scholarly journals Ekologi dan Kelimpahan Ikan Sentani Gudgeon (Oxyeleotris heterodon, Weber 1908) dan Snakehead Gudgeon (Giuris margaritacea, Valenciennes 1837) di Danau Sentani, Papua

2019 ◽  
Vol 11 (1) ◽  
pp. 24-32
Author(s):  
Henderite L. Ohee ◽  
Gerardinalia Ngamelubun ◽  
Joane J. Ansaka ◽  
Novela H. Korwa ◽  
Puguh Sujarta
Keyword(s):  
Native Species ◽  
Fish Abundance ◽  
Lake Area ◽  
Substrate Type ◽  
Habitat Depth ◽  
Dense Water ◽  
Substrate Preferences ◽  
Type Water ◽  
Freshwater Community ◽  
Water Vegetation

Freshwater community in Lake Sentani comprise of 35 species including three endemic species, seven native species, eight anadromous fish and 17 introduced species. Two native species are Sentani Gudgeon (Oxyeleotris heterodon) and Snakehead Gudgeon (Giuris margaritacea). The survey aims to document the ecology and fish abundance of the gudgeons in Lake Sentani. Fish sampling was done passively by using gill nets with three different mesh sizes in five locations; Puai, Enandowai, Waena, Ayapo and Yahim. Substrate type, water vegetations, habitat depth and fish abundance were recorded each locations. Substrate preferences of the gudgeons are sand, mud and gravel, while O. heterodon was more abundance in sand mud substrate type. Moreover, water vegetation preference was different between O. heterodon and G. margaritacea. Sentani Gudgeon prefer habitat with dense water vegetations, while G. margaritaceus could be found in habitat with or without water vegetation. Theses two gudgeons were found in relatively the same habitat depth, up to 7 meters depth. O. heterodon and G. margaritacea had a very low abundance in the lake. It is important to conserve lake area from the edge  up to 7 meter depth that consist of sand, mud and gravel substrate types and dense water vegetation to ensure the population of these two gudgeons are abundance in Lake Sentani.   Key words: Ecology, Lake Sentani, relative abundance, O. heterodon, G. margaritacea.

scholarly journals Additions to the Flora of the Continental Northwest Territories from the Great Slave Lake Area

2005 ◽  
Vol 119 (3) ◽  
pp. 437
Author(s):  
Paul M. Catling
Keyword(s):  
Northwest Territories ◽  
Native Species ◽  
Achillea Millefolium ◽  
Lake Area ◽  
Distinctive Features ◽  
Botanical Exploration ◽  
Galium Aparine ◽  
Great Slave Lake ◽  
Sonchus Arvensis ◽  
Eleven Species

Eleven species are reported as new to the flora of the continental Northwest Territories. The new native species include Artemesia dracunculus, Chenopodium leptophyllum, Eleocharis erythropoda, Panicum capillare, Schoenoplectus pungens and Symphyotrichum lanceolatum subsp. hesperium var. hesperium. New alien species reported include Achillea ptarmica, Chaenorhinum minus, Galium aparine, Malva neglecta and Silene cserei. Sonchus arvensis, previously reported, is based on material referable to a subsp. uliginosus. Forms new to the flora include Achillea millefolium f. rosea and Actaea rubra f. neglecta. Locations, habitats and distinctive features are provided for the additional taxa. The Hay River lowland ecoregion is a floristically rich area that deserves more botanical exploration. Erratum included.

scholarly journals Does seed aggrupation and substrate type affect the germination on three native species of Durango, Mexico?

Phyton ◽  
2018 ◽  
Vol 87 (1) ◽  
pp. 252-259
Author(s):  
S醤chez J ◽  
J S醗nz Mata ◽  
J Flores ◽  
E Jurado ◽  
E Estrada Castill髇 ◽  
...  
Keyword(s):  
Native Species ◽  
Substrate Type

scholarly journals Fish community structure of Juramento reservoir, São Francisco River basin, Minas Gerais, Brazil

2006 ◽  
Vol 23 (3) ◽  
pp. 832-840 ◽  
Author(s):  
André R. M. Silva ◽  
Gilmar B. Santos ◽  
Thiago Ratton
Keyword(s):  
Community Structure ◽  
Native Species ◽  
Fish Community ◽  
Fish Fauna ◽  
Fish Abundance ◽  
Fish Community Structure ◽  
Migratory Species ◽  
Wet Season ◽  
Dry Period ◽  
The Relationship

