Comparison of life history traits of Tanais dulongii (Tanaidacea: Tanaididae) in natural and artificial marine environments of the south-western Atlantic
© Springer-Verlag Berlin Heidelberg and AWI 2015
Received: 11 December 2014
Accepted: 14 April 2015
Published: 28 April 2015
Tanaidaceans are small benthic crustaceans with a strictly benthic life cycle and low dispersion rates, so they are good candidates to evaluate the effects of environment over life history strategies and reproductive biology. In this work, we studied two populations of Tanais dulongii (Audouin, 1826) that live in two contrasting habitats in order to determine whether they differ in life history traits. The animals were obtained by systematic sampling in a rocky shore with a lower anthropic impact (La Estafeta: LE) and a polluted area (Mar del Plata harbour: MdP) from March 2011 to March 2012. Seawater temperature and salinity did not differ between sites, but MdP showed more acid and hypoxic conditions than LE. Population density was homogeneous and lower in MdP (ca. 20 ind/100 gr) than that in LE where density varied between 250 and 800 ind/100 gr. Reproductive individuals and juveniles were always present, and both populations showed two main recruitment periods: the first in spring in both populations, and the second in summer in MdP but in autumn–winter in LE. In both populations, sex ratio was strongly female-biased. Juveniles, females and males from LE had larger sizes than that from MdP and reached their sexual differentiation at larger sizes. The estimated lifespan was about 9 and 12 months in MdP and LE, respectively. This study suggests that the differences observed between populations of T. dulongii in life history traits are intimately related to environmental differences in pH and dissolved oxygen between habitats, but should not be discarded a synergistic effect of temperature, organic pollution, food availability and predation pressure.
The study of life history traits of a species is essential to understand its population biology and their ecological role (Stearns 2000). Life history theory predicts that organisms should assign resources to growth, survival and reproduction in such a way as to maximize their reproductive success (Stearns 2000). When environmental conditions change, altering the fitness or subsistence, organisms may change their patterns of resource allocation (e.g. shifting their reproductive strategy, growth rates and behaviour) in order to continue maximizing their reproductive success (Schaffer 1974; Winkler and Wallin 1987; Duffy and Thiel 2007). In consequence, it is expected that populations of the same species exposed to dissimilar environmental conditions differ in their life history traits (Stearns 2000).
Tanaidaceans are represented by almost 1200 species, mostly marine, and distributed from littoral to hadal zones (Błażewicz-Paszkowycz et al. 2012) where they are the main food source for many organisms (Nagelkerken and Van der Velde 2004; Agüero et al. 2014). Their reproductive strategies and characteristics vary between species (Schram 1986; Błażewicz-Paszkowycz et al. 2012). In general, tanaidaceans are dioecious and present a sexual dimorphism or polymorphism (Schram 1986; Dojiri and Sieg 1997). In reproductive periods, males migrate actively searching ovigerous females, which in some cases are free living or remain hidden in shelters (e.g. tubes or burrows), and lay her eggs in a ventral marsupium after copulation (Johnson and Attramadal 1982a; Mendoza 1982; Schram 1986). Once fertilization occurs, offspring pass through an abbreviated larval development (manca I and II) (Masunari 1983; Messing 1983; Hamers and Franke 2000). When mancae are released, they begin to develop independently near to the mother (Johnson and Attramadal 1982a). Due to their small size (in most cases, around 3 mm or less) and a strictly benthic life cycle with low dispersion rates, life history traits are intimately related to environmental issues (Schram 1986; Dojiri and Sieg 1997), and therefore, tanaidaceans might be good candidates to evaluate the effects on environment over life history strategies.
Tanais dulongii (Audouin 1826) is a tanaidacean species with a worldwide distribution, their type locality is the Mediterranean Sea off Egypt, but it has also been recorded as native species in North Europe (Andersson et al. 1978; Johnson and Attramadal 1982a; Holdich and Jones 1983; Fiser 2004; Bamber, 2012). On the other hand, the presence of T. dulongii in ballast water and ship fouling has favoured its invasion in numerous regions of the world (Hutchings et al. 1993, Rander et al. 2009; Bamber, 2012; Błażewicz-Paszkowycz et al. 2012), such as Australia (Hutchings et al. 1993), eastern North America (Sieg 1980) and the coasts of south-western South America where the status is considered cryptogenic (i.e. a likely introduced organism) (Orensanz et al. 2002). According to Poore (1996), this wide distribution is highly suspect due to some tanaidaceans are superficially similar favouring a taxonomic misidentification, so most researchers are convinced that T. dulongii is a species complex consisting of several species morphologically similar as has been shown for many other tanaidaceans (Bamber, 2012; Larsen et al., 2014). However, this assertion has not been verified yet due to the lack of genetic studies.
