Fishes from Lachuá Lake, Upper Usumacinta Basin, Guatemala

Guatemala’s Maya Lowlands constitute one of the most biodiverse regions in Mesoamerica and include 35% of the total number of continental fish species estimated for the nation. From May 2000 through February 2001, we conducted the first long-term ichthyological survey of Lachuá Lake, a 4 km2, 195 m deep, karstic sinkhole located in the middle of Guatemala’s Laguna Lachuá National Park (LLNP), southern Maya Lowlands. Thirty-six native fish species were identified and Gobiomorus dormitor Lacepède, 1800 was collected for the first time in northern Guatemala. Greater number of species occurred in the rocky shore of the lake’s littoral zone, especially around the mouths of Lachuá’s tributary and effluent rivers, and close to the visitor center of LLNP. A hierarchical cluster analysis for classifying ichthyogeographically regional fish assemblages placed Lachuá Lake in the upper Usumacinta River drainage basin shared by Guatemala and Mexico, stressing the need for regional conservation and management strategies.

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Stroke Prevention in Atrial Fibrillation: Where are We Now?

Clinical Medicine Insights Cardiology ◽

10.4137/cmc.s8976 ◽

2012 ◽

Vol 6 ◽

pp. CMC.S8976 ◽

Cited By ~ 6

Author(s):

Yousif Ahmad ◽

Gregory Y.H. Lip

Keyword(s):

Atrial Fibrillation ◽

Stroke Prevention ◽

Management Strategies ◽

Bleeding Risk ◽

Long Term Study ◽

Risk Patients ◽

First Time ◽

Major Progress ◽

Made In

Atrial fibrillation is the commonest arrhythmia worldwide and is a growing problem. AF is responsible for 25% of all strokes, and these patients suffer greater mortality and disability. Warfarin has traditionally been the only successful therapy for stroke prevention, but its limitations have resulted in underutilisation. Major progress has been made in AF research, leading to improved management strategies. Better risk stratification permits identification of truly low-risk patients who do not require anticoagulation and we are able to simplify ourevaluation of a patient's bleeding risk. The advent of novel anticoagulants means warfarin is no longer the only choice for stroke prophylaxis. These drugs circumvent many of warfarin's inconveniences, but only long-term study and use will conclusively demonstrate how they compare to warfarin. The landscape of stroke prevention in AF has changed with effective alternatives to warfarin available for the first time in 60 years—but each new option brings new considerations.

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First report of a swordfish (Xiphias gladius Linnaeus, 1758) beneath open-sea farming cages in the Western Mediterranean Sea.

Mediterranean Marine Science ◽

10.12681/mms.503 ◽

2013 ◽

Vol 15 (1) ◽

pp. 72 ◽

Cited By ~ 9

Author(s):

P. ARECHAVALA-LOPEZ ◽

D. IZQUIERDO-GOMEZ ◽

P. SANCHEZ-JEREZ

Keyword(s):

Fish Assemblages ◽

Management Strategies ◽

Western Mediterranean ◽

Adult Individual ◽

Western Mediterranean Sea ◽

Ecological Changes ◽

Open Sea ◽

Fish Predators ◽

Xiphias Gladius ◽

First Time

An adult individual of swordfish (Xiphias gladius L.) was reported for the first time aggregated at coastal Mediterranean fish-farm facilities. This record highlights the necessity to assess the potential ecological changes on wild fish assemblages by coastal farming activity, especially on this type of endangered large migratory fish predators, which might be taken into account for further management strategies.

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Long-Term Trends in the Structure and Dynamics of the Fish Communities in Buško Blato Reservoir

Croatian Journal of Fisheries ◽

10.2478/cjf-2020-0007 ◽

2020 ◽

Vol 78 (2) ◽

pp. 69-78

Author(s):

Aldijana Mušović ◽

Rifat Škrijelj ◽

Mahir Gajević ◽

Belma Kalamujić Stroil ◽

Adi Vesnić ◽

...

