Diel catch variations in a shallow-water fish assemblage at Duće Glava, eastern Adriatic (Croatian Coast)

An assemblage of shallow-water fish was sampled with a small beach seine over monthly 24-h periods between April 2000 and March 2001 at the sandy beach Duće Glava in the eastern Adriatic. Monthly sets of samples were divided into day and night catches to examine the stability of diel differences in assemblage structure over a 1-y period. A total of 61 species was caught, of which six were exclusively diurnal and 12 were nocturnal. According to abundance and biomass of individuals during day and night, the most abundant species were categorized into several groups. Ophidion rochei was exclusively nocturnal, while Nerophis ophidion and Echiichthys vipera were mostly nocturnal. Diplodus annularis and Mullus surmuletus were slightly nocturnal. Diplodus vulgaris, Pomatoschistus marmoratus and Atherina boyeri lacked a diel pattern. Sardina pilchardus, Lithognathus mormyrus, Atherina hepsetus, Sarpa salpa and Mullus surmuletus abundance peaked for a few months, probably related to timing of spawning and recruitment. At the assemblage level, the diel per cent similarity index indicates that there were major differences between the day and night assemblages in April, September, March, and August with respect to number of individuals and September, October, May and March with respect to biomass.

Download Full-text

Do the assemblages of benthic macroinvertebrates in nearshore waters of Western Australia vary among habitat types, zones and seasons?

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315405011100h ◽

2005 ◽

Vol 85 (2) ◽

pp. 217-232 ◽

Cited By ~ 17

Author(s):

M.D. Wildsmith ◽

I.C. Potter ◽

F.J. Valesini ◽

M.E. Platell

Keyword(s):

Species Composition ◽

Benthic Macroinvertebrates ◽

Habitat Type ◽

Abundant Species ◽

Subtidal Zone ◽

Habitat Types ◽

Environmental Characteristics ◽

Deposit Feeding ◽

Number Of Individuals

Benthic macroinvertebrates were sampled seasonally in the subtidal and upper and lower swash zones at two sites in each of six nearshore habitat types on the lower west coast of Australia. The habitat types, which differed mainly in the extent of their exposure to wave activity and whether sea grass and/or nearshore reefs were present, had been distinguished quantitatively using values for a suite of seven statistically-selected enduring environmental characteristics (Valesini et al., 2003). The core samples yielded 121 species representing eight phyla, among which the Polychaeta, Malacostraca and Bivalvia were the most speciose classes, contributing ∼38, 23 and 10%, respectively, to the total number of individuals. The total number of species and mean density of macroinvertebrates at the most protected habitat type (1), i.e. 70 and 209·2 individuals 0·1 m−2, respectively, were far greater than in any other habitat type. Habitat type influenced species composition to a greater extent than either zone or season. Furthermore, the extents of the differences among the species compositions of the six habitat types statistically matched the extents of the differences among the values for the suite of enduring environmental characteristics that distinguished each of those habitat types. Overall, the species composition at habitat type 1 was the most distinct, containing five abundant species of polychaetes that were adapted to deposit-feeding in calm waters with high levels of organic material and which were rare in all other habitat types. In contrast, the fauna at the most exposed habitat type was characterized by four crustacean species and a species of bivalve and polychaete, whose mobility and tough external surface facilitated their survival and feeding in turbulent waters. The zonal differences in faunal compositions among habitat types were greatest in the case of the subtidal zone. The faunal compositions differed among zones and seasons only at the most protected habitat type.

Download Full-text

Tidal fish connectivity of reef and sea grass habitats in the Indo-Pacific

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s002531540705638x ◽

2007 ◽

Vol 87 (5) ◽

pp. 1287-1296 ◽

Cited By ~ 41

Author(s):

Richard K.F. Unsworth ◽

James J. Bell ◽

David J. Smith

Keyword(s):