Tanais dulongii lives in self-constructed tubes and feeds principally on detritus and algae, and it is commonly found in benthic environments of Argentina (Adami et al. 2004; Sueiro et al. 2011; Rumbold et al. 2012, 2014). Several aspects of the biology of this species have been studied, such as behaviour, development, reproduction, morphometry and population dynamics (Johnson and Attramadal 1982a, b; Borowsky 1983; Perez-Ruzafa and Sanz 1993; Hamers and Franke 2000; Rumbold et al. 2012, 2014, 2015), but interpopulational comparative studies are scarce (Pennafirme and Soares-Gomes 2009; Rumbold et al. 2014). Recent works have established that populations of T. dulongii that live in two contrasting habitats differed in morphometry and relative growth patterns (Rumbold et al. 2014), but differences in reproductive aspects (e.g. sex ratio and fecundity), population dynamics and lifespan have not been studied yet.
The aim of this paper was to examine and compare the populational and reproductive biology between two populations of T. dulongii that live in two dissimilar habitats: a natural rocky shore and an artificial harbour area. The working hypothesis is that populations that live under different environmental conditions will differ in life history traits.
Materials and methods
Field sampling and laboratory procedures
Samples were collected monthly from March 2011 to March 2012, except on June 2011 in LE due to bad weather conditions, and consist on five sampling units. The structure of both habitats is extremely different (two dimensions in LE, three dimensions in MdP), so a singly type of sampling unit was not possible. In LE, each sampling unit was defined by a 0.15 × 0.15 m quadrat placed over an algal patch; algae of this 0.0225 m2 quadrat were totally scraped up with spatulas. In MdP, each sampling unit was a mass of the fouling community adhered to docks extracted with a 830-cm3 core. Samples were fixed in situ in 98 % alcohol, and in the laboratory, they were sieved through a 0.35-mm mesh and weighed; organisms were sorted and counted using a stereomicroscope. Dissolved oxygen, pH and seawater temperature were measured in situ each time using a portable multiprobe instrument (HACH sensION 156), and salinity was measured with an optical refractometer.
Specimens of T. dulongii were sorted into five groups according to Almeida (1994) and Leite et al. (2003) on the basis of cheliped size and the presence of ovisacs (primordium of small brood sacs) or marsupia (developed brood sacs with eggs or embryos). The groups were males (with large chelipeds), pre-ovigerous females (with small chelipeds and ovisacs), ovigerous females (with small chelipeds and marsupium), post-ovigerous females (with small chelipeds but without ovisacs) and juveniles (all individuals measuring less than the smallest identifiable male, except those that had visible ovisacs). They were measured from the tip of the rostrum to the posterior edge of the pleotelson using a micrometric ocular on a stereoscopic microscope (total length, ±0.01 mm accuracy); the smallest identifiable male measured 2.81 mm in LE and 1.75 mm in MdP. Specimens were grouped in size classes of 0.25 mm, and size frequency distributions (SFD) were constructed for each population. Population density (individuals per 100 gr of sample) and sex ratio (males/(males + total females)) were calculated. The percentage of males and ovigerous females was used as an estimate of reproductive activity (Kneib 1992). Fecundity was estimated from 50 ovigerous females (with eggs at stage I) randomly selected; they were measured (total length), and their eggs removed from the marsupium and counted.
Parametric tests were used preferably, but when the assumptions of parametric statistics were seriously violated, an appropriate nonparametric test was applied (Underwood 1997). Statistical analyses were performed with the significance level set at P < 0.05.
To evaluate differences in environmental variables (factors: study sites and months), total density fluctuations (factors: study sites and months), variations in population groups (juveniles, males and females; factors: group and month) and to determine changes in female groups (pre-ovigerous, ovigerous and post-ovigerous; factors: group and month), a two-way ANOVA was used. A Student–Newman–Keuls (SNK) test was applied when statistically significant differences of means were found. A χ 2 test with Yates correction was applied to examine the deviation of sex ratio from an expected ratio of 1:1. Linear regression and determination coefficients were calculated for each population to assess the relationship between female size and the number of eggs in the marsupium; to determine the equality of regression lines, slopes and constants were tested by a Student’s t test. A Mann–Whitney U test was used to evaluate size differences in juveniles, females and males both between and within populations. Growth of T. dulongii was described by the seasonalized von Bertalanffy (VBGF) curve (see Bilgin et al. 2009 for details), and models were not fitted separately for each sex due to the low abundance of males in MdP. The growth curve was estimated by the Elefan I program (Pauly and David 1981).
