsula, with notes on the spatial and temporal segregation among them Phantom midges are characteristic inhabitants of standing waters and are well known for their diel migrations. Despite the extensive body of literature covering thei...
Conference Paper
Variations in the size structure of fish communities were explored at European scale along gradients of climate, morphometry, productivity and fish community structure in more than 1800 lakes. Size metrics used were average fish body size, individual size distributions and size diversity. Analyses were conducted at both continental and regional sca...
Article
Full-text available
This study was conducted to increase the understanding of the temporal dynamics of the plecopteran-associated endosymbiont species Orphella helicospora and Orphella catalaunica (Harpellales, Zygomycota) in the middle reaches of a stream in Montseny Natural Park (Barcelona, Spain). Previous studies addressing the temporal dynamics of Harpellales hav...

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Projects

Projects (2)
Project
The Urban algae project aims to study the ecological status of urban ponds and their ecosystem services together with the citizen´s perceptions. To this end, we will combine a sampling campaign during the summer 2018 in multiple locations across Europe with an online citizen survey questionnaire. With this set-up, we want to know what the public thinks about their ponds and if this is related to the ecological status of the relevant ponds. The second important goal of this initiative is to create an international collaborative network, encouraging young and early career scientists in Europe. This project provides an excellent chance to actively participate in an interdisciplinary project and meet other young researchers!
Project
AGRHYDROM is a collaborative project carried out by young researchers of the Iberian Association of Limnology in order to promote the networking between interdisciplinary young scientists. The main objective of the project is to study the combined effect of agriculture and seasonal hydrology on nutrients and DOM quantity, composition and bioavailability in temporary streams.