GLORIA — GEOMAR Library Ocean Research Information Access

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The two Mytilids Aulacomya atra and Mytilus chilensis from the Chilean Fjord region : aspects of population dynamics, production and metabolism (2012)

Müller, Jens [VerfasserIn]

Kiel

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Schlagwort(e): Hochschulschrift

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (49 Seiten = 4 MB) , Illustrationen, Graphen

Ausgabe: 2022

URL: https://oceanrep.geomar.de/23178/

Sprache: Englisch

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Succession of benthic hard bottom communities in the shallow sublittoral of Comau Fjord, Chile (2013)

Reichel, Lisa [VerfasserIn]

Kiel

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Schlagwort(e): Hochschulschrift

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (63 Seiten = 4 MB) , Illustrationen, Graphen, Karten

Ausgabe: Online-Ausgabe

URL: https://oceanrep.geomar.de/id/eprint/23187/

Sprache: Englisch

Anmerkung: Zusammenfassung in deutscher und englischer Sprache

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In situ short-term growth rates of a cold-water coral (2013)

Jantzen, Carin ; Laudien, Jürgen ; Sokol, Stefanie ; [weitere]

CSIRO

In: Marine and Freshwater Research, 64 (7). pp. 631-641.

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Publikationsdatum: 2019-09-23

Beschreibung: Cold-water corals are known to grow much slower than their tropical counterparts. However, this assumption is mainly based on laboratory measurements exposing specimens to conditions that differ from their natural environments. The cosmopolitan scleractinian Desmophyllum dianthus forms dense banks below 18 m in northern Patagonia, Chile. So as to measure in situ growth rates of this cold-water coral, specimens were collected from two sites, weighed and deployed on holders in their natural headlong orientation at the respective collecting site. Corals exhibited a calcium carbonate (CaCO3) mass increase of 5.44 ± 3.45 (mg (cm2 projected calyx area)–1 day–1) after 2 weeks, equivalent to a mass gain of 0.25 ± 0.18 s.d. % day–1. In comparison, D. dianthus specimens from the same collection sites maintained in an on-site flow-through aquarium system showed lower growth rates that were third of the in situ rates. In situ CaCO3 precipitation of D. dianthus extrapolated for 1 year (kg m2 year–1) displays the same order of magnitude as reported for massive growing tropical scleractinians, e.g. Porites sp.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1071/MF12200

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Early Larval Development ofDonax obesulus: Response to El Nino Temperature and Salinity Conditions (2010)

Carstensen, Daniel ; Laudien, Jürgen ; Sielfeld, Walter ; [weitere]

BioOne

In: Journal of Shellfish Research, 29 (2). pp. 361-368.

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Publikationsdatum: 2020-07-20

Beschreibung: The Humboldt Current System is a highly productive ecosystem that is subject to the dynamics of the El Niño Southern Oscillation (ENSO). El Niño (EN, the warm phase of ENSO) causes vital changes in surface water temperature, oxygen levels, and salinity conditions, which arc reflected in various responses of coastal pelagic and benthic organisms. For very shallow habitats such as sandy beaches, temperature and salinity are considered the principal parameters changing during strong EN. However, the mechanisms by which these changes effect change on the structure of coastal populations remains largely unknown. The surf clam Donax ohesulus is dominant on large sandy beaches of the Humboldt Current System. Its biogeographical distribution is largely influenced by EN-induced environmental changes. Despite the species' key role in the beach ecosystem, the effects of modified abiotic conditions on the meroplanktonic larval stages and threshold temperatures involved have not yet been investigated. After EN episodes, meroplanktonic larval stages play a crucial role in the medium- and long-term stability of shallow-water species. Thus, this study makes a first attempt to describe the ontogeny of D. ohesulus and examines the effects on development of EN temperature conditions (ENTC) in comparison with normal temperature conditions (NTC). Results indicate that early life history follows a pattern previously described for other donacid bivalves. Development, growth, and mortality of larvae were assessed during a 3-wk in vitro experiment, indicating that larvae reared under ENTC grew and developed faster in comparison with those reared under NTC; mortality was slightly higher under ENTC. During a 2nd experiment, larvae were exposed for 48 h to a distinct range of different salinities (35, 25, 15, and 5 ± 1) at 2 different temperatures (NTC and ENTC). At both temperatures, larvae suffered no mortality at medium and low salinity (35, 25, and 15 ± 1) but showed 100% mortality at very low salinity (5 ± 1) after 16 h at NTC and 32 h at ENTC. Activity of larvae was highest at medium salinity (25 ± 1) and lowest at normal salinity (35 ± 1). The results of this study indicate that early larval stages of D. ohesulus can cope with temperature and salinity changes induced during EN. Only extremely low salinity (5 ± 1) such as that observed close to river mouths may cause high mortality rates in D. ohesulus offspring.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.2983/035.029.0211

