Size and age at maturity of two strains of the rotifer<i>Brachionus plicatilis</i>in relation to food level

Temprano, Ma. de la Paz; Moreno, Isabel Jaime; Carmona, Marı́a José

doi:10.1080/03680770.1992.11900628

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…In previous studies, it has been shown that lorica length is largely genetically determined (Snell & Carillo 1984; Serra & Miracle 1987). Environmental modification of A is possible, but to a lesser extent: compared with the present study, wider fluctuations in A have been reported previously (5–15%), due to the type of diet (Yúfera 1982; Snell & Carillo 1984; Korstad et al 1989), food availability (Temprano, Moreno, Carmona & Serra 1994; Hansen, Wernberg‐Møller & Wittrup 1997), culture conditions (Suantika, Dhert, Sweetman, O'Brien & Sorgeloos 2003) or hormone addition (Gallardo, Hagiwara, Tomita, Soyano & Snell 1997). This could be attributed to the wider range of conditions tested in the aforementioned studies.…”

Section: Discussioncontrasting

confidence: 48%

“…According to the literature (Gliwicz & Guisande 1992; Kirk 1997), this increased investment in individual offspring (also demonstrated in REV differences between treatments) concomitantly increases the offspring's ability to survive periods of food scarcity, thus conferring higher starvation resistance. Large offspring will eventually develop into large females, which will in turn produce large eggs (Yúfera 1987; Pourriot & Rougier 1991; Temprano et al 1994; Walz et al 1995; Green 1998).…”

Section: Discussionmentioning

confidence: 99%

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Morphometric changes in a strain of the lineage ‘Nevada’, belonging to theBrachionus plicatilis(Rotifera) complex

Kostopoulou

Miliou

Verriopoulos

2009

Aquaculture Research

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The rotifer Brachionus plicatilis is an important component of aquaculture as a larval feed. Its taxonomic status has been recently re‐defined as a species complex, consisting of at least 14 new species/lineages. This study deals with the lineage Brachionus‘Nevada’, which has been shown to occur in European hatcheries. A strain of B. ‘Nevada’ was mass cultured using two commonly applied feeding regimes and analysed in terms of its morphometry. A new formula was proposed for the calculation of volume, which can be used as an index of adequacy of rotifers as feed for fish larvae. The results were related to life cycle parameters. The pre‐reproductive and reproductive phases were divided into distinct size groups. Differences were also found between the two diets in morphometry and demography. Rotifers of a larger size (yeast‐based diet) showed a lower growth rate and a longer reproductive period, lifespan and mean generation time compared with smaller‐sized rotifers (Culture Selco®‐based diet). In terms of lorica length, the present study's strain of B. ‘Nevada’ (238.5 μm) was intermediate between values reported for Brachionus ibericus (193.5 μm) and B. plicatilis sensu stricto (299 μm).

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Section: Discussioncontrasting

confidence: 48%

Section: Discussionmentioning

confidence: 99%

Morphometric changes in a strain of the lineage ‘Nevada’, belonging to theBrachionus plicatilis(Rotifera) complex

Kostopoulou

Miliou

Verriopoulos

2009

Aquaculture Research

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“…a total amount of 532 hatchlings). Hatchling survival was high; 99.4% of hatchlings survived more than 48 h, which is sufficient time for B. plicatilis to become reproductively mature (Temprano et al. , 1994).…”

Section: Resultsmentioning

confidence: 99%

Hatching and viability of rotifer diapausing eggs collected from pond sediments

2006

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1. Planktonic rotifers inhabiting variable environments produce diapausing eggs that accumulate in the sediment of lakes and ponds, forming egg banks that may withstand adverse periods. A common assumption in zooplankton diapausing egg bank studies is to count as viable all eggs in the sediment that look healthy. This assumption should be challenged by asking how effectively 'healthy-looking' eggs represent viable eggs. 2. In this study, viability of more than 1100 'healthy-looking' diapausing eggs belonging to the Brachionus plicatilis species complex was assessed in a laboratory hatching experiment. Eggs were collected at different depths from sediment cores obtained from 15 ponds located in coastal and inland areas of Eastern Spain. 3. Only approximately one half of the 'healthy-looking' diapausing eggs hatched after incubation in experimental conditions. Almost all the hatchlings (99.4%) survived to maturity. The proportion of 'healthy-looking' diapausing eggs that hatched varied among areas and among ponds within area, and substantially declined with sediment depth. Most of the hatchlings (88%) were obtained from the uppermost 2 cm of sediment. 'Healthylooking' eggs from upper sediment layers hatched after significantly shorter incubation times than eggs recovered from deeper layers. 4. Both decreased hatching success and increased incubation time for hatching with sediment depth suggest that older 'healthy-looking' eggs are less responsive to hatching stimuli and could become unviable. However, the strong correlation found between the number of 'healthy-looking' eggs and the number of hatchlings indicates that the abundance of 'healthy-looking' eggs is a good index of egg bank viability.

