ArticlePublisher preview available

Large branchiopod occurrence and community structure in relation to land-use types in temporary ponds of northern Tanzania

Authors:
To read the full-text of this research, you can request a copy directly from the authors.

Abstract and Figures

Large branchiopods are a key component of the fauna of temporary ponds and play an important role in the functioning of these vulnerable ecosystems. Owing to the establishment of new settlements and agricultural expansion, temporary ponds in Tanzania are disappearing at an alarming rate whilst little is known about their diversity and ecology. We contrasted temporary ponds from a protected area with those in communal lands to detect associations between land-use types and large branchiopod community structure. Six large branchiopod species were collected, five of which have been previously reported from Southern Africa, whilst one turned out to be new to science: Streptocephalus manyarensis n.sp. Kafula and Brendonck (2023). The clam shrimp Cyzicus sp., fairy shrimps Streptocephalus lamellifer Thiele (1900) and S. bourquinii Hamer and Appleton (1993) were the most abundant and widely occurring. Variation in large branchiopod community structure was explained by the presence of Nothobranchius killifish and orthophosphate concentration. The large branchiopod community structure was different in settlement and protected areas. Our study on the occurrence and structure of large branchiopod communities in relation to land-use types serves as a base for formulation of guidelines and management tools to regulate land-use practices adjacent to temporary pond ecosystems.
This content is subject to copyright. Terms and conditions apply.
Vol.: (0123456789)
1 3
Hydrobiologia
https://doi.org/10.1007/s10750-023-05141-6
HOMAGE TOHENRI DUMONT
Large branchiopod occurrence andcommunity structure
inrelation toland‑use types intemporary ponds ofnorthern
Tanzania
YusuphA.Kafula· GordianR.Mataba· GriteN.Mwaijengo· PieterLemmens· LinusK.Munishi·
FrancisMoyo· TrevorDube· BramVanschoenwinkel· LucBrendonck
Received: 21 July 2022 / Revised: 2 January 2023 / Accepted: 4 January 2023
© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023
Abstract Large branchiopods are a key component
of the fauna of temporary ponds and play an impor-
tant role in the functioning of these vulnerable eco-
systems. Owing to the establishment of new settle-
ments and agricultural expansion, temporary ponds in
Tanzania are disappearing at an alarming rate whilst
little is known about their diversity and ecology. We
contrasted temporary ponds from a protected area
with those in communal lands to detect associations
between land-use types and large branchiopod com-
munity structure. Six large branchiopod species were
collected, five of which have been previously reported
from Southern Africa, whilst one turned out to be new
to science: Streptocephalus manyarensis n.sp. Kafula
and Brendonck (2023). The clam shrimp Cyzicus
sp., fairy shrimps Streptocephalus lamellifer Thiele
(1900) and S. bourquinii Hamer and Appleton (1993)
were the most abundant and widely occurring. Vari-
ation in large branchiopod community structure was
explained by the presence of Nothobranchius killifish
and orthophosphate concentration. The large branchi-
opod community structure was different in settlement
and protected areas. Our study on the occurrence and
Handling editor: Dani Boix
Guest editor: Koen Martens / A Homage to Henri J.F.
Dumont, a Life in Science!
Supplementary Information The online version
contains supplementary material available at https:// doi.
org/ 10. 1007/ s10750- 023- 05141-6.
Y.A.Kafula(*)· L.Brendonck
Laboratory ofAnimal Ecology, Global Change
andSustainable Development, KU Leuven, Charles
Deberiotstraat 32, Box2439, 3000Leuven, Belgium
e-mail: arony@nm-aist.ac.tz
Y.A.Kafula· G.R.Mataba· L.K.Munishi· F.Moyo
Department ofSustainable Agriculture, Biodiversity
andEcosystem Management, School ofLife Sciences
andBio-Engineering, Nelson Mandela - African Institution
ofScience andTechnology, P. O Box447, Arusha,
Tanzania
Y.A.Kafula
Department ofAquatic Sciences, College ofAquatic
Sciences andFisheries, Mwalimu Julius K, Nyerere
University ofAgriculture andTechnology, P. O Box976,
Musoma, Tanzania
G.R.Mataba· G.N.Mwaijengo
School ofMaterials, Energy, Water andEnvironmental
Sciences, The Nelson Mandela African Institution
ofScience andTechnology, P. O. Box447, Arusha,
Tanzania
G.R.Mataba· B.Vanschoenwinkel
Community Ecology Laboratory, Vrije Universiteit
Brussel, Pleinlaan 2, 1050Brussels, Belgium
P.Lemmens
Leibniz Institute Für Gewasserökologie Und
Binnenfischerei (IGB), Müggelseedamm 310,
12587Berlin, Germany
Content courtesy of Springer Nature, terms of use apply. Rights reserved.
