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Mangroves and adjacent habitats as nurseries for Penaeid shrimps at Inhaca island, Mozambique
Stockholm University, Faculty of Science, Department of Systems Ecology.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

x

Place, publisher, year, edition, pages
Stockholm: Institutionen för systemekologi , 2004. , 30 p.
National Category
Ecology
Identifiers
URN: urn:nbn:se:su:diva-141ISBN: 91-7265-814-2 (print)OAI: oai:DiVA.org:su-141DiVA: diva2:190039
Public defence
2004-05-25, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
Opponent
Available from: 2004-05-04 Created: 2004-05-04Bibliographically approved
List of papers
1. Seasonal variation in abundance of four juvenile Penaeid shrimps in a mangrove adjacent intertidal sand flat, Saco da Inhaca, Southern Mozambique
Open this publication in new window or tab >>Seasonal variation in abundance of four juvenile Penaeid shrimps in a mangrove adjacent intertidal sand flat, Saco da Inhaca, Southern Mozambique
(English)Article in journal (Refereed) Submitted
National Category
Biological Sciences
Identifiers
urn:nbn:se:su:diva-23069 (URN)
Available from: 2004-05-04 Created: 2004-05-04 Last updated: 2011-06-23Bibliographically approved
2. Do Penaeid shrimps have a preference for Mangrove habitats?: Distribution pattern analysis on Inhaca island, Mozambique
Open this publication in new window or tab >>Do Penaeid shrimps have a preference for Mangrove habitats?: Distribution pattern analysis on Inhaca island, Mozambique
Show others...
2002 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 55, no 3, 427-436 p.Article in journal (Refereed) Published
Abstract [en]

Scientific information on how penaeid shrimps are distributed within mangrove ecosystems is scarce, which presents an obstacle for fisheries as well as mangrove management. This study investigated the prime nursery microhabitats for the two major commercial species in Mozambique—Penaeus indicus and Metapenaeus monoceros. Stake net enclosures were used to sample shrimps living among unvegetated shallows and mangroves at Inhaca Island, Mozambique, during three consecutive spring tide periods. Four microhabitats were sampled: (1) sand flat; (2) fringe Avicennia marina on sandy substrate; (3) fringe A. marina on muddy substrate; and (4) interior A. marina adjacent to the supratidal terrestrial margin.

P. indicus had a significant preference for fringe mangroves over the adjacent sand flat (P<0·001 and P=0·05). Postlarval shrimps only occupied the sand flat, whereas the mangrove was utilized by postlarval, juvenile and sub-adult life stages. Within the fringe mangrove, there was no correlation between shrimp abundance and organic content of sediment (5·7–11·6 shrimps m−2). Shrimps utilized the most interior margin of the mangroves (0·35 shrimps m−2), although catch rates were significantly lower than in the mangrove fringe (P<0·001). M. monoceros was significantly (P<0·01), more abundant in the sand flat (0·44–2·1 shrimps m−2) than in the mangrove fringe (0·04–0·61 shrimps m−2), although this habitat preference was not evident for juvenile and sub-adult life stages.

The results demonstrate the extensive use of mangrove habitats by penaeid shrimps. The confinement to mangroves for P. indicus, but not for M. monoceros, is discussed in the context of habitat characteristics and predation avoidance behaviour. Methodological considerations of the stake net technique are also outlined.

