scholarly journals Life in the fast lane: Temperature, density and host species impact survival and growth of the fish ectoparasite Argulus foliaceus

2020 ◽  
Vol 92 ◽  
pp. 102687
Author(s):  
Rhi Hunt ◽  
Jo Cable
Keyword(s):  
Host Species ◽  
Survival And Growth ◽  
Argulus Foliaceus ◽  
Fast Lane

The effects of management regime and host species on Sandalwood (Santalum spicatum) recruitment near Paynes Find Western Australia.

2000 ◽  
Vol 22 (2) ◽  
pp. 243 ◽  
Author(s):  
JE Brand
Keyword(s):  
Seed Dispersal ◽  
Western Australia ◽  
Host Species ◽  
Management Strategies ◽  
Management Regime ◽  
Host Trees ◽  
Foliar Concentrations ◽  
Survival And Growth ◽  
Santalum Spicatum ◽  
Natural Recruitment

Natural recruitment of sandalwood (Santalum spicatum) is generally low in pastoral regions of the Midwest and Goldfields, Western Australia. Harvesting of S, spicatum for the aromatic timber occurs in these regions, creating a need to develop management strategies to conserve the species. This paper examines sandalwood recruitment over three years within a natural stand of 32 ha, near Paynes Find, Western Australia. Santalum spzcatum recruitment success was compared between three establishment treatments, and between two fencing treatments (+I-). At age three years, mean survival of S. spicatum seedlings planted next to host trees (25%) was significantly higher than those planted at harvesting spots (2%) and beneath parent trees (0%). In the unfenced treatment, there was evidence of grazing and S, spicatum survival and growth were significantly lower than in the fenced treatment. However, fencing alone did not improve S. spicatum recruitment because natural seed dispersal was poor and survival beneath parent trees was low. De-stocking, combined with seed enriching host trees is recommended to dramatically improve S, spicatum recruitment in the Paynes Find region. Santalum spicatum seedling performance was compared growing next to three N2-fixing species (Acacia burkittii, A. tetragonophylla and A. ramulosa) and one non N2-fixing species (Hakea recurva). At age three years, S. spicatum survival was significantly higher next to A. burkittii (33%) than A. tetragonophylla (1 7%). Santalum spicatum survival next to A. ramulosa and H. recurva was 24-26%. Fencing improved S. spicatum survival next to A. burkittii, and to a lesser extent next to A. tetragonophylla and A. ramulosa. In contrast, survival of S, spicatum seedlings next to H. recurva was unaffected by fencing. Santalum spicatum growth next to each host species was slow and significantly higher in the fencing treatment. Foliar concentrations of N, P, K and Ca were the same across 5'. spicatum treatments, but the concentration of Mg varied. The foliar K:Ca ratio was also similar between S. spicatum treatments, ranging from 1.4 to 2.0. Key words: Santalum spicatum, recruitment, seed enrichment, host species, foliar nutrients

Life in the Fast Lane

2004 ◽  
Author(s):  
LeeNagi Powers
Keyword(s):  
Fast Lane

Twins in the Fast Lane

2007 ◽  
Vol 32 (2) ◽  
pp. 30-31
Author(s):  
Paul M. Gallo ◽  
Aaron W. Bernard
Keyword(s):  
Fast Lane

Coral husbandry for ocean futures: leveraging abiotic factors to increase survivorship, growth, and resilience in juvenile Montipora capitata

2021 ◽  
Vol 657 ◽  
pp. 123-133
Author(s):  
JR Hancock ◽  
AR Barrows ◽  
TC Roome ◽  
AS Huffmyer ◽  
SB Matsuda ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Larval Rearing ◽  
Abiotic Conditions ◽  
Montipora Capitata ◽  
Reef Restoration ◽  
Juvenile Corals ◽  
Bleaching Response ◽  
The Face ◽  
Survival And Growth ◽  
Global And Local

Reef restoration via direct outplanting of sexually propagated juvenile corals is a key strategy in preserving coral reef ecosystem function in the face of global and local stressors (e.g. ocean warming). To advance our capacity to scale and maximize the efficiency of restoration initiatives, we examined how abiotic conditions (i.e. larval rearing temperature, substrate condition, light intensity, and flow rate) interact to enhance post-settlement survival and growth of sexually propagated juvenile Montipora capitata. Larvae were reared at 3 temperatures (high: 28.9°C, ambient: 27.2°C, low: 24.5°C) for 72 h during larval development, and were subsequently settled on aragonite plugs conditioned in seawater (1 or 10 wk) and raised in different light and flow regimes. These juvenile corals underwent a natural bleaching event in Kāne‘ohe Bay, O‘ahu, Hawai‘i (USA), in summer 2019, allowing us to opportunistically measure bleaching response in addition to survivorship and growth. This study demonstrates how leveraging light and flow can increase the survivorship and growth of juvenile M. capitata. In contrast, larval preconditioning and substrate conditioning had little overall effect on survivorship, growth, or bleaching response. Importantly, there was no optimal combination of abiotic conditions that maximized survival and growth in addition to bleaching tolerances. This study highlights the ability to tailor sexual reproduction for specific restoration goals by addressing knowledge gaps and incorporating practices that could improve resilience in propagated stocks.

