scholarly journals Effects of temperature patterns on the spawining phenology and niche overlap of fish assemblages in the water bodies of the Dnipro River basin

2019 ◽  
Vol 22 ◽  
pp. 177-203
Author(s):  
Olexandr V. Zhukov ◽  
Dmytro L. Bondarev ◽  
Yuliia I. Yermak ◽  
Marina P. Fedushko
Keyword(s):  
Water Temperature ◽  
River Basin ◽  
Fish Assemblages ◽  
Habitat Type ◽  
Perca Fluviatilis ◽  
Niche Overlap ◽  
Rutilus Rutilus ◽  
Fourth Degree ◽  
Scale Temperature ◽  
Sinusoidal Waveform

The effect of the temperature on the spawining phenology of the fish assemblages and the role of the exogenious and endogenious factors in temporal niche overlaping of fish assemblages were investigated in different water body types of the Dnipro River basin within the “Dnipro-Orilskiy" Nature Reserve (Ukraine in the years 1997-2018. The period of spawning (beginning and end) of the Blicca bjoerkna, Carassius gibelio, Scardinius erythrophthalmus, Abramis brama, Perca fluviatilis, Rutilus rutilus, and Esox lucius was estimated. Community niche overlap was estimated by calculating the pairwise Pianka index. The temperature was discused as an exogenous factor effecting on the fishes spawn timing. From 1998 to 2018 the average temperature in the study area continued to rise. The annual course of the temperature takes the sinusoidal waveform, which can be described by a fourth-degree polynomial. The residuals of the corresponding polynomial trend are specific for each year. The regular components of the residuals variation were revealed by dbMEM-variables. Fishes spawning occurred within the narrow water temperature ranges, which are specific for each fish species. There are statistically significant differences between ponds in water temperatures at which the spawning start occurred. The water temperature at which the spawning start occurred is linearly dependent on the time of the spawning start. There were temporal overlaps between spawning of the different species. The deviation of the Pianka mean niche overlap indexes from random alternatives does not depend on the habitat type. The decreasing trend of the Pianka mean niche overlap indexes was observed during the study period. There is no statistically significant correlation between the average annual air temperature and the level of the niche overlap. The degree of niche overlapping depends on broad-, medium-, and fine-scale temperature patterns.

Headwater–river gradient: trait-based approaches show functional dissimilarities among tropical fish assemblages

2018 ◽  
Vol 69 (4) ◽  
pp. 574 ◽  
Author(s):  
Rodrigo Assis de Carvalho ◽  
Francisco Leonardo Tejerina-Garro
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Functional Traits ◽  
Fish Assemblages ◽  
Habitat Type ◽  
River Mouth ◽  
Environmental Variable ◽  
Tropical Fish ◽  
River Continuum ◽  
Continuum Concept

Traditionally, species richness and composition of freshwater communities are expected to change according to the structural variation from headwaters to river mouth. In the present study, we hypothesised that fish functional traits will respond to this gradient, leading to functional dissimilarities between fish assemblages of headwaters and those of rivers. We addressed the following questions: (1) which functional traits are present in fish assemblages of each habitat type; (2) which environmental factors determine the occurrence of fish functional traits; and (3) how functional traits are related to each environmental variable? Our findings showed dissimilarities between fish assemblages of headwaters and those of rivers, mainly driven by channel depth, channel width, water temperature, water turbidity and concentration of dissolved oxygen, whereas altitude, water temperature and pH were mainly correlated with variation within each habitat type. These results suggested that not only do the physical variables proposed in classical theory of the river-continuum concept follow the upstream–downstream gradient in structuring the functional organisation of fish assemblages, but that also physicochemical variables, such as turbidity and concentration of dissolved oxygen, display this trend in tropical river systems. Moreover, our results have given a first perspective on what kind of fish species and fish functional traits to expect in each habitat type and, consequently, along the headwater–river mouth gradient.

scholarly journals Differences in the diet of breeding Cormorants Phalacrocorax carbo sinensis in an inland colony: the effect of years, breeding stages and locations within the colony

2018 ◽  
Vol 18 (4) ◽  
pp. 149-156
Author(s):  
Simone Buttu ◽  
Giulia Atzori ◽  
Francesco Palmas ◽  
Robert Gwiazda
Keyword(s):  
Fish Species ◽  
Fish Assemblages ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Colony Development ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis ◽  
Different Seasons ◽  
The Impact