Keyword(s):

Fish Species ◽

Ecological Factors ◽

Lepomis Gibbosus ◽

Tinca Tinca ◽

Structure And Dynamics ◽

Current State ◽

Long Term Trends ◽

Endemic Fish ◽

First Time

AbstractBuško Blato Reservoir, the third largest hydro accumulation in Europe, is situated in the south-eastern part of the karstic Livanjsko Polje Valley. This aquatic ecosystem is distinguished by a very rich ichthyofauna and the presence of four endemic fish species. Numerous studies focus on ichthyological researches of Buško Blato Reservoir. Its ichthyofauna has been exposed to changes in ecological factors, which in turn reflected on the structure and composition of fish populations. The main objective of this paper was to assess the current state and predict future trends in the ichthyofauna structure and dynamics based on the field data and comprehensive analyses of literature data. The results of the research indicated the presence of 11 fish species from four families, which is the largest number of fish species ever recorded in this ecosystem. Sander lucioperca, Lepomis gibbosus, Pseudorasbora parva and Tinca tinca were recorded for the first time in this ecosystem, while some previously recorded species were not found. The results of the analyses clearly indicate the presence of natural interspecific competition and significant level of threats to the endemic fish species caused by human activities.

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Long-term study of reservoir cascade in south-eastern Brazil reveals spatio-temporal gradient in fish assemblages

Marine and Freshwater Research ◽

10.1071/mf18109 ◽

2018 ◽

Vol 69 (12) ◽

pp. 1983 ◽

Cited By ~ 8

Author(s):

Raquel Coelho Loures ◽

Paulo Santos Pompeu

Keyword(s):

River Basin ◽

Fish Species ◽

Fish Assemblage ◽

Native Species ◽

Fish Assemblages ◽

Native Fish ◽

Fish Diversity ◽

Fish Assemblage Structure ◽

Long Term Study

In reservoir cascades, effects on fish assemblages are expected to strengthen over time and transfer from one reservoir to an adjacent one. To test this, fish-assemblage data from 23 years of monitoring in the Araguari reservoir cascade system, upper Paraná River basin, were analysed. The results showed a clear reduction in richness of native and migratory fish species and an increase of non-native species, following reservoir formation. Migratory species richness was higher in reservoirs that presented habitats similar to lotic stretches or tributaries upstream of the impounded area. There was a clear tendency for native species to decline and non-native fish species to increase, in a downstream direction. Fish assemblages became increasingly dissimilar as reservoirs became more distant from each other (longitudinal gradient) and were dominated by small and medium-sized species. Alongside longitudinal position, reservoir area, age and the presence of herbivorous non-native fish were found to be important predictors of variation in fish-assemblage structure. Results from the present study help clarify the potential accumulated impacts of reservoir cascades on fish diversity, which must be carefully considered in river-basin inventories for hydropower plants, and reinforce the importance of long-term monitoring, considering longitudinal and lateral dimensions of the basin.

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Historical Changes in Large River Fish Assemblages of the Americas

Historical Changes in Large River Fish Assemblages of the Americas ◽

10.47886/9781888569728.ch18 ◽

2005 ◽

Keyword(s):

Species Richness ◽

Fish Species ◽

Fish Assemblages ◽

Drainage Basin ◽

Middle Part ◽

The State ◽

Biotic Integrity ◽

Wisconsin River ◽

Upper Mississippi River Basin ◽

River Fish

Abstract.—The Wisconsin River is a lowland warmwater river located entirely within the state of Wisconsin. It is the largest river within the state, with a length of 676 km, a drainage basin of 31,800 km2, and an estimated mean annual flow at the mouth of 292 m3/s. The middle part of the river has been heavily modified by dams and pollution, but the lower portion is relatively nondegraded. A total of 110 native fish species have been recorded from the river, a high number for the upper Mississippi River basin. Only two alien species occur and only one, common carp Cyprinus carpio, is common. Five stateendangered, five state-threatened, and 10 state-special-concern (=vulnerable) fishes are known from the river. Populations of the endangered black redhorse Moxostoma duquesnei, threatened paddlefish Polyodon spathula, blue sucker Cycleptus elongatus, black buffalo Ictiobus niger, and vulnerable western sand darter Ammocrypta clara in the Wisconsin River are among the largest in the state for these species. Historical data are scarce, but it appears that no fish species have been eliminated from the river. However, several species have been extirpated from discrete reaches of the river. Fish species richness decreases from mouth to headwaters, but reach-specific fish assemblage structure and composition and biotic integrity vary in a more complex pattern, most likely as a consequence of habitat fragmentation and isolation by dams and industrial and municipal pollution. In particular, the Prairie du Sac Dam, lowermost on the river, prevents upstream fish movement and causes a sharp drop in species richness and biotic integrity upstream.