... Following this, Dalu and Wasserman [10] showed that macroinvertebrates are one of the most regularly employed biological indicators when assessing aquatic habitats, especially temporary pans. Despite being key indicators of ecological integrity and ecosystem health within wetland ecosystems macroinvertebrates are among the most vulnerable animals in aquatic ecosystems [27][28][29]. Aquatic macroinvertebrates are specialised to certain habitats, substrate types, temperatures, and dissolved oxygen concentrations, and can serve as indicators of disturbance [30]. ...
... A more robust approach might involve standardizing alpha diversity relative to sampling effort. For instance, Brendonck & Riddoch (1997) reported 20 species from 66 sites in Botswana, and Nhiwatiwa et al. (2014) 16 species from 36 sites in south-eastern Zimbabwe, whereas Kafula et al. (2023) identified six species from 33 sites in Tanzania. In South Africa, Dube et al. (2020) reported eight species from 38 sites in northern KwaZulu-Natal, while De Roeck et al. (2007) and Mabidi et al. (2016) reported 14 species from 22 sites and 13 species from 15 sites, respectively. ...
Article
We combined historical records from the literature (1950–2022) with recent field surveys and mesocosm-hatching assays conducted in 2018–2023 and found a total of thirty-two species of large branchiopods in Northern Cape province of South Africa, the largest absolute species richness reported in any area in southern Africa. This highlights this province as an important hotspot for large branchiopods, with six endemic species. Five new species (two anostracans and three spinicaudatans) described in the past six years from southern Africa were from the province. Moreover, our study identified four new species awaiting formal description, which not only enrich the overall diversity but also contribute significantly to the conservation value and functional roles within ephemeral waterbodies. Two new South Africa and province records, namely Leptestheria calcarata (Wolf in Daday, 1923) and a potentially undescribed species of PhallocryptusBirabén, 1951 were recorded. Based on the IUCN conservation assessment, three species are classified as critically endangered (CR), 14 as least concern (LC), and seven as data deficient (DD). It is now an opportune time to update the assessment given that the previous assessment of large branchiopods in southern Africa was conducted in the early 90s. This large-scale, province-wide study, taken together with historical records aims to contribute to our understanding of large branchiopods in the Northern Cape province of South Africa.
... In contrast, pelagic soft-bodied prey is likely to be more protected under turbid conditions. Presence of annual killifish in an ephemeral pool determines the invertebrate assemblage (Kafula et al., 2023;Pinceel et al., 2021). Therefore, water turbidity should be considered in further studies investigating killifish diet and the ecological effect of annual killifish on prey assemblages. ...
Article
Full-text available
Water turbidity alters prey detectability and prey selection by a predator. In dimorphic mesopredators, the effect of water turbidity on foraging success may be sex specific, primarily due to sex differences in reproductive allotment, body size and vulnerability to predation. To experimentally test the effect of turbidity on prey consumption with respect to sex, we used turquoise killifish ( Nothobranchius furzeri ), a small fish from ephemeral savanna pools in southeast Africa that vary widely in turbidity. Large males possess conspicuous nuptial coloration while females are smaller and drab. Vision is assumed to be a fundamental sense for turquoise killifish, despite often living in very turbid water. As mesopredators, killifish regulate the invertebrate community in ephemeral pools. We tested the consumption of bloodworms (benthic and red‐coloured) and glassworms (pelagic and transparent) under clear (<1NTU) and turbid (320 NTU) water conditions. We found that turquoise killifish maintained their overall foraging success irrespective of turbidity. In both the clear and turbid water, the females consumed three times more food than males relative to their body mass. This likely stems from the females' high nutritional demands due to daily reproduction. It also suggests that females are not risk‐aversive in clear water despite their smaller size. Water turbidity affected the type of prey consumed by turquoise killifish and demonstrated its potential to affect the community structure of invertebrate species in ephemeral pools.
