scholarly journals Fish community shifts along a strong fluvial environmental gradient revealed by eDNA metabarcoding

2021 ◽  
Author(s):  
Erik García‐Machado ◽  
Martin Laporte ◽  
Eric Normandeau ◽  
Cecilia Hernández ◽  
Guillaume Côté ◽  
...  
Keyword(s):  
Fish Community ◽  
Environmental Gradient ◽  
Community Shifts

Zooplankton production in the Bay of Quinte 1975–2008: relationships with primary production, habitat, planktivory, and aquatic invasive species (Dreissena spp. and Cercopagis pengoi)

2012 ◽  
Vol 69 (12) ◽  
pp. 2046-2063 ◽  
Author(s):  
Ora E. Johannsson ◽  
Kelly L. Bowen
Keyword(s):  
Fish Community ◽  
Abundant Species ◽  
Ratio Method ◽  
Nutrient Level ◽  
General Context ◽  
Cercopagis Pengoi ◽  
Community Shifts ◽  
Zooplankton Production ◽  
Changing Light ◽  
Trophic Range

The Bay of Quinte, a long, shallow, high-phosphorus system in Lake Ontario, spans a trophic range from eutrophic (upper Bay) to meso-oligotrophic (mouth). Phosphorus control (PC) and the invasion of dreissenid mussels and Cercopagis pengoi have influenced its biology and environment. We elucidated the principal drivers behind zooplankton production in the Bay from pre-PC times to the present (1975–2008). Production of abundant species was calculated using the egg-ratio method. Production estimates were improved by determining system-specific production/biomass (P/B) relationships for rarer species. Planktivory governed zooplankton production initially, likely preventing a response to PC. With changes in the fish community, zooplankton production increased. Thereafter, the principal drivers were the structure and size of the fish community, shifts in the predatory arena associated with changing light penetration, temperature, and addition of C. pengoi — all within a general context of nutrient availability. Dreissenid impacts were indirect. Interactive variables combining measures of predation, nutrient level, light, and temperature were the best at accounting for variability in zooplankton production.

scholarly journals Marine protected areas do not prevent marine heatwave-induced fish community structure changes in a temperate transition zone

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
R. M. Freedman ◽  
J. A. Brown ◽  
C. Caldow ◽  
J. E. Caselle
Keyword(s):  
Community Structure ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Fish Community ◽  
Kelp Forest ◽  
Community Response ◽  
Environmental Drivers ◽  
Fish Community Structure ◽  
Community Shifts ◽  
Water Affinity

AbstractAcute climate events like marine heatwaves have the potential to temporarily or permanently alter community structure with effects on biodiversity and ecosystem services. We aimed to quantify the magnitude and consistency of climate driven community shifts inside and outside Marine Protected Areas before and after a marine heatwave using a kelp forest fish community dataset in southern California, USA. Abundance, biomass, diversity and recruitment of warm-water affinity species during the marine heatwave were significantly greater compared with prior years yet cool-water affinity species did not show commensurate declines. Fish communities inside MPAs were not buffered from these community shifts. This result is likely because the particular species most responsible for the community response to environmental drivers, were not fisheries targets. Resource managers working to preserve biodiversity in a changing climate will need to consider additional management tools and strategies in combination with protected areas to mitigate the effect of warming on marine communities.

scholarly journals Fish community in a large coastal subtropical lake: how an environmental gradient may affect the structure of trophic guilds

Limnetica ◽  
2015 ◽  
pp. 495-506
Author(s):  
Ribeiro Rodrigues, Lúcia ◽  
da Motta Marques, David ◽  
Ferreira Fontoura, Nelson
Keyword(s):  
Fish Community ◽  
Environmental Gradient ◽  
Trophic Guilds ◽  
Subtropical Lake

Dominance determines fish community biomass in a temperate seagrass ecosystem

2019 ◽  
Author(s):  
Aaron Matthius Eger ◽  
Rebecca J. Best ◽  
Julia Kathleen Baum
Keyword(s):  
Species Richness ◽  
Ecosystem Function ◽  
Fish Community ◽  
Prey Capture ◽  
Fish Communities ◽  
Functional Trait ◽  
Ecosystem Functions ◽  
Community Biomass ◽  
Ecosystem Valuation ◽  
Species Abundances