Keyword
penaeid, shrimps, mangrove, Avicennia marina, intertidal microhabitat preference, stake nets, Mozambique
National Category
Biological Sciences
Identifiers
urn:nbn:se:su:diva-23070 (URN)10.1006/ecss.2001.0916 (DOI)
Available from: 2004-05-04 Created: 2004-05-04 Last updated: 2017-12-13Bibliographically approved
3. Juvenile Penaeid shrimp density, spatial distribution and size composition in four adjacent habitats within a Mangrove fringed bay on Inhaca island, Mozambique
Open this publication in new window or tab >>Juvenile Penaeid shrimp density, spatial distribution and size composition in four adjacent habitats within a Mangrove fringed bay on Inhaca island, Mozambique
2004 (English)In: Western Indian Ocean journal of marine science, ISSN 0856-860X, Vol. 3, no 2, 163-178 p.Article in journal (Refereed) Published
Keyword
penaeid, shrimps, juveniles, distribution, habitats, mudflats, sandflats, mangrove creek, seagrasses, Inhaca Island, Mozambique
National Category
Ecology
Identifiers
urn:nbn:se:su:diva-23071 (URN)
Available from: 2004-05-04 Created: 2004-05-04 Last updated: 2017-12-13Bibliographically approved
4. Thorn fish Terapon jarbua (Forskål) predation on juvenile white shrimp Penaeus indicus H. Milne Edwards and brown shrimp Metapenaeus monoceros (Fabricius): the effect of turbidity, prey density, substrate type and pneumatophore density
Open this publication in new window or tab >>Thorn fish Terapon jarbua (Forskål) predation on juvenile white shrimp Penaeus indicus H. Milne Edwards and brown shrimp Metapenaeus monoceros (Fabricius): the effect of turbidity, prey density, substrate type and pneumatophore density
2003 (English)In: Journal of Experimental Marine Biology and Ecology, ISSN 0022-0981, E-ISSN 1879-1697, Vol. 291, no 1, 29-56 p.Article in journal (Refereed) Published
Abstract [en]

A series of laboratory experiments was conducted at Inhaca Island Marine Biological Station, Mozambique, in order to assess the separate effects of turbidity, prey density, substrate type, pneumatophore density, and the combined effects of turbidity with the latter three, on rate of predation by the thorn fish Terapon jarbua (Forskål, 1775) on white shrimp Penaeus indicus and brown shrimp Metapenaeus monoceros.

Significant interactions between turbidity and the other three factors on shrimp predation for both prey species were detected. Regardless of prey density, increasing turbidity decreased predation on P. indicus, but not on M. monoceros, for which increasing densities reduced the protective effect of turbidity. Increasing prey density increased predation on P. indicus in clear water, and increased predation on M. monoceros in low and high, but not in intermediate turbidity or clear water. The presence of a substrate suitable for burying decreased predation on M. monoceros in clear water, but not in the turbidity levels used. In clear water, solely sandy-shell substrate afforded protection to P. indicus, while in turbid water, no substrate offered significant protection and muddy substrate even increased prey vulnerability to fish probably as a result of increased preys' locomotor activity. Raising pneumatophores density seems to lower the protective value of turbidity for both species. In clear water, only low and high structure density provided a deterrent effect on predation on P. indicus; in turbid water, intermediate and higher structure density increased predation. Increasing structural complexity reduced predation on M. monoceros linearly in clear water; but in low turbid water it increased. In high turbid waters, the increase was only significant in intermediate pneumatophore density. High structural complexities impair the pursuing capacity of fish and thus decreased predation rates. The results indicate that the effective provision of shelter of different habitats depends not only on the various environmental parameters analysed, but also on the way they interact and on the behaviour of prey and predator as well.

Keyword
Teraponidae, Fish predation, Penaeid shrimp, Mangrove, Substratum, Turbidity, Shelter, Synergistic effects
National Category
Biological Sciences
Identifiers
urn:nbn:se:su:diva-23072 (URN)10.1016/S0022-0981(03)00097-2 (DOI)
Available from: 2004-05-04 Created: 2004-05-04 Last updated: 2017-12-13Bibliographically approved
5. The primary carbon sources for juvenile penaeid shrimps in a mangrove-fringed bay at Inhaca island: A dual carbon and nitrogen isotope analysis
Open this publication in new window or tab >>The primary carbon sources for juvenile penaeid shrimps in a mangrove-fringed bay at Inhaca island: A dual carbon and nitrogen isotope analysis
2004 (English)In: Western Indian Ocean journal of marine science, ISSN 0856-860X, Vol. 3, no 2, 151-161 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23073 (URN)
Note
Part of urn:nbn:se:su:diva-141Available from: 2004-05-04 Created: 2004-05-04 Last updated: 2017-12-13Bibliographically approved

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