Many rivers in Brazil as the São Francisco (SFR) have been impounded for reservoirs construction purposes. However, there is a lack of knowledge on their fish fauna in many areas, including headwaters. The present study aimed to describe the fish community structure from Juramento reservoir, located on Juramento River, a branch of SFR basin. Six bimonthly samplings were made in four different sites. Gill and cast nets, beach seines and sieves were used to collect fish. Ecological indexes as well as the relationship between fish abundance and some limnological variables were determined. 3288 fish belonging to 33 species (16.5% of the total described for SFR basin) were captured, being 75.7% Characiformes, 18.1% Siluriformes, 3% Cyprinodontiformes and 3% Gymnotiformes. Only two non-native species, 'tamboatá' - Hoplosternum littorale (Hancock, 1828) and 'trairão' - Hoplias lacerdae Ribeiro, 1908 were found. The highest catches in number occurred in the dry period (March-October) and the lowest one in the wet season (November-February). Diversity was higher at Barragem station and richness did not vary between reservoir zones. Five migratory species were found downstream of the dam (four exclusively there), whereas only the 'curimbatá-pioa' - Prochilodus costatus Valenciennes, 1850 occurred in the reservoir. The low observed correlations between fish abundance and the limnological variables utilized suggest that the local fish fauna is not strongly affected by their variation.

scholarly journals Variasi Morfologi dan Kemelimpahan Donax faba (Bivalvia: Donacidae) di Pantai Tengket Bangkalan Madura

2018 ◽  
Vol 2 (2) ◽  
pp. 73-84
Author(s):  
Dianah Filzan Alyani ◽  
Reni Ambarwati
Keyword(s):  
Substrate Type ◽  
Morphological Variations ◽  
Sandy Substrate ◽  
Water Ph ◽  
Belt Transect ◽  
Type Water ◽  
Taxonomic Studies ◽  
Substrate Ph ◽  
Water Acidity

Donax clams are important in taxonomic studies because they have many variations. The purposes of this study were to evaluate the morphological variations and the abundance of Donax clams; to analyze the habitat profiles of Donax clams at Tengket Bangkalan Madura Beach. The sample of clams were taken by belt transect method. The habitat profile was studied based on the substrate type, water acidity, substrate acidity, salinity and the temperature of water. The data was analyzed descriptive-quantitatively. The results showed that in Beach Tengket Madura found Donax faba which had 15 types. The most abundant variety was creamy with brown spots on the ventral and purplish white with brown spots. The profile of the habitat of D. faba in Tengket Beach was medium sandy substrate with water pH 6.7 and substrate pH 7, salinity 32.6-32.8‰, and temperature 32ᵒC.

scholarly journals Assessing Habitat Suitability for Native and Alien Freshwater Mussels in the River Waal (the Netherlands), Using Hydroacoustics and Species Sensitivity Distributions

2021 ◽  
Author(s):  
N. Y. Flores ◽  
F. P. L. Collas ◽  
K. Mehler ◽  
M. M. Schoor ◽  
C. K. Feld ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Water Depth ◽  
Habitat Suitability ◽  
Future Research ◽  
Suitable Habitat ◽  
Substrate Type ◽  
Species Sensitivity ◽  
Mussel Species ◽  
Type Water ◽  
Species Sensitivity Distributions

AbstractLongitudinal training dams (LTDs) in the river Waal are novel river training structures that protect the littoral zone from the adverse effects of navigation providing new habitats for riverine macroinvertebrates. In order to inform river management and to better understand their ecological value for native and alien mussel species, it is important to assess the habitat suitability of the protected LTD shore channels. We applied spatial hydroacoustics surveys consisting of side-scan sonar (SSS) and acoustic Doppler current profiler (ADCP) of the substrate type, water depth and flow velocity in three shore channels in combination with species sensitivity distributions (SSDs) to predict habitat suitability for native and alien mussel species. SSDs allowed for the prediction of habitat suitability as a potentially occurring fraction (POF) of a species pool. High substrate type, water depth, and near-bottom flow velocity POFs were found for ≥ 70%, 100%, and 4–51% of the total shore channel area, respectively, suggesting that shore channels provide suitable habitat for both native and alien mussel species. To enhance the shore channels as habitat for native mussel species, we recommend increasing shallow areas dominated by fine (silt/clay) and sand substrate types with low near-bottom flow velocities (near 0 m/s). In contrast, the total area of hard substrate (e.g., boulders) in the shore channels should be reduced as it strongly favored invasive alien mussel species in our study. Future research should include additional abiotic parameters to enhance the habitat suitability predictions and compare the results for different riverine habitats.