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“…Σύμφωνα με προηγούμενες μελέτες (Snell & Carillo 1984;Serra & Miracle 1987), το μέγεθος καθορίζεται γενετικά και επομένως δεν υπόκειται σε μεγάλες διαφοροποιήσεις. Όντως, οι διαφοροποιήσεις που έχουν καταγραφεί, ως προς το μήκος του σώματος (ΜΣ) -οφειλόμενες στον τύπο (Yufera 1982;Snell & Carillo 1984) και την ποσότητα της τροφής (Temprano et al 1994;Hansen et al 1997), τις συνθήκες εκτροφής (Suantika et al 2003;Hagiwara et al 2007) ή την προσθήκη ορμονών (Gallardo et al 1997) -κυμαίνονται μεταξύ 5 -20%.…”

Section: θηλυκά χωρίς αυγάunclassified

“…Με άλλα λόγια, αποκτούν μεγαλύτερη αντοχή στην ασιτία (Kirk 1997b για τα Τροχοφόρα;Goulden et al 1982;Tessier et al 1983; για τα Κλαδοκεραιωτά). Οι μεγαλύτεροι σε μέγεθος απόγονοι θα δώσουν αντίστοιχα μεγαλύτερα παρθενογενετικά θηλυκά, τα οποία θα γεννήσουν με τη σειρά τους μεγαλύτερα αυγά (Yùfera 1987;Pauli 1989;Pourriot & Rougier 1991;Temprano et al 1994;Ricci 1995;Walz et al 1995;Green 1998;Navarro & Yùfera 1998;Wallace et al 1998;Stelzer 2002 Daphnia Boersma 1995;McKee & Ebert 1996), στα Κωπήποδα (Auel 2004), καθώς και σε άλλα είδη Τροχοφόρων (Guisande & Mazuelos 1991;Galindo et al 1993). Με άλλα λόγια, αύξηση του μεγέθους των απογόνων θα πρέπει να συνοδεύεται από ταυτόχρονη μείωση του αριθμού τους, ενώ το αντίθετο θα πρέπει να ισχύει, όταν αυξάνεται η τροφή.…”

Section: θηλυκά χωρίς αυγάunclassified

Δυναμική πληθυσμών και στρατηγική αναπαραγωγής του τροχοφόρου Brachionus βιότυπου Nevada σε σχέση με την τροφή

Κωστοπούλου¹

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Σκοπός της μελέτηςΚεφάλαιο 1 -Εισαγωγή στη βιολογία των Τροχοφόρων, με έμφαση στο Brachionus plicatilis s.l. 1.1 .Μορφολογία 1.2.Ταξινομική 12 1.3. Αναπαραγωγή 23 1 ΑΔυναμική πληθυσμών 34 1.5.Στοιχεία φυσιολογίας και οικολογίας 40 1.6.Ρόλος στις υδατοκαλλιέργειες 53 Κεφάλαιο 2 -Μελέτη της δυναμικής του Τροχοφόρου Brachionus 'Nevada' σε πληθυσμιακό επίπεδο 2.1.Εισαγωγή 2.2.Υλικάκαι μέθοδοι 2.3 .Αποτελέσματα 2.4.Συζήτηση Κεφάλαιο 3 -Μελέτη της δυναμικής του Τροχοφόρου Brachionus 'Nevada' σε ατομικό επίπεδο 3.1.Εισαγωγή 3.2.Υλικά και μέθοδοι 3.3 .Αποτελέσματα 3.4.Συζήτηση Κεφάλαιο 4 -Μορφομετρία και βιοχημική σύσταση του Τροχοφόρου Brachionus 'Nevada' 4.1.Εισαγωγή 4.2.Υλικά και μέθοδοι 4.3. Αποτελέσματα 4.4.Συζήτηση Κεφάλαιο 5 -Παρθενογενετική και αμφιγονική αναπαραγωγή του Τροχοφόρου Brachionus 'Nevada' 5.1.Εισαγωγή 5.2.Υλικά και μέθοδοι 5.3. Αποτελέσματα

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Size and age at maturity of two strains of the rotiferBrachionus plicatilisin relation to food level

Cited by 5 publications

References 16 publications

Morphometric changes in a strain of the lineage ‘Nevada’, belonging to theBrachionus plicatilis(Rotifera) complex

Morphometric changes in a strain of the lineage ‘Nevada’, belonging to theBrachionus plicatilis(Rotifera) complex

Hatching and viability of rotifer diapausing eggs collected from pond sediments

Δυναμική πληθυσμών και στρατηγική αναπαραγωγής του τροχοφόρου Brachionus βιότυπου Nevada σε σχέση με την τροφή

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