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Diversidad y distribución de peces y su relación con variables ambientales, en el sur del Golfo de México

Revista de Biología Tropical ◽

10.15517/rbt.v66i1.26255 ◽

2017 ◽

Vol 66 (1) ◽

pp. 438

Author(s):

Daniel Torrruco ◽

Alicia González ◽

Ángel Torruco González

Keyword(s):

Spatial Distribution ◽

Fish Species ◽

Fish Assemblages ◽

Management Strategies ◽

Mesh Size ◽

Demersal Fish ◽

Average Weight ◽

Important Species ◽

Spatial Management ◽

River Mouths

The Campeche Sound has a high heterogeneity of habitats, great fish species diversity, and a strong presence of oil and fishing industries. Even though some information of bento-demersal fish of the area is available, this has been focused on some economically important species. This way, our objective of this study was to obtain the ichthyofaunal spatial distribution and its relationship with this study were were to obtain updated information on a complete local fish species spatial distribution and their relationship with environmental elements, this will improve the baseline to evaluate the potential impact of future oil and fishing developments. For this, our approach used a database obtained in 2010, with a capture made in 54 sites with standard shrimp fishing trawls (60 feet long x 1¼ in. mesh size; towing time 30 min, 2 knots; 19 to 600 m depth) in the Campeche Sound. Our data analysis included: dominance, diversity, equity, assemblies, spatial management and a landscape representation of the area. We collected a total of 33 315 fish, of 80 families, 138 genera and 193 species, that corresponded to 2 502 438 kg. The fish classes Chondrichthyes and Actinopterygii predominated. A total of 17 were dominant, associated to sandy and muddy bottoms, although were species of estuarine environments, reef and pelagic habitats. Averaged diversity (H') was of 3.2 bits/individuals. In decreasing diversity order, the common fish belong to Perciformes (84 species), Pleuronectiformes (23), Scorpaeniformes (15) and Tetraodontiformes (14); in the same way, the higher richness families were Sciaenidae (15 species), Paralichthyidae (12), Carangidae (10), and Triglidae and Synodontidae (7). Most common genuses were Prionotus (6 species), Citharichthys and Sphoeroides (4 each). Per each station, richness varied between 3 and 56 species, with an average weight of 46 kg. Fish assemblage composition was different among habitats and areas, with divergent management strategies. Landscape analysis defines nodules of high density and diversity that corresponded to river mouths, lagoons and reef areas fish assemblages. Of the relation between variables and community descriptors, only the organic carbon was significant for both abundance and biomass, the REDOX for the species richness and the other variables were not important.

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Forschung zur richtigen Zeit, umsetzungsorientiert und politisch eingebettet

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2015.0348 ◽

2015 ◽

Vol 166 (6) ◽

pp. 348-351

Author(s):

Rolf Manser ◽

Konrad Steffen ◽

Ueli Meier ◽

Christian Küchli

Keyword(s):

Climate Change ◽

Research Program ◽

Management Strategies ◽

Forest Policy ◽

Adaptation To Climate Change ◽

Climate Change Research ◽

Federal Institute ◽

The Right ◽

First Time

Research at the right time, implementation-oriented and politically embedded Climate change is occurring at a speed that raises doubts as to whether multi-functional forests can adapt to it naturally in time. In the medium to long term, important forest services seem to be endangered. Therefore, forest management strategies that support the adaptation of forests and maintain forest functions are necessary. In order to develop the necessary knowledge base and qualified decision-making support, the Swiss Federal Office for the Environment and the Swiss Federal Institute for Forest, Snow and Landscape Research started the “Forest and Climate Change” research program in 2009. This special issue, devoted to the reaction and sensitivity of forest trees and stands to increased drought, presents for the first time results of the research program more broadly. This research program is one of the activities at the federal level relating to mitigation of climate change and adaptation to its impacts. It is politically embedded as an integral part of both the Forest Policy 2020 and the Federal Council's strategy of adaptation to climate change.