Shallow Water ◽

National Park ◽

Fish Assemblages ◽

Fish Fauna ◽

Subsistence Fisheries ◽

Tidal State ◽

Sea Grass ◽

Water Fish ◽

Tidal Changes ◽

Near Shore

The present study considered the influence of the tide on shallow water fish assemblages within the Wakatobi Marine National Park, Indonesia. Timed underwater visual observations were made across a gradient of intertidal to subtidal habitats from near-shore to reef crest at different tidal heights. Transient fish were found to dominate shallow water fish assemblages and the assemblage composition varied with tidal state. Fish assemblages were more diverse and abundant at higher tides in both coral and sea grass habitats, however, this was more pronounced within sea grass habitats. A tidal reduction from ≈2.0m to ≈0.8m (above chart datum) corresponded to a 30% reduction in fish abundance, while species richness also significantly decreased from 13.5 to 10.8 species per standardized timed observation. Fifty fish groups were reported from sea grass habitats with the most abundant being from the Engraulidae family and Lethrinus harak, which form important local subsistence fisheries. This research confirms the importance of tidal changes in structuring the fish fauna of Indonesian sea grass habitats and underlines the connectivity that exists between these habitats and nearby coral reefs.

Download Full-text

Structure analysis of shallow water ecosystems: Interaction of microbiological, chemical and physical characteristics measured in the overlying waters of sandy beach sediments

Estuarine Coastal and Shelf Science ◽

10.1016/s0302-3524(81)80059-x ◽

1981 ◽

Vol 13 (5) ◽

pp. 579-589 ◽

Cited By ~ 14

Author(s):

Manfred Bölter ◽

Lutz-Arend Meyer-Reil ◽

Dawson Rodger ◽

Liebezeit Gerd ◽

Wolter Karin ◽

...

Keyword(s):

Shallow Water ◽

Structure Analysis ◽

Sandy Beach ◽

Physical Characteristics ◽

Beach Sediments ◽

Water Ecosystems

Download Full-text

Schéma SRNHS Analyse et Application d'un schéma aux volumes finis dédié aux systèmes non homogènes

Revue Africaine de la Recherche en Informatique et Mathématiques Appliquées ◽

10.46298/arima.1870 ◽

2006 ◽

Vol Volume 5, Special Issue TAM... ◽

Author(s):

Slah SAHMIM ◽

Fayssal Benkhaldoun

Keyword(s):

Shallow Water ◽

Scalar Case ◽

Finite Volume Scheme ◽

Two Phase ◽

Homogeneous Systems ◽

Selfsimilar Solution ◽

International Audience ◽

The Stability ◽

New Formulation ◽

Water Problems

International audience This article is devoted to the analysis, and improvement of a finite volume scheme proposed recently for a class of non homogeneous systems. We consider those for which the corressponding Riemann problem admits a selfsimilar solution. Some important examples of such problems are Shallow Water problems with irregular topography and two phase flows. The stability analysis of the considered scheme, in the homogeneous scalar case, leads to a new formulation which has a naturel extension to non homogeneous systems. Comparative numerical experiments for Shallow Water equations with sourec term, and a two phase problem (Ransom faucet) are presented to validate the scheme. Cet article concerne l'analyse et l'application, d'un schéma proposé récemment por une classe de systèmes non homogènes. Nous considérons ceux pour lesquels le problème de Riemann correpondant admet une solution autosimilaire. Deux exemples importants de tels problèmes sont l'écoulement d'eau peu profonde au-dessus d'un fond non plat et les problèmes diphasiques. l'analyse de stabilité du schéma, dans le cas scalaire homogène, amène à une nouvelle écriture qui a une extension naturelle pour le cas non homogène. Des expériences numériques comparatives pour des équations de saint-Venant avec topographie variable, et un problème diphasique (Robinet de Ransom) sont présentés pour évaluer l'efficacité du schéma.

Download Full-text

Olive Oil Based Organogels for Effective Topical Delivery of Fluconazole: In-vitro Antifungal Study

Journal of Pharmaceutical Research International ◽

10.9734/jpri/2020/v32i2530821 ◽

2020 ◽

pp. 29-36

Author(s):

Mohammad Muqtader Ahmed ◽

Farhat Fatima ◽

Abdul Bari Mohammed

Keyword(s):

