Consulta: subjectFacets:"Copepoda [copepods]"
Registros recuperados: 8
Data/hora: 09/06/2024 02:55:08

A comparison between models describing the influence of temperature on the development rate of copepods
Provedor de dados: 27
Autores: Heip, C.H.R.
Four mathematical expressions relating development time to temperature are compared. All four yield good predictions of the development rate of the copepod &lt;i&gt;Tachidius discipes&lt;/i&gt;. The use of the equation of Belehradek is criticized. It is concluded that the power equation D= aT&lt;sup&gt;b&lt;/sup&gt; gives the best approximation in this case.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature effects; Copepoda [copepods].
Ano: 1974
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3496

Critique of some practices in life-history studies, with special references to harpacticoid copepods
Provedor de dados: 27
Autores: Bergmans, M.
Published studies on the demography and reproductive strategies of harpacticoid copepods are examined critically. At the technical level, the popular approximation &lt;i&gt;r&lt;/i&gt; = ln R&lt;sub&gt;0&lt;/sub&gt;/T&lt;sub&gt;c&lt;/sub&gt; is shown to be inappropriate as an estimate of the intrinsic rate of increase of harpacticoids. It leads to a systematic underestimation, by 8-29%, for life histories typical of fast-breeding species. Various &lt;i&gt;ad hoc&lt;/i&gt; variants of &lt;i&gt;r&lt;/i&gt; and &lt;i&gt;R&lt;sub&gt;0&lt;/sub&gt;&lt;/i&gt; calculations occurring in the literature are also criticized. At the conceptual level, a more discriminating approach to life-history characteristics is necessary; this applies both to the assessment of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Life history; Copepoda [copepods].
Ano: 1984
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3311

The culturing of some harpacticoid copepods from brackish water
Provedor de dados: 27
Autores: Smol, N.; Heip, C.H.R.
A culture method for three copepods from a brackish water pond in northern Belgium was established. The investigated species reproduced best on a diet of algae (&lt;i&gt;Tetraselmis suecica&lt;/i&gt; and &lt;i&gt;Phaeodactylum tricornutum&lt;/i&gt;) with addition of small amount of detritus from the habitat. Survival from nauplii to the adult stage varied between 60 and 90 %. A study of the influence of temperature showed that the duration of the naupliar stages of &lt;i&gt;Tachidius discipes&lt;/i&gt; is relatively prolonged with increasing temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuarine organisms; Copepoda [copepods].
Ano: 1974
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3497

The influence of competition and predation on production of meiobenthic copepods
Provedor de dados: 27
Autores: Heip, C.H.R.
An assemblage of meiobenthic copepods was monitored twice monthly between 1968 and 1976 in a shallow brackish water habitat. Four species dominated and accounted for nearly all the production. All species have only one or two generations per year and each peak has similar dynamic characteristics. Production is determined primarily by the number of generations, and it is suggested that competition and predation determine the life-history characteristics.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Predation; Copepoda [copepods].
Ano: 1980
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6999

The predictability of biological populations and communities: an example from the meiobenthos
Provedor de dados: 27
Autores: Herman, P.M.J.; Heip, C.H.R.
The predictability of temporal changes was analysed in the population density of three meiobenthic copepod species, and for three parameters characterizing this community. For &lt;i&gt;Paranychocamptus nanus&lt;/i&gt; and &lt;i&gt;Tachidius discipes&lt;/i&gt; a large part of the variation in time scales longer than 1 year is explainable as cyclic factors. In &lt;i&gt;P. nanus&lt;/i&gt; clear cycles with periods of 2 years and 1.5 years were found. These cyclic factors can be extrapolated for prediction. In &lt;i&gt;Canuella perplexa&lt;/i&gt; almost all the variation was due to unpredictable long-term drift. Community parameters are generally better predicted than population densities. In our data set total density of the copepods was the best parameter to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meiobenthos; Monitoring; Prediction; Time series; Copepoda [copepods].
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3238

The respiration of five brackish-water harpacticoid copepod species
Provedor de dados: 27
Autores: Herman, P.M.J.; Heip, C.H.R.
The dependency of respiration rate on body weight at 20°C was determined for five meiobenthic copepods from a brackish-water habitat. The respiration rate of the four smaller species was generally high, = 10-14 nl O&lt;sub&gt;2&lt;/sub&gt;.h&lt;sup&gt;-1&lt;/sup&gt;.µg dry wt&lt;sup&gt;-1&lt;/sup&gt;, but was much lower for larger species, &lt;i&gt;Canuella perplexa&lt;/i&gt; T. &amp; A. Scott 1893 (2-3 nl O&lt;sub&gt;2&lt;/sub&gt;.h&lt;sup&gt;-1&lt;/sup&gt;.µg&lt;sup&gt;1&lt;/sup&gt;). This pattern is discussed in terms of the adaptive behaviour of the populations. The significance of respiration rates in the evolution of populations is illustrated by differences between the respiration rates of Belgian &lt;i&gt;Tachidius discipes&lt;/i&gt; Giesbrecht...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Respiration; Copepoda [copepods]; Harpacticoida.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3288

Measuring selectivity of feeding by estuarine copepods using image analysis combined with microscopic and Coulter counting
Provedor de dados: 27
Autores: Tackx, M.L.M.; Zhu, L.; De Coster, W.; Billones, R.G.; Daro, M.H.
Although estuarine zooplankters are generally believed to be detritivorous, high clearance rates by the estuarine copepods &lt;i&gt;Eurytemora affinis&lt;/i&gt; and &lt;i&gt;Acartia tonsa&lt;/i&gt; on natural estuarine microplankton have been reported in the literature. In order to enable detection of possible selectivity for these microplankton organisms over detritus, a method that measures clearance rates on total particulate matter is proposed. Image analysis is used to measure copepod gut contents, and combined with Coulter counter measurements of total particulate matter concentration, allows one to calculate clearance rates on the latter. The first results indicate that, in the Westerschelde estuary (SW Netherlands), both &lt;i&gt;E....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuarine organisms; Feeding behaviour; Image processing; Selective feeding; Acartia tonsa; Copepoda [copepods]; Eurytemora affinis.
Ano: 1995
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2632

A seasonally varying biotope at Signy Island, Antarctic: implications for meiofaunal structure
Provedor de dados: 27
Autores: Vanhove, S.; Beghyn, M.; Van Gansbeke, D.; Bullough, L.W.; Vincx, M.
Under the typical high-latitude conditions of temperature, productivity and settlement of chlorophyll and phaeophytin to the sediment, many benthic organisms in the Antarctic show strong seasonal variation. Although meiofauna comprise an important component of the southpolar benthic ecosystem, our knowledge of them is limited. The metazoan meiofauna and the surrounding sediments were studied fortnightly for 18 mo in a shallow bay at Signy Island (Factory Cove, South Orkneys, Antarctica) to test whether and how the temporal variability of the environment influenced meiobenthos dynamics. By examination of the distribution of the abundance and biomass of the total community, the density of higher taxonomic groups, and of individual dominant nematode genera...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthos; Biomass; Population density; Seasonal variations; Sediment analysis; Trophic relationships; Copepoda [copepods]; Nematoda [Nematodes]; Ostracoda.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6138