Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)
ABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat w...
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| Format: | Article |
| Language: | English |
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Fundação Zoobotânica do Rio Grande do Sul
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| Series: | Iheringia: Série Zoologia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227&lng=en&tlng=en |
| _version_ | 1828188672935067648 |
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| author | Jersei N. Silva Guilherme de Oliveira Sérgio S. da Rocha |
| author_facet | Jersei N. Silva Guilherme de Oliveira Sérgio S. da Rocha |
| author_sort | Jersei N. Silva |
| collection | DOAJ |
| description | ABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex ratio was biased towards females in M1 and did not deviate from 1:1 in M2 and M3. When prawns were separated into five categories we observed that non-ovigerous adult females were more abundant in M1, while adult males were the most abundant demographic category in M2 and M3. Juveniles of both sexes and ovigerous females showed no microhabitat preference, although M1 and M2 appeared to be more suitable for the latter. Adult females were the largest individuals in all microhabitats. Food availability, lower depth and lower predation pressure in M1 are the main factors that make M1 more suitable for M. jelskii, particularly non-ovigerous adult females and larger adult males. Intraspecific competition for shelter in M1 might also occur and adult females win this competition due to their larger body size. Therefore, adult males are found in higher abundance in M2 and M3 and the juvenile of both sexes spread evenly across all microhabitats. Our results help to understand the ecological role and the niche used by M. jelskii. Future studies on the habitat choice and predation under laboratory conditions should help to understand the behavior of this species. |
| first_indexed | 2024-04-12T07:54:06Z |
| format | Article |
| id | doaj.art-13f3cde5a5c94fe9966f9e2589cd4c94 |
| institution | Directory Open Access Journal |
| issn | 1678-4766 |
| language | English |
| last_indexed | 2024-04-12T07:54:06Z |
| publisher | Fundação Zoobotânica do Rio Grande do Sul |
| record_format | Article |
| series | Iheringia: Série Zoologia |
| spelling | doaj.art-13f3cde5a5c94fe9966f9e2589cd4c942022-12-22T03:41:32ZengFundação Zoobotânica do Rio Grande do SulIheringia: Série Zoologia1678-476610910.1590/1678-4766e2019027S0073-47212019000100227Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae)Jersei N. SilvaGuilherme de OliveiraSérgio S. da RochaABSTRACT We analyzed the microhabitat preferences of Macrobrachium jelskii (Miers, 1877) males and females inhabiting an urban water reservoir in Cruz das Almas, Bahia, Brazil. Prawns were collected monthly, from March 2015 to February 2016, in three microhabitats, using a sieve. Each microhabitat was dominated by one macrophyte species: Eleocharis sp. (M1), Cabomba sp. (M2), and Nymphaea sp. (M3). The prawns were measured (carapace length), and categorized as juvenile males, adult males, juvenile females, non-ovigerous adult females and ovigerous adult females. An analysis of variance (ANOVA) was used to compare the number and size of individuals. The sex ratio and frequency of ovigerous females in the three microhabitats were also calculated. The sex ratio was biased towards females in M1 and did not deviate from 1:1 in M2 and M3. When prawns were separated into five categories we observed that non-ovigerous adult females were more abundant in M1, while adult males were the most abundant demographic category in M2 and M3. Juveniles of both sexes and ovigerous females showed no microhabitat preference, although M1 and M2 appeared to be more suitable for the latter. Adult females were the largest individuals in all microhabitats. Food availability, lower depth and lower predation pressure in M1 are the main factors that make M1 more suitable for M. jelskii, particularly non-ovigerous adult females and larger adult males. Intraspecific competition for shelter in M1 might also occur and adult females win this competition due to their larger body size. Therefore, adult males are found in higher abundance in M2 and M3 and the juvenile of both sexes spread evenly across all microhabitats. Our results help to understand the ecological role and the niche used by M. jelskii. Future studies on the habitat choice and predation under laboratory conditions should help to understand the behavior of this species.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227&lng=en&tlng=enMacrophytepopulation structurereproductionspatial distribution |
| spellingShingle | Jersei N. Silva Guilherme de Oliveira Sérgio S. da Rocha Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) Iheringia: Série Zoologia Macrophyte population structure reproduction spatial distribution |
| title | Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) |
| title_full | Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) |
| title_fullStr | Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) |
| title_full_unstemmed | Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) |
| title_short | Microhabitat preferences of the freshwater prawn Macrobrachium jelskii (Decapoda: Palaemonidae) |
| title_sort | microhabitat preferences of the freshwater prawn macrobrachium jelskii decapoda palaemonidae |
| topic | Macrophyte population structure reproduction spatial distribution |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212019000100227&lng=en&tlng=en |
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