Olive Oil ◽

Ex Vivo ◽

Similarity Index ◽

Ex Vivo Permeation ◽

Efficient Delivery ◽

In Vitro Diffusion ◽

Permeation Studies ◽

The Stability ◽

Hot Melt

The objective of the study was to formulate olive oil based organogels for the topical application of fluconazole (FLZ), to ensure the efficient delivery of the drug deeper in to the skin layers. Methods: Nine formulations developed by hot-melt method using olive oil, sorbitan monostearate (SMS) and FLZ. Prepared formulations characterized for macro evaluations, pH, spreadibility, viscosity, gel-sol transition, in-vitro diffusion study. Further optimized formulation evaluated for ex-vivo percutaneous permeation, in-vitro antifungal studies and stability studies by similarity index. Results: The results of evaluated parameters ensure the stability and effectiveness of the prepared olive oil based organogels. In-vitro diffusion studied reflects decrease in drug release with increase in surfactant concentration due to increase in viscosity. Moreover, ex-vivo permeation studies revealed that the permeation of FLZ was enhanced for optimized formulations (F6) as compared to the marketed gel formulation. Further, the optimized formulation exhibits the broad zone of inhibition against fungal strains in comparison to control and marketed product during in-vitro antifungal study. Conclusion: The olive oil based organogels formulation shown the enhanced permeation of FLZ from organogel network structure with good antifungal activity as compared to the marketed formulation. Henceforth, the FLZ organogel formulations could be used topically for the effective treatment of fungal infection.

Download Full-text

The The diversity and abundance of Hymenoptera insects on tidal swamp rice field in Indragiri Hilir District, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210323 ◽

2020 ◽

Vol 21 (3) ◽

Author(s):

ZAHLUL IKHSAN ◽

HIDRAYANI ◽

YAHERWANDI ◽

HASMIANDY HAMID

Keyword(s):

Species Diversity ◽

Rice Field ◽

Diversity Index ◽

Human Life ◽

Similarity Index ◽

Pitfall Trap ◽

Vital Role ◽

Tidal Swamp ◽

Abundance And Diversity ◽

Number Of Individuals

Abstract. Ikhsan Z, Hidrayani, Yaherwandi, Hamid H. 2020. The diversity and abundance of Hymenoptera insects on tidal swamp rice field in Indragiri Hilir District, Indonesia. Biodiversitas 21: 1020-1026. Hymenoptera is one of the four largest insect orders and it plays a vital role in human life as pollinators, parasitoids, and predators. Hymenoptera parasitoids are particularly important as agents of biological control of pest. The objective of this research was to study the diversity and abundance of Hymenoptera on tidal swamp rice field in Indragiri Hilir District, Riau Province, Indonesia. Samplings were conducted in 3 sub-districts of rice production centers, namely Batang Tuaka, Keritang and Reteh, using four trapping techniques (i.e. insect net, malaise trap, pitfall trap, and yellow pan trap). Shannon diversity index (H '), Krebs evenness index (E), and Jaccard similarity index (Is) were calculated. We found 4,701 individuals consisting of 39 families and 319 species of Hymenoptera at the three studied areas. Tidal swamp rice in Indragiri Hilir District had a high species diversity of Hymenoptera parasitoids and Hymenoptera predators, but a moderate species diversity of Hymenoptera pollinators. Species diversity and evenness of Hymenoptera parasitoids and predators were higher in Keritang than in Batang Tuaka and Reteh. The families of Formicidae, Braconidae, Ichneumonidae, and Scelionidae had the highest number of species, while Formicidae, Scelionidae, Diapriidae, and Braconidae had the highest number of individuals. Based on these findings, the abundance and diversity of Hymenoptera insects in Indragiri Hilir District have the potentials to be developed as biological agents to control pests on tidal swamp rice in this area.

Download Full-text

Richness and abundance of anurans (amphibia) in pasture and secondary forest areas near to Porto Velho (Rondonia, Brazil)

Revista Colombiana de Ciencia Animal - RECIA ◽

10.24188/recia.v8.n1.2016.197 ◽

2016 ◽

Vol 8 (1) ◽

pp. 7

Author(s):

MILENE DA ROCHA M. ◽

CRISTIANO RIBEIRO F. ◽

RANIERE GARCEZ C.S.

Keyword(s):

