The influence of experimental scale on estimating the predation rate of Gammarus lacustris (Crustacea: Amphipoda) on Daphnia in an alpine lake

We estimated the net P transport by Gammarus lacustris from the benthic to pelagic regions of a fishless alpine lake and compared it with P regeneration by the entire plankton community. Gammarus lacustris released between 5.2 and 18.1 ng P·L-1·h-1 (adults only and adults plus immatures, respectively) in the pelagic region during nighttime vertical migration. Additional P released into and removed from the water column due to predation on zooplankton was estimated at 1.87 and 2.3 ng P·L-1·h-1, respectively. The net daily regeneration of 52.2-181.4 ng P·L-1·day-1 by the G. lacustris population represented 9.5-32.9% of the total P regenerated by the planktonic community. The majority of the P released by G. lacustris represents "new" P to the pelagic zone because it originated in sediments. We conclude that G. lacustris can represent an important link in benthic-pelagic coupling in oligotrophic mountain lakes.

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Contribution of Gammarus lacustris to phosphorus recycling in a fishless alpine lake

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-56-9-1679 ◽

1999 ◽

Vol 56 (9) ◽

pp. 1679-1686 ◽

Cited By ~ 9

Author(s):

Frank M. Wilhelm ◽

Jeff J. Hudson ◽

David W. Schindler

Keyword(s):

Alpine Lake ◽

Gammarus Lacustris ◽

Phosphorus Recycling

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Effects of Gammarus lacustris (Crustacea: Amphipoda) on plankton community structure in an alpine lake

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f99-067 ◽

1999 ◽

Vol 56 (8) ◽

pp. 1401-1408 ◽

Cited By ~ 22

Author(s):

Frank M Wilhelm ◽

David W Schindler

Keyword(s):

Community Structure ◽

Alpine Lakes ◽

Plankton Community ◽

Alpine Lake ◽

Canadian Rockies ◽

Gammarus Lacustris ◽

Enclosure Experiments ◽

Daphnia Middendorffiana ◽

Plankton Community Structure

The amphipod Gammarus lacustris is generally considered as a herbivore or a detritivorous scavenger, but we and others have observed it preying on pelagic zooplankton in fishless alpine lakes of the Canadian Rockies. We tested the hypothesis that G. lacustris predation alters the plankton community structure of alpine lakes by manipulating G. lacustris density in large (2800 L) in situ enclosure experiments. Compared with control enclosures (no Gammarus), Daphnia middendorffiana abundance was reduced 49, 85, and 100% in the low, medium, and high (40, 200, and 400 individuals·m-2) Gammarus density enclosures, respectively. Hesperodiaptomus arcticus density was not significantly related to G. lacustris density. Comparison of mesocosm results with lake data showed that G. lacustris predation on D. middendorffiana in the lake was lower, possibly because a pelagic deepwater refugium allows Daphnia to escape predation. The results show that G. lacustris predation can affect the plankton community structure in small fishless alpine lakes.

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Demography and predation rate ofChrysoperla carnea(Neuroptera: Chrysopidae) fed onHyalopterus pruni(Hemiptera: Aphididae)

10.1603/ice.2016.91747 ◽

2016 ◽

Author(s):

Remzi Atlihan

Keyword(s):

Predation Rate

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Climate change as the dominant driver of recent ecological changes in a semi-arid alpine lake from the Chinese Loess Plateau

Journal of Paleolimnology ◽

10.1007/s10933-020-00167-5 ◽

2021 ◽

Author(s):

Xinwei Yan ◽

Jianbao Liu ◽

Kathleen M. Rühland ◽

John P. Smol ◽

Fahu Chen

Keyword(s):

Climate Change ◽

Loess Plateau ◽

Alpine Lake ◽

Chinese Loess Plateau ◽

Chinese Loess ◽

Ecological Changes ◽

Semi Arid ◽

The Chinese Loess Plateau

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Diversity of Algae and Cyanobacteria and Bioindication Characteristics of the Alpine Lake Nesamovyte (Eastern Carpathians, Ukraine) from 100 Years Ago to the Present

Diversity ◽

10.3390/d13060256 ◽

2021 ◽

Vol 13 (6) ◽

pp. 256

Author(s):

Petro M. Tsarenko ◽

Olena P. Bilous ◽

Olha M. Kryvosheia-Zakharova ◽

Halyna H. Lilitska ◽

Sophia Barinova

Keyword(s):

Species Composition ◽

Structural Changes ◽

Algal Species ◽

Taxonomic Composition ◽

Alpine Lake ◽

Algal Flora ◽

Ecological Analysis ◽

Modern Species ◽

Eastern Carpathians ◽

Infraspecific Taxa

The species diversity and changes in the structural dynamics of the algal flora from the alpine lake Nesamovyte has been studied for 100 years. During the period of investigations, 234 species (245 infraspecific taxa) were revealed to cover more than 70% of the modern species composition of the studied lake. The modern biodiversity of algae is characterized by an increase in the number of widespread forms, a change from the baseline “montane” complex in comparison to the beginning of the 20th century. Nevertheless, the Nesamovyte Lake still has a unique algae composition that is typical for high-mountainous European lakes. The presence of a different complex of conventionally arctic species of algae, in particular, diatoms is discussed. Structural changes in the taxonomic composition of the algal flora of the lake as well as in the complex of the leading genera, species and their diversity are revealed. An ecological analysis of the algal species composition of the lake showed vulnerability and degradation to the ecosystem of the lake. On this basis, the issue regarding the question of protection and preservation of the algae significance and uniqueness of the flora of algae in the Nesamovyte Lake are discussed.

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Use of grass carp (Ctenopharyngodon idella) as a biological control agent for submerged aquatic macrophytes

Planta Daninha ◽

10.1590/s0100-83582014000400011 ◽

2014 ◽

Vol 32 (4) ◽

pp. 765-773

Author(s):

A.F. Silva ◽

C. Cruz ◽

R.L.C.M. Pitelli ◽

R.A. Pitelli

Keyword(s):

Grass Carp ◽

Aquatic Macrophytes ◽

Biological Control Agent ◽

Body Weight Gain ◽

Predation Rate ◽

Control Agent ◽

Ctenopharyngodon Idella ◽

Ceratophyllum Demersum ◽

Grass Carp Ctenopharyngodon Idella ◽

Submerged Aquatic Macrophytes

This study aimed to evaluate feed preference and control efficacy of grass carp (Ctenopharyngodon idella) on the aquatic macrophytes Ceratophyllum demersum, Egeria densa and Egeria najas. An experiment was carried out at mesocosms conditions with 2,000 liters capacity and water residence time of 2.8 days. C. demersum, E. densa e E. najas biomasses were offered individually with sixty g and coupled in similar quantities of 30 g of each species, evaluated during 81 days, envolving 6 treatments. (1 - C. demersum, 2 - E. najas, 3 -E. densa, 4 - C. demersum + E. najas, 5 - C. demersum + E. densa and 6 - E. najas + E. densa). When offered individually, E. najas and C. demersum presented the same predation rate by grass carp, which was higher than E. densa predation rate. When plants were tested in pairs, the order of feed preference was C. demersum > E. najas > E. densa. E. najas and C. demersum percentage control ranged from 73 to 83%. No relation between biomass consumption and grass carp body weight gain was observed, probably due to differences in nutritional quality among macrophyte species according to fish necessities. Therefore, it is concluded that the use of grass carp is one excellent technique to control submersed macrophytes in Brazil.

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