Correction of Relative Fish Abundance Estimates from Catch Data for Variable Fishing Intensity during Lake Surveys

1989 ◽  
Vol 46 (6) ◽  
pp. 1022-1025 ◽  
Author(s):  
P. M. Ryan ◽  
J. J. Kerekes
Keyword(s):  
Brook Trout ◽  
Unit Area ◽  
Fishing Effort ◽  
Fish Abundance ◽  
Lake Area ◽  
Catch Per Unit Effort ◽  
Fixed Amount ◽  
Catch Data ◽  
Abundance Estimates ◽  
Lake Size

Six small Newfoundland lakes were fished with gillnets over a 3–6 yr period in a manner typical of standard lake surveys where surveyors have a fixed amount of gear available, but lake size varies. Catch and effort data for brook trout (Salvelinus fontinalis) were examined for the purpose of selecting an appropriate measure of the relative abundance of trout. Fishing effort was not a function of lake area but fishing intensity or fishing effort per unit area varied inversely with lake area. Brook trout yield (kilograms per hectare) was positively related to fishing intensity Catch per unit effort (kilograms) of brook trout was inversely related to fishing intensity. Methods are suggested to correct for the bias in catch data resulting from variable fishing intensity during lake surveys and improve the recognition of differences in relative fish abundance.

scholarly journals Green Roof Substrate Type and Depth Affect the Growth of the Native Species Dianthus fruticosus Under Reduced Irrigation Regimens

HortScience ◽  
2011 ◽  
Vol 46 (8) ◽  
pp. 1208-1216 ◽  
Author(s):  
Panayiotis A. Nektarios ◽  
Ioannis Amountzias ◽  
Iro Kokkinou ◽  
Nikolaos Ntoulas
Keyword(s):  
Drought Stress ◽  
Native Species ◽  
Dry Weight ◽  
Green Roofs ◽  
Substrate Type ◽  
Drought Period ◽  
Substrate Moisture ◽  
Soilless Substrate ◽  
Substrate Depth ◽  
Extensive Green Roofs

Extensive green roofs are a promising technology for reintroducing lost flora in degraded urban environments, but further research is needed for their application in semiarid regions. Therefore, research was undertaken to determine the effects of substrate type and depth and the amount of irrigation during a drought period on the establishment, growth, and physiology of the native species Dianthus fruticosus sub. fruticosus. Treatments included two substrate types [a soilless substrate (Pum50:Per20:C20:Z10) or a substrate with soil (S15:Pum40:Per20:C20:Z5), in which Pum = pumice; Per = perlite; C = compost; Z = clinoptinolite zeolite; and S = sandy loam soil, mixed in a volumetric proportion indicated by their subscripts], two substrate depths (7.5 cm or 15.0 cm), and two irrigation regimens during drought [15% or 30% of pan evaporation (Epan)]. Measurements included substrate characteristics such as particle size distribution, dry and saturated bulk density, water characteristic curves, and in situ determination of substrate moisture during drought stress. Plant growth was determined based on biometric measurements such as growth index (GI) and dry weight and physiological indicators such as SPAD, chlorophylla+b, and carotenoid contents. It was found that substrate moisture during drought was increased in the soil substrate compared with the soilless substrate as a result of its better water retention capacity in low tensions. Dianthus fruticosus sub. fruticosus growth was promoted by the deep substrate (15 cm) throughout the entire study, whereas substrate type and irrigation during the drought period did not have an effect. Similarly, leaf dry weight was increased in the deeper substrates, whereas shoot and root dry weights were similar in all treatments. SPAD was found to be a more sensitive method than chlorophyll and carotenoid analysis and revealed an interesting sequence of treatment influences on D. fruticosus sub. fruticosus physiology that depended on the climatic conditions and stress imposition. More specifically, during establishment, both substrate type and depth affected growth with the soil substrate and deep profiles yielding higher SPAD measurements. Soon after the initiation of drought, the deep profiles had higher SPAD values than the shallow ones, whereas in high-irrigation regimens and, to a less extent, deeper profiles provided increased SPAD values after the middle of drought imposition. Chlorophyll and carotenoid levels reduced during the drought stress period, but very limited differences were detected between treatments. It was concluded that D. fruticosus sub. fruticosus is a very promising native plant for use on extensive green roofs in the Mediterranean region, and its growth was better in a substrate depth of 15 cm. However, its growth was sufficient even with a 7.5-cm substrate depth and irrigation of 15% Epan.