Secondary Forest ◽

Abundant Species ◽

Secondary Forests ◽

Lack Of Information ◽

Environmental Integrity ◽

Pasture Area ◽

Tools And Techniques ◽

Number Of Individuals ◽

The City ◽

Porto Velho

The Amazon has a great biodiversity, however in this regions some locations still without no research, showing the need for studies in this localities. The lack of information about the diversity of frogs and the speed of change in the landscape that have been taking place on the planet, demonstrates the urgent need to preserve the remaining resources. In this adverse scenario, live frogs that are sensitive to changes in natural forest areas, and are recognized as Bioindicator of environmental integrity. The present study had scoped to do a survey of the anuran species in a country area, near to the city of Porto Velho (RO). This land, is formed by two separate areas, one classified as secondary forests and the other as pasture area. The sampling was carried out from January to may 2012, using tools and techniques for catch in the night delimited by time, pitfall traps and frogs occasional meetings Were captured 63 specimens of Anurans, distributed in six families, where the richest in species were the Leptodactylidae (n = 6), Hylidae (n = 5), Bufonidae (n = 4), Microhylidae (n = 2), Brachycephalidae (n = 2) and Aromobatidae (n = 2), totaling 21 species identified.The most abundant species were the Leptodactylus chaquensis (n = 12) and Leptodactylus andreae (n = 8). The pasture area exhibited the greatest number of individuals captured with 65.07% of all frogs collected.

Download Full-text

Observations of cetaceans off southern Sri Lanka, April 2007–2013

J. Cetacean Res. Manage. ◽

10.47536/jcrm.v20i1.236 ◽

2019 ◽

Vol 20 (1) ◽

pp. 13-25

Author(s):

R. C. Anderson ◽

A. Alagiyawadu

Keyword(s):

Sri Lanka ◽

Bottlenose Dolphin ◽

Sperm Whale ◽

Abundant Species ◽

Sperm Whales ◽

Spotted Dolphin ◽

Common Bottlenose Dolphin ◽

Westward Movement ◽

Number Of Individuals ◽

Blue Whales

Cetaceans were observed off the South coast of Sri Lanka in the month of April, every year over a seven-year period, 2007–13. During 48 days atsea a total of 290 cetacean sightings were recorded. Blue whales were abundant, accounting for 61% (n = 177) of all sightings. This concentrationof blue whales was predicted and discovered based on a migration hypothesis and there was evidence of the expected net westward movement inApril. Nevertheless, most blue whales seen were not obviously on passage and many appeared to be feeding. Mothers with calves and likelyreproductive behaviour (breaching and rushing) were also observed. There were five sightings of Bryde’s-type whales (B. brydei/edeni); four wereidentified as B. brydei, one was identified as B. edeni. Sperm whales were sighted 16 times within a narrow band centred just outside the 1,000misobath. Modal group size was 10–12; based on size most individuals appeared to be mature females or immatures. Spinner dolphin (n = 35 sightings)was the most abundant species, accounting for 67% of all cetaceans seen by number of individuals. They were frequently associated with tuna andseabirds. Risso’s dolphin was only seen once, despite being reported as common around Sri Lanka in the early 1980s. They were taken in largenumbers by local fisheries, which may have reduced local abundance. Other species recorded were: dwarf sperm whale (n = 3 sightings); shortfinnedpilot whale (n = 3); common bottlenose dolphin (n = 9); Indo-Pacific bottlenose dolphin (n = 3); pantropical spotted dolphin (n = 4); andstriped dolphin (n = 4). Since the discovery of blue whales off southern Sri Lanka, commercial whale watching centred on the fishing port of Mirissahas developed rapidly, bringing new revenue to the region but also the potential for disturbance to the whales.

Download Full-text

Tanaidacea (Crustacea: Peracarida) from Japan. IV. Shallow-water species from Akajima with notes on the recolonization potential of tanaids

Zootaxa ◽

10.11646/zootaxa.1678.1.1 ◽

2008 ◽

Vol 1678 (1) ◽

pp. 1 ◽

Cited By ~ 7

Author(s):

KIM LARSEN ◽

MICHITAKA SHIMOMURA

Keyword(s):

Phylogenetic Analysis ◽

Shallow Water ◽

New Genus ◽

Abundant Species ◽

Two New Species ◽

Sandy Habitat ◽

Nansei Islands ◽

Shallow Water Species ◽

Water Species ◽

Preliminary Phylogenetic Analysis

Two new species of tanaids were collected from colonization traps deployed in a shallow water, sandy habitat off Akajima, Nansei Islands. One new parapseudidaen, Parapseudes arenamans, and one new nototanaidaen genus and species, Paranesotanais longicephalus, are described herein. A preliminary phylogenetic analysis of the closest genera confirms the validity of the new genus and suggests a close affinity between the Leptocheliidae and Nototanaidae. Paranesotanais longicephalus was by far the most abundant species in the habitat. Parapseudes arenamans is faster in colonization of vacant substrate (opportunistic species), while being an inferior competitor to Paranesotanais longicephalus later in succession. A key to Nesotanais and Paranesotanais is provided.

Download Full-text