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Hydrographic variability in Icelandic waters during recent decades and related changes in distribution of some fish species

ICES Journal of Marine Science ◽

10.1093/icesjms/fss027 ◽

2012 ◽

Vol 69 (5) ◽

pp. 816-825 ◽

Cited By ~ 39

Author(s):

Héðinn Valdimarsson ◽

Olafur S. Astthorsson ◽

Jonbjorn Palsson

Keyword(s):

Fish Species ◽

Saline Water ◽

Shelf Area ◽

Seasonal Time Series ◽

Shelf Seas ◽

Commercial Species ◽

Area North ◽

First Time ◽

Icelandic Waters

Abstract Valdimarsson, H., Astthorsson, O. S., and Palsson, J. 2012. Hydrographic variability in Icelandic waters during recent decades and related changes in distribution of some fish species. – ICES Journal of Marine Science, 69: 816–825. Seasonal time-series of temperature and salinity around Iceland have been collected, with repeat observations at stations, since the start of the 1970s. After fairly cold years during the early 1990s, a reversal occurred during the mid-1990s and the period from 1996 to 2010 was one with warmer, more saline water in shelf seas around Iceland. Temperatures and salinities have been frequently above the long-term mean in the waters to the south and west of the country, and these conditions have also influenced the shelf area north of the country. Marked changes have also been observed in the distribution of many fish species during this warm period. Southern commercial species have extended farther north (e.g. haddock, monkfish, mackerel), a northern species is retreating (capelin), rare species and vagrants have been observed more frequently (e.g. greater fork beard, blue antimora, snake pipefish, sea lamprey, Ray's bream), and 31 species, from both shelf and oceanic waters, have been recorded for the first time since 1996. The most obvious explanation for these changes in the ecosystem has to be the warming of 1–2°C in the waters south and west of Iceland during the past 15 years.

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Characterization and evolution of spearfishing in Madeira archipelago, Eastern Atlantic

Aquatic Living Resources ◽

10.1051/alr/2020015 ◽

2020 ◽

Vol 33 ◽

pp. 15

Author(s):

Roi Martínez-Escauriaza ◽

Claudio Vieira ◽

Lídia Gouveia ◽

Nuno Gouveia ◽

Margarida Hermida

Keyword(s):

Fish Species ◽

Young Men ◽

Coastal Areas ◽

Teleost Fishes ◽

The North ◽

Southeast Coast ◽

Madeira Archipelago ◽

First Time

Data obtained from licenses of spearfishers and surveys conducted in 2004 and 2017 allowed for the analysis, for the first time, of the practice of spearfishing in the Madeira archipelago. Only a small percentage of the population practices spearfishing, mostly local young men. Most of them practice the activity with a partner throughout most of the year and along most of the island's coastal areas, although preferentially along the North and Southeast coast. Results show how, in recent years, despite the population of spearfishers decreasing, the abundance in the annual catch potentially increased, probably due to the higher investment of time in this activity. It has been observed that many fishers complement their catches with manual collecting of invertebrates. Overall, 40 teleost fishes and also 4 crustaceans and 8 molluscs were identified. The most frequently captured fish species were parrotfish and white seabream, while limpets were the most collected invertebrates in both selected periods.

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Somatic Embryogenesis and In vitro Plant Regeneration in Vigna trilobata (L.) Verd. - A Potential Pasture Legume

Plant Tissue Culture and Biotechnology ◽

10.3329/ptcb.v19i1.4990 ◽

1970 ◽

Vol 19 (1) ◽

pp. 89-99

Author(s):

K. Choudhary ◽

M. Singh ◽

M. S. Rathore ◽

N. S. Shekhawat

Keyword(s):

Somatic Embryogenesis ◽

Growth Regulators ◽

Somatic Embryos ◽

Basal Medium ◽

Long Term Study ◽

Continuous Application ◽

First Time ◽

Pasture Legume

This long term study demonstrates for the first time that it is possible to propagate embryogenic Vigna trilobata and to subsequently initiate the differentiation of embryos into complete plantlets. Initiation of callus was possible on 2,4-D. Somatic embryos differentiated on modified MS basal nutrient medium with 1.0 mg/l of 2,4-D and 0.5 mg/l of Kn. Sustained cell division resulted in globular and heart shape stages of somatic embryos. Transfer of embryos on to a fresh modified MS basal medium with 0.5 mg/l of Kn and 0.5 mg/l of GA3 helped them to attain maturation and germination. However, the propagation of cells, as well as the differentiation of embryos, were inhibited by a continuous application of these growth regulators. For this reason, a long period on medium lacking these growth regulators was necessary before the differentiation of embryos occurred again. The consequences for improving the propagation of embryogenic cultures in Vigna species are discussed. Key words: Pasture legume, Vigna trilobata, Globular, Heart shape, somatic embryogenesis D.O.I. 10.3329/ptcb.v19i1.4990 Plant Tissue Cult. & Biotech. 19(1): 89-99, 2009 (June)

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