Results of two-way ANOVA for comparison of environmental variables (temperature, salinity, pH and dissolved oxygen) between study sites and months sampled
Source of variation
Results of two-way ANOVA for comparison of densities: variation of total density between study sites and months; variation of population groups (males, females and juveniles) in La Estafeta and Mar del Plata harbour between months and groups; and variation of female groups (pre-ovigerous, ovigerous and post-ovigerous females) among months and groups
Source of variation
Study site × month
Mar del Plata harbour
Month × group
Month × group
Females MdP harbour
Month × group
Females La Estafeta
Month × group
The mean annual proportion of ovigerous females with respect to total females was 9.55 % in MdP. The maximum values of this proportion (>13 %) appeared in December 2011 and January 2012, and ovigerous females were absent during March, September and October 2011. On the contrary, ovigerous females were always present in LE with a mean annual proportion of 10.14 %, maximum values in November and December (>20 %) and minimum values in May and July (1.11–2.52 %).
Sex ratio, reproductive activity and fecundity
Environmental conditions showed that water has the same seasonal variation of temperature in both habitats, but it was more acid and hypoxic in MdP than in LE as previously reported (Rivero et al. 2005; Schwindt et al. 2010; Albano et al. 2013). No differences were observed in salinity between habitats except the extraordinary low value recorded in December in MdP (related to heavy rainfall; Martos et al. 2004); that fact suggests short-term variations of salinity in this site. Consequently, T. dulongii should face a priori more stressful conditions in MdP than those in LE, which would explain some differences observed in life history traits between populations, as reported before (Rumbold et al. 2014) and in this study.
A close relationship between density and temperature, characterized by the lowest values in warmer months and the highest in colder months, was observed in LE, but not in MdP with a lower but constant density through the year. The pattern observed in LE has been reported in other tanaidaceans (Mendoza 1982; Masunari 1983; Kneib 1992). Temperature plays a major role in intertidal environments: during the warm season, higher temperatures increase mortality rates of benthic species by desiccation, while in cold season lower temperatures reduce the desiccation and consequently mortality (Kneib 1984; Bertness 1999). This would explain not only the changes in abundance in LE, but also, in conjunction with the high reproductive activity recorded in previous months, the main recruitment registered in autumn and winter. Other factors may explain the low density recorded in MdP during the study period: it was demonstrated that larval and juvenile stages have high mortality rates related to adverse environmental conditions, such as sudden changes in salinity, low pH and dissolved oxygen, and high concentrations of organic matter (Stoner 1986; Chintiroglou et al. 2004; Kalkan et al. 2007; de la Ossa Carretero et al. 2010). Moreover, temperature influences reproduction of other peracarids as amphipods, isopods and mysids: higher temperatures promote juvenile growth and sexual maturation (Pöckl 1992; McKenney and Celestial 1995; Maranhão and Marques 2003; Fockedey et al. 2005; Tsoi et al. 2005; Henninger et al. 2010; Hosono 2011). A similar pattern has also been reported in populations of T. dulongii from Norway and Spain (Johnson and Attramadal 1982a; Perez-Ruzafa and Sanz 1993) and may explain the higher reproductive activity recorded during the warmer months in both populations.
Egg number was linearly related to female size in both populations and was similar to those reported in other tanaidacean species by Larsen (2005) but was higher than the values registered by other authors (Masunari and Sieg 1980; Masunari 1983; Messing 1983; Schmidt et al. 2002). However, the mean number of eggs per female and the slopes of fecundity regressions from MdP were lower than those from LE. As mentioned above, the stressful conditions of an environment may involve the shifting of resources from reproduction to survival (Stearns 2000), which would explain the observed variations in fecundity among populations. In peracarids, fecundity can be affected by many factors, such as pollutants, food availability, latitude, salinity and temperature (Corey 1981; France 1992; Maranhão and Marques 2003; Ford et al. 2004; Pennafirme and Soares-Gommes 2009). The results of this study are inconclusive to determine whether there is an effect of the environment on fecundity due to the difference in size range of ovigerous females of both populations.
