On the origin of Antarctic marine benthic community structure

Thatje, Sven; Hillenbrand, Claus‐Dieter; Larter, Robert D

doi:10.1016/j.tree.2005.07.010

Cited by 250 publications

(287 citation statements)

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“…In addition, a correlation of changes in egg energy contents and temperature was observed along latitude as well as in subsequent ovipositions in the same female (Fischer and Thatje 2008;Fischer et al 2009a). These Wndings are consistent with the concept of a latitudinal gradient in energy provisioning into oVspring of a broad variety of marine invertebrates (for review see Thatje et al 2005). The underlying pattern of larger eggs with better energy provisioning at colder temperatures (higher latitudes) is discussed to be an adaptive response to limited food supply and longer pelagic life stage phases (Thatje et al 2005).…”

Section: Introductionsupporting

confidence: 84%

“…These Wndings are consistent with the concept of a latitudinal gradient in energy provisioning into oVspring of a broad variety of marine invertebrates (for review see Thatje et al 2005). The underlying pattern of larger eggs with better energy provisioning at colder temperatures (higher latitudes) is discussed to be an adaptive response to limited food supply and longer pelagic life stage phases (Thatje et al 2005). The latitudinal cline in energy provisioning of eggs therewith corresponds with the energy demand of the embryo.…”

Section: Introductionsupporting

confidence: 79%

“…Fischer et al (2009b) found more energy rich fatty acids in the southern than in the northern population eggs, independent of the incubation temperature. This might indicate a genetic adaptation to colder temperatures and might be a selection in the direction of non-feeding larvae and hence towards lecithotrophic development, which is indicating the beginning of an abbreviated development (Thatje et al 2005). It is widely accepted, that a development with many larval stages represents a phylogenetically ancestral state, while an abbreviation of the larval stage is said to be derived (Strathmann 1978;Anger 2001).…”

Section: Discussionmentioning

confidence: 99%

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Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

2009

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Phenotypic plasticity is an important but often ignored ability that enables organisms, within species-speciWc physiological limits, to respond to gradual or sudden extrinsic changes in their environment. In the marine realm, the early ontogeny of decapod crustaceans is among the best known examples to demonstrate a temperature-dependent phenotypic response. Here, we present morphometric results of larvae of the hairy crab Cancer setosus, the embryonic development of which took place at diVerent temperatures at two diVerent sites (Antofagasta, 23°45Ј S; Puerto Montt, 41°44Ј S) along the Chilean Coast. Zoea I larvae from Puerto Montt were signiWcantly larger than those from Antofagasta, when considering embryonic development at the same temperature. Larvae from Puerto Montt reared at 12 and 16°C did not diVer morphometrically, but sizes of larvae from Antofagasta kept at 16 and 20°C did, being larger at the colder temperature. Zoea II larvae reared in Antofagasta at three temperatures (16, 20, and 24°C) showed the same pattern, with larger larvae at colder temperatures. Furthermore, larvae reared at 24°C, showed deformations, suggesting that 24°C, which coincides with temperatures found during strong EL Niño events, is indicative of the upper larval thermal tolerance limit. C. setosus is exposed to a wide temperature range across its distribution range of about 40° of latitude. Phenotypic plasticity in larval oVspring does furthermore enable this species to locally respond to the inter-decadal warming induced by El Niño. Morphological plasticity in this species does support previously reported energetic trade-oVs with temperature throughout early ontogeny of this species, indicating that plasticity may be a key to a species' success to occupy a wide distribution range and/or to thrive under highly variable habitat conditions.

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Section: Introductionsupporting

confidence: 84%

Section: Introductionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

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Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

2009

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“…Assuming similar molecular clock rates, both have likely taken place in the same period (Plio-/Pleistocene) characterized by drastic environmental changes between glacial and interglacial periods (see Thatje et al, 2005;Allcock and Strugnell, 2012). Yet, whereas for C. megalonyx hybridization of many of the species has been detected, this is not the case for P. patagonica s.l.…”

Section: Comparing Species Complexes Of P Patagonica and C Megalonyxmentioning

confidence: 99%

“…In this context, molecular data have led to a paradigm shift: Most of the cryptic species have rendered the distribution ranges of formerly described species from broad (i.e., circum-Antarctic) to small and allopatric (Lörz et al, 2009;Held, 2014). As the timing of many of these divergence events was rather recent in the Plio-or Pleistocene (see Convey et al, 2009 for a review), an influence of the recurrent large-scale glaciations in these periods has been suggested as a main driver fueling the diversity pump, mainly through random genetic drift and lineage sorting in independent glacial refugia (Thatje et al, 2005(Thatje et al, , 2008Allcock and Strugnell, 2012). Prominent signatures of population bottlenecks, in particular for shallow-water organisms, have supported that view (e.g., Janko et al, 2007;Raupach et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Nuclear and Mitochondrial Gene Data Support Recent Radiation within the Sea Spider Species Complex Pallenopsis patagonica

et al. 2017

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The climate history of the Antarctic continental shelf has formed a diverse benthic ecosystem over evolutionary time scales. The extent of faunal diversity has only recently been unveiled especially by using genetic data. In addition to newly reported species, known species of benthic invertebrates in the Southern Ocean turned out to be in fact species complexes representing genetically very distinct clades. Previous studies have shown that the sea spider Pallenopsis patagonica is such a species complex consisting of several divergent mitochondrial clades. However, genetic analyses of another sea spider complex, Colossendeis megalonyx, showed that looking at one mitochondrial gene only can lead to overestimation of species number within a species complex and revealed mito-nuclear discordances. In this study we expand the current data set of P. patagonica by adding not only samples from Patagonia, the Subantarctic and the Eastern Weddell Sea, but also sequence data for the nuclear internal transcribed spacer (ITS) region to obtain more information about the species complex. In fact, the number of distinct clades is reduced when looking at nuclear data, but there are no cases of mito-nuclear discordance and hence no evidence for hybridization and speciation reversal events between divergent mitochondrial clades as in C. megalonyx. As patterns of mitochondrial COI diversity and divergence within P. patagonica and C. megalonyx are very similar and molecular dating analyses of both species complexes suggest a recent separation of clades during the Pleistocene, different biological processes seem to have led to fast and stable species boundaries in P. patagonica as opposed to C. megalonyx where hybridization even across major mitochondrial lineages occured.

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Evolution and Biodiversity of Antarctic Organisms

Rogers¹

2012

Antarctic Ecosystems

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On the origin of Antarctic marine benthic community structure

Cited by 250 publications

References 50 publications

Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

Temperature effects on zoeal morphometric traits and intraspecific variability in the hairy crab Cancer setosus across latitude

Nuclear and Mitochondrial Gene Data Support Recent Radiation within the Sea Spider Species Complex Pallenopsis patagonica

Evolution and Biodiversity of Antarctic Organisms

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