Article
Full-text available
Globally, large branchiopod crustaceans such as brine shrimp, fairy shrimp, clam shrimp and tadpole shrimp are typical organisms of temporary waters. These macroscopic crustaceans can be highly abundant and reach a substantial biomass. While the brine shrimp (Artemia spp.), found in hypersaline wetland systems worldwide, is currently the only large branchiopod widely acknowledged as a food source for waterbirds, various single accounts in literature indicate that other large branchiopods could also be important prey. Recent research implies the role of large branchipods in supporting bird migration is larger than previously expected but it is unknown which birds might benefit the most. Summarising information from 68 papers, we found that at least 57 bird species consume large branchiopods. Herons and storks typically prey on tadpole shrimp while fairy shrimp and brine shrimp are eaten by ducks and waders. Overall, these records suggest that large branchiopods may be an underrecognised food source for waterbirds. This may be because they are not a well-known taxon and because they have become exceedingly rare in areas of the world where most wetland research takes place.
Article
Full-text available
It is conventionally understood that large branchiopod crustaceans are limited to temporary waters because they are sensitive to fish predation in permanent habitats (Kerfoot & Lynch, 1987; Brendonck et al., 2008). However, our field observations in February and March 2018, 2019 and 2020 showed that all major groups of large branchiopods (i.e. fairy‐, clam‐ and tadpole shrimps) co‐occur with killifish in temporary ponds across the savannah of southern Mozambique (Fig. 1A‐D; Appendix S1: Figure S1).
Article
Full-text available
We review the current knowledge surrounding the Triops granarius morphological species group globally, and present a revision of the southern African T. granarius forms based on collections from southern Africa and Madagascar. We also provide comparisons with other material of T. granarius from outside this region. We revise the morphological descriptions of T. numidicus (Grube, 1865) and T. namaquensis (Richters, 1886) using modern standards, and resurrect T. sakalavus Nobili, 1905 from synonymy, using both morphological and molecular techniques. Morphological definitions focus primarily on the form of the apical portion of the thoracopod II endite. Differential diagnoses are presented for the three species, including characters that separate them from the other members with similar morphology. Furthermore, we treat T. dybowskii (Braem, 1893), T. orientalis (Tiwari, 1951), and T. mavliensis (Tiwari, 1951), which had been recently resurrected, as species inquirenda.
Article
Full-text available
The ephemeral waterbodies of southern Africa are regarded a global hotspot for large Branchiopod diversity. Although the distributions and systematics of Anostraca and Notostraca have been fairly well defined, clam shrimps have received much less attention. So far, 18 clam shrimp species are known from the sub-region, but none of the available published literature defines their distribution in South Africa. Furthermore, most of the recent studies were concentrated in the mesic provinces, while very little information is available from the Northern Cape, where most ephemeral waterbodies in the country occur. This study reviews the distribution of clam shrimps in South Africa by reviewing published distribution records and contributing novel data from surveys in the Northern Cape. We found that 13 of the 18 species from the sub-region occur in South Africa, of which four are restricted to their respective provinces. We further clarify the current state of endemism patterns in South Africa and provide novel findings from the Northern Cape, including three new range extensions. The Northern Cape hosts the highest species richness, with nine species, followed by the Eastern Cape, where seven species have been recorded so far. Most other provinces have low species richness and endemism, while no species records have been published from the Limpopo province yet. Surveys over large geographical scales are important, and more research is needed on clam shrimp systematics in South Africa.
Article
Full-text available
Although temporary wetlands are often biodiversity hotspots that deliver multiple ecosystem services, they are also threatened by human exploitation. We conducted a comparative field study to investigate the impact of reserve protection on the diversity and community structure of aquatic macroinvertebrates of temporary wetlands (pans) in South Africa. Specifically, we compared the diversity and community composition of macroinvertebrates with a special focus on large branchiopod crustaceans in pans of a protected nature reserve (Ndumo Game Reserve) with that of pans in the surrounding anthropogenically disturbed area (Ndumo Communal Area). Our results show that reserve protection has a significant positive effect on the diversity and community structure of the aquatic macroinvertebrates. The taxon diversity for macroinvertebrates in general and large branchiopods in particular was significantly higher in the Ndumo Game Reserve, compared with the Ndumo Communal Area. Overall, our results illustrate the need for continued protection of reserve areas and pans in this tropical region in South Africa for the conservation of macroinvertebrate species.
