Simulation of flow and habitat conditions under ice, Cache la Poudre River - January 2006

2007 ◽  
Author(s):  
Terry Waddle
Keyword(s):  
Habitat Conditions ◽  
Cache La Poudre River

SEEDING DENSITY OF DIFFERENT FISH SPECIES IN POLYCULTURE

2017 ◽  
pp. 74-79
Author(s):  
Yuriy Borisovich Lvov
Keyword(s):  
Fish Species ◽  
Silver Carp ◽  
Seeding Density ◽  
Habitat Conditions ◽  
Method Of Calculation ◽  
Fish Breeding ◽  
Trophic Preferences ◽  
Breeding Zone ◽  
Practical Progress

The article touches upon the principles, biological basics and practical progress of introduction of specific and age polyculture of fishes. Using the results of the analysis of literary and long-term native data, there has been offered the gradation of 12 fish species from different families by resistance to habitat conditions. Crucian ( Carassius gibelio ) has been chosen as the most sustainable object of cultivation. There has been taken an attempt to calculate the number of seeding different fish species in polyculture taking into account their physiological features is made. Subject to specific physiological features of the studied species, there was carried out recalculation of their natural reproductive performance in different fish-breeding zones, which is traditionally carried out for a carp ( Cyprinus carpio ). In particular, in the second fish-breeding zone with area of 1 hectare it is possible to breed 120 kg of carp, or 150 kg of crucian, or 75 kg of silver carp ( Hypophthalmichthys ). Overall productivity is made up of a share of fishes in polyculture, but taking into account tolerance of species, it can be lower than productivity calculated for carp. The method of calculation and formulas which give the chance to determine seeding density of fish species for breeding in polyculture have been offered. This technique makes it possible to use trophic preferences and consider tolerance of each species to the conditions of breeding areas.

Species Diversity in Grassland Communities Under Different Habitat Conditions

2009 ◽  
Vol 24 (1) ◽  
pp. 43-59
Author(s):  
Magdalena Jastrzębska ◽  
Tadeusz Szarejko ◽  
Czesław Hołdyński ◽  
Wiesław Piotr Jastrzębski
Keyword(s):  
Species Diversity ◽  
Habitat Conditions ◽  
Grassland Communities

Measuring stream habitat conditions: Can remote sensing substitute for field data?

2021 ◽  
pp. 147617
Author(s):  
Karina Dias-Silva ◽  
Thiago Bernardi Vieira ◽  
Talissa Pio de Matos ◽  
Leandro Juen ◽  
Juliana Simião-Ferreira ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Field Data ◽  
Stream Habitat ◽  
Habitat Conditions

scholarly journals Characteristics of Liparis loeselii (L.) Rich. populations in selected Natura 2000 areas in eastern Poland

2020 ◽  
Vol 55 (3) ◽  
pp. 151-162
Author(s):  
Danuta Urban ◽  
Joanna Sender ◽  
Ewelina Tokarz ◽  
Andrzej Różycki
Keyword(s):  
Natura 2000 ◽  
Total Carbon ◽  
Habitat Conditions ◽  
Total Carbon Content ◽  
Poor Fen ◽  
Calcareous Fen ◽  
Liparis Loeselii ◽  
The Individual ◽  
Insight Into

AbstractIn view of the sensitivity of Liparis loeselii to changes in habitat conditions, we carried out a study with the aim to monitor population numbers, identify the individual features of the Liparis loeselii population, analyse habitat conditions, identify threats and propose conservation measures to preserve the species. The investigations were conducted in seven unmanaged objects located in three Natura 2000 areas in eastern Poland. The results of this study provide a new insight into Liparis loeselii ecology. The analysed populations inhabited some habitat types: extremely poor fen, transitional mire, rich fen, calcareous fen, spring-fed fen. The content of nutrients was similar in all the habitats. A CCA analysis revealed that the total carbon content, pH, and redox potential of the substrate determine differences between the habitats analysed. Juvenile individuals represented a maximum of 12% of the analysed populations and were the least abundant group of these plants. The flowering was primarily influenced by hydrological conditions. Based on the long-term observations reported in this article, it can be assumed that the species stands a chance of surviving at the localities analysed, provided that the habitat conditions do not change dramatically.

Effects of extreme habitat conditions on otolith morphology – a case study on extremophile livebearing fishes (Poecilia mexicana, P. sulphuraria)

Zoology ◽  
2011 ◽  
Vol 114 (6) ◽  
pp. 321-334 ◽  
Author(s):  
Tanja Schulz-Mirbach ◽  
Rüdiger Riesch ◽  
Francisco J. García de León ◽  
Martin Plath
Keyword(s):  
Habitat Conditions ◽  
Poecilia Mexicana ◽  
Otolith Morphology ◽  
Extreme Habitat

scholarly journals The impact of spatial isolation and local habitat conditions on colonization of recent forest stands by ectomycorrhizal fungi

2018 ◽  
Vol 429 ◽  
pp. 84-92 ◽  
Author(s):  
Margaux Boeraeve ◽  
Olivier Honnay ◽  
Nele Mullens ◽  
Kris Vandekerkhove ◽  
Luc De Keersmaeker ◽  
...  
Keyword(s):  
Ectomycorrhizal Fungi ◽  
Habitat Conditions ◽  
Forest Stands ◽  
Spatial Isolation ◽  
The Impact ◽  
Local Habitat

Population characteristics of Oreochromis niloticus (Linnaeus, 1758) in light of varying water quality conditions of adjoined Lakes Naivasha and Oloidien in Kenya

2020 ◽  
Vol 01 (01) ◽  
pp. 54-71
Author(s):  
Alice Mutie ◽  
◽  
Edna Waithaka ◽  
George Morara ◽  
Priscilla Boera ◽  
...  
Keyword(s):  
Water Quality ◽  
Oreochromis Niloticus ◽  
Quality Parameters ◽  
Population Characteristics ◽  
Lake Naivasha ◽  
Habitat Conditions ◽  
Relationship Analysis ◽  
Relative Condition Factor ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Main Lake

Nile tilapia Oreochromis niloticus (L.) is a recent re-introduction in Lake Naivasha and is one of the fish species that has crossed into Lake Oloidien. This study assessed and compared the population characteristic of O. niloticus under different physicochemical conditions of water in L. Naivasha (main) and L. Oloidien. Samples of water for selected water quality parameters and fisheries data from catch survey were collected between 2017 and 2018. Results indicate the highest conductivity levels recorded in 2018 as 2916 ±11.30 µScm-1 and 282.33 ± 4.33 µScm-1 for L. Oloidien and L. Naivasha respectively. Mean total lengths of O. niloticus were 19.1± 1.8 cm and 23.6 ± 2.9 cm for L. Oloidien and L. Naivasha respectively. Mean weight of O. niloticus was 129.3 ± 37.8 g in L. Oloidien and 260.9 ± 81.0 g in L. Naivasha. Length-weight relationship analysis showed a negative allometric growth (b = 2.526) and (b = 2.983; p > 0.05) in lakes Oloidien and Naivasha respectively. The relative condition factor (Kn) values were slightly lower in O. niloticus from L. Oloidien compared to the main Lake. Differences between the two lakes in the population characteristics of O. niloticus may be attributed to the observed differences in the habitat conditions, including the conductivity and pH levels.

Sign in / Sign up

Export Citation Format

Share Document