scholarly journals Community Response of Cladocera to Trophic Stress by Biomanipulation in a Shallow Oxbow Lake

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 929 ◽  
Author(s):  
Csaba Berta ◽  
Béla Tóthmérész ◽  
Marta Wojewódka ◽  
Olga Augustyniuk ◽  
János Korponai ◽  
...  
Keyword(s):  
Protected Area ◽  
Environmental Variables ◽  
Community Response ◽  
Oxbow Lake ◽  
Species Number ◽  
Top Down ◽  
Fish Introduction ◽  
Subfossil Cladocera ◽  
Recreational Area ◽  
Short Time

Studying contemporary and subfossil Cladocera (Crustacea) communities, we explored the effect of top-down stressors on the cladoceran communities; we are also interested in the coherence of the contemporary and subfossil communities. The studied Cibakháza oxbow lake is in E Hungary, on the left-floodplain of the River Tisza; it is a large, long, and shallow oxbow lake. Three areas of the oxbow lake were distinguished based on the strength of top-down stress: protected area with low top-down stress, biomanipulated area with high top-down stress, and recreational area with moderate top-down stress. Altogether, we identified 28 taxa in the contemporary and subfossil communities in the oxbow lake. We found that the species number of the contemporary Cladocera communities was lower (protected area: 13; biomanipulated area: 9, and recreational area: 14) than in the subfossil communities (protected area: 20; biomanipulated area: 16, and recreational area: 14). Among the environmental variables, we observed differences between the protected and biomanipulated area, while the recreational area showed a transition. Species number, abundances, and Simpson diversity also showed the effect of the fish introduction. There were no differences in beta-diversity among the contemporary and subfossil Cladocera community. The non-metric multidimensional scaling (NMDS) ordination showed that the biomanipulated area in the case of the contemporary communities was separated from the other areas, while in the case of the subfossil communities, there was no separation according to top-down stress. Our results showed that the number of species of contemporary Cladocera communities was lower in each area (3–10; 3–9; 5–9) compared to the subfossil communities (6–17; 7–12; 8–12). However, the highest abundances were found in the biomanipulated area due to the appearance of small-sized Cladocera species. Our findings suggest that the effect of a short-time fish introduction is restorable when the oxbow lake has a protected part.

Whose sustainability? Top–down participation and emergent rules in marine protected area management in Indonesia

Marine Policy ◽  
2010 ◽  
Vol 34 (6) ◽  
pp. 1215-1225 ◽  
Author(s):  
Marion Glaser ◽  
Wasistini Baitoningsih ◽  
Sebastian C.A. Ferse ◽  
Muhammad Neil ◽  
Rio Deswandi
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
Protected Area Management ◽  
Top Down ◽  
Area Management

scholarly journals Forest visitors’ opinion of recreational facilities and trails in forests in the Blaník Protected Landscape Area – a case study

2013 ◽  
Vol 59 (No. 5) ◽  
pp. 185-190
Author(s):  
A. Drábková ◽  
L. Šišák
Keyword(s):  
Protected Areas ◽  
Case Studies ◽  
Questionnaire Survey ◽  
Protected Area ◽  
Recreational Facilities ◽  
Recreational Area ◽  
Scarce Data

Currently, recreation is the most common use of protected areas and there are scarce data on the users and their opinion. The research was focused on visitors to the Blaník Protected Landscape Area (hereafter referred to as PLA), a well-known recreational area where data on visitors, important for PLA management, are missing. Therefore, the aim of the paper is find out: what kind of visitors comes to the study area; the type of forest trails and tourist facilities the visitors prefer. A questionnaire survey of forest visitors was used. Results show that the visitors mostly prefer maintained trails. According to forest visitors’ opinion, the most convenient facility to place near the forest tourist trail is the nature trail panels. Furthermore, based on the acquired data, it was possible to create a visitor’s profile which is important for respective research and other case studies in similar areas, and for managers of protected landscape areas to comply with both the visitors’ needs and the needs of the protected area.  

scholarly journals Cycles, trends, and residual variation in the Iberian sardine (Sardina pilchardus) recruitment series and their relationship with the environment