Mechanisms leading to recruitment inhibition of giant kelp Macrocystis pyrifera by an understory alga

2021 ◽  
Vol 657 ◽  
pp. 59-71
Author(s):  
BA Beckley ◽  
MS Edwards
Keyword(s):  
Field Experiments ◽  
Local Community ◽  
Kelp Forest ◽  
Macrocystis Pyrifera ◽  
Forest Recovery ◽  
Kelp Forests ◽  
Giant Kelp ◽  
Combined Effects ◽  
Life Stages ◽  
Survival And Growth

The forest-forming giant kelp Macrocystis pyrifera and the communities it supports have been decreasing across their native ranges in many parts of the world. The sudden removal of giant kelp canopies by storms increases space and light for the colonization by understory macroalgae, such as Desmarestia herbacea, which can inhibit M. pyrifera recovery and alter local community composition. Understanding the mechanisms by which algae such as D. herbacea interact with M. pyrifera can provide insight into patterns of kelp forest recovery following these disturbances and can aid in predicting future community structure. This study experimentally tested the independent and combined effects of two likely competitive mechanisms by which D. herbacea might inhibit recovery of M. pyrifera in the Point Loma kelp forest in San Diego, California (USA). Specifically, we conducted field experiments to study the individual and combined effects of shade and scour by D. herbacea on the survival of M. pyrifera microscopic life stages, and the recruitment, survival, and growth of its young sporophytes. Our results show that scour had the strongest negative effect on the survival of M. pyrifera microscopic life stages and recruitment, but shade and scour both adversely affected survival and growth of these sporophytes as they grew larger. Canopy-removing storms are increasing in frequency and intensity, and this change could facilitate the rise of understory species, like D. herbacea, which might alter community succession and recovery of kelp forests.

The Influence of Stocking Density On Survival and Growth of Buenos Aires Tetra (Hemigrammus Caudovittatus) Larvae Reared Under Controlled Conditions

2008 ◽  
Vol 23 (4) ◽  
pp. 881-887 ◽  
Author(s):  
Krzysztof Kupren ◽  
Dariusz Kucharczyk ◽  
Maja Prusińska ◽  
Sławomir Krejszeff ◽  
Katarzyna Targońska ◽  
...  
Keyword(s):  
Buenos Aires ◽  
Stocking Density ◽  
Controlled Conditions ◽  
Survival And Growth

Metazoan Parasites and Health State of European Eel, Anguilla Anguilla (Anguilliformes, Anguillidae), From Tonga Lake and El Mellah Lagoon in the Northeast of Algeria

2018 ◽  
Vol 52 (4) ◽  
pp. 279-288 ◽  
Author(s):  
F. Bakaria ◽  
S. Belhaoues ◽  
N. Djebbari ◽  
M. Tahri ◽  
I. Ladjama ◽  
...  
Keyword(s):  
Brackish Water ◽  
Parasite Species ◽  
Anguilla Anguilla ◽  
European Eel ◽  
Health State ◽  
Component Community ◽  
Metazoan Parasites ◽  
Parasite Communities ◽  
High Dominance ◽  
Argulus Foliaceus

Abstract The aim of the study was to examine metazoans parasite communities of European eels (Anguilla anguilla) in freshwater (Tonga Lake) and brackish water (El Mellah lagoon) in the northeast of Algeria. Six parasite taxa were collected: one monogenean, Pseudodactylogyrus sp.; two crustaceans, Ergasilus sp. and Argulus foliaceus; two nematodes, Cucullanus sp. and Anguillicola crassus; one cestode, Bothriocephalus claviceps. Th e most prevalent parasite taxa in freshwater were Pseudodactylogyrus sp., A. crassus and Bothriocephalus claviceps; whereas in the brackish water, eels were infected mainly with A. crassus. Th e characteristics of the parasite component community structure revealed low parasite species diversity and high dominance values in eels from the two localities. Both communities were dominated by a single parasite species: Tonga eels by the monogenean Pseudodactylogyrus sp. and El Mellah lagoon eels by the nematode A. crassus, verified by high Berger-Parker dominance values of 0.76 and 0.87 respectively.

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