scholarly journals River Connectivity is Crucial for Safeguarding Biodiversity but May be Socially Overlooked. Insights From Spanish University Students

2021 ◽  
Vol 9 ◽  
Author(s):  
Elena Arboleya ◽  
Sara Fernández ◽  
Laura Clusa ◽  
Eduardo Dopico ◽  
Eva Garcia-Vazquez
Keyword(s):  
Species Richness ◽  
Functional Diversity ◽  
Native Species ◽  
Engineering Students ◽  
Educational Background ◽  
Freshwater Ecosystems ◽  
Fish Abundance ◽  
Fish Diversity ◽  
Nw Of Spain ◽  
Management Priorities

The social value of natural aquatic ecosystems is very important to set management priorities. River connectivity is essential for the conservation of freshwater ecosystems because barriers alter both abiotic conditions and the biotic communities, compromising biodiversity; however, the appreciation of this river feature has been insufficiently considered in socio-environmental studies that are mainly focused on the acceptance of new dams. Here we used a willingness to pay approach to estimate the value of connectivity, native species, fish diversity (measured as functional diversity or as species richness), fish abundance and environmental quality in three groups of students of different educational background in Asturias (NW of Spain). As in other studies where they are more sensitive to environmental issues, educational sciences students would pay more to conserve and improve river conditions than students of other disciplines. Connectivity was the least valued river feature by students of educational and natural sciences, and the third (before biodiversity and fish abundance) by engineering students. We measured the same features on lowland reaches of four coastal rivers in the Bay of Biscay, and applied declared will amounts to model their appreciation. Differences between the river ranks obtained from functional diversity (that changes with non-native species) and species richness, and small differences between students of different disciplines in the gap between most and least preferred rivers arise from the model. This indicates the importance to involve diverse stakeholder sectors in decisions about rivers. The importance of river connectivity in the conservation of local biodiversity should be explained to general public, perhaps through environmental campaigns.

scholarly journals Multidimensional niche differentiation might buffer invasion impacts: the case of oligohaline corophiids (Crustacea: Amphipoda) in the Baltic Sea

2021 ◽  
Author(s):  
Péter Borza ◽  
Kęstutis Arbačiauskas ◽  
Michael L. Zettler
Keyword(s):  
Native Species ◽  
Mesh Size ◽  
Character Displacement ◽  
Niche Differentiation ◽  
Niche Shift ◽  
Recent Theory ◽  
Amphipod Species ◽  
Substrate Preferences ◽  
The Stability ◽  
Filter Mesh

AbstractMultidimensional niche differentiation might increase the stability of coexistence by reducing overall niche overlap which might have implications on the dynamics of biological invasions. The oligohaline Baltic Seais inhabited by three native and one invasive corophiid amphipod species. These filter feeding crustaceans differ in their substrate preferences and salinity optima which could potentially allow their robust coexistence. However, recent theory predicts that competing species must diverge across all non-substitutable resources (e.g., food and space). We have measured the filter mesh size in the four species (i.e., the distance between bristles on the filtering setae), revealing considerable differences among the three natives (Apocorophium lacustre, Corophium multisetosum and C. volutator), whereas the invasive Chelicorophium curvispinum showed strong overlap with A. lacustre. Theory suggests that the four species cannot coexist robustly due to their overlap in food particle size irrespective of differences in their salinity optima and substrate preferences which is in accordance with observations of local extinctions of A. lacustre. Nevertheless, the stability ensuing from the multidimensional niche differentiation might delay competitive exclusion; i.e., the spatial separation by salinity and substrate types might decrease the intensity of competition for food. Our data for co-occurring populations indicate that A. lacustre might be able to decrease its filter mesh size overlap with C. curvispinum by character displacement and its broader salinity tolerance also might help the native species to persist in the region. However, the niche shift of the species might increase its overlap with C. multisetosum.

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