Article
Full-text available
Multivariate statistics is a tool for examining the relationship of multiple variables simultaneously. Principal component analysis (PCA) is an unsupervised multivariate analysis technique that simplifies the complexity of data by transforming them in a few dimensions showing their trends and correlations. Interests in XLSTAT as statistical software program of choice for routine multivariate statistics has been growing due in part to its compatibility with Microsoft Excel data format. As a case of study, multivariate analysis is used to study the effects of unfiltered beer-based marination on the volatile terpenes and thiols, and sensory attributes of grilled ruminant meats. PCA was conducted to determine the correlations between the abundances of volatile terpenes and thiols and sensory attribute scores in marinated grilled meats, as well as to analyze if there was any clustering based on the type of meat and marination treatments employed. • XLSTAT PCA output successfully reduced the number of variables into 2 components that explained 90.47% of the total variation of the data set. • PCA clustered marinated and unmarinated meats based on the presence and abundances of volatile terpenes, thiols and consumer sensory attribute scores. • PCA could be applied to explore relationships between volatile compounds and sensory attributes in different food systems. Method name: The use of XLSTAT in conducting principal component analysis (PCA) when evaluating the relationships between sensory and quality attributes in grilled foods, Keywords: Grilled ruminant meat, Volatile metabolites, Unfiltered beer-based marinades, SPME-GC/MS, Sensory analysis, Principal component analysis
Chapter
Most large branchiopods inhabit endorheic waters that are of a temporary nature, atypical for the wet tropics but common in (semi)arid regions. Due to their ancient history and conserved morphology, they are often referred to as “living fossils.” Adapted to cope with intermittent droughts, large branchiopods produce long lived resting eggs that accumulate in a mixed egg bank in the sediment. During each inundation, part of the egg bank hatches into a new active community while the rest remains dormant to serve as a buffer for later recruitment. As large branchiopods can reach high biomass and span a variety of functional feeding groups, they are often key to ecosystem functioning. Yet, despite their importance, current knowledge of taxonomy, diversity, distribution, and ecology is limited. Research is complicated by substantial levels of cryptic diversity in most groups and taxonomic studies typically require the use of both morphological and molecular screening. The anostracan Parartemiidae only has members in one of the delineated biogeographical regions, while other families occur in two or more. However, genera are sometimes endemic to a limited area and species are typically very restricted in their geographic distribution. Several diversity hotspots for large branchiopods have been suggested in the subtropical climate zone, but these are probably more related to regional bias in research intensity rather than variation in ecological conditions. Still, high diversity is usually associated with pristine areas, illustrating the vulnerability of large branchiopods and their habitats to anthropogenic disturbance. Although large branchiopods cope well with the extensive natural environmental variation, many species are threatened because of habitat destruction, pollution, hydrological alteration, and climate change. Without proper conservation measures based on updated IUCN conservation goals, many more species may soon even no longer be considered as “living” fossils.
Article
Pesticides are crucial to improve agricultural productivity, but often adversely affect surrounding aquatic systems and their fauna. To determine the environmental risk of pesticides, routine ecotoxicological tests are performed on several organisms, including standard fish models. However, these typically do not include fish species from variable habitats and with non-generic life-histories. In particular, inhabitants from temporary ponds such as annual killifish are conventionally understood to be resilient to natural stressors which could translate to higher pesticide resistance or, alternatively, trade-off with their resistance to pesticides and render them more sensitive than classic fish models. Using standard exposure tests, we assessed short-term toxicity effects of two commonly used pesticides, Roundup and cypermethrin, on the annual killifish Nothobranchius neumanni, and compared its sensitivity with that of classic fish models. For Roundup, we found a 72 h-LC50 of 1.79 ± 0.11 mg/L, which is lower than the values reported for zebrafish, medaka, fathead minnow and rainbow trout, suggesting that N. neumanni is more sensitive to the compound. The opposite was true for cypermethrin, with a 72 h-LC50 of 0.27 ± 0.03 mg/L. However, these LC50-values do not deviate strongly from those reported for other fish species, supporting earlier findings in the congeneric N. furzeri that the sensitivity of annual killifish to pollutants is similar to that of classic fish models despite their assumed robustness to environmental stress.
