caa a22 4500 445891556 CHVBK 20180317145618.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10750-011-0779-0 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0779-0 Using morphological characters of subfossil daphniid postabdominal claws to improve taxonomic resolution within species complexes [Elektronische Daten] [Jennifer Korosi, Adam Jeziorski, John Smol] Daphnia subfossils from lake sediments are useful for exploring the impacts of environmental stressors on aquatic ecosystems. Unfortunately, taxonomic resolution of Daphnia remains is coarse, as only a small portion of the animal is preserved, and so the identification of daphniid subfossils typically relies upon postabdominal claws. Daphniid claws can be assigned to one of two species complexes: D. longispina or D. pulex. Both complexes contain species with differing environmental optima, and therefore improved taxonomic resolution of subfossil daphniid claws would aid paleolimnological analyses. To identify morphological features that may be used to help differentiate between species within complexes, we used species presence/absence data from net tows to select lakes in central Ontario (Canada) containing only a single species from a particular complex, then used remains preserved in surface sediments of these lakes to isolate four Daphnia species: D.ambigua and D.mendotae from the D. longispina complex, and D. pulicaria and D. catawba from the D. pulex complex. Our analyses demonstrate that, within the D.longispina complex, postabdominal claw length (PCL) and spinule length can be used to distinguish D. mendotae from D. ambigua. In addition, within the D. pulex complex, there are differences between D. pulicaria and D. catawba in the relative lengths of the proximal and middle combs on the postabdominal claw. However, the number of stout spines on the middle comb is an unreliable character for differentiating species. Overall, our data demonstrate that greater resolution within Daphnia species complexes is possible using postabdominal claws; however, the process is arduous, and applicability will likely decrease with the number of taxa present. Springer Science+Business Media B.V., 2011 Daphnia nationallicence Paleolimnology nationallicence Species complexes nationallicence Identification guide nationallicence Postabdominal claws nationallicence Korosi Jennifer Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Jeziorski Adam Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Smol John Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut Hydrobiologia Springer Netherlands 676/1(2011-11-01), 117-128 0018-8158 676:1<117 2011 676 10750 https://doi.org/10.1007/s10750-011-0779-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0779-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Korosi Jennifer Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Jeziorski Adam Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 700 1- Smol John Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, K7L 3N6, Kingston, ON, Canada aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 676/1(2011-11-01), 117-128 0018-8158 676:1<117 2011 676 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer