Percid Habitat: The River Analogy

1977 ◽  
Vol 34 (10) ◽  
pp. 1936-1940 ◽  
Author(s):  
James F. Kitchell ◽  
Murray G. Johnson ◽  
C. Kenneth Minns ◽  
Kenneth H. Loftus ◽  
Lorne Greig ◽  
...  
Keyword(s):  
Key Words ◽  
Environmental Conditions ◽  
Current Velocity ◽  
Perca Flavescens ◽  
Light Penetration ◽  
Habitat Conditions ◽  
Reproductive Patterns ◽  
Evolutionary Origins ◽  
Reduced Light ◽  
Growth And Reproduction

We propose that the optimum habitat of the percid fishes Perca flavescens, P. fluviatilis, Stizostedton vitreum vitreum, and S. lucioperca in lakes may be defined by the littoral and sublittoral environmental conditions equivalent to those in large, temperate rivers. Analogous habitat conditions include sand or gravel substrate, low current velocity, reduced light penetration (Stizostedion spp. only), temperatures optimal for growth and reproduction, and well-oxygenated spawning substrates. The species' evolutionary origins and reproductive patterns also reflect their riverine ancestral habitat. Evidence in support of the hypothesis is derived from the diversity of papers contributed to the PERCIS Symposium. Key words: Percidae, habitat, theory, Perca, Stizostedion

scholarly journals Physiological and ecological consequences of the water optical properties degradation on reef corals

Coral Reefs ◽  
2021 ◽  
Author(s):  
Tomás López-Londoño ◽  
Claudia T. Galindo-Martínez ◽  
Kelly Gómez-Campo ◽  
Luis A. González-Guerrero ◽  
Sofia Roitman ◽  
...  
Keyword(s):  
Optical Properties ◽  
Population Decline ◽  
Light Availability ◽  
Potential Effect ◽  
Optical Quality ◽  
Light Penetration ◽  
Reef Corals ◽  
Orbicella Faveolata ◽  
Light Quantity ◽  
Reduced Light

AbstractDegradation of water optical properties due to anthropogenic disturbances is a common phenomenon in coastal waters globally. Although this condition is associated with multiple drivers that affect corals health in multiple ways, its effect on light availability and photosynthetic energy acquisition has been largely neglected. Here, we describe how declining the water optical quality in a coastal reef exposed to a turbid plume of water originating from a man-made channel compromises the functionality of the keystone coral species Orbicella faveolata. We found highly variable water optical conditions with significant effects on the light quantity and quality available for corals. Low-light phenotypes close to theoretical limits of photoacclimation were found at shallow depths as a result of reduced light penetration. The estimated photosynthetically fixed energy depletion with increasing depth was associated with patterns of colony mortality and vertical habitat compression. A numerical model illustrates the potential effect of the progressive water quality degradation on coral mortality and population decline along the depth gradient. Collectively, our findings suggest that preserving the water properties seeking to maximize light penetration through the water column is essential for maintaining the coral reef structure and associated ecosystem services.

On the distribution of the Arctic endemic alga Laminaria solidungula (Laminariales) in the White Sea

2021 ◽  
Vol 55 (2) ◽  
pp. 325-333
Author(s):  
T. A. Mikhaylova
Keyword(s):  
Global Warming ◽  
Environmental Conditions ◽  
Brown Alga ◽  
White Sea ◽  
The Arctic ◽  
The White Sea ◽  
Anatomical Features ◽  
Growth And Reproduction

The morphological and anatomical features of the specimens of the brown alga Laminaria solidungula collected in the White Sea are provided. Environmental conditions for the growth and reproduction of this species in the White Sea are analyzed. The probable timing of penetration of this species into the White Sea and possible scenarios of changes in its distribution in response to global warming are discussed.

scholarly journals Effects of canopy-mediated abrasion and water flow on the early colonisation of turf-forming algae

2007 ◽  
Vol 58 (7) ◽  
pp. 657 ◽  
Author(s):  
Bayden D. Russell
Keyword(s):  
Water Flow ◽  
Interactive Effects ◽  
Light Penetration ◽  
Physical Processes ◽  
Percentage Cover ◽  
Negative Effect ◽  
Flow Through ◽  
Per Se ◽  
Reduced Light ◽  
Reduced Water

Algal canopies form predictable associations with the benthic understorey, and canopy-mediated processes may maintain these associations. Three canopy-mediated processes that are inherently linked are water flow through a canopy, abrasion of the substrate by the canopy, and light penetration. These processes were experimentally reduced to test the hypotheses that turf-forming algae would be: (1) positively affected by reduced abrasion by kelp canopies; (2) positively affected by reduced water flow; and (3) negatively affected by shading (reduced light). Biomass of turf-forming algae was greater when abrasion was reduced, but less when light was reduced. In contrast to predictions, reduced water flow had a negative effect on the percentage cover and biomass of turf-forming algae, rejecting the second hypothesis. It seems, however, that this negative effect was caused by an increase in shading associated with reduced canopy movement, not a reduction of water flow per se. None of the factors accounted for all of the change seen in understorey algae, indicating that it is important to study the interactive effects of physical processes.

scholarly journals Podilya environmental conditions variety as a tourism development stimulation factor

2014 ◽  
pp. 237-244
Author(s):  
A. Kizun
Keyword(s):  
Key Words ◽  
Environmental Conditions ◽  
Tourism Development ◽  
Forest Steppe ◽  
Multiple Functions ◽  
Regional Characteristics ◽  
Spiritual Recovery

Regional characteristics and diversity of Podiliya environmental conditions are considered, and there is shown that they were favorable to the settlement processes and performed multiple functions at all stages of history, one of which is the ability to use environmental conditions diversity as a source of physical and spiritual recovery. Special attention is given to the Podiliya landscapes formation, as one of the attraction factors. Key words: environmental conditions, landscape, tourism, recreation, region, forest-steppe.

scholarly journals Its present state overmoistened landscape systems of Lviv Region

2014 ◽  
pp. 347-354
Author(s):  
N. Blazhko
Keyword(s):  
Key Words ◽  
Present State ◽  
Environmental Conditions ◽  
Ecological Status ◽  
Ecological Condition ◽  
Wetland Landscape ◽  
Current State ◽  
Destabilizing Factors ◽  
Good Ecological Status ◽  
Stabilizing Factors

Reviewed the current state of wetland landscape systems (PLC) Lviv region. Highlighted areas PLC of good ecological status, with a satisfactory ecological condition and unsatisfactory environmental conditions. Key words: overmoistened landscape systems (OLS)peat, peat, drainage improvement, environmental stabilizing factors, environmental destabilizing factors.

scholarly journals Genome analyses of a placozoan rickettsial endosymbiont show a combination of mutualistic and parasitic traits

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kai Kamm ◽  
Hans-Jürgen Osigus ◽  
Peter F. Stadler ◽  
Rob DeSalle ◽  
Bernd Schierwater
Keyword(s):  
Amino Acids ◽  
Environmental Conditions ◽  
Metabolic Pathways ◽  
Essential Amino Acids ◽  
Intracellular Bacteria ◽  
The Novel ◽  
Symbiotic Relationships ◽  
Genome Analyses ◽  
Growth And Reproduction

AbstractSymbiotic relationships between eukaryotic hosts and bacteria range from parasitism to mutualism and may deeply influence both partners’ fitness. The presence of intracellular bacteria in the metazoan phylum Placozoa has been reported several times, but without any knowledge about the nature of this relationship and possible implications for the placozoan holobiont. This information may be of crucial significance since little is known about placozoan ecology and how different species adapt to different environmental conditions, despite being almost invariable at the morphological level. We here report on the novel genome of the rickettsial endosymbiont of Trichoplax sp. H2 (strain “Panama”). The combination of eliminated and retained metabolic pathways of the bacterium indicates a potential for a mutualistic as well as for a parasitic relationship, whose outcome could depend on the environmental context. In particular we show that the endosymbiont is dependent on the host for growth and reproduction and that the latter could benefit from a supply with essential amino acids and important cofactors. These findings call for further studies to clarify the actual benefit for the placozoan host and to investigate a possible role of the endosymbiont for ecological separation between placozoan species.

scholarly journals Impacts of Forest Thinning and White-Tailed Deer Herbivory on Translocation of the Rare Terrestrial Orchid Platanthera integrilabia

Diversity ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 412
Author(s):  
Savanna Wooten ◽  
Geoff Call ◽  
Adam Dattilo ◽  
Jennifer Cruse-Sanders ◽  
Jennifer Nagel Boyd
Keyword(s):  
Habitat Management ◽  
Light Availability ◽  
Habitat Conditions ◽  
Viable Option ◽  
Terrestrial Orchid ◽  
Orchid Species ◽  
Deer Herbivory ◽  
Historical Distribution ◽  
New Occurrences ◽  
Growth And Reproduction

Translocation is increasingly being used to supplement existing occurrences and establish new occurrences of rare plant species, but translocation success is dependent on understanding responses to habitat conditions and management. Platanthera integrilabia (white fringeless orchid) is a rare terrestrial orchid species presently found in mostly small occurrences that comprise a fraction of its historical distribution and abundance in the southeastern United States. We investigated the influence of shade and white-tailed deer herbivory, as cited concerns for this species, on the early success of its translocation from tubers as determined through measures of emergence, survival, growth, and reproduction of two cohorts. Our findings suggest that translocation from tubers could be a viable option to assist the conservation of P. integrilabia relative to its propagation from seed, but that low early emergence, survival, and flowering rates should be considered in translocation plans. Our results also indicate that translocation and ongoing habitat management should consider the potential for light availability to differentially impact distinct plant life stages and influence deer herbivory. We recommend that additional translocation studies designed to investigate the influence of site conditions on outcomes could improve the success of such efforts as well as inform the management of extant occurrences.

Growth and reproduction of Donax trunculus from the Gulf of Annaba (Northeast Algeria) in relation to environmental conditions

2020 ◽  
Vol 27 (33) ◽  
pp. 41656-41667
Author(s):  
Amel Hamdani ◽  
Noureddine Soltani ◽  
Nedjoua Zaidi
Keyword(s):  
Environmental Conditions ◽  
Donax Trunculus ◽  
Growth And Reproduction

scholarly journals INFLUENCE OF DIETARY CALCIUM-PHOSPHORUS LEVELS ON APPARENT ABSORPTION OF MINERALS AND NITROGEN DURING GROWTH AND REPRODUCTION IN GILTS

1984 ◽  
Vol 64 (2) ◽  
pp. 491-494
Author(s):  
R. R. GRANDHI
Keyword(s):  
Key Words ◽  
Dietary Calcium ◽  
Nutrient Absorption ◽  
Nitrogen Absorption ◽  
Apparent Absorption ◽  
Key Words Calcium ◽  
Calcium Phosphorus ◽  
Phosphorus Levels ◽  
Growth And Reproduction

A higher Ca-P intake during finishing, gestation and lactation periods increased (P < 0.05) the apparent absorption (g/day) of Ca and P during all three periods. Nutrient absorption appeared to differ for Lacombe and Yorkshire gilts. Key words: Calcium, phosphorus, nitrogen, absorption, gilts

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