Tanais dulongii had smaller sizes and reached sexual maturity earlier in MdP than in LE, as has been previously reported (Rumbold et al. 2014), but a higher growth rate and a shorter lifespan were found in the former site in this study. Similar differences between polluted and pristine environments were detected in the tanaidacean Apseudopsis latreillii (Milne-Edwards 1828) (de la Ossa Carretero et al. 2010). Several factors that affect growth and size characterize polluted sites as MDP: low oxygen content, low pH and high organic matter content. Oxygen availability influences size among and within amphipod species (e.g. Nebeker et al. 1992; Chapelle and Peck 2004). Low pH, synergically with low salinity, retarded the embryonic development of Echinogammarus marinus (Leach 1815) and later affected life history traits such as growth, maturity and reproduction (Egilsdottir et al. 2009). Moreover, environmental factors related to very nature of the habitat should not be discarded, such as food availability and predation pressure (Stearns 2000). Food resources are one of the main factors involved in growth and sexual maturation of crustaceans (Wenner et al. 1974; Hines 1989; Moore and Farrar 1996; Castiglioni et al. 2007; Cuzon et al. 2008). However, a higher organic matter content could favour maturity at smaller sizes, as occur in several peracarid populations where under stressful conditions invest more energy in reproduction than growth (Clarke 1987; Lozoya and Defeo 2006). On the other hand, it has been suggested that in populations of other crustaceans (e.g. crabs, shrimps and amphipods) that reach adulthood at relatively smaller sizes, predation pressure is higher on larger organisms, allowing to reach maturity at younger age, and consequently at smaller size, and to reproduce before being killed. This hypothesis implies that natural factors may explain the increase in the presence of this phenotype (small size) in the population (Wellborn 1994; Schlining and Spratt 2000; Zhang et al. 2004). Unfortunately, the effects of pollutants, environmental variables on development of T. dulongii and data of potential predators in both environments are lacking, so the explanation of the proximal causes of the observed differences would require more studies and detailed laboratory and field experiments.
In both populations, the maximum size corresponded to females (Rumbold et al. 2014; this study). Differences in body sizes between sexes should be related to the fact that the development is more complex and compromise more instars in females than in males (Hamers and Franke 2000). Furthermore, as mentioned above, larger sizes would favour an increase in fecundity and fitness in females (Rumbold et al. 2012), while smaller sizes in males may provide them a greater mobility, increasing the number of mates and reducing the risks of predation (Johnson and Attramadal 1982b; Borowsky 1983; Kakui 2015).
Two main recruitment periods were observed in T. dulongii, as occurs in Monokalliapseudes schubarti (Mañé-Garzón 1949), another intertidal tanaidacean of south-western Atlantic (Fonseca and D’Incao 2003; Leite et al. 2003) and in other benthic invertebrates of the study area, such as the amphipods Monocorophium acherusicum and Melita palmata, the decapod Cyrtograpsus angulatus and the polychaete Ficopomatus enigmaticus (Gavio 2003; Obenat 2002; Obenat et al. 2006; Ruíz Barlett 2012). Individuals recruited in late spring grew quickly in MdP and matured at reduced sizes in midsummer, while in LE juveniles recruited in spring grew more slowly and matured in late summer at larger sizes. Later, individuals of both populations continued growing and reproducing during autumn and winter until they disappeared in early or mid-spring when maximum sizes of adults and a decrease in density were observed, suggesting a high mortality of larger individuals. However, a second group of individuals that recruited in summer in MdP and autumn in LE could survive the colder months and growth in the following spring and even summer, reaching the largest sizes in both populations. Although both populations showed their first recruitment during spring, the second one differed between them, and this could be explained by the observed differences in growth rates. The estimated lifespan was about 9 and 12 months in MdP and LE, respectively. Moreover, SFD showed that MdP population is less structured than LE. This fact, combined with the abrupt increase of juveniles and females in MdP during January and March and the fact that ovigerous females were always present in LE but not in MdP, would suggest that MdP acts as a sink of recruits and possibly females from natural habitats. However, the small size of adults and the absence of planktonic stages in T. dulongii (Johnson and Attramadal 1982a, b; Hamers and Franke 2000), the presence of soft-bottom beaches on the sides of the harbour that grant certain isolation from nearby natural and artificial environments and the strong littoral current in the harbour entrance (Isla 2004; Martos et al. 2004; Rivero et al. 2005) would make very difficult the arrival of individuals from LE.
Finally, the presence of T. dulongii in MdP throughout the study period and their low density suggest that this species is tolerant to organic pollution and physical disturbance, confirming the idea of Kalkan et al. (2007). In addition, Ward and Hutchings (1996) found a population of T. dulongii in environments with high concentrations of heavy metals. However, studies related to the effects of pollutants on this species are lacking (Kalkan et al. 2007). This study together with future bio-assays (e.g. Ambrosio et al. 2014) could reveal the potential of T. dulongii as a bio-indicator species to assess the health status of marine environments.
The present study suggests that the differences observed between populations of T. dulongii, in life history traits, such as density, recruitment period, sizes and growth rates are intimately related to environmental differences between habitats. Further research is necessary to elucidate if population dynamics, reproductive aspects (present study) and morphometric differences (Rumbold et al. 2014) could be related with genetic and reproductive isolation between populations.
The authors would like to thank to Club Náutico de Mar del Plata to facilitate the access to the harbour. This paper was funded by Grants from the Universidad Nacional de Mar del Plata (EXA 610/12, EXA705/14) and from the Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina (CONICET) (PIP 112-201101-00830). C.E. Rumbold has a graduate fellowship from CONICET, and the results of this study will be part of his doctoral dissertation. Three anonymous referees provided useful comments which contributed to improve the final version of the manuscript.
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