2011 ◽  
Vol 69 (5) ◽  
pp. 739-750 ◽  
Author(s):  
M. Begoña Santos ◽  
Rafael González-Quirós ◽  
Isabel Riveiro ◽  
José M. Cabanas ◽  
Carmela Porteiro ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Generalized Additive Models ◽  
Causal Link ◽  
Additive Models ◽  
Dynamic Factor ◽  
Sardina Pilchardus ◽  
Residual Variation ◽  
Stock Biomass ◽  
Spawning Stock ◽  
Short Time

Abstract Santos, M. B., González-Quirós, R., Riveiro, I., Cabanas, J. M., Porteiro, C., and Pierce, G. J. 2012. Cycles, trends, and residual variation in the Iberian sardine (Sardina pilchardus) recruitment series and their relationship with the environment. – ICES Journal of Marine Science, 69: 739–750. Recruitment variability is an important component of the dynamics of Iberian sardine (Sardine pilchardus). Since 2006, poor recruitment has led to a decrease in stock biomass, the latest in a series of such crises for sardine fisheries. Understanding the mechanisms behind recruitment fluctuations has been the objective of many previous studies, and various relationships between recruitment and environmental variables have been proposed. However, such studies face several analytical challenges, including short time-series and autocorrelated data. A new analysis of empirical relationships with environmental series is presented, using statistical methods designed to cope with these issues, including dynamic factor analysis, generalized additive models, and mixed models. Relationships are identified between recruitment and global (number of sunspots), regional (NAOAutumn), and local [winter wind strength, sea surface temperature (SST), and upwelling] environmental variables. Separating these series into trend and noise components permitted further investigation of the nature of the relationships. Whereas the other three environmental variables were related to the trend in recruitment, SST was related to residual variation around the trend, providing stronger evidence for a causal link, possible mechanisms for which are discussed. After the removal of trend and cyclic components, residual variation in recruitment is also weakly related to the previous year's spawning-stock biomass.

scholarly journals Bacterioplankton from Two Hungarian Danube River Wetlands (Beda-Karapancsa, Danube-Drava National Park) and its Relations to Environmental Variables

2016 ◽  
Vol 18 (1) ◽  
pp. 1-12
Author(s):  
Hristina Kalcheva ◽  
Mária Dinka ◽  
Edit Ágoston-Szabó ◽  
Árpád Berczik ◽  
Roumen Kalchev ◽  
...  
Keyword(s):  
Environmental Variables ◽  
National Park ◽  
Suspended Solids ◽  
Bacterial Abundance ◽  
The Other ◽  
Danube River ◽  
Oxbow Lake ◽  
Hydrological Connectivity ◽  
Chl A ◽  
Lake Type

AbstractSeasonal and spatial distribution of bacterioplankton from two Hungarian oxbow lake type wetlands, Mocskos-Danube and Riha, was studied. They were both covered by macrophytes and they had different hydrological connectivity to the Danube. The six sampling campaigns from April to October 2014 included parallel samples from the Danube River at Mohács, Hungary. Bacterial abundance was the highest in spring and in Mocskos-Danube, followed by Mohács and Riha. Positive relationships existed between bacterioplankton and temperature on one hand and suspended solids, pH, PO4-P and chl-a on the other. Negative correlations were with DOC, dissolved oxygen and NH4-N.

scholarly journals Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

2018 ◽  
Vol 54 ◽  
pp. 33
Author(s):  
Patteson Chula Mwagona ◽  
Ma Chengxue ◽  
Yu Hongxian
Keyword(s):  
Functional Groups ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Environmental Variables ◽  
Water Transparency ◽  
Functional Feeding Groups ◽  
Total Biomass ◽  
Top Down ◽  
Community Group ◽  
Filter Feeders