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A contribution to the understanding of phylogenetic relationships among species of the genus Octopus (Octopodidae: Cephalopoda) (2012)

Acosta-Jofré, María Soledad Sahade, Ricardo Laudien, Jürgen Chiappero, Marina B.

Institut de Ciències del Mar de Barcelona, CSIC

In: Scientia Marina

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Publikationsdatum: 2012-06-23

Beschreibung: Many species of the genus Octopus are important resources for fisheries worldwide. Its approximately 200 species show a strong similarity in structural morphology and a wide diversity in skin coloration and patterning, behaviour and life strategies that have hampered the study of phylogenetic relationships. We used a Bayesian approach to estimate as yet unknown phylogenetic relationships among O. tehuelchus from the southwestern Atlantic, new specimens of O. mimus (Chile and Peru) and other Octopus species, and used Bayes factors to test phylogenetic hypotheses. O. tehuelchus was more closely related to the genera Callistoctopus , Grimpella and Macroctopus than to Octopus , and therefore its generic placement may need a revision. O. vulgaris specimens from Costa Rica (Pacific Ocean) and O. oculifer grouped with O. mimus. Bayes factors showed positive evidence in favor of this grouping and therefore these individuals could have been misidentified, being in fact O. mimus. O. vulgaris specimens from the Costa Rican Caribbean were more related to O. mimus than to other O. vulgaris and could represent a cryptic species. The remaining O. vulgaris clustered with O. tetricus . Bayes factors found strong evidence against the monophyly of O. vulgaris as currently defined, giving statistical support to the monophyly of an O. vulgaris s. str. + O. tetricus group proposed previously by other authors.

Print ISSN: 0214-8358

Digitale ISSN: 1886-8134

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Publiziert von Institut de Ciències del Mar de Barcelona, CSIC

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Primary succession of arctic hard-bottom assemblages – insights from a long-term in situ-experiment (2014)

Streicher, Michael ; Laudien, Jürgen ; Sahade, Ricardo

YouMaRes 5

In: EPIC3YouMaRes 5, Ozeaneum, Stralsund, Germany, 2014-09-10-2014-09-12Ozeaneum, Stralsund, Germany, YouMaRes 5

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Publikationsdatum: 2014-09-15

Beschreibung: For marine invertebrates living at low temperatures of high latitudes Thorson’s rule suggests a comparatively reduced speed of development. Several studies conducted in different climatic zones have revealed the processes involved in the maturation of benthic assemblages. However, the duration and chronology of succession, as well as the influence of environmental impacts on arctic benthic assemblages is only scarcely analysed. Long-term studies are still rare. By analysing species abundances and substrate coverage over an exposure time of one decade the following hypotheses are tested: (i) Exposition time significantly modifies the structure of arctic benthic hard-bottom assemblages, (ii) the macroscopic structure of the substrate surface has a significant influence on the structure of benthic hard-bottom assemblages, and (iii) the succession of benthic hard-bottom assemblages in the Arctic is in general slower compared to the benthic succession in all non-polar climatic zones. In 2002 forty Polyethylene growth panels were installed on an underwater cliff in Kongsfjorden (Svalbard, Norway) in about 20 m water depth. Six of these were grooved to create structural diversity on the panel surface. Once a year the ripening epibenthic assemblages were photographed by scientific divers. Until 2007 annually about eight panels were sampled and replaced, thus creating starting points for succession in different years. Additionally a ground truthing was carried out for reference. The findings of this study indicate a resilience time exceeding a decade. A strong heterogeneity can be observed between the assemblages on different panels, signifying an influence of different starting points. The results are discussed in comparison with results of related studies from this and other cold-water regions.