Biodiversity and ecosystem function are often correlated, but there are multiple hypotheses about the mechanisms underlying this relationship. Ecosystem functions such as primary or secondary production may be maximized by species richness, evenness in species abundances, or the presence or dominance of species with certain traits. Here, we combined surveys of natural fish communities (conducted in July and August, 2016) with morphological trait data to examine relationships between diversity and ecosystem function (quantified as fish community biomass) across 14 subtidal eelgrass meadows in the Northeast Pacific (54° N 130° W). We employed both taxonomic and functional trait measures of diversity to investigate if ecosystem function is driven by species diversity (complementarity hypothesis) or by the presence or dominance of species with particular trait values (selection or dominance hypotheses). After controlling for environmental variation, we found that fish community biomass is maximized when taxonomic richness and functional evenness is low, and in communities dominated by species with particular trait values – those associated with benthic habitats and prey capture. While previous work on fish communities has found that species richness is positively correlated with ecosystem function, our results instead highlight the capacity for regionally prevalent and locally dominant species to drive ecosystem function in moderately diverse communities. We discuss these alternate links between community composition and ecosystem function and consider their divergent implications for ecosystem valuation and conservation prioritization.

Fish community structure, habitat complexity, and soundscape characteristics of patch reefs in a tropical, back-reef system

2019 ◽  
Vol 609 ◽  
pp. 33-48 ◽  
Author(s):  
RP Lyon ◽  
DB Eggleston ◽  
DR Bohnenstiehl ◽  
CA Layman ◽  
SW Ricci ◽  
...  
Keyword(s):  
Community Structure ◽  
Habitat Complexity ◽  
Fish Community ◽  
Back Reef ◽  
Fish Community Structure ◽  
Patch Reefs ◽  
Reef System

Dissolved oxygen and temperature best predict deep-sea fish community structure in the Gulf of California with climate change implications

2020 ◽  
Vol 637 ◽  
pp. 159-180
Author(s):  
ND Gallo ◽  
M Beckwith ◽  
CL Wei ◽  
LA Levin ◽  
L Kuhnz ◽  
...  
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Community Composition ◽  
Environmental Conditions ◽  
Deep Sea ◽  
Gulf Of California ◽  
Fish Community ◽  
Demersal Fish ◽  
Fish Community Structure ◽  
Explained Variance

Natural gradient systems can be used to examine the vulnerability of deep-sea communities to climate change. The Gulf of California presents an ideal system for examining relationships between faunal patterns and environmental conditions of deep-sea communities because deep-sea conditions change from warm and oxygen-rich in the north to cold and severely hypoxic in the south. The Monterey Bay Aquarium Research Institute (MBARI) remotely operated vehicle (ROV) ‘Doc Ricketts’ was used to conduct seafloor video transects at depths of ~200-1400 m in the northern, central, and southern Gulf. The community composition, density, and diversity of demersal fish assemblages were compared to environmental conditions. We tested the hypothesis that climate-relevant variables (temperature, oxygen, and primary production) have more explanatory power than static variables (latitude, depth, and benthic substrate) in explaining variation in fish community structure. Temperature best explained variance in density, while oxygen best explained variance in diversity and community composition. Both density and diversity declined with decreasing oxygen, but diversity declined at a higher oxygen threshold (~7 µmol kg-1). Remarkably, high-density fish communities were observed living under suboxic conditions (<5 µmol kg-1). Using an Earth systems global climate model forced under an RCP8.5 scenario, we found that by 2081-2100, the entire Gulf of California seafloor is expected to experience a mean temperature increase of 1.08 ± 1.07°C and modest deoxygenation. The projected changes in temperature and oxygen are expected to be accompanied by reduced diversity and related changes in deep-sea demersal fish communities.

Fish community and fisheries management of Brno Reservoir following revitalisation measures

2015 ◽  
Vol 64 (2) ◽  
pp. 112-122 ◽  
Author(s):  
Pavel Jurajda ◽  
Zdeněk Adámek ◽  
Zdenka Valová ◽  
Michal Janáč ◽  
Kevin Roche
Keyword(s):  
Fisheries Management ◽  
Fish Community
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