In this study, the concept of functional feeding groups was used to classify and model the seasonal variation of zooplankton functional groups in relation to environmental variables. A total of 48 zooplankton species were observed in the reservoir and grouped into 8 functional groups. Both environmental variable and the biomass of zooplankton functional groups vary spatially and seasonally. Water temperature, water transparency, total nitrogen and nitrates were significantly higher in summer, while chlorophyll-a and ammonium were higher in autumn and spring, respectively. Biomass of zooplankton was significantly higher in summer (245.81 μg/L), followed by autumn (196.54 μg/L) and spring (54.25 μg/L). Group RF (rotifer filter feeders) dominated in spring, accounting for 80% of the total biomass. In summer and autumn, group RC (rotifer carnivore) and SCF (small copepods and cladocerans filter feeders) were the dominant, respectively. Total nitrogen, total phosphorus, ammonium, chlorophyll-a and water transparency were the major factor influencing zooplankton community. Group RF was positively influenced by ammonium and total phosphorus, while RC, SCF and MCF (middle copepods and cladocerans filter feeders) were positively correlated with chlorophyll-a. Top-down control of phytoplankton by groups RC, SCF and MCF in Xiquanyan reservoir is not strong enough to produce negative effect. Increase in predator size biomass did not strengthen top-down control on prey. It is quite clear that the zooplankton function groups of Xiquanyan reservoir followed a predictable seasonal pattern. This therefore highlights the significance of environmental variables in structuring plankton composition in the reservoir.

scholarly journals The Impacts of Offshore Oil Exploration and Development on Macrobenthos Community：A Case Study in Chengdao Oil Field

2015 ◽  
Vol 3 (2) ◽  
pp. 13
Author(s):  
Xiaoyang Jian ◽  
Bin Zhou ◽  
Qingyun Yu ◽  
Xuexi Tang
Keyword(s):  
Heavy Metal ◽  
Species Diversity ◽  
Petroleum Hydrocarbons ◽  
Environmental Variables ◽  
Environmental Variable ◽  
Oil Field ◽  
Total Petroleum Hydrocarbons ◽  
Species Number ◽  
Mean Values ◽  
Offshore Oil

<p><span style="font-family: Times New Roman;">Univariate and multivariate methods were used to study macrobenthos collected in October 2012 from the area around a new built offshore oil platform. The univariate parameters and community structure of benthic communities were related to environmental variables. Samples were taken with a 0.1 m<sup>2</sup> Van Veen grab (33×30 ×15 cm) at each station from 15 sampling stations. The mean values of species number, abundance and species diversity (<em>H’</em>) were 25 species/grab, 104 animals/grab and 3.12/grab, respectively. A total of 142 species was recorded. Total petroleum hydrocarbons and heavy metal were strongly positively related to species number, abundance and species diversity, suggesting that petroleum hydrocarbons have harmful effects on macrobenthic communities. The BIO-ENV analyses for all stations identified COD, heavy metal and petroleum hydrocarbons as the major environmental variables influencing the infaunal patterns. However, separate analyses for two groups produced stronger correlations and different best-correlated environmental variable combinations.</span></p>

scholarly journals Diversity and Distribution of Sabellida (Annelida) under Protection Regimes

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1491
Author(s):  
Luigi Musco ◽  
Margherita Licciano ◽  
Adriana Giangrande
Keyword(s):  
Protected Area ◽  
Environmental Variables ◽  
Marine Protected Area ◽  
Distribution Patterns ◽  
Predator Prey ◽  
Ecological Requirements ◽  
Factors Influencing ◽  
Filter Feeders ◽  
Potential Factors ◽  
Habitat Formers

Sabellida are widespread, diverse and abundant in marine benthic habitats. Their distribution patterns on hard-bottom substrates are poorly studied so far. Little is known about the factors influencing their distribution, including the protection regimes that are known to affect assemblage diversity. We analyzed hard-bottom Sabellida at 1.5 and 5 m depths at the Torre Guaceto Marine Protected Area (MPA) (SE Italy) to describe diversity and distribution patterns, and to identify potential factors influencing their distribution. The Sabellida diversity varied significantly among stations and was higher at 5 m depth. No relation with the protection regime was found. Among environmental variables, only sedimentation appeared related, suggesting that local trophic features might have influenced the observed pattern. Among habitat formers, only the macroalga Halimeda tuna significantly explained part of the observed variation, probably due to its role as a basibiont for some Sabellida taxa. Other predictor variables of Sabellida distribution were the abundances of some invertebrate taxa, especially Syllidae and some filter feeders such as Sabellariida and Cirripedia, probably due to shared ecological requirements, rather than a direct effect on Sabellida distribution. The relation with the Syllidae remains obscure so far, albeit some kind of interaction (including predator/prey interactions) between these two taxa cannot be excluded. Sabellida should be taken into account when analyzing patterns of biodiversity of hard-bottom environments.

Sign in / Sign up

Export Citation Format

Share Document