Repository-Name: EPIC Alfred Wegener Institut

Materialart: Conference , notRev

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ARTIKEL (OA)

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Donax pulchellus and Donax rugosus on Sandy Beaches, Ghana (2014)

Givty Akita, Lailah ; Laudien, Jürgen ; Kojo Armah, Ayaa

LAP Lambert Academic Publishing

In: EPIC3Saarbrücken, LAP Lambert Academic Publishing, 148 p., ISBN: 978-3-659-54304-3

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Publikationsdatum: 2016-11-24

Beschreibung: Donax species dominate the intertidal zone of coastal upwelling sandy beaches worldwide. The population dynamics of West African D. pulchellus and D. rugosus is still unknown. The population dynamics and ecology of surf clam Donax species, D. pulchellus and D. rugosus (Bivalvia: Donacidae), inhabiting two exposed sandy beaches of Ghana, were studied over 12 months period (August 2006 to July 2007). A total of 7,225 individuals of D. pulchellus, La beach and 2,452 individuals of D. rugosus, Chorko beach, were sampled. Two-way analysis of variance revealed a significant difference in the spatial and temporal distribution of the two species (p 〈 0.05). D. pulchellus attains first maturity at a mean length of 7.16 + 1.89 mm, and a maximum size of 11 mm while D. rugosus attains first maturity at a mean length of 20.94 + 6.98 mm, and a maximum size of 33.5 mm. Environmental factors namely, salinity, nitrate, and grain size modulate the growth in shell length of the two species. This book, provide new insight of Donax species as sedentary bivalves of sandy beach ecosystems. The book is useful for marine biologist, benthic ecologist, environmentalist, and chemical ecologist.

Repository-Name: EPIC Alfred Wegener Institut

Materialart: Book , peerRev

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El Niño induced changes of the coastal fish fauna off northern Chile and implications for ichthyogeography (Cambios de la fauna íctica del norte de Chile inducidos por El Niño y sus implicancias en la ictiogeografía) (2010)

Sielfeld, Walter ; Laudien, Jürgen ; Vargas, Mauricio ; [weitere]

Universidad de Valparaíso

In: EPIC3Revista de Biología Marina y Oceanografía, Universidad de Valparaíso, 45(S1), pp. 705-722, ISSN: 0718-1957

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Publikationsdatum: 2017-11-01

Beschreibung: The coastal fringe off northern Chile (18º-23ºS) is inhabited by numerous neritic fish species of which 249 are commonly observed during normal and cold La Niña (LN) conditions. During El Niño (EN) the ichthyofauna of northern Chile changes significantly due to about 100 invading fish species normally inhabiting lower latitudes, named “septentrional invaders” and “tropic-equatorial fishes”. This results in a composition including 15 fish families and 86 genera. Analyses showed that species affected by EN were not the same between the last three EN events revealing that only the epipelagic species Anchoa naso, Albula vulpes, Atherinella nocturna and Scomberesox saurus stolatus behaved consistently. Off northern Chile, EN 1982/83, 1986/87, 1991/92, 1997/98, 2002/2003 and the not clearly EN defined 2004/2005 period with their aligned thermal abnormalities of each particular event were directly related to the number of invading/affected species. Most of the alien species (〉50%) were epipelagic, 25% were typical for sandy beaches and 14.6% for rocky shores. The shore fish community did not show major changes during and after EN events, as only a few invading species were recorded; just Umbrina xantii was found during all events considered. In order to understand the response of the fish community to ENSO events a biogeographical analyses of 721 fish species reported for neritic habitats (coastal epipelagic and benthic) distributed between 0°-57°S (Gulf of Guayaquil to Cape Horn) was made. Their distribution ranges for normal oceanic conditions were taken from the very numereous existing literature. It is concluded that the north/south migration of Panamic and Peruvian warm water fishes during EN/LN events along the north Chilean coast between 18º-23ºS, indicates that it represents a wide transition zone between the Peruvian and the Chilean ichthyogeographic provinces.

Repository-Name: EPIC Alfred Wegener Institut

Materialart: Article , isiRev

Format: application/pdf

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