AbstractA study of the diet of the Great Cormorant Phalacrocorax carbo sinensis (fish species and size) in (1) different seasons (years), (2) breeding stages (incubation and chick rearing), and (3) breeding areas (center and edge) in the colony in the Dzierżno-Duże Reservoir (southern Poland) was carried out. Overall, 147 pellets of the Great Cormorant were analysed. The low values of the indexes of Levin (Bi) and Shannon (H’) showed a limited trophic spectrum in the diet of the Great Cormorant. Roach (Rutilus rutilus) with a percentage index of relative importance (%IRI) of 62.89, perch (Perca fluviatilis) (%IRI = 22.63) and carp (Cyprinus carpio) (%IRI = 10.43), were the most common prey. Evident changes in the diet between 2003 and 2014, with less roach and more perch and ruffe in 2014 were found. They could be probably related to changes in the fish community. Differences in the food of cormorants between breeding stages reflected dietary requirements of the chicks. During the breeding season younger chicks require feeding with smaller fish than older chicks. The proportion of fish species found in the cormorant diet differed between the edge and the centre of the colony. We concluded that the impact of Great Cormorants on native fish assemblages may be dependent on the location within the colony, development state of the chicks and season, not just fish availability.

Comparison of Deep-River and Adjacent Sandy-Beach Fish Assemblages in the Napo River Basin, Eastern Ecuador

Copeia ◽  
2002 ◽  
Vol 2002 (2) ◽  
pp. 333-343 ◽  
Author(s):  
Donald J. Stewart ◽  
Myriam Ibarra ◽  
Ramiro Barriga-Salazar
Keyword(s):  
River Basin ◽  
Sandy Beach ◽  
Fish Assemblages

scholarly journals Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)

1998 ◽  
Vol 41 (3) ◽  
pp. 309-314 ◽  
Author(s):  
Yoshimi Sato ◽  
Nelsy Fenerich-Verani ◽  
José Roberto Verani ◽  
Hugo Pereira Godinho ◽  
Edson Vieira Sampaio
Keyword(s):  
Body Weight ◽  
Water Temperature ◽  
River Basin ◽  
Fertilization Rate ◽  
Pituitary Extract ◽  
Reproductive Characteristics ◽  
Sao Francisco River ◽  
Absolute Fecundity ◽  
São Francisco River

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

Changes in Fish Assemblages, Solomon River Basin, Kansas: Habitat Alterations, Extirpations, and Introductions

2002 ◽  
Vol 105 (3 & 4) ◽  
pp. 178-192 ◽  
Author(s):  
Mark E. Eberle ◽  
Eric G. Hargett ◽  
Thomas L. Wenke ◽  
Nicholas E. Mandrak
Keyword(s):  
River Basin ◽  
Fish Assemblages ◽  
Habitat Alterations

scholarly journals A Comparison of Fishes and Invertebrates Living in the Vicinity of Energized and Unenergized Submarine Power Cables and Natural Sea Floor off Southern California, USA

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Milton S. Love ◽  
Mary M. Nishimoto ◽  
Linda Snook ◽  
Donna M. Schroeder ◽  
Ann Scarborough Bull
Keyword(s):  
Southern California ◽  
Statistical Difference ◽  
Fish Assemblages ◽  
Natural Habitat ◽  
Habitat Type ◽  
Aquatic Organisms ◽  
Power Cables ◽  
Sea Floor ◽  
Total Fish ◽  
Species Groups

Increasing reliance on deep-water renewable energy has increased concerns about the effects of the electromagnetic fields (EMFs) generated by submarine power cables on aquatic organisms. Off southern California, we conducted surveys of marine organisms living around energized and unenergized submarine power cables and nearby sea floor during 2012–2014 at depths between 76 and 213 m. In general, EMFs declined to background levels about one meter from the cable. We found no statistical difference in species composition between the fish assemblages along the energized and unenergized cables. The natural habitat community statistically differed from both energized and unenergized cable communities. Within species (or species groups), we found no differences in densities between energized and unenergized cables. Total fish densities were significantly higher around the cables than over the natural habitat. We found that invertebrate communities were structured by habitat type and depth and, similar to the fishes, there was no statistical difference between the energized and unenergized cables. Individually, the densities of four invertebrate species or species groups (Metridium farcimen, Luidia spp., unidentified black Crinoidea, and Urticina spp.) differed between energized and unenergized cables, but this difference was not significant across all depth strata. The invertebrate community inhabiting the natural habitat strongly differed from the energized and unenergized cable community exhibiting the fewest species and individuals.

Structure of endemic fish assemblages in the upper Yangtze River Basin

2011 ◽  
Vol 27 (1) ◽  
pp. 59-75 ◽  
Author(s):  
Yongfeng He ◽  
Jianwei Wang ◽  
Sovan Lek ◽  
Wenxuan Cao ◽  
Sithan Lek-Ang
Keyword(s):  
River Basin ◽  
Yangtze River ◽  
Fish Assemblages ◽  
Yangtze River Basin ◽  
Upper Yangtze River ◽  
Endemic Fish ◽  
The Upper Yangtze River
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