Article
Wetlands have been declining worldwide, with an estimated 64–71% loss over the last century. Climate change is increasing pressure on wetlands, affecting their hydrology, and Mediterranean temporary ponds could be particularly vulnerable to these changes. We studied the expected changes in hydrology and plant community according to climatic change scenarios in 18 temporary ponds distributed in 6 areas along a latitudinal and climatic gradient in Morocco (750 km; 4° latitudinal gradient). Richness of pond species was significantly correlated with water level and pond hydroperiod and showed a strong decline from north to south along with increased water stress. Using the Mar-O-Sel software (mar-o-sel.net), we simulated the future evolution of water balance and wetland hydroperiod (duration and frequency of flooding) in these ponds for mid- and late-21st century. Climate projections were estimated based on 2 Representative Concentration Pathway (RCP) scenarios assuming a stabilization (RCP4.5) or increase (RCP8.5) in greenhouse gas emissions. The mean water deficit of the ponds currently ranges between −1380 and −1812 mm/yr and would increase by 16–67% in 2100 under the RCP8.5 scenarios. Pond richness is expected to decrease by 8–15 species in 2100, depending on area, as a result of shorter projected hydroperiods. Severity of change was not related to location of the ponds along the latitudinal (aridity) gradient, but rather to the interaction between the size of their catchment area and the thickness of the permeable soil layer.
Article
Mosquitoes and the diseases they transmit are a global public health threat that affects most human populations. Mosquito abundances are strongly linked to the number of suitable larval habitats available. However, it is still not well understood how different land uses impact larval habitat quality in different parts of the world. We investigated links between land use practices and abundance of mosquito larvae in temporary ponds located in different land uses in a malaria expansion zone in Tanzania. Temporary ponds are often cited as important sources of mosquitoes but are also of substantial conservation concern being home to a unique fauna and flora. Often, they also have high socio-economic importance. Overall, encountered mosquito larval abundances were very low, both for the collected Anopheles gambiae s.l. and Culex quinquefasciatus. Although temporary ponds are important mosquito larval habitats in other parts of Africa, currently they are unlikely to be an important factor affecting the prevalence of mosquito borne diseases in the Manyara study region. Larval abundances in temporary ponds were higher in agricultural areas where more eutrophic conditions were found and minimal in residential areas. Overall, even though temporary ponds are often modified as rice paddies in the rainy season, they were in a good ecological condition and hosted a diverse assemblage of aquatic predators that likely prevented larval mosquitoes from reaching high densities. Maintaining this good condition by preventing pesticide and nutrient input as much as possible, can be important to prevent pond degradation that is likely to make these habitats more suitable for mosquitoes in the future.
Article
Understanding the influence of land-use activities on river quality has been a key focus of river monitoring programs worldwide. However, defining which land-use spatial scale is relevant remains elusive. In this study, therefore, we contrasted the influence of land use on river quality using three types of land-use estimators, namely circular buffers around a monitoring site, circular buffers upstream of the monitoring site and the entire watershed area upstream of the monitoring site. The land-use percentage compositions within the Usa-Kikuletwa River catchment in northeastern Tanzania were quantified using Landsat-8 satellite images with a maximum mapping resolution of 30 m. Redundancy analysis models and generalized linear models were used to evaluate the influence of land use on macroinvertebrate assemblages and physico-chemical water quality at different spatial scales in the dry and wet seasons. Overall, a substantial fraction of variation in physico-chemical water quality, macroinvertebrate taxon richness, Chao-1 and TARISS (Tanzania River Scoring System) score could be explained by land use of the entire watershed area upstream of the monitoring site in the dry and wet seasons. However, macroinvertebrate abundances showed strong links with more local land-use patterns within 100 m and 2 km radii. Circular buffers upstream of monitoring sites were more informative for macroinvertebrate assemblages than circular buffers around the monitoring sites. However, the latter did correlate well with physico-chemical water quality variables. Land-use variables correlated across spatial scales (i.e., 100 m up to 2 km radii), but not with the land use in the entire watershed area above the monitoring site. Our results indicate that physico-chemical water quality variables and macroinvertebrates may respond differently to land-uses at different scales. More importantly, our results illustrate that the choice regarding spatial land-use metrics can bias conclusions of environmental impact studies in river systems.